:root{
  --bg:#f4f4f2; --ink:#080808; --muted:#737373; --line:#c9c9c6; --card:#111;
  --good:#1e9a4b; --bad:#d23a33; --white:#fff;
}
*{box-sizing:border-box} html,body{margin:0;min-height:100%;font-family:Inter,Arial,sans-serif;color:var(--ink);background:var(--bg)}
button,input,textarea,select{font:inherit}.screen{min-height:100vh;position:relative;padding:48px 64px 70px;overflow:auto}
.center{display:flex;align-items:center;justify-content:center}.welcome{min-height:100vh;display:flex;align-items:center;justify-content:center;font-size:clamp(52px,8vw,112px);font-weight:700;letter-spacing:-.04em}
.corner-arrow{position:fixed;right:38px;bottom:28px;width:62px;height:62px;border:0;background:transparent;font-size:56px;cursor:pointer}.back,.logout{position:fixed;top:26px;border:0;background:transparent;font-size:34px;cursor:pointer;z-index:5}.back{left:30px}.logout{right:30px;font-size:17px;border:1px solid #bbb;border-radius:999px;padding:10px 16px;background:#fff}
.login-wrap{min-height:100vh;display:grid;place-items:center}.login-card{width:min(460px,90vw);display:grid;gap:16px}.login-card h1{text-align:center;font-size:48px;margin:0 0 20px}.field{display:grid;gap:8px}.field label{font-weight:650}.field input,.field textarea,.field select{width:100%;border:1px solid #b8b8b5;background:#fff;border-radius:14px;padding:14px 16px;outline:none}.field textarea{min-height:100px;resize:vertical}.btn{border:0;border-radius:18px;padding:15px 22px;background:#111;color:#fff;cursor:pointer;font-weight:700}.btn.secondary{background:#fff;color:#111;border:1px solid #bbb}.btn.danger{background:#fff;color:#b21d1d;border:1px solid #dc9d9d}.btn.small{padding:9px 13px;border-radius:12px;font-size:14px}.error{color:#b00020;min-height:20px}.muted{color:var(--muted)}
.dashboard{max-width:980px;margin:0 auto}.dashboard h1,.list-wrap h1,.profile-wrap h1{font-size:52px;margin:30px 0 36px}.tiles{display:grid;grid-template-columns:1fr 1fr;gap:26px}.tile{min-height:230px;border-radius:30px;background:#111;color:#fff;display:flex;align-items:center;justify-content:center;text-align:center;padding:34px;font-size:34px;font-weight:700;cursor:pointer;border:0}.statusbar{margin-top:26px;padding:16px 18px;border:1px solid #ccc;border-radius:18px;background:#fff;display:flex;gap:24px;flex-wrap:wrap}
.list-wrap{max-width:930px;margin:0 auto}.student-list{display:grid;gap:16px}.student-row{background:#fff;border:1px solid #d2d2cf;border-radius:22px;padding:18px 22px;display:flex;align-items:center;justify-content:space-between;gap:18px}.student-name{font-size:31px;font-weight:750}.actions{display:flex;gap:10px}.iconbtn{width:52px;height:52px;border-radius:50%;border:1px solid #aaa;background:#fff;cursor:pointer;font-size:22px}.play{background:#111;color:#fff;border-color:#111}
