/* ── RESET & BASE ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --blue: #1a4de8;
  --blue-dark: #0f2d8c;
  --purple: #7a3aee;
  --gold: #c49a20;
  --green-bg: #0d3318;
  --green-text: #b8f7b0;
  --red-bg: #450a0a;
  --red-text: #fca5a5;
  --card-bg: #f7f6f2;
  --card-border: #e4e0d8;
  --body-bg: #faf9f6;
  --text: #1a1714;
  --text-secondary: #7a7470;
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
  --font-body: 'Lora', Georgia, serif;
  --radius: 14px;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.14);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --transition-base: 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.14s cubic-bezier(0.16, 1, 0.3, 1);
}
[data-theme="dark"] {
  --card-bg: #1e1c1a; --card-border: #2e2b28; --body-bg: #141210;
  --text: #f0ece6; --text-secondary: #8a847e;
  --shadow: 0 4px 24px rgba(0,0,0,0.3); --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
}

/* ── OCEAN THEME ── */
[data-theme="ocean"] {
  --blue: #0077b6; --blue-dark: #005f8a; --purple: #0096c7;
  --card-bg: #e8f4f8; --card-border: #b8dce8; --body-bg: #f0f8fc;
  --text: #03045e; --text-secondary: #0077b6;
  --shadow: 0 4px 24px rgba(0,119,182,0.1); --shadow-lg: 0 8px 40px rgba(0,119,182,0.18);
}
[data-theme="ocean"] .unit-select-bg { background: linear-gradient(135deg, #03045e 0%, #0077b6 50%, #00b4d8 100%); }
[data-theme="ocean"] .unit-select-bg::before { background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(0,180,216,0.4) 0%, transparent 60%), radial-gradient(ellipse 50% 40% at 90% 90%, rgba(0,119,182,0.3) 0%, transparent 50%); }
[data-theme="ocean"] .tab-btn.active { background: #0077b6; }
[data-theme="ocean"] .next-btn, [data-theme="ocean"] .dino-start-btn { background: #0077b6; }
[data-theme="ocean"] .next-btn:hover, [data-theme="ocean"] .dino-start-btn:hover { background: #005f8a; }
[data-theme="ocean"] .progress-bar-fill { background: linear-gradient(90deg, #0077b6, #00b4d8); }
[data-theme="ocean"] .tagline { color: #48cae4; }

/* ── FOREST THEME ── */
[data-theme="forest"] {
  --blue: #2d6a4f; --blue-dark: #1b4332; --purple: #52b788;
  --card-bg: #f0f7f0; --card-border: #c8e6c9; --body-bg: #f5faf5;
  --text: #1b4332; --text-secondary: #40916c;
  --shadow: 0 4px 24px rgba(45,106,79,0.1); --shadow-lg: 0 8px 40px rgba(45,106,79,0.18);
}
[data-theme="forest"] .unit-select-bg { background: linear-gradient(135deg, #081c15 0%, #1b4332 45%, #2d6a4f 100%); }
[data-theme="forest"] .unit-select-bg::before { background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(82,183,136,0.35) 0%, transparent 60%), radial-gradient(ellipse 50% 40% at 90% 90%, rgba(45,106,79,0.25) 0%, transparent 50%); }
[data-theme="forest"] .tab-btn.active { background: #2d6a4f; }
[data-theme="forest"] .next-btn, [data-theme="forest"] .dino-start-btn { background: #2d6a4f; }
[data-theme="forest"] .next-btn:hover, [data-theme="forest"] .dino-start-btn:hover { background: #1b4332; }
[data-theme="forest"] .progress-bar-fill { background: linear-gradient(90deg, #2d6a4f, #52b788); }
[data-theme="forest"] .tagline { color: #95d5b2; }

/* ── SUNSET THEME ── */
[data-theme="sunset"] {
  --blue: #c9184a; --blue-dark: #a4133c; --purple: #ff4d6d;
  --card-bg: #fff0f3; --card-border: #ffb3c1; --body-bg: #fff5f7;
  --text: #590d22; --text-secondary: #c9184a;
  --shadow: 0 4px 24px rgba(201,24,74,0.1); --shadow-lg: 0 8px 40px rgba(201,24,74,0.18);
}
[data-theme="sunset"] .unit-select-bg { background: linear-gradient(135deg, #370617 0%, #9d0208 30%, #dc2f02 60%, #f48c06 100%); }
[data-theme="sunset"] .unit-select-bg::before { background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(244,140,6,0.4) 0%, transparent 60%), radial-gradient(ellipse 50% 40% at 90% 90%, rgba(201,24,74,0.3) 0%, transparent 50%); }
[data-theme="sunset"] .tab-btn.active { background: #c9184a; }
[data-theme="sunset"] .next-btn, [data-theme="sunset"] .dino-start-btn { background: #c9184a; }
[data-theme="sunset"] .next-btn:hover, [data-theme="sunset"] .dino-start-btn:hover { background: #a4133c; }
[data-theme="sunset"] .progress-bar-fill { background: linear-gradient(90deg, #c9184a, #f48c06); }
[data-theme="sunset"] .tagline { color: #ffba08; }

/* ── MIDNIGHT THEME ── */
[data-theme="midnight"] {
  --blue: #7b2fbe; --blue-dark: #5a189a; --purple: #9d4edd;
  --card-bg: #10002b; --card-border: #240046; --body-bg: #0a0015;
  --text: #e0aaff; --text-secondary: #c77dff;
  --shadow: 0 4px 24px rgba(123,47,190,0.3); --shadow-lg: 0 8px 40px rgba(123,47,190,0.5);
}
[data-theme="midnight"] .unit-select-bg { background: linear-gradient(135deg, #03001c 0%, #0a0015 40%, #10002b 100%); }
[data-theme="midnight"] .unit-select-bg::before { background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(157,78,221,0.45) 0%, transparent 60%), radial-gradient(ellipse 50% 40% at 90% 90%, rgba(123,47,190,0.3) 0%, transparent 50%); }
[data-theme="midnight"] .tab-btn.active { background: #7b2fbe; box-shadow: 0 2px 10px rgba(123,47,190,0.5); }
[data-theme="midnight"] .next-btn, [data-theme="midnight"] .dino-start-btn { background: #7b2fbe; }
[data-theme="midnight"] .next-btn:hover, [data-theme="midnight"] .dino-start-btn:hover { background: #5a189a; }
[data-theme="midnight"] .progress-bar-fill { background: linear-gradient(90deg, #7b2fbe, #c77dff); }
[data-theme="midnight"] .tagline { color: #c77dff; }
[data-theme="midnight"] .card-bg, [data-theme="midnight"] .word-display-card { background: #10002b; border-color: #240046; }
[data-theme="midnight"] body { background: var(--body-bg); color: var(--text); }

/* ── SAND THEME ── */
[data-theme="sand"] {
  --blue: #8b5e3c; --blue-dark: #6b4226; --purple: #b8860b;
  --card-bg: #fdf6e3; --card-border: #e8d5b0; --body-bg: #fefaf2;
  --text: #3d2b1f; --text-secondary: #8b6914;
  --shadow: 0 4px 24px rgba(139,94,60,0.1); --shadow-lg: 0 8px 40px rgba(139,94,60,0.18);
}
[data-theme="sand"] .unit-select-bg { background: linear-gradient(135deg, #3d2b1f 0%, #6b4226 40%, #c19a6b 100%); }
[data-theme="sand"] .unit-select-bg::before { background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(184,134,11,0.35) 0%, transparent 60%), radial-gradient(ellipse 50% 40% at 90% 90%, rgba(139,94,60,0.25) 0%, transparent 50%); }
[data-theme="sand"] .tab-btn.active { background: #8b5e3c; }
[data-theme="sand"] .next-btn, [data-theme="sand"] .dino-start-btn { background: #8b5e3c; }
[data-theme="sand"] .next-btn:hover, [data-theme="sand"] .dino-start-btn:hover { background: #6b4226; }
[data-theme="sand"] .progress-bar-fill { background: linear-gradient(90deg, #8b5e3c, #d4a853); }
[data-theme="sand"] .tagline { color: #d4a853; }
html { font-size: 16px; }
body { background: var(--body-bg); color: var(--text); font-family: var(--font-body); min-height: 100vh; overflow-x: hidden; transition: background 0.35s, color 0.35s; }
.screen { display: none; min-height: 100vh; }
.screen.active { display: block; }

