/*
Theme Name: Thu Tra English
Theme URI: https://example.org/
Author: Thu Tra English
Description: Responsive English learning theme for 10 original Our World 2-aligned practice units.
Version: 1.3.0
Requires PHP: 8.0
Text Domain: thu-tra-english
*/
:root{--purple:#6246ea;--ink:#25304a;--muted:#66718a;--bg:#f6f8ff;--line:#e6e8f2}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,'Segoe UI',sans-serif;color:var(--ink);background:var(--bg);line-height:1.55}a{color:inherit;text-decoration:none}.top{background:white;display:flex;align-items:center;justify-content:space-between;padding:17px max(24px,calc((100vw - 1140px)/2));gap:20px;box-shadow:0 2px 14px #2424500d}.brand{font-weight:850;font-size:24px;color:var(--purple)}.brand span{color:#ff9a24}.top nav{display:flex;flex-wrap:wrap;gap:19px;font-weight:650;font-size:14px}.top nav a:hover{color:var(--purple)}.wrap{max-width:1140px;margin:0 auto;padding:32px 20px 70px}.hero{display:grid;grid-template-columns:1.4fr 1fr;gap:28px;align-items:center;background:linear-gradient(130deg,#eee8ff,#e2f8ff);padding:58px 50px;border-radius:30px}.hero h1{font-size:clamp(32px,4.5vw,54px);line-height:1.14;letter-spacing:-1.5px;margin:12px 0}.hero p{font-size:18px;max-width:540px}.hero-art{text-align:center;font-size:78px;background:white;border-radius:28px;padding:55px 15px;box-shadow:0 18px 40px #6542b51c}.hero-art small{display:block;font-size:18px;color:var(--purple);font-weight:800}.eyebrow{color:var(--purple);font-size:13px;font-weight:850;letter-spacing:2px}.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.btn,button{font:inherit;cursor:pointer;border:0;border-radius:14px;padding:12px 19px;background:var(--purple);color:white;font-weight:750;display:inline-block}.btn.secondary,button.secondary{background:#edeaff;color:#4934b2}.btn:hover,button:hover{filter:brightness(.94)}button:disabled{opacity:.55;cursor:not-allowed}.features{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:25px 0}.card,.app{background:white;border:1px solid var(--line);border-radius:23px;padding:25px;margin:20px 0;box-shadow:0 5px 22px #26326d08}.card h3{margin:6px 0}.bigemoji{font-size:37px}.heading{text-align:center;padding:15px}.heading h1{font-size:clamp(28px,4vw,43px);margin:8px 0}.heading p,.muted{color:var(--muted)}.unit-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(205px,1fr));gap:13px;margin-top:16px}.unit-card{border:2px solid var(--line);background:#fff;border-radius:18px;padding:18px;text-align:left;color:var(--ink);min-height:120px}.unit-card:hover,.unit-card.selected{border-color:var(--purple);background:#f5f1ff}.unit-card b{display:block;font-size:17px}.unit-card small{color:var(--muted)}.unit-number{display:inline-block;border-radius:10px;background:#e8e1ff;color:#4f37c9;padding:3px 10px;margin-bottom:10px;font-weight:800}.session-tabs{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0}.session-tabs button{background:#f0edff;color:#4f38bb}.session-tabs button.active{background:var(--purple);color:#fff}.practice-card{border:2px solid #e6e1ff;background:linear-gradient(145deg,#fff,#f9f7ff);padding:25px;border-radius:22px;margin:15px 0}.practice-card h2{font-size:clamp(24px,4vw,35px);margin:8px 0}.practice-card .translation{color:#66718a}.controls{display:flex;flex-wrap:wrap;gap:10px;margin-top:15px}.status{padding:12px;border-radius:12px;background:#eff6ff;margin:12px 0;color:#24416d}.quiz-options{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:15px 0}.quiz-options button{background:#edf1ff;color:#27365d;text-align:left}.quiz-options button.picked{background:#d9ceff;outline:2px solid var(--purple)}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.stat{background:#f3f0ff;border-radius:14px;padding:16px}.stat b{display:block;font-size:28px;color:var(--purple)}.history{width:100%;border-collapse:collapse}.history th,.history td{border-bottom:1px solid var(--line);text-align:left;padding:11px 6px;font-size:14px}.tte-form form{display:grid;gap:13px;max-width:440px}.tte-form label{display:grid;gap:5px;font-weight:650}.tte-form input,.field{width:100%;padding:12px;border:1px solid #d6dbea;border-radius:11px;font:inherit}.footer{text-align:center;padding:30px;background:#eae8fa;color:#5c5780}.back{background:#eae8ff;color:#4f38bb;margin-bottom:12px}.mini{font-size:13px;color:var(--muted)}@media(max-width:750px){.top{padding:16px;display:block}.top nav{margin-top:12px;gap:12px}.hero{grid-template-columns:1fr;padding:32px 22px}.hero-art{padding:28px 10px;font-size:52px}.features{grid-template-columns:1fr}.wrap{padding:20px 12px 50px}.card,.app{padding:17px}.stats{grid-template-columns:1fr}.quiz-options{grid-template-columns:1fr}.history{display:block;overflow-x:auto}}

