/* ================================================================
   中三電腦科 · Programmer 之路 — S3 Portal 樣式
   GitHub Dark × IDE/終端機美感
   ================================================================ */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:ital,wght@0,400;0,600;0,800;1,400&family=Fira+Code:wght@400;600&family=Noto+Sans+TC:wght@400;500;700;900&display=swap');

:root {
  --bg: #0d1117;
  --bg2: #161b22;
  --panel: #161b22;
  --panel2: #21262d;
  --line: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --green: #3fb950;
  --blue: #58a6ff;
  --orange: #d29922;
  --purple: #bc8cff;
  --pink: #f778ba;
  --ltblue: #79c0ff;
  --red: #f85149;
  --mono: "JetBrains Mono", "Fira Code", Consolas, "Courier New", monospace;
  --body: "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: var(--body); font-size: 16px; line-height: 1.65;
  overflow-x: hidden;
}
::selection { background: rgba(88, 166, 255, 0.35); }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: #484f58; }

#rainCanvas {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: 0.5;
}
.page { position: relative; z-index: 1; max-width: 1180px; margin: 0 auto; padding: 0 1.2rem 4rem; }

/* ---------- file:// 提示 ---------- */
.proto-bar {
  display: none; margin: 0.8rem 0 0; padding: 0.55rem 0.9rem;
  border: 1px solid var(--orange); border-radius: 8px;
  background: rgba(210, 153, 34, 0.1); color: var(--orange);
  font-family: var(--mono); font-size: 0.82rem;
}
.proto-bar.show { display: block; }
.proto-bar code { background: rgba(210, 153, 34, 0.2); padding: 0.05rem 0.35rem; border-radius: 4px; }

/* ---------- 頂欄 ---------- */
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.9rem 0; gap: 0.8rem; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 0.7rem; font-family: var(--mono); }
.brand .prompt { color: var(--green); font-weight: 800; font-size: 1.15rem; }
.brand .path { color: var(--blue); font-size: 0.95rem; }
.brand .cursor {
  display: inline-block; width: 9px; height: 1.15rem; background: var(--green);
  animation: blink 1s steps(1) infinite; vertical-align: text-bottom;
}
@keyframes blink { 50% { opacity: 0; } }
.lang-switch { display: flex; gap: 0.35rem; }
.lang-switch button {
  font-family: var(--mono); font-size: 0.82rem; font-weight: 600;
  background: var(--bg2); color: var(--muted); border: 1px solid var(--line);
  border-radius: 6px; padding: 0.32rem 0.75rem; cursor: pointer; transition: all 0.15s;
}
.lang-switch button:hover { border-color: var(--blue); color: var(--text); }
.lang-switch button.on { background: var(--blue); border-color: var(--blue); color: #0d1117; }

/* ---------- Hero 終端機 ---------- */
.hero { padding: 1.2rem 0 2rem; }
.terminal {
  background: var(--bg2); border: 1px solid var(--line); border-radius: 12px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5); overflow: hidden;
}
.term-titlebar {
  display: flex; align-items: center; gap: 0.45rem;
  background: var(--panel2); padding: 0.55rem 0.9rem; border-bottom: 1px solid var(--line);
}
.term-titlebar .dot { width: 12px; height: 12px; border-radius: 50%; }
.term-titlebar .dot.r { background: #ff5f57; }
.term-titlebar .dot.y { background: #febc2e; }
.term-titlebar .dot.g { background: #28c840; }
.term-titlebar .term-file {
  margin-left: 0.6rem; font-family: var(--mono); font-size: 0.78rem; color: var(--muted);
}
.term-body {
  padding: 1.1rem 1.2rem 1.3rem; font-family: var(--mono);
  font-size: clamp(0.82rem, 1.9vw, 0.98rem); min-height: 11.5rem;
}
.term-line { white-space: pre-wrap; word-break: break-all; margin: 0.18rem 0; }
.term-line .p { color: var(--green); }
.term-line .ok { color: var(--green); }
.term-line .cmd { color: var(--text); }
.term-line .dim { color: var(--muted); }
.term-line .warn { color: var(--orange); }
.term-line .accent { color: var(--purple); }
.term-line .blue { color: var(--blue); }