/* ── UNIT SELECT ── */
.unit-select-bg { position: fixed; inset: 0; z-index: -1; background: linear-gradient(135deg, #0a0718 0%, #1a0a2e 40%, #0d1a3a 100%); }
.unit-select-bg::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(122,58,238,0.3) 0%, transparent 60%), radial-gradient(ellipse 50% 40% at 90% 90%, rgba(26,77,232,0.2) 0%, transparent 50%); animation: bgPulse 8s ease-in-out infinite alternate; }
@keyframes bgPulse { from { opacity: 0.7; } to { opacity: 1; } }
.unit-select-container { max-width: 520px; margin: 0 auto; padding: 60px 24px 80px; }
.unit-select-header { text-align: center; margin-bottom: 48px; animation: heroEntrance 0.7s cubic-bezier(0.16,1,0.3,1) both; }
@keyframes heroEntrance { from { opacity: 0; transform: translateY(-24px); } to { opacity: 1; transform: none; } }
.tagline { font-family: var(--font-mono); font-size: 10px; font-weight: 600; letter-spacing: 3px; color: #a78bfa; text-transform: uppercase; margin-bottom: 12px; }
.tagline.small { font-size: 9px; letter-spacing: 2px; color: var(--text-secondary); }
.logo { font-family: var(--font-serif); font-size: 56px; font-weight: 900; color: #fff; line-height: 1; margin-bottom: 10px; }
.unit-select-header .subtitle { font-family: var(--font-mono); font-size: 12px; color: rgba(255,255,255,0.4); }
.unit-cards { display: flex; flex-direction: column; gap: 16px; }
.unit-card { background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1); border-radius: 20px; padding: 24px; cursor: pointer; transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1), background 0.25s, border-color 0.25s, box-shadow 0.3s; backdrop-filter: blur(10px); animation: cardSlideIn 0.5s cubic-bezier(0.16,1,0.3,1) both; }
.unit-card:nth-child(1) { animation-delay: 0.05s; }
.unit-card:nth-child(2) { animation-delay: 0.12s; }
.unit-card:nth-child(3) { animation-delay: 0.19s; }
.unit-card:nth-child(4) { animation-delay: 0.26s; }
@keyframes cardSlideIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: none; } }
.unit-card:hover { transform: translateY(-4px) scale(1.01); background: rgba(255,255,255,0.1); box-shadow: 0 16px 48px rgba(0,0,0,0.3); }
.unit-card:active { transform: translateY(-1px) scale(0.995); }
.unit-card-top { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 12px; }
.unit-emoji { font-size: 40px; line-height: 1; transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1); }
.unit-card:hover .unit-emoji { transform: scale(1.15) rotate(-5deg); }
.unit-badge { font-family: var(--font-mono); font-size: 11px; font-weight: 600; padding: 4px 10px; border-radius: 8px; border: 1px solid currentColor; }
.unit-card h2 { font-family: var(--font-serif); font-size: 28px; font-weight: 700; color: #fff; margin-bottom: 6px; }
.unit-card p { font-family: var(--font-mono); font-size: 11px; color: rgba(255,255,255,0.4); margin-bottom: 16px; }
.unit-card-btn { display: inline-flex; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: 12px; font-weight: 600; color: #fff; padding: 8px 16px; border-radius: 10px; background: rgba(255,255,255,0.15); float: right; transition: gap 0.25s cubic-bezier(0.34,1.56,0.64,1); }
.unit-card:hover .unit-card-btn { gap: 10px; }

/* ── MAIN HEADER ── */
.main-header { display: flex; align-items: center; gap: 12px; padding: 16px 20px; background: var(--body-bg); border-bottom: 1px solid var(--card-border); position: sticky; top: 0; z-index: 50; transition: background 0.35s, border-color 0.35s; backdrop-filter: blur(12px); }
.back-btn, .settings-btn, .theme-toggle { width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--card-border); background: var(--card-bg); cursor: pointer; display: flex; align-items: center; justify-content: center; color: var(--text-secondary); flex-shrink: 0; font-size: 16px; transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.14s, border-color 0.14s, box-shadow 0.2s; }
.back-btn:hover, .settings-btn:hover, .theme-toggle:hover { background: var(--card-border); transform: scale(1.08); box-shadow: 0 2px 12px rgba(0,0,0,0.1); }
.back-btn:active, .settings-btn:active { transform: scale(0.93); }
.theme-toggle:active { transform: rotate(20deg) scale(0.9); }
.main-header-text { flex: 1; text-align: center; }
.main-unit-title { font-family: var(--font-serif); font-size: 22px; font-weight: 700; }
.main-word-count { font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary); }

/* ── DIFFICULTY BAR ── */
.difficulty-bar { display: flex; gap: 6px; padding: 10px 16px; overflow-x: auto; scrollbar-width: none; background: var(--body-bg); transition: background 0.35s; }
.difficulty-bar::-webkit-scrollbar { display: none; }
.diff-btn { display: flex; align-items: center; gap: 5px; white-space: nowrap; font-family: var(--font-mono); font-size: 11px; font-weight: 600; padding: 6px 12px; border-radius: 8px; border: none; cursor: pointer; background: var(--card-bg); color: var(--text-secondary); transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.2s, color 0.2s, box-shadow 0.2s; }
.diff-btn:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.diff-btn:active { transform: scale(0.95); }
.diff-btn.active { color: #fff; transform: none; }

/* ── TAB BAR ── */
.tab-bar-wrapper { padding: 0 16px 12px; background: var(--body-bg); border-bottom: 1px solid var(--card-border); transition: background 0.35s, border-color 0.35s; }
.tab-bar { display: flex; gap: 4px; background: var(--card-bg); border-radius: 12px; padding: 4px; overflow-x: auto; scrollbar-width: none; transition: background 0.35s; }
.tab-bar::-webkit-scrollbar { display: none; }
.tab-btn { white-space: nowrap; font-family: var(--font-mono); font-size: 11px; font-weight: 600; padding: 7px 12px; border-radius: 9px; border: none; cursor: pointer; background: transparent; color: var(--text-secondary); transition: transform 0.18s cubic-bezier(0.34,1.56,0.64,1), background 0.18s, color 0.18s, box-shadow 0.18s; }
.tab-btn:hover:not(.active) { background: rgba(0,0,0,0.05); transform: translateY(-1px); }
.tab-btn:active { transform: scale(0.93); }
.tab-btn.active { background: var(--blue); color: #fff; box-shadow: 0 2px 10px rgba(26,77,232,0.35); }

/* ── TAB CONTENT ── */
.tab-content { max-width: 640px; margin: 0 auto; padding: 20px 20px 80px; }

/* ── SHARED COMPONENTS ── */
.card { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: var(--radius); padding: 20px; transition: background 0.35s, border-color 0.35s; }
.score-row { display: flex; align-items: center; justify-content: space-between; font-family: var(--font-mono); font-size: 12px; color: var(--text-secondary); margin-bottom: 12px; }
.progress-bar-track { height: 6px; border-radius: 4px; background: var(--card-border); overflow: hidden; margin-bottom: 16px; transition: background 0.35s; }
.progress-bar-fill { height: 100%; border-radius: 4px; background: linear-gradient(90deg, var(--blue), var(--purple)); transition: width 0.5s cubic-bezier(0.16,1,0.3,1); }
.timer-bar-wrap { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.timer-track { flex: 1; height: 8px; border-radius: 4px; background: var(--card-border); overflow: hidden; transition: background 0.35s; }
.timer-fill { height: 100%; border-radius: 4px; transition: width 0.95s linear, background 0.6s; }
.timer-label { font-family: var(--font-mono); font-size: 12px; font-weight: 600; width: 36px; text-align: right; transition: color 0.4s; }
.word-display-card { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: var(--radius); padding: 20px; margin-bottom: 12px; transition: background 0.35s, border-color 0.35s; }
.prompt-label { font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary); margin-bottom: 6px; }
.big-word { font-family: var(--font-serif); font-size: 36px; font-weight: 700; line-height: 1.1; }
.big-word.gold { color: var(--gold); }
.pos-badge { display: inline-block; font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary); background: rgba(0,0,0,0.06); padding: 2px 8px; border-radius: 6px; margin-left: 8px; vertical-align: middle; transition: background 0.35s; }
[data-mode="dark"] .pos-badge { background: rgba(255,255,255,0.08); }
.def-text { font-family: var(--font-body); font-size: 15px; color: var(--text-secondary); line-height: 1.6; margin-top: 6px; }

/* Choices */
.choices { display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px; }
.choice-btn { width: 100%; text-align: left; padding: 14px 16px; border-radius: 12px; border: 1px solid var(--card-border); background: var(--card-bg); font-family: var(--font-body); font-size: 15px; color: var(--text); cursor: pointer; line-height: 1.4; transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.2s, border-color 0.2s, box-shadow 0.2s, color 0.2s; animation: choiceIn 0.3s cubic-bezier(0.16,1,0.3,1) both; }
.choice-btn:nth-child(1){animation-delay:0.02s} .choice-btn:nth-child(2){animation-delay:0.07s} .choice-btn:nth-child(3){animation-delay:0.12s} .choice-btn:nth-child(4){animation-delay:0.17s}
@keyframes choiceIn { from { opacity: 0; transform: translateX(-10px); } to { opacity: 1; transform: none; } }
.choice-btn:hover:not(:disabled) { border-color: var(--blue); background: rgba(26,77,232,0.05); transform: translateX(4px); box-shadow: 0 2px 12px rgba(26,77,232,0.12); }
.choice-btn:active:not(:disabled) { transform: scale(0.985); }
.choice-btn:disabled { cursor: default; }
.choice-btn.correct { background: var(--green-bg); border-color: #22c55e; color: var(--green-text); animation: correctPop 0.45s cubic-bezier(0.34,1.56,0.64,1); }
.choice-btn.wrong { background: var(--red-bg); border-color: #ef4444; color: var(--red-text); animation: wrongShake 0.4s cubic-bezier(0.16,1,0.3,1); }
@keyframes correctPop { 0%{transform:scale(1)} 40%{transform:scale(1.03)} 100%{transform:scale(1)} }
@keyframes wrongShake { 0%,100%{transform:translateX(0)} 20%{transform:translateX(-6px)} 40%{transform:translateX(5px)} 60%{transform:translateX(-4px)} 80%{transform:translateX(3px)} }