.profile-wrap{max-width:980px;margin:0 auto}.section{background:#fff;border:1px solid #d2d2cf;border-radius:24px;padding:22px;margin:18px 0}.section h2{margin:0 0 18px;font-size:24px}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}.checkgrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.check{display:flex;align-items:center;gap:10px;padding:10px 12px;border:1px solid #ddd;border-radius:12px}.range-row{display:grid;grid-template-columns:1fr 100px;gap:14px;align-items:center}.range-row input[type=number]{padding:10px;border:1px solid #bbb;border-radius:10px}.profile-actions{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0 50px}.generated{white-space:pre-wrap;line-height:1.55;background:#111;color:#fff;border-radius:22px;padding:22px;min-height:100px}.thumbs{display:flex;gap:10px;flex-wrap:wrap}.thumbs img{width:110px;height:90px;object-fit:cover;border-radius:12px;border:1px solid #ccc}
.ready-screen,.session-screen,.result-screen{min-height:100vh;display:flex;flex-direction:column}.ready-center{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:24px}.ready-title{font-size:clamp(32px,5vw,70px);max-width:1000px;font-weight:750;line-height:1.08}.listening{font-size:18px;color:#666}.mic-dot{width:16px;height:16px;border-radius:50%;background:#d33;display:inline-block;box-shadow:0 0 0 0 rgba(211,51,51,.6);animation:pulse 1.5s infinite}@keyframes pulse{70%{box-shadow:0 0 0 16px rgba(211,51,51,0)}100%{box-shadow:0 0 0 0 rgba(211,51,51,0)}}
.top-timer{width:min(760px,80vw);margin:0 auto 26px}.timer-meta{display:flex;justify-content:space-between;font-size:16px;margin-bottom:8px}.bar{height:8px;background:#ddd;border-radius:999px;overflow:hidden}.bar>div{height:100%;background:#111;transition:width .25s linear}.question-area{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:10px 10vw 100px}.question-text{font-size:clamp(30px,4vw,62px);line-height:1.12;font-weight:750;max-width:1100px}.choices{display:grid;gap:12px;margin-top:28px;width:min(720px,90vw)}.choice{padding:16px 20px;background:#fff;border:1px solid #bbb;border-radius:16px;font-size:22px;text-align:left}.transcript{margin-top:30px;font-size:clamp(26px,3vw,46px);color:#555;min-height:56px}.feedback{font-size:clamp(34px,4vw,64px);font-weight:800;max-width:950px}.feedback.good{color:var(--good)}.feedback.bad{color:var(--bad)}.nextline{margin-top:22px;font-size:26px;color:#444}.student-exit{position:fixed;left:26px;bottom:24px;border:1px solid #bbb;background:#fff;border-radius:50%;width:54px;height:54px;font-size:22px;cursor:pointer;z-index:5}.session-clock{position:fixed;right:28px;bottom:28px;background:#111;color:#fff;border-radius:999px;padding:12px 18px;font-variant-numeric:tabular-nums;font-weight:700;z-index:5}.result-card{margin:auto;width:min(700px,90vw);background:#fff;border:1px solid #ccc;border-radius:28px;padding:34px;text-align:center}.score{font-size:70px;font-weight:850}.result-card h1{font-size:46px;margin:0 0 14px}.stats{display:flex;justify-content:center;gap:28px;margin:24px 0}.stat strong{display:block;font-size:32px}
@media(max-width:720px){.screen{padding:38px 20px 75px}.tiles{grid-template-columns:1fr}.dashboard h1,.list-wrap h1,.profile-wrap h1{font-size:38px}.student-row{align-items:flex-start}.student-name{font-size:25px}.grid2,.checkgrid{grid-template-columns:1fr}.top-timer{width:88vw}.question-area{padding-left:6vw;padding-right:6vw}.logout{top:16px;right:16px}.back{top:15px;left:14px}}

