:root{
  --ink:#1d2733; --muted:#6b7785; --line:#e4e8ec;
  --brand:#0f766e; --brand-d:#0b5a54; --bg:#f4f6f8;
  --good:#16a34a; --mid:#d97706; --low:#dc2626;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);
  font:16px/1.55 system-ui,Segoe UI,Roboto,Helvetica,Arial,sans-serif}
.wrap{max-width:820px;margin:0 auto;padding:24px 18px 60px}

.brand{display:flex;align-items:center;gap:10px;margin:8px 0 22px}
.logo{font-weight:800;letter-spacing:2px;color:#fff;background:var(--brand);
  padding:6px 12px;border-radius:8px}
.brand-sub{color:var(--muted);font-weight:600;letter-spacing:.3px}

.card{background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:26px 28px;margin-bottom:20px;box-shadow:0 1px 2px rgba(20,30,40,.04)}
.card.narrow{max-width:420px;margin-inline:auto}
.card.center{text-align:center}

h1{margin:.1em 0 .4em;font-size:1.7rem}
h2.section{margin:26px 0 6px;font-size:1.05rem;color:var(--brand-d);
  border-bottom:2px solid var(--line);padding-bottom:6px}
h3{margin:1.4em 0 .5em}
.lead{color:var(--muted);font-size:1.05rem}
.muted{color:var(--muted)}
.small{font-size:.88rem}
.err{color:var(--low);font-weight:600}

ul.info{color:var(--muted);padding-left:18px}
ul.info li{margin:4px 0}

label{display:block;margin:14px 0;font-weight:600}
input[type=text],input[type=email],input[type=password],textarea{
  width:100%;margin-top:6px;padding:11px 12px;border:1px solid var(--line);
  border-radius:9px;font:inherit;font-weight:400;background:#fff}
input[type=number]{padding:8px 10px;border:1px solid var(--line);border-radius:8px;width:90px;font:inherit}
textarea{resize:vertical}

.btn{display:inline-block;background:var(--brand);color:#fff;border:0;
  padding:12px 22px;border-radius:10px;font:inherit;font-weight:700;cursor:pointer;
  text-decoration:none;margin-top:14px}
.btn:hover{background:var(--brand-d)}
.btn.small{padding:7px 14px;margin:0;font-size:.9rem}

.q{padding:16px 0;border-bottom:1px solid var(--line)}
.q-prompt{font-weight:600;margin:0 0 10px}
.q-num{color:var(--brand);font-weight:800;margin-right:4px}
.opt{display:flex;align-items:flex-start;gap:10px;font-weight:400;
  margin:7px 0;padding:9px 12px;border:1px solid var(--line);border-radius:9px;cursor:pointer}
.opt:hover{border-color:var(--brand);background:#f0fbf9}
.opt input{margin-top:3px}

.big-check{font-size:3rem;color:#fff;background:var(--good);width:78px;height:78px;
  line-height:78px;border-radius:50%;margin:0 auto 10px}

/* admin */
.row-between{display:flex;justify-content:space-between;align-items:center}
.back{color:var(--brand);text-decoration:none;font-weight:600}
table.list{width:100%;border-collapse:collapse;margin-top:10px}
table.list th{text-align:left;font-size:.8rem;text-transform:uppercase;color:var(--muted);
  border-bottom:2px solid var(--line);padding:8px 8px}
table.list td{padding:11px 8px;border-bottom:1px solid var(--line);vertical-align:middle}

.status{font-size:.78rem;padding:3px 9px;border-radius:20px;text-transform:capitalize}
.status.submitted{background:#eef6ff;color:#1d4ed8}
.status.reviewed{background:#eaf8ef;color:#15803d}
.status.in_progress{background:#fff4e5;color:#b45309}

.pill{font-weight:700;padding:4px 11px;border-radius:20px;white-space:nowrap}
.pill.good{background:#eaf8ef;color:var(--good)}
.pill.mid{background:#fff4e5;color:var(--mid)}
.pill.low{background:#fdeaea;color:var(--low)}

.scorebox{display:flex;align-items:baseline;gap:14px;margin:6px 0 4px}
.score-big{font-size:2.2rem;font-weight:800}
.score-pct{font-size:1.2rem;color:var(--muted);font-weight:700}

table.trait-table{width:100%;border-collapse:collapse}
.trait-table td{padding:6px 8px}
.t-name{width:160px;font-weight:600}
.t-bar{background:var(--line);border-radius:8px;height:14px;position:relative;overflow:hidden}
.t-bar span{position:absolute;left:0;top:0;bottom:0;background:var(--brand);border-radius:8px}
.t-num{width:70px;text-align:right;color:var(--muted)}

.review{padding:14px 0;border-bottom:1px solid var(--line)}
.tag{font-size:.72rem;background:#eef2f5;color:var(--muted);padding:2px 8px;border-radius:20px;margin-left:6px}
.answer-text{background:#f8fafb;border:1px solid var(--line);border-radius:9px;padding:12px;margin:8px 0}
.grade{font-weight:600}
.ok{color:var(--good)} .bad{color:var(--low)}

.ai-cols{display:flex;gap:24px;flex-wrap:wrap;margin-top:6px}
.ai-cols>div{flex:1;min-width:220px}
.ai-cols ul{margin:.3em 0;padding-left:18px}
.ai-cols h4{margin:.2em 0 .3em}
h4{margin:1.1em 0 .3em}

/* Live AI Challenge */
.task-box{background:#f0fbf9;border:1px solid #cdeae6;border-radius:11px;padding:14px 16px;margin:14px 0}
.task-box>strong{color:var(--brand-d)}
.chat{display:flex;flex-direction:column;gap:10px;min-height:120px;max-height:420px;overflow-y:auto;
  padding:12px;background:#f8fafb;border:1px solid var(--line);border-radius:11px;margin:8px 0}
.bubble{max-width:80%;padding:10px 13px;border-radius:12px;line-height:1.45;white-space:pre-wrap;word-wrap:break-word}
.bubble.me{align-self:flex-end;background:var(--brand);color:#fff;border-bottom-right-radius:3px}
.bubble.ai{align-self:flex-start;background:#fff;border:1px solid var(--line);border-bottom-left-radius:3px}
.bubble.ai.thinking{color:var(--muted);font-style:italic}
.bubble.ai.err{background:#fdeaea;border-color:#f5c2c2;color:var(--low)}
.bubble .who{display:block;font-size:.68rem;text-transform:uppercase;letter-spacing:.4px;opacity:.7;margin-bottom:3px}
.chat-input{display:flex;gap:8px;align-items:flex-end}
.chat-input textarea{flex:1;margin:0}
.chat-input .btn{margin:0}
.btn.finish{background:#475569;margin-top:14px}
.btn.finish:hover{background:#334155}
.review-chat{max-height:none}

.foot{text-align:center;color:var(--muted);font-size:.82rem;margin-top:30px}