/* Next btn */
.next-btn { width: 100%; padding: 13px; border-radius: 12px; border: none; background: var(--blue); color: #fff; font-family: var(--font-mono); font-size: 13px; font-weight: 600; cursor: pointer; margin-top: 8px; transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.18s, box-shadow 0.2s; animation: nextBtnIn 0.3s cubic-bezier(0.34,1.56,0.64,1) both; }
@keyframes nextBtnIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.next-btn:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(26,77,232,0.35); }
.next-btn:active { transform: scale(0.97); box-shadow: none; }

/* Banners */
.timed-out-banner { display: flex; align-items: center; gap: 8px; padding: 12px 16px; background: rgba(249,115,22,0.12); border-radius: 12px; color: #f97316; font-family: var(--font-body); font-size: 14px; font-weight: 600; margin-bottom: 10px; animation: bannerIn 0.35s cubic-bezier(0.34,1.56,0.64,1); }
@keyframes bannerIn { from { opacity: 0; transform: scale(0.94) translateY(-6px); } to { opacity: 1; transform: none; } }

/* Score end */
.score-end { text-align: center; padding: 40px 0 20px; }
.score-end .big-emoji { font-size: 64px; margin-bottom: 12px; display: block; animation: emojiDrop 0.65s cubic-bezier(0.34,1.56,0.64,1) both; }
@keyframes emojiDrop { from { opacity: 0; transform: scale(0.3) translateY(-30px); } to { opacity: 1; transform: none; } }
.score-end .final-score { font-family: var(--font-serif); font-size: 52px; font-weight: 900; margin-bottom: 4px; animation: scoreCount 0.5s cubic-bezier(0.34,1.56,0.64,1) 0.15s both; }
@keyframes scoreCount { from { opacity: 0; transform: scale(0.7); } to { opacity: 1; transform: scale(1); } }
.score-end .best-tag { font-family: var(--font-mono); font-size: 13px; font-weight: 600; color: #eab308; margin-bottom: 4px; animation: fadeUp 0.4s cubic-bezier(0.16,1,0.3,1) 0.25s both; }
.score-end .best-line { font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary); margin-bottom: 8px; animation: fadeUp 0.4s cubic-bezier(0.16,1,0.3,1) 0.3s both; }
.score-end .msg { font-family: var(--font-body); font-size: 14px; color: var(--text-secondary); margin-bottom: 20px; animation: fadeUp 0.4s cubic-bezier(0.16,1,0.3,1) 0.35s both; }
.score-end .restart-btn { display: inline-block; padding: 12px 28px; border-radius: 12px; border: none; background: var(--blue); color: #fff; font-family: var(--font-mono); font-size: 13px; font-weight: 600; cursor: pointer; animation: fadeUp 0.4s cubic-bezier(0.16,1,0.3,1) 0.4s both; transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.18s, box-shadow 0.2s; }
.score-end .restart-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(26,77,232,0.35); }
.score-end .restart-btn:active { transform: scale(0.96); }

/* ── FLASHCARD ── */
.flashcard-wrap { perspective: 1400px; margin: 16px 0; filter: drop-shadow(0 8px 24px rgba(0,0,0,0.12)); transition: filter 0.3s; }
.flashcard-wrap:hover { filter: drop-shadow(0 12px 32px rgba(0,0,0,0.18)); }
.flashcard { width: 100%; height: 260px; cursor: pointer; transform-style: preserve-3d; transition: transform 0.6s cubic-bezier(0.25,1.2,0.5,1); position: relative; }
.flashcard.flipped { transform: rotateY(180deg); }
.card-face { position: absolute; inset: 0; border-radius: 20px; backface-visibility: hidden; display: flex; align-items: center; justify-content: center; }
.card-front { background: var(--card-bg); border: 1px solid var(--card-border); flex-direction: column; gap: 10px; transition: background 0.35s, border-color 0.35s; }
.card-back { background: linear-gradient(135deg, var(--blue), var(--purple)); transform: rotateY(180deg); padding: 28px; }
.card-back p { font-family: var(--font-body); font-size: 18px; color: #fff; text-align: center; line-height: 1.6; }
.reveal-hint { font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary); }
.flashcard-nav { display: flex; gap: 10px; justify-content: center; }
.fc-nav-btn { display: flex; align-items: center; gap: 6px; padding: 10px 20px; border-radius: 10px; border: 1px solid var(--card-border); background: var(--card-bg); font-family: var(--font-mono); font-size: 12px; font-weight: 600; cursor: pointer; color: var(--text-secondary); transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.14s, border-color 0.14s, box-shadow 0.2s; }
.fc-nav-btn:hover { background: var(--card-border); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.fc-nav-btn:active { transform: scale(0.93); }
.fc-nav-btn.primary { background: var(--blue); color: #fff; border-color: var(--blue); }
.fc-nav-btn.primary:hover { background: var(--blue-dark); box-shadow: 0 4px 14px rgba(26,77,232,0.35); }
.swipe-hint { font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary); text-align: center; margin-top: 8px; }

/* ── MATCH ── */
.match-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 12px; }
.match-tile { padding: 12px 10px; border-radius: 12px; border: 1px solid var(--card-border); background: var(--card-bg); cursor: pointer; text-align: center; font-family: var(--font-body); font-size: 13px; line-height: 1.4; min-height: 70px; display: flex; align-items: center; justify-content: center; transition: transform 0.22s cubic-bezier(0.34,1.56,0.64,1), background 0.2s, border-color 0.2s, box-shadow 0.2s, opacity 0.35s, color 0.2s; }
.match-tile.word { font-family: var(--font-serif); font-size: 15px; font-weight: 700; }
.match-tile:hover:not(.matched):not(.wrong):not(.selected) { border-color: var(--blue); background: rgba(26,77,232,0.05); transform: translateY(-3px) scale(1.02); box-shadow: 0 6px 20px rgba(26,77,232,0.15); }
.match-tile:active:not(.matched) { transform: scale(0.96); }
.match-tile.selected { background: var(--blue); color: #fff; border-color: var(--blue); transform: scale(1.04); box-shadow: 0 6px 24px rgba(26,77,232,0.4); animation: selectedPulse 0.3s cubic-bezier(0.34,1.56,0.64,1); }
@keyframes selectedPulse { 0%{transform:scale(1)} 60%{transform:scale(1.07)} 100%{transform:scale(1.04)} }
.match-tile.matched { background: var(--green-bg); border-color: #22c55e; color: var(--green-text); opacity: 0.5; animation: matchedFade 0.4s cubic-bezier(0.16,1,0.3,1) forwards; }
@keyframes matchedFade { 0%{transform:scale(1.04);opacity:1} 50%{transform:scale(1.07);opacity:0.8} 100%{transform:scale(1);opacity:0.5} }
.match-tile.wrong { background: var(--red-bg); border-color: #ef4444; color: var(--red-text); animation: wrongShake 0.4s cubic-bezier(0.16,1,0.3,1); }
.match-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; font-family: var(--font-mono); font-size: 12px; color: var(--text-secondary); }
.match-done { text-align: center; padding: 40px 0 20px; }
.match-done .big-emoji { font-size: 60px; margin-bottom: 12px; display: block; animation: emojiDrop 0.65s cubic-bezier(0.34,1.56,0.64,1); }
.match-done .time-display { font-family: var(--font-mono); font-size: 48px; font-weight: 600; animation: scoreCount 0.5s cubic-bezier(0.34,1.56,0.64,1) 0.15s both; }
.match-done .best-tag { font-family: var(--font-mono); font-size: 13px; font-weight: 600; color: #eab308; animation: fadeUp 0.4s cubic-bezier(0.16,1,0.3,1) 0.3s both; }

/* ── MEMORY ── */
.memory-header { display: flex; align-items: center; justify-content: space-between; font-family: var(--font-mono); font-size: 12px; color: var(--text-secondary); margin-bottom: 8px; }
.memory-done { text-align: center; padding: 40px 0 20px; }
.memory-done .big-emoji { font-size: 60px; margin-bottom: 12px; display: block; animation: emojiDrop 0.65s cubic-bezier(0.34,1.56,0.64,1); }
.memory-stats { display: flex; gap: 32px; justify-content: center; margin-bottom: 12px; }
.memory-stat-val { font-family: var(--font-mono); font-size: 32px; font-weight: 600; animation: scoreCount 0.5s cubic-bezier(0.34,1.56,0.64,1) 0.15s both; }
.memory-stat-label { font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary); }