.lesson-plan{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:16px 0}.lesson-plan>div{padding:14px;border-radius:14px;background:#f0f5ff}.lesson-plan strong{display:block;color:#513dc6}.lesson-plan small{color:#66718a}.timer{display:inline-block;background:#fff2d8;color:#7c530b;padding:7px 12px;border-radius:12px;font-weight:700}.lesson-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:18px}.feedback{border-left:4px solid #6246ea;background:#f4f1ff;padding:12px;margin:12px 0;border-radius:8px}@media(max-width:650px){.lesson-plan{grid-template-columns:1fr}}

/* V1.3: picture-first, English immersion lesson UI */
.session-tabs{position:sticky;top:0;z-index:3;background:#fff;padding:10px 0;overflow-x:auto;flex-wrap:nowrap}.session-tabs button{white-space:nowrap}.picture-card{display:grid;grid-template-columns:minmax(0,1fr) 210px;align-items:center;gap:20px;min-height:230px}.picture{background:linear-gradient(135deg,#e7f5ff,#f2edff);border-radius:24px;min-height:180px;display:flex;align-items:center;justify-content:center;font-size:100px}.ipa{font-family:Arial,sans-serif;font-size:22px;color:#6354aa;margin:4px 0 15px}.lesson-intro{font-size:18px;font-weight:600}.dialogue-card,.video-card{background:#f7f8ff;border-radius:22px;padding:25px;margin:18px 0}.dialogue-line{display:flex;gap:15px;align-items:flex-start;margin:15px 0;padding:15px;background:#fff;border-radius:15px}.speaker{border-radius:50%;background:#6147e9;color:white;font-weight:800;min-width:38px;height:38px;display:grid;place-items:center}.dialogue-line b{font-size:20px}.video-card{text-align:center;padding:50px 25px}.video-icon{font-size:72px}.quiz-prompt{display:flex;gap:20px;align-items:center}.quiz-picture{font-size:70px;background:#eaf3ff;border-radius:18px;padding:10px 25px}.controls .record,.controls .play{background:#eae5ff;color:#4730b0}@media(max-width:650px){.picture-card{grid-template-columns:1fr 105px;padding:14px;gap:10px;min-height:155px}.picture{font-size:58px;min-height:105px}.picture-card h2{font-size:24px}.ipa{font-size:17px}.controls button{font-size:12px;padding:9px}.session-tabs{gap:6px}.session-tabs button{padding:9px 12px}.dialogue-line b{font-size:17px}}

.picture img,.quiz-picture img{width:100%;height:100%;max-height:180px;object-fit:contain}.image-pending{font-size:16px;color:#596b87}.video-frame{position:relative;aspect-ratio:16/9;max-width:800px;margin:20px auto;background:#101c35;border-radius:16px;overflow:hidden}.video-frame iframe,.video-play,.video-play img{position:absolute;inset:0;width:100%;height:100%;border:0}.video-play{padding:0;cursor:pointer;background:#111}.video-play img{object-fit:cover}.video-play span{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:#ed2024;color:white;border-radius:16px;padding:15px 25px;font-size:32px}