.hero-title {
  margin: 1.6rem 0 0.4rem; font-family: var(--mono); font-weight: 800;
  font-size: clamp(1.7rem, 5vw, 3rem); letter-spacing: 0.01em; line-height: 1.2;
}
.hero-title .ch { display: inline-block; opacity: 0; transform: translateY(0.4em); animation: chIn 0.4s forwards; }
.hero-title .ch.accent { color: var(--green); }
.hero-title .ch.accent2 { color: var(--blue); }
@keyframes chIn { to { opacity: 1; transform: none; } }
.hero-sub { color: var(--muted); font-size: clamp(0.95rem, 2.4vw, 1.1rem); max-width: 46rem; margin: 0.3rem 0 1rem; }
.hero-stats { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 0.9rem; }
.stat-chip {
  font-family: var(--mono); font-size: 0.82rem; color: var(--text);
  background: var(--bg2); border: 1px solid var(--line); border-radius: 999px;
  padding: 0.35rem 0.85rem;
}
.stat-chip b { color: var(--green); }
.scroll-hint {
  text-align: center; color: var(--muted); font-family: var(--mono);
  font-size: 0.8rem; margin: 1.4rem 0 0; animation: bob 1.8s ease-in-out infinite;
}
@keyframes bob { 50% { transform: translateY(5px); } }

/* ---------- 階段導航 ---------- */
.stage-nav {
  position: sticky; top: 0; z-index: 20; display: flex; flex-wrap: wrap; gap: 0.4rem;
  background: rgba(13, 17, 23, 0.92); backdrop-filter: blur(8px);
  padding: 0.7rem 0; border-bottom: 1px solid var(--line);
}
.stage-pill {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: var(--mono); font-size: 0.8rem; font-weight: 600;
  background: var(--bg2); color: var(--text); border: 1px solid var(--line);
  border-radius: 6px; padding: 0.35rem 0.7rem; cursor: pointer; transition: all 0.15s;
}
.stage-pill:hover { border-color: var(--blue); transform: translateY(-1px); }
.stage-pill .dot { width: 8px; height: 8px; border-radius: 2px; }
.stage-pill small { color: var(--muted); font-weight: 400; }

/* ---------- 搜尋 ---------- */
.search-row { margin: 1.4rem 0 0.4rem; position: relative; }
.search-row::before {
  content: "$ grep"; position: absolute; left: 0.9rem; top: 50%; transform: translateY(-50%);
  font-family: var(--mono); font-size: 0.88rem; color: var(--green); pointer-events: none;
}
#searchInput {
  width: 100%; background: var(--bg2); color: var(--text);
  border: 1px solid var(--line); border-radius: 8px;
  font-family: var(--mono); font-size: 0.95rem; padding: 0.7rem 1rem 0.7rem 5.2rem;
  outline: none; transition: border-color 0.15s, box-shadow 0.15s;
}
#searchInput:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.18); }
#searchInput::placeholder { color: #484f58; }
.no-result {
  display: none; text-align: center; color: var(--muted);
  font-family: var(--mono); padding: 2.5rem 0; font-size: 0.95rem;
}

/* ---------- 階段區塊 ---------- */
.stage-section { margin-top: 2.2rem; scroll-margin-top: 4.5rem; }
.stage-head { display: flex; align-items: baseline; gap: 0.7rem; flex-wrap: wrap; }
.stage-head .band {
  font-family: var(--mono); font-weight: 800; font-size: 0.8rem; color: #0d1117;
  border-radius: 5px; padding: 0.15rem 0.55rem;
}
.stage-head h2 { margin: 0; font-family: var(--mono); font-size: 1.3rem; font-weight: 800; }
.stage-head .range { color: var(--muted); font-family: var(--mono); font-size: 0.82rem; }
.stage-desc { color: var(--muted); margin: 0.35rem 0 1rem; font-size: 0.92rem; }