/* ── SPELLING ── */
.spelling-input-row { display: flex; gap: 8px; margin-bottom: 10px; }
.spelling-input { flex: 1; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--card-border); background: var(--card-bg); font-family: var(--font-mono); font-size: 15px; color: var(--text); outline: none; transition: border-color 0.2s, box-shadow 0.2s, background 0.35s, color 0.35s; }
.spelling-input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(26,77,232,0.12); }
.spelling-submit { width: 48px; height: 48px; border-radius: 10px; border: none; background: var(--blue); color: #fff; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.18s, box-shadow 0.2s; }
.spelling-submit:hover { background: var(--blue-dark); transform: scale(1.08); box-shadow: 0 4px 14px rgba(26,77,232,0.35); }
.spelling-submit:active { transform: scale(0.92); }
.spelling-submit:disabled { opacity: 0.35; transform: none; }
.spelling-result-banner { padding: 12px 16px; border-radius: 12px; text-align: center; font-family: var(--font-body); font-size: 15px; font-weight: 600; margin-bottom: 10px; animation: bannerIn 0.35s cubic-bezier(0.34,1.56,0.64,1); }
.spelling-result-banner.correct { background: var(--green-bg); color: var(--green-text); }
.spelling-result-banner.wrong { background: var(--red-bg); color: var(--red-text); }
.letter-tiles { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 10px; }
.letter-tile { width: 32px; height: 38px; border-radius: 6px; display: flex; align-items: center; justify-content: center; background: rgba(26,77,232,0.6); color: #fff; font-family: var(--font-mono); font-size: 17px; font-weight: 700; animation: tileIn 0.2s cubic-bezier(0.34,1.56,0.64,1) both; }
@keyframes tileIn { from { opacity: 0; transform: scale(0.5) translateY(6px); } to { opacity: 1; transform: none; } }
.hint-row { display: flex; align-items: center; gap: 6px; padding: 8px 14px; background: rgba(234,179,8,0.1); border-radius: 8px; color: #eab308; font-family: var(--font-mono); font-size: 13px; margin-bottom: 10px; animation: bannerIn 0.3s cubic-bezier(0.34,1.56,0.64,1); }
.action-row { display: flex; gap: 8px; margin-top: 4px; }
.small-btn { display: flex; align-items: center; gap: 5px; padding: 9px 14px; border-radius: 10px; border: 1px solid var(--card-border); background: var(--card-bg); font-family: var(--font-mono); font-size: 12px; font-weight: 600; cursor: pointer; color: var(--text-secondary); transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.14s, box-shadow 0.2s, color 0.15s, border-color 0.15s; }
.small-btn:hover { background: var(--card-border); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.08); }
.small-btn:active { transform: scale(0.94); }
.small-btn.hint { color: #eab308; background: rgba(234,179,8,0.08); border-color: rgba(234,179,8,0.3); }

/* ── POS ── */
.pos-choice-btn { font-family: var(--font-body); font-size: 18px; font-weight: 600; width: 100%; padding: 16px; border-radius: 12px; border: 1px solid var(--card-border); background: var(--card-bg); cursor: pointer; margin-bottom: 8px; transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.2s, border-color 0.2s, box-shadow 0.2s, color 0.2s; animation: choiceIn 0.3s cubic-bezier(0.16,1,0.3,1) both; }
.pos-choice-btn:nth-child(1){animation-delay:0.02s} .pos-choice-btn:nth-child(2){animation-delay:0.07s} .pos-choice-btn:nth-child(3){animation-delay:0.12s} .pos-choice-btn:nth-child(4){animation-delay:0.17s}
.pos-choice-btn:hover:not(:disabled) { border-color: var(--blue); transform: translateX(4px); box-shadow: 0 2px 12px rgba(26,77,232,0.12); }
.pos-choice-btn:active:not(:disabled) { transform: scale(0.985); }
.pos-choice-btn.correct { background: var(--green-bg); border-color: #22c55e; color: var(--green-text); animation: correctPop 0.45s cubic-bezier(0.34,1.56,0.64,1); }
.pos-choice-btn.wrong { background: var(--red-bg); border-color: #ef4444; color: var(--red-text); animation: wrongShake 0.4s cubic-bezier(0.16,1,0.3,1); }

/* ── SYN/ANT ── */
.synant-header-card { border-radius: var(--radius); padding: 20px; margin-bottom: 12px; animation: slideDown 0.4s cubic-bezier(0.16,1,0.3,1) both; }
@keyframes slideDown { from { opacity: 0; transform: translateY(-12px); } to { opacity: 1; transform: none; } }
.synant-header-card.syn { background: #0d2040; }
.synant-header-card.ant { background: #3a0f0f; }
.synant-type { font-family: var(--font-mono); font-size: 12px; color: rgba(255,255,255,0.5); margin-bottom: 6px; }
.synant-word { font-family: var(--font-serif); font-size: 32px; font-weight: 700; color: #fff; }
.synant-pos { font-family: var(--font-mono); font-size: 12px; color: rgba(255,255,255,0.5); margin-left: 8px; }
.synant-def { font-family: var(--font-body); font-size: 13px; color: rgba(255,255,255,0.6); margin-top: 6px; line-height: 1.5; }
.synant-choice-btn { font-family: var(--font-body); font-size: 19px; font-weight: 600; width: 100%; padding: 16px; border-radius: 12px; border: 1px solid var(--card-border); background: var(--card-bg); cursor: pointer; margin-bottom: 8px; transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.2s, border-color 0.2s, box-shadow 0.2s, color 0.2s; animation: choiceIn 0.3s cubic-bezier(0.16,1,0.3,1) both; }
.synant-choice-btn:nth-child(1){animation-delay:0.05s} .synant-choice-btn:nth-child(2){animation-delay:0.1s} .synant-choice-btn:nth-child(3){animation-delay:0.15s} .synant-choice-btn:nth-child(4){animation-delay:0.2s}
.synant-choice-btn:hover:not(:disabled) { border-color: var(--blue); transform: translateX(4px); box-shadow: 0 2px 12px rgba(26,77,232,0.12); }
.synant-choice-btn:active:not(:disabled) { transform: scale(0.985); }
.synant-choice-btn.correct { background: var(--green-bg); border-color: #22c55e; color: var(--green-text); animation: correctPop 0.45s cubic-bezier(0.34,1.56,0.64,1); }
.synant-choice-btn.wrong { background: var(--red-bg); border-color: #ef4444; color: var(--red-text); animation: wrongShake 0.4s cubic-bezier(0.16,1,0.3,1); }
.not-enough { text-align: center; padding: 60px 0 20px; }
.not-enough .big-emoji { font-size: 60px; margin-bottom: 12px; }

/* ── JEOPARDY ── */
.jeopardy-score-bar { display: flex; align-items: center; justify-content: space-between; padding: 8px 4px; margin-bottom: 8px; }
.jeopardy-score { font-family: var(--font-mono); font-size: 18px; font-weight: 700; color: var(--gold); transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1); }
.jeopardy-progress { font-family: var(--font-mono); font-size: 12px; color: var(--text-secondary); }
.jeopardy-board { display: grid; grid-template-columns: repeat(5, 1fr); gap: 3px; overflow-x: auto; }
.jeopardy-cat-header { font-family: var(--font-mono); font-size: 9px; font-weight: 600; color: #fff; text-align: center; padding: 8px 4px; border-radius: 4px; height: 44px; display: flex; align-items: center; justify-content: center; line-height: 1.2; animation: catHeaderIn 0.4s cubic-bezier(0.16,1,0.3,1) both; }
.jeopardy-cat-header:nth-child(1){animation-delay:0s} .jeopardy-cat-header:nth-child(2){animation-delay:0.06s} .jeopardy-cat-header:nth-child(3){animation-delay:0.12s} .jeopardy-cat-header:nth-child(4){animation-delay:0.18s} .jeopardy-cat-header:nth-child(5){animation-delay:0.24s}
@keyframes catHeaderIn { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: none; } }
.jeopardy-cell { height: 56px; border-radius: 4px; border: 1px solid rgba(0,0,0,0.15); display: flex; align-items: center; justify-content: center; cursor: pointer; flex-direction: column; gap: 2px; transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), filter 0.15s, box-shadow 0.2s; }
.jeopardy-cell:hover:not(.answered) { filter: brightness(1.25); transform: scale(1.07) translateY(-2px); box-shadow: 0 6px 18px rgba(0,0,0,0.25); position: relative; z-index: 1; }
.jeopardy-cell:active:not(.answered) { transform: scale(0.95); }
.jeopardy-cell.answered { background: var(--card-bg) !important; border-color: var(--card-border) !important; cursor: default; transition: background 0.4s, border-color 0.4s; }
.jeopardy-cell .cell-val { font-family: var(--font-mono); font-size: 16px; font-weight: 700; color: var(--gold); transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1); }
.jeopardy-cell:hover:not(.answered) .cell-val { transform: scale(1.1); }
.jeopardy-cell .cell-dd { font-size: 10px; }
.jeopardy-cell .check-mark { font-size: 16px; animation: checkIn 0.4s cubic-bezier(0.34,1.56,0.64,1); }
@keyframes checkIn { from { opacity: 0; transform: scale(0.3) rotate(-20deg); } to { opacity: 1; transform: none; } }
.jeopardy-modal-bg { position: fixed; inset: 0; background: rgba(0,0,0,0.7); z-index: 100; display: flex; align-items: flex-end; justify-content: center; padding-bottom: 20px; }
.jeopardy-modal-bg.hidden { display: none; }
.jeopardy-modal { background: var(--body-bg); border-radius: 24px 24px 20px 20px; padding: 24px; width: 100%; max-width: 560px; max-height: 90vh; overflow-y: auto; box-shadow: var(--shadow-lg); animation: modalSlideUp 0.4s cubic-bezier(0.34,1.56,0.64,1); transition: background 0.35s; }
@keyframes modalSlideUp { from { opacity: 0; transform: translateY(60px) scale(0.96); } to { opacity: 1; transform: none; } }
.jq-top { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 16px; }
.jq-cat { font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary); }
.jq-val-row { display: flex; align-items: center; gap: 8px; margin-top: 2px; }
.jq-val { font-family: var(--font-mono); font-size: 22px; font-weight: 700; color: var(--gold); }
.jq-dd { font-family: var(--font-mono); font-size: 10px; font-weight: 700; color: #eab308; background: rgba(234,179,8,0.15); padding: 2px 8px; border-radius: 6px; }
.jq-done-btn { padding: 8px 16px; border-radius: 10px; border: none; background: var(--blue); color: #fff; font-family: var(--font-mono); font-size: 13px; font-weight: 600; cursor: pointer; transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.18s, box-shadow 0.2s; animation: fadeUp 0.3s cubic-bezier(0.34,1.56,0.64,1); }
.jq-done-btn:hover { transform: scale(1.05); box-shadow: 0 4px 14px rgba(26,77,232,0.35); }
.jq-done-btn:active { transform: scale(0.95); }
.jq-prompt { font-family: var(--font-body); font-size: 17px; color: var(--text); line-height: 1.5; padding: 16px; background: var(--card-bg); border-radius: 12px; text-align: center; margin-bottom: 14px; transition: background 0.35s, color 0.35s; animation: slideDown 0.35s cubic-bezier(0.16,1,0.3,1) 0.05s both; }
.jq-choices { display: flex; flex-direction: column; gap: 8px; }
.jq-choice { width: 100%; padding: 13px 16px; text-align: center; border-radius: 10px; border: 1px solid var(--card-border); background: var(--card-bg); font-family: var(--font-body); font-size: 16px; font-weight: 600; cursor: pointer; transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.2s, border-color 0.2s, box-shadow 0.2s, color 0.2s; animation: choiceIn 0.3s cubic-bezier(0.16,1,0.3,1) both; }
.jq-choice:nth-child(1){animation-delay:0.1s} .jq-choice:nth-child(2){animation-delay:0.15s} .jq-choice:nth-child(3){animation-delay:0.2s} .jq-choice:nth-child(4){animation-delay:0.25s}
.jq-choice.pos-style { font-family: var(--font-mono); font-size: 14px; }
.jq-choice:hover:not(:disabled) { border-color: var(--blue); transform: translateX(3px); box-shadow: 0 2px 10px rgba(26,77,232,0.12); }
.jq-choice:active:not(:disabled) { transform: scale(0.985); }
.jq-choice.correct { background: var(--green-bg); border-color: #22c55e; color: var(--green-text); animation: correctPop 0.45s cubic-bezier(0.34,1.56,0.64,1); }
.jq-choice.wrong { background: var(--red-bg); border-color: #ef4444; color: var(--red-text); animation: wrongShake 0.4s cubic-bezier(0.16,1,0.3,1); }
.jeopardy-done { text-align: center; padding: 40px 0 20px; }
.jeopardy-done .big-emoji { font-size: 60px; margin-bottom: 12px; display: block; animation: emojiDrop 0.65s cubic-bezier(0.34,1.56,0.64,1); }
.jeopardy-done .jp-score { font-family: var(--font-mono); font-size: 52px; font-weight: 700; color: var(--gold); animation: scoreCount 0.5s cubic-bezier(0.34,1.56,0.64,1) 0.15s both; }

