/* GScale Code ポータル。配色は trial/decisions.md 5（家庭教師の動画と同じ）。 */
:root {
  --navy: #1A365D;
  --blue: #3182CE;
  --orange: #DD6B20;
  --bg: #F7FAFC;
  --card: #FFFFFF;
  --ink: #1A202C;
  --muted: #5A6778;
  --line: #E2E8F0;
  --radius: 16px;
  font-size: 17px;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", "Meiryo", sans-serif;
  line-height: 1.7;
}
a { color: var(--blue); }
h1 { font-size: 1.6rem; color: var(--navy); margin: 0.4em 0 0.6em; }
h2 { font-size: 1.2rem; color: var(--navy); margin: 0 0 0.5em; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 16px; }
.topbar {
  display: flex; flex-wrap: wrap; gap: 8px 20px; align-items: center; justify-content: space-between;
  padding: 12px 16px; background: var(--navy); color: #fff;
}
.brand { color: #fff; text-decoration: none; font-weight: 700; font-size: 1.15rem; display: inline-flex; align-items: center; gap: 10px; }
.brand-mark { display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 10px; background: var(--orange); color: #fff; }
.nav { display: flex; flex-wrap: wrap; gap: 4px 16px; align-items: center; }
.nav a, .nav .linklike { color: #fff; text-decoration: none; font-size: 0.95rem; }
.nav form { margin: 0; }
.linklike { background: none; border: 0; padding: 0; font: inherit; cursor: pointer; text-decoration: underline; }
.foot { text-align: center; color: var(--muted); font-size: 0.85rem; padding: 24px 16px 40px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: 0 1px 3px rgba(26, 54, 93, 0.06); }
.stack { display: grid; gap: 10px; }
.row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.sub { color: var(--muted); font-size: 0.92rem; }
.center { text-align: center; }
.lead { font-size: 1.05rem; }
.eyebrow { color: var(--orange); font-weight: 700; margin: 0 0 4px; }
.hello { margin-top: 8px; }
.section-title { margin-top: 32px; }
.crumb { color: var(--muted); font-size: 0.9rem; margin: 0; }
.alert { background: #FFF5EB; border: 1px solid #F6AD55; color: #7B341E; border-radius: 12px; padding: 12px 14px; }
.ok { background: #EBF8FF; border: 1px solid #90CDF4; color: var(--navy); border-radius: 12px; padding: 12px 14px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: 0; border-radius: 999px; padding: 12px 22px; font: inherit; font-weight: 700;
  cursor: pointer; text-decoration: none; min-height: 48px;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-accent { background: var(--orange); color: #fff; }
.btn-ghost { background: transparent; color: var(--navy); border: 2px solid var(--line); }
.btn-big { font-size: 1.2rem; padding: 16px 34px; min-height: 60px; }
.btn-wide { width: 100%; }
.btn:hover { filter: brightness(1.06); }
.btn:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid #90CDF4; outline-offset: 2px; }
input[type=email], select {
  font: inherit; padding: 12px 14px; border: 2px solid var(--line); border-radius: 12px; background: #fff; min-height: 48px; width: 100%; max-width: 420px;
}
.login { max-width: 480px; margin: 40px auto 16px; }

.hero { border-left: 8px solid var(--orange); }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); }
.lesson-card { display: block; color: inherit; text-decoration: none; transition: transform 0.1s; }
.lesson-card:hover { transform: translateY(-2px); }
.lesson-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.num { font-weight: 700; color: var(--navy); }
.lesson-title { font-weight: 700; font-size: 1.05rem; margin: 6px 0 0; }
.thumb { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 12px; margin-bottom: 12px; }
.thumb-plain { display: grid; place-items: center; background: linear-gradient(135deg, var(--navy), var(--blue)); color: #fff; font-size: 1.6rem; font-weight: 700; }

.badge { display: inline-block; border-radius: 999px; padding: 2px 12px; font-size: 0.82rem; font-weight: 700; white-space: nowrap; margin: 1px 2px; }
.badge-todo { background: #EDF2F7; color: var(--muted); }
.badge-doing { background: #FEEBC8; color: #9C4221; }
.badge-done { background: #BEE3F8; color: var(--navy); }
.badge-mark { background: #FFF5EB; color: var(--orange); border: 1px solid #FBD38D; }
.list { list-style: none; margin: 0; padding: 12px 20px; }
.list li { padding: 8px 0; border-bottom: 1px solid var(--line); }
.list li:last-child { border-bottom: 0; }

.lesson-layout { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr); gap: 20px; align-items: start; }
.lesson-main { display: grid; gap: 16px; }
.lesson-side { display: grid; gap: 16px; position: sticky; top: 16px; }
.video { position: relative; aspect-ratio: 16 / 9; background: #000; border-radius: var(--radius); overflow: hidden; }
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.prose { overflow-wrap: anywhere; }
.prose h1 { font-size: 1.35rem; }
.prose h2 { font-size: 1.15rem; margin-top: 1.2em; }
.prose table { border-collapse: collapse; width: 100%; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--line); padding: 6px 10px; }
.prose code { background: #EDF2F7; border-radius: 6px; padding: 1px 6px; }

.table-wrap { overflow-x: auto; padding: 0; }
.table { border-collapse: collapse; width: 100%; font-size: 0.95rem; }
.table th, .table td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.table th { background: #EDF2F7; color: var(--navy); white-space: nowrap; }
.nowrap { white-space: nowrap; }
.pre { white-space: pre-line; }

.modal { position: fixed; inset: 0; background: rgba(26, 54, 93, 0.55); display: grid; place-items: center; padding: 16px; z-index: 10; }
.modal[hidden] { display: none; }
.modal-box { position: relative; background: #fff; border-radius: var(--radius); padding: 24px; width: min(760px, 100%); max-height: 100%; overflow: auto; display: grid; gap: 14px; }
.modal-close { position: absolute; top: 8px; right: 12px; background: none; border: 0; font-size: 1.6rem; cursor: pointer; color: var(--muted); }
.modal.embed .modal-box { width: 100%; height: 100%; padding: 8px; }
.room-frame { width: 100%; height: 100%; min-height: 70vh; border: 0; border-radius: 12px; }

@media (max-width: 860px) {
  .lesson-layout { grid-template-columns: 1fr; }
  .lesson-side { position: static; }
  :root { font-size: 16px; }
  .btn-big { width: 100%; }
}