/* ---------- 課堂卡（檔案樹風） ---------- */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(255px, 1fr)); gap: 0.8rem; }
.lesson-card {
  position: relative; display: block; text-decoration: none; color: var(--text);
  background: var(--bg2); border: 1px solid var(--line); border-radius: 10px;
  padding: 0.85rem 0.95rem 0.8rem; overflow: hidden;
  opacity: 0; transform: translateY(14px);
  transition: opacity 0.45s ease var(--d, 0s), transform 0.45s ease var(--d, 0s),
              border-color 0.15s, box-shadow 0.15s;
}
.lesson-card.in { opacity: 1; transform: none; }
.lesson-card:hover { border-color: var(--stage, var(--blue)); box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45); }
.lesson-card .tree-line {
  font-family: var(--mono); font-size: 0.78rem; color: var(--muted);
  display: flex; align-items: center; gap: 0.45rem; margin-bottom: 0.5rem;
}
.lesson-card .tree-line .prompt { color: var(--stage, var(--green)); font-weight: 700; }
.lesson-card .tree-line .folder-name { color: var(--blue); word-break: break-all; }
.lesson-card .card-main { display: flex; gap: 0.65rem; align-items: flex-start; }
.lesson-card .icon { font-size: 1.5rem; line-height: 1.2; }
.lesson-card .card-title { font-weight: 700; font-size: 1.02rem; line-height: 1.35; }
.lesson-card .card-desc { color: var(--muted); font-size: 0.84rem; margin-top: 0.2rem; }
.lesson-card .card-foot {
  display: flex; justify-content: space-between; align-items: center; margin-top: 0.65rem;
}
.lesson-card .badge {
  font-family: var(--mono); font-size: 0.72rem; font-weight: 700;
  color: var(--stage, var(--green)); border: 1px solid var(--stage, var(--green));
  border-radius: 4px; padding: 0.08rem 0.4rem;
}
.lesson-card .go { font-family: var(--mono); font-size: 0.78rem; color: var(--green); }
.lesson-card.soon { filter: grayscale(0.9); opacity: 0; }
.lesson-card.soon.in { opacity: 0.55; }
.lesson-card.soon:hover { border-color: var(--line); box-shadow: none; cursor: not-allowed; }
.lesson-card .soon-tag {
  font-family: var(--mono); font-size: 0.72rem; color: var(--orange);
  border: 1px dashed var(--orange); border-radius: 4px; padding: 0.08rem 0.4rem;
}

/* ---------- 老師面板 ---------- */
.teacher-panel {
  display: none; margin-top: 2.6rem; background: var(--bg2);
  border: 1px solid var(--orange); border-radius: 12px; padding: 1.1rem 1.2rem;
}
.teacher-panel.show { display: block; }
.teacher-panel h2 { margin: 0 0 0.3rem; font-family: var(--mono); color: var(--orange); font-size: 1.15rem; }
.teacher-panel .tip { color: var(--muted); font-size: 0.85rem; margin: 0 0 0.9rem; }
.teacher-table-wrap { overflow-x: auto; }
.teacher-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.teacher-table th, .teacher-table td {
  text-align: left; padding: 0.45rem 0.6rem; border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.teacher-table th { font-family: var(--mono); color: var(--muted); font-weight: 600; font-size: 0.78rem; }
.teacher-table a { color: var(--blue); text-decoration: none; font-family: var(--mono); font-size: 0.82rem; }
.teacher-table a:hover { text-decoration: underline; }
.teacher-table .t-link { color: var(--orange); }
.teacher-table .stage-cell { font-size: 0.78rem; border-radius: 4px; }
.teacher-table .soon-cell { color: #484f58; font-family: var(--mono); font-size: 0.8rem; }

/* ---------- footer ---------- */
.footer {
  margin-top: 3.5rem; padding-top: 1.2rem; border-top: 1px solid var(--line);
  color: var(--muted); font-family: var(--mono); font-size: 0.78rem; text-align: center;
}
.footer .sig { color: var(--green); }

@media (max-width: 640px) {
  .term-body { min-height: 13rem; }
  .card-grid { grid-template-columns: 1fr; }
  .stage-nav { position: static; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}