/* ── BROWSE ── */
.browse-search-row { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; padding: 10px 14px; background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 12px; transition: background 0.35s, border-color 0.2s, box-shadow 0.2s; }
.browse-search-row:focus-within { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(26,77,232,0.1); }
.browse-search-row svg { color: var(--text-secondary); flex-shrink: 0; }
.browse-search { flex: 1; border: none; background: transparent; font-family: var(--font-mono); font-size: 13px; color: var(--text); outline: none; }
.word-rows { display: flex; flex-direction: column; gap: 6px; }
.word-row { display: flex; align-items: flex-start; gap: 12px; padding: 12px 14px; background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 12px; transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), box-shadow 0.2s, background 0.35s, border-color 0.35s; animation: wordRowIn 0.3s cubic-bezier(0.16,1,0.3,1) both; }
.word-row:hover { transform: translateX(4px); box-shadow: 0 2px 12px rgba(0,0,0,0.06); }
@keyframes wordRowIn { from { opacity: 0; transform: translateX(-8px); } to { opacity: 1; transform: none; } }
.word-row-left { min-width: 110px; }
.word-row-word { font-family: var(--font-serif); font-size: 16px; font-weight: 700; }
.word-row-pos { font-family: var(--font-mono); font-size: 10px; color: var(--text-secondary); }
.word-row-def { font-family: var(--font-body); font-size: 13px; color: var(--text-secondary); line-height: 1.5; flex: 1; }

/* ── MODAL / SETTINGS ── */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 200; display: flex; align-items: flex-end; justify-content: center; padding: 0; animation: overlayIn 0.25s cubic-bezier(0.16,1,0.3,1); }
@keyframes overlayIn { from { background: rgba(0,0,0,0); } to { background: rgba(0,0,0,0.5); } }
.modal-overlay.hidden { display: none; }
.modal { background: var(--body-bg); border-radius: 24px 24px 0 0; width: 100%; max-width: 640px; max-height: 85vh; overflow-y: auto; padding-bottom: 40px; animation: modalSlideUp 0.4s cubic-bezier(0.34,1.56,0.64,1); transition: background 0.35s; }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 20px 24px; border-bottom: 1px solid var(--card-border); position: sticky; top: 0; background: var(--body-bg); z-index: 1; transition: background 0.35s, border-color 0.35s; }
.lb-unit-select { font-family: var(--font-mono); font-size: 11px; font-weight: 600; padding: 4px 8px; border-radius: 8px; border: 1.5px solid var(--card-border); background: var(--card-bg); color: var(--text); cursor: pointer; outline: none; margin-left: auto; margin-right: 10px; }
.modal-header h2 { font-family: var(--font-serif); font-size: 22px; font-weight: 700; }
.modal-close { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 50%; width: 32px; height: 32px; cursor: pointer; font-size: 14px; display: flex; align-items: center; justify-content: center; transition: transform 0.25s cubic-bezier(0.34,1.56,0.64,1), background 0.14s; }
.modal-close:hover { transform: scale(1.1) rotate(90deg); background: var(--card-border); }
.modal-close:active { transform: scale(0.9); }
.modal-body { padding: 20px 24px; }
.settings-section { margin-bottom: 24px; }
.settings-section h3 { font-family: var(--font-mono); font-size: 11px; font-weight: 600; letter-spacing: 2px; text-transform: uppercase; color: var(--text-secondary); margin-bottom: 10px; }
.settings-row { display: flex; align-items: center; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid var(--card-border); font-family: var(--font-body); font-size: 14px; transition: border-color 0.35s; }
.settings-row:last-child { border-bottom: none; }
.settings-row-val { font-family: var(--font-mono); font-size: 12px; color: var(--text-secondary); }
.settings-btn-row { display: flex; gap: 8px; margin-top: 12px; }
.danger-btn { flex: 1; padding: 10px; border-radius: 10px; border: 1px solid #ef4444; background: rgba(239,68,68,0.08); color: #ef4444; font-family: var(--font-mono); font-size: 12px; font-weight: 600; cursor: pointer; transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.18s, box-shadow 0.2s; }
.danger-btn:hover { background: rgba(239,68,68,0.15); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(239,68,68,0.2); }
.danger-btn:active { transform: scale(0.96); }
.toggle-switch { position: relative; width: 44px; height: 24px; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider { position: absolute; cursor: pointer; inset: 0; background: var(--card-border); border-radius: 24px; transition: background 0.25s; }
.toggle-slider::before { content: ''; position: absolute; width: 18px; height: 18px; left: 3px; bottom: 3px; background: #fff; border-radius: 50%; transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1), box-shadow 0.2s; box-shadow: 0 1px 4px rgba(0,0,0,0.2); }
.toggle-switch input:checked + .toggle-slider { background: var(--blue); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(20px); }

/* ── ANNOUNCEMENT WIDGET ── */
.home-announcement {
  position: fixed; top: 20px; left: 20px; z-index: 20;
  max-width: 220px;
  background: rgba(122,58,238,0.22);
  border: 1px solid rgba(122,58,238,0.45);
  border-radius: 12px;
  padding: 9px 14px;
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  color: rgba(255,255,255,0.88);
  backdrop-filter: blur(10px);
  line-height: 1.45;
  animation: annPop 0.5s cubic-bezier(0.34,1.56,0.64,1) 0.4s both;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s, max-width 0.25s, padding 0.25s, border-radius 0.25s;
  display: flex; align-items: center; gap: 10px;
}
.home-announcement-text { flex: 1; }
.home-announcement-toggle {
  background: none; border: none; color: inherit; font-size: 11px; line-height: 1;
  cursor: pointer; opacity: 0.55; padding: 2px; flex-shrink: 0;
}
.home-announcement-toggle:hover { opacity: 1; }
.home-announcement.collapsed {
  max-width: none; width: 38px; height: 38px; padding: 0; border-radius: 50%;
  align-items: center; justify-content: center; font-size: 17px;
}
.home-announcement:hover {
  background: rgba(122,58,238,0.32);
  box-shadow: 0 4px 20px rgba(122,58,238,0.3);
}
@keyframes annPop {
  from { opacity: 0; transform: scale(0.85) translateY(-8px); }
  to   { opacity: 1; transform: none; }
}
@media (max-width: 480px) {
  .home-announcement { top: 12px; left: 12px; max-width: 160px; font-size: 10px; }
}

/* ── BOOK LOGO ── */
.logo-book {
  font-size: 72px; line-height: 1; margin-bottom: 8px; display: block;
  animation: heroEntrance 0.7s cubic-bezier(0.16,1,0.3,1) both;
  filter: drop-shadow(0 8px 24px rgba(122,58,238,0.4));
}