/* v0.2 */
.feedback.inactivity{color:#111}
.presence-btn{margin-top:28px;min-width:190px}
.result-card.interrupted{border-color:#d23a33}
.result-card.interrupted h1,.interrupt-note,.time-progress{color:var(--bad)}
.interrupt-note{font-size:20px;font-weight:750;margin-top:6px}
.time-progress{font-size:24px;font-weight:800;margin:14px 0 6px;font-variant-numeric:tabular-nums}
.score-caption{color:var(--muted);margin-top:-8px;margin-bottom:16px}
.time-summary{color:var(--muted);margin:0 0 24px;font-variant-numeric:tabular-nums}
@media(max-width:720px){.stats{display:grid;grid-template-columns:1fr 1fr;gap:18px}.time-progress{font-size:20px}}

/* v0.3.0 */
.explain-field{margin-top:18px}
.radio-stack{display:grid;gap:9px;margin-top:10px}
.radio-option{display:flex;align-items:center;gap:10px;padding:11px 13px;border:1px solid #ddd;border-radius:12px;background:#fafafa;cursor:pointer}
.radio-option input{width:18px;height:18px}
.explanation-title{font-size:20px;font-weight:800;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:14px}
.explanation-text{font-size:clamp(30px,3.4vw,52px);font-weight:720;line-height:1.2;max-width:1000px}

/* v0.4.0 */
.tiles{grid-template-columns:repeat(3,minmax(0,1fr))}
.tile.system-tile{background:#fff;color:#111;border:1px solid #aaa}
.ready-actions,.system-actions{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
.system-actions{justify-content:flex-start;margin-top:14px}
.system-msg{margin-top:12px;min-height:22px}
.advanced{margin-top:16px;padding:12px 14px;border:1px dashed #bbb;border-radius:14px;background:#fafafa}
.advanced summary{cursor:pointer;font-weight:700}
.advanced .grid2{margin-top:14px}
.penalty-phrase{margin-top:24px;font-size:clamp(25px,3vw,44px);line-height:1.22;font-weight:700;max-width:1000px;color:#222}
@media(max-width:900px){.tiles{grid-template-columns:1fr 1fr}.tile.system-tile{grid-column:1/-1}}
@media(max-width:720px){.tiles{grid-template-columns:1fr}.tile.system-tile{grid-column:auto}.ready-actions,.system-actions{flex-direction:column;width:min(420px,90vw)}.ready-actions .btn,.system-actions .btn{width:100%}}

/* v0.5.0 */
.radio-inline{display:flex;gap:10px;flex-wrap:wrap;margin:8px 0 10px}
.radio-inline .radio-option{flex:1 1 240px}

/* v0.6.0 */
.subsection{margin-top:18px;padding:16px;border:1px solid #e0e0dc;border-radius:16px;background:#fafafa}
.subsection h3{margin:0 0 12px;font-size:18px}
.check-field{align-content:end}.check-field label{padding:14px 16px;border:1px solid #d0d0cc;border-radius:14px;background:#fafafa;font-weight:600}.check-field input{width:auto;margin-right:8px}
.preparing{display:flex;flex-direction:column;align-items:center;gap:14px;max-width:700px}.preparing-title{font-size:clamp(32px,4vw,54px);font-weight:800}.spinner{width:42px;height:42px;border:4px solid #d4d4d0;border-top-color:#111;border-radius:50%;animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}

/* v0.7.0 */
.welcome-custom{position:relative;overflow:hidden;background:#111}
.welcome-video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0}
.welcome-overlay{position:absolute;inset:0;z-index:1;pointer-events:none}
.welcome-title{position:relative;z-index:2}
.corner-arrow{z-index:4;border-radius:999px;display:grid;place-items:center}
.top-timer.hidden{visibility:hidden}
.bar>div{background:#1479e8}
.answer-heard{margin-bottom:20px;padding:10px 16px;border:1px solid #d6d6d2;border-radius:14px;background:#fff;font-size:18px;color:#444;max-width:900px}
.answer-heard span{font-weight:750;color:#222}
.pause-ring-wrap{display:flex;justify-content:center;align-items:center;margin-top:26px}
.pause-ring{width:64px;height:64px;transform:rotate(-90deg)}
.pause-ring circle{fill:none;stroke-width:4}
.pause-ring-bg{stroke:#ddd}
.pause-ring-fg{stroke:#1479e8;stroke-linecap:round;stroke-dasharray:113.1;stroke-dashoffset:113.1;animation:pauseRingFill var(--pause-ms,4000ms) linear forwards}
@keyframes pauseRingFill{to{stroke-dashoffset:0}}
.creator-cost{margin:18px 0 24px;padding:12px 14px;border:1px dashed #bbb;border-radius:14px;color:#666;font-size:14px}
.compact-stats{justify-content:flex-start;flex-wrap:wrap}
.compact-stats .stat{min-width:110px;text-align:center;padding:10px 12px;border:1px solid #ddd;border-radius:14px;background:#fafafa}
.field input[type=color]{height:48px;padding:5px;cursor:pointer}
.field input[type=range]{padding:0;border:0;background:transparent}