/* style.css — StackSkill（StackWorld ダークテーマ準拠 / §6.2 UI原則） */

:root{
  color-scheme: dark;
  --bg0:#070a12;
  --bg1:#0b1220;
  --text:rgba(255,255,255,.92);
  --muted:rgba(255,255,255,.62);
  --card:rgba(2,6,23,.55);
  --card2:rgba(15,23,42,.72);
  --border:rgba(255,255,255,.10);
  --accent:rgba(129,140,248,.95);
  --accent-bg:rgba(99,102,241,.18);
  --accent-line:rgba(99,102,241,.5);
  --ok:#34d399;
  --ng:#fb923c;
  --warn:#fbbf24;
  --good:#38bdf8;
}
*{ box-sizing:border-box; }
[hidden]{ display:none !important; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic", sans-serif;
  color:var(--text);
  background:
    radial-gradient(1200px 800px at 10% 0%, rgba(111,123,255,.12), transparent 55%),
    radial-gradient(900px 700px at 90% 10%, rgba(56,189,248,.10), transparent 55%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
}
.page{ min-height:100%; padding:16px; display:flex; justify-content:center; }
.shell{
  width:min(880px,100%);
  border-radius:24px;
  background:rgba(15,23,42,.94);
  box-shadow:0 30px 80px rgba(0,0,0,.9), 0 0 0 1px rgba(148,163,184,.2);
  overflow:hidden;
  display:flex;
  flex-direction:column;
}

/* グローバルエラーパネル（§DOM Contract: errorPanel） */
.error-panel{
  margin:0; padding:12px 16px;
  background:rgba(127,29,29,.96);
  color:#fff; font-size:13px; font-weight:700;
  text-align:center;
}

/* ---------- header ---------- */
.header{
  padding:14px 18px;
  display:flex; align-items:center; justify-content:space-between;
  gap:12px; flex-wrap:wrap;
  border-bottom:1px solid rgba(255,255,255,.08);
  background:rgba(2,6,23,.35);
}
.header-left{ display:flex; align-items:center; gap:12px; }
.logo-orb{
  width:36px; height:36px; border-radius:999px;
  background:
    radial-gradient(circle at 30% 20%, #38bdf8, transparent 55%),
    radial-gradient(circle at 80% 80%, #6366f1, transparent 55%),
    radial-gradient(circle at 10% 90%, #0ea5e9, transparent 55%);
  box-shadow:0 0 18px rgba(56,189,248,.5);
}
.brand{ font-weight:800; letter-spacing:.02em; }
.brand small{ display:block; font-weight:500; font-size:11px; color:var(--muted); }
.header-right{ display:flex; align-items:center; gap:14px; font-size:13px; }
.stat{ display:flex; flex-direction:column; align-items:flex-end; line-height:1.2; }
.stat b{ font-size:14px; }
.stat span{ font-size:10px; color:var(--muted); text-transform:uppercase; letter-spacing:.08em; }
.ok{ color:var(--ok); } .ng{ color:var(--ng); } .muted{ color:var(--muted); }

/* ---------- main ---------- */
.main{ padding:20px 20px 28px; }
.crumbs{ font-size:12px; color:var(--muted); margin-bottom:8px; }
h1.title{ font-size:22px; margin:0 0 4px; }
.subtitle{ color:var(--muted); font-size:13px; margin:0 0 18px; }

.card{
  background:var(--card2);
  border:1px solid var(--border);
  border-radius:16px;
  padding:16px 18px;
  margin-bottom:14px;
}
.card h2{ font-size:15px; margin:0 0 10px; }
.meta-row{ display:flex; gap:16px; flex-wrap:wrap; font-size:12px; color:var(--muted); margin-bottom:12px; }
.meta-row b{ color:var(--text); font-size:13px; }

/* Quest list（today） */
.quest{
  display:flex; align-items:center; gap:12px;
  padding:12px 14px; border:1px solid var(--border); border-radius:12px;
  margin-bottom:10px; background:var(--card);
}
.quest .dot{ width:10px; height:10px; border-radius:999px; background:var(--accent); flex:none; }
.quest .dot.review{ background:var(--warn); }
.quest .qbody{ flex:1; min-width:0; }
.quest .qbody b{ font-size:14px; }
.quest .qbody span{ display:block; font-size:12px; color:var(--muted); }
.quest .qmin{ font-size:12px; color:var(--muted); white-space:nowrap; }

/* Question */
.stem{ font-size:16px; line-height:1.6; margin:0 0 16px; }
.choices{ display:flex; flex-direction:column; gap:10px; }
.choice{
  text-align:left; padding:12px 14px; border-radius:12px;
  border:1px solid var(--border); background:var(--card);
  color:var(--text); font-size:14px; cursor:pointer;
}
.choice:hover{ border-color:var(--accent-line); }
.choice[aria-pressed="true"]{ border-color:var(--accent); background:var(--accent-bg); }

/* Result */
.verdict{ font-size:20px; font-weight:800; margin:0 0 12px; }
.verdict.correct{ color:var(--ok); }
.verdict.wrong{ color:var(--ng); }
.verdict.unknown{ color:var(--warn); }
.reason-block{ margin:0 0 14px; }
.reason-block h3{ font-size:13px; color:var(--muted); margin:0 0 4px; text-transform:uppercase; letter-spacing:.06em; }
.reason-block p{ margin:0; font-size:14px; line-height:1.6; }

/* progress bar */
.progress{ height:8px; border-radius:999px; background:rgba(255,255,255,.08); overflow:hidden; }
.progress > i{ display:block; height:100%; background:linear-gradient(90deg,#38bdf8,#6366f1); }
.progress-label{ font-size:12px; color:var(--muted); margin-top:6px; }

/* buttons */
.btn{
  appearance:none; border:1px solid var(--border); border-radius:12px;
  padding:12px 18px; font-size:14px; font-weight:700; cursor:pointer;
  background:var(--card); color:var(--text);
}
.btn:hover{ border-color:var(--accent-line); }
.btn.primary{ background:linear-gradient(90deg,#4f46e5,#0ea5e9); border:none; color:#fff; }
.btn.primary:disabled{ opacity:.5; cursor:not-allowed; }
.btn.ghost{ background:transparent; }
.actions{ display:flex; gap:10px; flex-wrap:wrap; margin-top:16px; }

.footer{ padding:12px 18px; border-top:1px solid rgba(255,255,255,.08); font-size:11px; color:var(--muted); display:flex; justify-content:space-between; gap:8px; flex-wrap:wrap; }
.mock-badge{ display:inline-block; padding:2px 8px; border-radius:999px; background:rgba(251,191,36,.16); color:var(--warn); font-size:11px; font-weight:700; }

@media (max-width:520px){
  .main{ padding:16px 14px 22px; }
  h1.title{ font-size:19px; }
}