/* ── HOME LEADERBOARD BUTTON ── */
.home-actions {
  display: flex; gap: 10px; justify-content: center; flex-wrap: wrap;
  margin-top: 14px;
}
.home-lb-btn {
  margin-top: 0; padding: 10px 24px; border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.2); background: rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.85); font-family: var(--font-mono); font-size: 13px; font-weight: 600;
  cursor: pointer; backdrop-filter: blur(8px);
  transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.2s, box-shadow 0.2s;
  animation: heroEntrance 0.7s cubic-bezier(0.16,1,0.3,1) 0.2s both;
}
.home-lb-btn:hover { background: rgba(255,255,255,0.18); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.25); }
.home-lb-btn:active { transform: scale(0.96); }

/* ── LEADERBOARD SWITCHER ── */
.lb-switcher {
  display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px;
  padding-bottom: 14px; border-bottom: 1px solid var(--card-border);
}
.lb-switch-btn {
  padding: 5px 12px; border-radius: 8px; border: 1px solid var(--card-border);
  background: var(--card-bg); font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  color: var(--text-secondary); cursor: pointer;
  transition: transform 0.18s cubic-bezier(0.34,1.56,0.64,1), background 0.15s, color 0.15s, border-color 0.15s;
}
.lb-switch-btn:hover { transform: translateY(-1px); border-color: var(--blue); }
.lb-switch-btn.active { background: var(--blue); color: #fff; border-color: var(--blue); box-shadow: 0 2px 8px rgba(26,77,232,0.3); }

/* ── LEADERBOARD SUCCESS MSG ── */
.lb-success-msg {
  font-family: var(--font-mono); font-size: 13px; color: var(--green-text);
  background: var(--green-bg); border-radius: 8px; padding: 10px; text-align: center;
  animation: bannerIn 0.35s cubic-bezier(0.34,1.56,0.64,1);
}

/* ── LEADERBOARD SPINNER ── */
.lb-spinner {
  width: 32px; height: 32px; border-radius: 50%; margin: 0 auto;
  border: 3px solid var(--card-border);
  border-top-color: var(--blue);
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.lb-unit { font-family: var(--font-mono); font-size: 10px; color: var(--text-secondary); flex: 1; text-align: right; margin-right: 8px; }

/* ── FLASHCARD BACK CONTENT ── */
.card-back-content { display: flex; flex-direction: column; gap: 8px; align-items: center; padding: 0 24px; width: 100%; }
.card-back-content p { font-family: var(--font-body); font-size: 16px; color: #fff; text-align: center; line-height: 1.5; }
.fc-syn-ant { font-family: var(--font-mono); font-size: 11px; color: rgba(255,255,255,0.75); text-align: center; }
.fc-sa-label { font-weight: 700; font-size: 10px; padding: 1px 6px; border-radius: 4px; margin-right: 4px; }
.fc-sa-label.syn-label { background: rgba(34,197,94,0.3); color: #86efac; }
.fc-sa-label.ant-label { background: rgba(239,68,68,0.3); color: #fca5a5; }

/* ── BROWSE SYN/ANT ── */
.word-row-right { flex: 1; display: flex; flex-direction: column; gap: 4px; }
.browse-sa { font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary); display: flex; align-items: baseline; gap: 6px; }
.browse-sa-label { font-weight: 700; font-size: 10px; padding: 1px 6px; border-radius: 4px; flex-shrink: 0; }
.syn-row .browse-sa-label { background: rgba(34,197,94,0.15); color: #16a34a; }
.ant-row .browse-sa-label { background: rgba(239,68,68,0.12); color: #dc2626; }
[data-mode="dark"] .syn-row .browse-sa-label { background: rgba(34,197,94,0.2); color: #86efac; }
[data-mode="dark"] .ant-row .browse-sa-label { background: rgba(239,68,68,0.2); color: #fca5a5; }

/* ── LEADERBOARD ── */
.leaderboard-btn {
  display: inline-block; padding: 10px 22px; border-radius: 12px; border: 1px solid var(--card-border);
  background: var(--card-bg); color: var(--text); font-family: var(--font-mono);
  font-size: 12px; font-weight: 600; cursor: pointer; margin-top: 10px; margin-left: 8px;
  transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.15s, box-shadow 0.2s;
  animation: fadeUp 0.4s cubic-bezier(0.16,1,0.3,1) 0.45s both;
}
.leaderboard-btn:hover { transform: translateY(-2px); box-shadow: 0 4px 14px rgba(0,0,0,0.1); background: var(--card-border); }
.leaderboard-btn:active { transform: scale(0.96); }
.lb-list { display: flex; flex-direction: column; gap: 6px; }
.lb-row {
  display: flex; align-items: center; gap: 10px; padding: 10px 12px;
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 10px;
  transition: background 0.35s, border-color 0.35s;
  animation: choiceIn 0.3s cubic-bezier(0.16,1,0.3,1) both;
}
.lb-row.lb-top { border-color: var(--gold); background: rgba(196,154,32,0.06); }
.lb-rank { font-family: var(--font-mono); font-size: 13px; font-weight: 700; width: 28px; flex-shrink: 0; }
.lb-name-wrap { display: flex; flex-direction: column; flex: 1; min-width: 0; gap: 1px; }
.lb-name { font-family: var(--font-serif); font-size: 15px; font-weight: 600; }
.lb-date { font-family: var(--font-mono); font-size: 10px; color: var(--text-secondary); opacity: 0.75; }
.lb-score { font-family: var(--font-mono); font-size: 13px; font-weight: 700; color: var(--blue); flex-shrink: 0; }
.lb-row.lb-top .lb-score { color: var(--gold); }

/* ── NAME SUBMIT BOX ── */
.name-submit-box {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 14px;
  padding: 14px 16px; margin: 12px 0; text-align: left;
  animation: bannerIn 0.4s cubic-bezier(0.34,1.56,0.64,1);
  transition: background 0.35s, border-color 0.35s;
}
.name-submit-title { font-family: var(--font-mono); font-size: 12px; font-weight: 600; color: var(--text-secondary); margin-bottom: 10px; }
.name-submit-row { display: flex; gap: 8px; }
.name-input {
  flex: 1; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--card-border);
  background: var(--body-bg); font-family: var(--font-mono); font-size: 13px; color: var(--text);
  outline: none; transition: border-color 0.2s, box-shadow 0.2s, background 0.35s, color 0.35s;
}
.name-input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(26,77,232,0.12); }
.name-submit-btn {
  padding: 10px 16px; border-radius: 8px; border: none; background: var(--blue); color: #fff;
  font-family: var(--font-mono); font-size: 12px; font-weight: 600; cursor: pointer; flex-shrink: 0;
  transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.15s, box-shadow 0.2s;
}
.name-submit-btn:hover { background: var(--blue-dark); transform: scale(1.05); }
.name-submit-btn:active { transform: scale(0.95); }

/* ── JEOPARDY TYPE INPUT ── */
.jq-type-row { display: flex; gap: 8px; margin-bottom: 8px; }
.jq-type-input {
  flex: 1; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--card-border);
  background: var(--card-bg); font-family: var(--font-mono); font-size: 15px; color: var(--text);
  outline: none; transition: border-color 0.2s, box-shadow 0.2s, background 0.35s;
}
.jq-type-input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(26,77,232,0.12); }
.jq-type-submit {
  padding: 12px 18px; border-radius: 10px; border: none; background: var(--blue); color: #fff;
  font-family: var(--font-mono); font-size: 13px; font-weight: 600; cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.15s, box-shadow 0.2s;
}
.jq-type-submit:hover { background: var(--blue-dark); transform: scale(1.04); box-shadow: 0 4px 14px rgba(26,77,232,0.35); }
.jq-type-submit:active { transform: scale(0.95); }
.jq-try-again {
  font-family: var(--font-mono); font-size: 12px; font-weight: 600; color: #f97316;
  background: rgba(249,115,22,0.1); border-radius: 8px; padding: 8px 12px; margin-bottom: 8px;
  animation: bannerIn 0.3s cubic-bezier(0.34,1.56,0.64,1);
}
.jq-result-banner {
  padding: 12px 16px; border-radius: 10px; font-family: var(--font-body); font-size: 15px;
  font-weight: 600; text-align: center; margin-bottom: 8px;
  animation: bannerIn 0.35s cubic-bezier(0.34,1.56,0.64,1);
}
.jq-result-banner.correct { background: var(--green-bg); color: var(--green-text); }
.jq-result-banner.wrong { background: var(--red-bg); color: var(--red-text); }

/* ── SHARED KEYFRAMES ── */
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.anim-in { animation: fadeUp 0.3s cubic-bezier(0.16,1,0.3,1) both; }

/* ── DARK MODE EXTRAS ── */
[data-theme="dark"] .unit-select-bg { background: linear-gradient(135deg, #050310 0%, #0f0520 40%, #060d1e 100%); }
[data-mode="dark"] .unit-card { background: rgba(255,255,255,0.04); border-color: rgba(255,255,255,0.08); }
[data-mode="dark"] .unit-card:hover { background: rgba(255,255,255,0.07); }
[data-mode="dark"] .browse-search { color: var(--text); }

/* ── DINO VOCAB RUNNER ── */
.dino-container {
  position: relative; width: 100%; display: flex; flex-direction: column;
  align-items: center; gap: 0; min-height: 320px;
}
.dino-how-to {
  display: flex; flex-direction: column; align-items: center;
  padding: 28px 20px; text-align: center; max-width: 480px;
  animation: fadeUp 0.35s cubic-bezier(0.16,1,0.3,1);
}
.dino-how-icon { font-size: 48px; margin-bottom: 10px; }
.dino-how-title {
  font-family: var(--font-serif); font-size: 26px; font-weight: 700;
  margin-bottom: 10px; color: var(--text);
}
.dino-how-desc {
  font-family: var(--font-body); font-size: 14px; color: var(--text-secondary);
  line-height: 1.6; margin-bottom: 18px;
}
.dino-how-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 10px;
  width: 100%; max-width: 360px; margin-bottom: 14px;
}
.dino-how-card {
  padding: 14px 12px; border-radius: 12px; border: 1px solid var(--card-border);
  background: var(--card-bg); display: flex; flex-direction: column; gap: 4px; align-items: center;
}
.dino-how-card.jump { border-color: rgba(34,197,94,0.4); background: rgba(34,197,94,0.06); }
.dino-how-card.duck { border-color: rgba(239,68,68,0.4); background: rgba(239,68,68,0.06); }
.dino-how-key { font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary); }
.dino-how-action { font-family: var(--font-mono); font-size: 16px; font-weight: 700; }
.dino-how-card.jump .dino-how-action { color: #16a34a; }
.dino-how-card.duck .dino-how-action { color: #dc2626; }
.dino-how-detail { font-family: var(--font-body); font-size: 12px; color: var(--text-secondary); }
.dino-how-tip { font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary); margin-bottom: 20px; }
.dino-start-btn {
  padding: 12px 32px; border-radius: 12px; border: none;
  background: var(--blue); color: #fff; font-family: var(--font-mono);
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.15s, box-shadow 0.2s;
}
.dino-start-btn:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(26,77,232,0.35); }
.dino-start-btn:active { transform: scale(0.96); }
.dino-canvas {
  width: 100%; border-radius: 12px; border: 1px solid var(--card-border);
  display: block; touch-action: none; image-rendering: pixelated;
}
.dino-hud {
  display: flex; justify-content: space-between; align-items: center; width: 100%;
  padding: 6px 4px 4px; font-family: var(--font-mono); font-size: 12px; color: var(--text-secondary);
}
.dino-controls {
  display: flex; gap: 12px; margin-top: 10px; width: 100%; justify-content: center;
}
.dino-ctrl-btn {
  flex: 1; max-width: 160px; padding: 14px; border-radius: 12px;
  border: 1px solid var(--card-border); background: var(--card-bg);
  font-family: var(--font-mono); font-size: 13px; font-weight: 600; cursor: pointer;
  color: var(--text); transition: transform 0.15s cubic-bezier(0.34,1.56,0.64,1), background 0.1s;
  user-select: none; -webkit-user-select: none;
}
.dino-ctrl-btn:active { transform: scale(0.93); background: var(--card-border); }
.dino-ctrl-btn.duck-ctrl { color: #dc2626; border-color: rgba(239,68,68,0.3); }

/* Vocab question overlay */
.dino-quiz-overlay {
  position: absolute; inset: 0; background: rgba(0,0,0,0.55);
  display: flex; align-items: center; justify-content: center;
  z-index: 10; border-radius: 12px;
  animation: overlayIn 0.2s ease;
}
.dino-quiz-card {
  background: var(--body-bg); border: 1px solid var(--card-border);
  border-radius: 20px; padding: 24px 20px; width: calc(100% - 40px); max-width: 420px;
  box-shadow: var(--shadow-lg);
  animation: modalSlideUp 0.35s cubic-bezier(0.34,1.56,0.64,1);
}
.dino-quiz-badge {
  font-family: var(--font-mono); font-size: 11px; font-weight: 700; letter-spacing: 1px;
  color: var(--blue); text-transform: uppercase; margin-bottom: 10px;
  background: rgba(26,77,232,0.1); display: inline-block;
  padding: 4px 10px; border-radius: 20px;
}
.dino-quiz-word {
  font-family: var(--font-serif); font-size: 30px; font-weight: 900;
  color: var(--text); margin-bottom: 6px; line-height: 1.1;
}
.dino-quiz-prompt {
  font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary);
  margin-bottom: 14px;
}
.dino-quiz-choices { display: flex; flex-direction: column; gap: 8px; }
.dino-quiz-choice {
  width: 100%; text-align: left; padding: 12px 14px; border-radius: 11px;
  border: 1px solid var(--card-border); background: var(--card-bg);
  font-family: var(--font-body); font-size: 14px; color: var(--text);
  cursor: pointer; line-height: 1.4;
  transition: transform 0.18s cubic-bezier(0.34,1.56,0.64,1), background 0.15s, border-color 0.15s;
  animation: choiceIn 0.3s cubic-bezier(0.16,1,0.3,1) both;
}
.dino-quiz-choice:nth-child(1){animation-delay:0.05s}
.dino-quiz-choice:nth-child(2){animation-delay:0.1s}
.dino-quiz-choice:nth-child(3){animation-delay:0.15s}
.dino-quiz-choice:nth-child(4){animation-delay:0.2s}
.dino-quiz-choice:hover:not(:disabled) { border-color: var(--blue); transform: translateX(4px); }
.dino-quiz-choice:disabled { cursor: default; }
.dino-quiz-choice.correct { background: var(--green-bg); border-color: #22c55e; color: var(--green-text); animation: correctPop 0.4s cubic-bezier(0.34,1.56,0.64,1); }
.dino-quiz-choice.wrong   { background: var(--red-bg);   border-color: #ef4444; color: var(--red-text);   animation: wrongShake 0.4s cubic-bezier(0.16,1,0.3,1); }
.dino-quiz-result { margin-top: 12px; }
.dino-quiz-feedback {
  font-family: var(--font-body); font-size: 14px; font-weight: 600;
  padding: 10px 14px; border-radius: 10px; line-height: 1.5;
  animation: bannerIn 0.3s cubic-bezier(0.34,1.56,0.64,1);
}
.dino-quiz-feedback.correct { background: var(--green-bg); color: var(--green-text); }
.dino-quiz-feedback.wrong   { background: var(--red-bg);   color: var(--red-text); }

/* Game over */
.dino-gameover {
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  padding: 36px 20px; text-align: center;
  animation: scoreCount 0.4s cubic-bezier(0.34,1.56,0.64,1);
}
.dino-go-title  { font-family: var(--font-serif); font-size: 32px; font-weight: 700; }
.dino-go-score  { font-family: var(--font-mono); font-size: 40px; font-weight: 700; color: var(--blue); }
.dino-go-best   { font-family: var(--font-mono); font-size: 13px; color: var(--text-secondary); }

/* ── PHONETIC PRONUNCIATION ── */
.phonetic-tag {
  font-family: 'Lora', Georgia, serif; font-style: italic;
  font-size: 13px; color: var(--text-secondary); letter-spacing: 0.02em;
  background: rgba(0,0,0,0.04); padding: 2px 10px; border-radius: 20px;
  display: inline-block;
}
[data-mode="dark"] .phonetic-tag { background: rgba(255,255,255,0.06); }
.phonetic-browse {
  font-family: 'Lora', Georgia, serif; font-style: italic;
  font-size: 11px; color: var(--text-secondary); margin-top: 1px; letter-spacing: 0.02em;
}

/* ── PRONUNCIATION BUTTONS ── */
.speak-btn {
  background: none; border: none; cursor: pointer; font-size: 14px;
  padding: 2px 4px; border-radius: 6px; line-height: 1;
  transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.15s;
  flex-shrink: 0;
}
.speak-btn:hover { transform: scale(1.2); background: rgba(0,0,0,0.06); }
.speak-btn:active { transform: scale(0.9); }
.word-row-word-row { display: flex; align-items: center; gap: 5px; }
.fc-speak-btn {
  display: flex; align-items: center; gap: 5px; padding: 5px 12px;
  border-radius: 8px; border: 1px solid var(--card-border); background: var(--card-bg);
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  color: var(--text-secondary); cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), background 0.15s, box-shadow 0.15s;
}
.fc-speak-btn:hover { transform: scale(1.05); box-shadow: 0 2px 8px rgba(0,0,0,0.1); background: var(--card-border); }
.fc-speak-btn:active { transform: scale(0.95); }

/* ── DINO BEAT GAME MESSAGE ── */
.dino-beat-msg {
  font-family: var(--font-body); font-size: 14px; line-height: 1.6;
  color: var(--text-secondary); max-width: 320px; text-align: center;
  background: rgba(234,179,8,0.1); border: 1px solid rgba(234,179,8,0.3);
  border-radius: 12px; padding: 14px 16px;
  animation: bannerIn 0.4s cubic-bezier(0.34,1.56,0.64,1);
}
.dino-beat-msg strong { color: var(--text); }

/* ── TOWER DEFENSE ── */
.tower-container { position: relative; width: 100%; display: flex; flex-direction: column; align-items: center; gap: 0; }
.tower-how-to { display: flex; flex-direction: column; align-items: center; padding: 28px 20px; text-align: center; max-width: 480px; animation: fadeUp 0.35s cubic-bezier(0.16,1,0.3,1); }
.tower-canvas {
  width: 100%; border-radius: 12px; border: 1px solid var(--card-border);
  display: block; cursor: pointer; touch-action: none;
}
.tower-hud {
  display: flex; align-items: center; justify-content: space-between; width: 100%;
  padding: 6px 2px 4px; font-family: var(--font-mono); font-size: 12px;
  color: var(--text-secondary); flex-wrap: wrap; gap: 4px;
}
.tw-wave-banner {
  font-family: var(--font-mono); font-size: 12px; font-weight: 700;
  color: var(--gold); opacity: 0; transition: opacity 0.3s;
  pointer-events: none;
}
.tw-wave-banner.active { opacity: 1; animation: bannerIn 0.4s cubic-bezier(0.34,1.56,0.64,1); }
.tower-question-box {
  width: 100%; margin-top: 10px; background: var(--card-bg);
  border: 1px solid var(--card-border); border-radius: 16px; padding: 16px 16px 12px;
  animation: bannerIn 0.35s cubic-bezier(0.34,1.56,0.64,1);
  transition: background 0.35s, border-color 0.35s;
}
.tower-q-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.tower-q-type { font-family: var(--font-mono); font-size: 12px; color: var(--text-secondary); font-weight: 600; }
.tower-q-context {
  font-family: var(--font-mono); font-size: 10px; font-weight: 700;
  padding: 2px 8px; border-radius: 20px;
}
.tower-q-context.place   { background: rgba(26,77,232,0.12);  color: var(--blue); }
.tower-q-context.upgrade { background: rgba(234,179,8,0.12);  color: #d97706; }
.tower-q-context.earn    { background: rgba(34,197,94,0.12);  color: #16a34a; }
.tw-earn-btn {
  font-family: var(--font-mono); font-size: 11px; font-weight: 700;
  padding: 3px 9px; border-radius: 20px; border: 1.5px solid #22c55e;
  background: rgba(34,197,94,0.1); color: #16a34a; cursor: pointer;
  transition: background 0.15s, transform 0.15s;
}
.tw-earn-btn:hover { background: rgba(34,197,94,0.2); transform: scale(1.05); }
.tw-hard-btn { background: #dc2626 !important; }
.tower-q-word {
  font-family: var(--font-serif); font-size: 20px; font-weight: 700;
  color: var(--text); margin-bottom: 10px; line-height: 1.2;
}
.tower-q-choices { display: flex; flex-direction: column; gap: 6px; }
.tower-choice-btn {
  width: 100%; text-align: left; padding: 11px 14px; border-radius: 10px;
  border: 1px solid var(--card-border); background: var(--body-bg);
  font-family: var(--font-body); font-size: 14px; color: var(--text);
  cursor: pointer; line-height: 1.4;
  transition: transform 0.18s cubic-bezier(0.34,1.56,0.64,1), background 0.15s, border-color 0.15s;
  animation: choiceIn 0.3s cubic-bezier(0.16,1,0.3,1) both;
}
.tower-choice-btn:nth-child(1){animation-delay:0.03s}
.tower-choice-btn:nth-child(2){animation-delay:0.08s}
.tower-choice-btn:nth-child(3){animation-delay:0.13s}
.tower-choice-btn:nth-child(4){animation-delay:0.18s}
.tower-choice-btn:hover:not(:disabled) { border-color: var(--blue); transform: translateX(3px); background: rgba(26,77,232,0.04); }
.tower-choice-btn:disabled { cursor: default; }
.tower-choice-btn.correct { background: var(--green-bg); border-color: #22c55e; color: var(--green-text); animation: correctPop 0.4s cubic-bezier(0.34,1.56,0.64,1); }
.tower-choice-btn.wrong   { background: var(--red-bg);   border-color: #ef4444; color: var(--red-text);   animation: wrongShake 0.4s cubic-bezier(0.16,1,0.3,1); }
.tower-q-result { margin-top: 8px; }
.tower-gameover {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  padding: 32px 20px; text-align: center;
  animation: scoreCount 0.4s cubic-bezier(0.34,1.56,0.64,1);
}

/* ── THEME PICKER ── */
.theme-picker { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 10px; }
.theme-swatch {
  display: flex; flex-direction: column; align-items: center; gap: 5px;
  cursor: pointer; transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1);
}
.theme-swatch:hover { transform: scale(1.1); }
.theme-swatch:active { transform: scale(0.95); }
.theme-swatch-circle {
  width: 44px; height: 44px; border-radius: 50%; border: 3px solid transparent;
  transition: border-color 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.theme-swatch.active .theme-swatch-circle {
  border-color: var(--text); box-shadow: 0 0 0 2px var(--body-bg), 0 0 0 4px var(--text);
}
.theme-swatch-label { font-family: var(--font-mono); font-size: 10px; color: var(--text-secondary); }

/* ── RESPONSIVE ── */
@media (max-width: 400px) {
  .logo { font-size: 44px; }
  .tab-btn { font-size: 10px; padding: 6px 10px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.15s !important; }
}

/* ── SPEEDRUN ── */
.speedrun-container { width: 100%; }

/* How-to screen */
.speedrun-how-to { display: flex; flex-direction: column; align-items: center; text-align: center; padding: 32px 20px 36px; }
.speedrun-splash-icon { font-size: 56px; margin-bottom: 12px; filter: drop-shadow(0 4px 16px rgba(26,77,232,0.3)); }
.speedrun-title { font-family: var(--font-serif); font-size: 28px; font-weight: 800; color: var(--text); margin-bottom: 10px; }
.speedrun-desc { font-family: var(--font-mono); font-size: 12px; color: var(--text-secondary); max-width: 340px; line-height: 1.65; margin-bottom: 24px; }
.speedrun-info-cards { display: flex; gap: 12px; margin-bottom: 28px; flex-wrap: wrap; justify-content: center; }
.speedrun-info-card { background: var(--card-bg); border: 1.5px solid var(--card-border); border-radius: 14px; padding: 14px 20px; min-width: 90px; text-align: center; }
.speedrun-info-val { font-family: var(--font-mono); font-size: 22px; font-weight: 800; color: var(--blue); margin-bottom: 4px; }
.speedrun-info-label { font-family: var(--font-mono); font-size: 10px; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.06em; }
.speedrun-start-btn { font-family: var(--font-mono); font-size: 15px; font-weight: 700; padding: 14px 40px; border-radius: 14px; border: none; background: var(--blue); color: #fff; cursor: pointer; letter-spacing: 0.03em; transition: background 0.15s, transform 0.15s, box-shadow 0.15s; box-shadow: 0 4px 18px rgba(26,77,232,0.3); }
.speedrun-start-btn:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 6px 24px rgba(26,77,232,0.4); }
.speedrun-start-btn:active { transform: scale(0.97); }

/* HUD */
.sr-hud { padding: 0 0 14px; }
.sr-hud-top { display: flex; align-items: center; gap: 10px; }
.sr-time-block, .sr-score-block { display: flex; flex-direction: column; align-items: center; min-width: 36px; }
.sr-time-num, .sr-score-num { font-family: var(--font-mono); font-size: 22px; font-weight: 800; color: var(--text); line-height: 1; }
.sr-time-label { font-family: var(--font-mono); font-size: 9px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-secondary); margin-top: 1px; }
.sr-bar-wrap { flex: 1; height: 10px; background: var(--card-border); border-radius: 99px; overflow: hidden; }
.sr-bar-fill { height: 100%; border-radius: 99px; transition: width 0.85s linear, background 0.5s; }

/* Question card */
.sr-card { background: var(--card-bg); border: 1.5px solid var(--card-border); border-radius: 18px; padding: 22px 18px 18px; box-shadow: 0 2px 16px rgba(0,0,0,0.06); }
.sr-type-badge { display: inline-block; font-family: var(--font-mono); font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--blue); background: rgba(26,77,232,0.09); padding: 3px 10px; border-radius: 20px; margin-bottom: 8px; }
.sr-prompt { font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary); margin-bottom: 12px; }
.sr-word { font-family: var(--font-serif); font-size: 26px; font-weight: 800; color: var(--text); margin-bottom: 18px; line-height: 1.2; display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.sr-pos { font-family: var(--font-mono); font-size: 11px; font-weight: 600; color: var(--text-secondary); background: var(--body-bg); border: 1px solid var(--card-border); padding: 2px 7px; border-radius: 6px; }
.sr-choices { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.sr-choice { font-family: var(--font-mono); font-size: 12px; font-weight: 500; padding: 11px 10px; border-radius: 12px; border: 1.5px solid var(--card-border); background: var(--body-bg); color: var(--text); cursor: pointer; text-align: left; line-height: 1.4; transition: background 0.12s, border-color 0.12s, transform 0.1s, box-shadow 0.12s; }
.sr-choice:hover:not(:disabled) { background: var(--card-bg); border-color: var(--blue); transform: translateY(-2px); box-shadow: 0 3px 10px rgba(26,77,232,0.12); }
.sr-choice:active:not(:disabled) { transform: scale(0.97); }
.sr-choice.correct { background: rgba(34,197,94,0.13); border-color: #22c55e; color: #16a34a; font-weight: 700; }
.sr-choice.wrong   { background: rgba(239,68,68,0.10); border-color: #ef4444; color: #dc2626; }
.sr-choice:disabled { cursor: default; }
.sr-feedback { font-family: var(--font-mono); font-size: 15px; font-weight: 800; color: #ef4444; text-align: center; min-height: 22px; margin-top: 10px; opacity: 0; transition: opacity 0.15s; }
.sr-feedback.show { opacity: 1; }
.lb-tag { font-family: var(--font-mono); font-size: 10px; font-weight: 700; color: var(--blue); background: color-mix(in srgb, var(--blue) 12%, transparent); border-radius: 999px; padding: 1px 7px; margin-left: 4px; vertical-align: middle; }