/* 網路安全技術人員證書 — Learning Site */
:root {
  --bg: #0b1220;
  --bg2: #121a2b;
  --bg3: #1a2438;
  --card: #162033;
  --card-hover: #1c2a42;
  --border: #2a3b55;
  --border-soft: #243349;
  --text: #e8eef6;
  --muted: #93a4bc;
  --accent: #3b9eff;
  --accent2: #5eead4;
  --accent3: #a78bfa;
  --warn: #fbbf24;
  --danger: #f87171;
  --ok: #34d399;
  --orange: #fb923c;
  --pink: #f472b6;
  --radius: 14px;
  --shadow: 0 8px 32px rgba(0,0,0,.35);
  --sidebar-w: 280px;
  --font: "Noto Sans TC", "Microsoft JhengHei", "PingFang TC", "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "SF Mono", Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.en {
  color: var(--accent2);
  font-weight: 600;
  font-size: 0.95em;
  white-space: nowrap;
}
.tag {
  display: inline-block;
  padding: 0.15em 0.55em;
  border-radius: 999px;
  background: rgba(59,158,255,.15);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  margin-right: 0.35rem;
}

/* Layout */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  background: linear-gradient(180deg, var(--bg2), #0e1626);
  border-right: 1px solid var(--border);
  padding: 1.1rem 0.9rem 2rem;
  z-index: 40;
}
.brand {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  padding: 0.4rem 0.5rem 1rem;
  border-bottom: 1px solid var(--border-soft);
  margin-bottom: 0.85rem;
}
.brand-badge {
  width: 42px; height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent3));
  display: grid; place-items: center;
  font-weight: 800; font-size: 0.85rem; color: #fff;
  flex-shrink: 0;
}
.brand h1 {
  font-size: 0.95rem;
  line-height: 1.35;
  font-weight: 700;
}
.brand p {
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 0.15rem;
}

.nav-group { margin-bottom: 0.85rem; }
.nav-label {
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0.35rem 0.55rem;
  font-weight: 700;
}
.nav-btn {
  width: 100%;
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text);
  padding: 0.55rem 0.65rem;
  border-radius: 10px;
  cursor: pointer;
  font: inherit;
  font-size: 0.88rem;
  display: flex;
  gap: 0.55rem;
  align-items: flex-start;
  transition: .15s ease;
  margin-bottom: 0.2rem;
}
.nav-btn:hover { background: var(--bg3); border-color: var(--border-soft); }
.nav-btn.active {
  background: rgba(59,158,255,.14);
  border-color: rgba(59,158,255,.45);
  color: #fff;
}
.nav-btn .num {
  flex-shrink: 0;
  width: 1.55rem; height: 1.55rem;
  border-radius: 8px;
  background: var(--bg3);
  display: grid; place-items: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent2);
}
.nav-btn.active .num { background: var(--accent); color: #fff; }
.nav-btn .done-dot {
  margin-left: auto;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--ok);
  opacity: 0;
  align-self: center;
}
.nav-btn.done .done-dot { opacity: 1; }

.progress-mini {
  margin: 0.6rem 0.4rem 1rem;
  padding: 0.75rem;
  background: var(--bg3);
  border-radius: 12px;
  border: 1px solid var(--border-soft);
}
.progress-mini .row {
  display: flex; justify-content: space-between;
  font-size: 0.78rem; color: var(--muted); margin-bottom: 0.4rem;
}
.bar {
  height: 8px; background: #0b1220; border-radius: 999px; overflow: hidden;
}
.bar > span {
  display: block; height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--accent2), var(--accent));
  transition: width .35s ease;
}

.main {
  min-width: 0;
  padding: 1.25rem 1.5rem 3rem;
  max-width: 1100px;
}
.topbar {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}
.menu-toggle {
  display: none;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 0.45rem 0.7rem;
  cursor: pointer;
  font: inherit;
}
.breadcrumb {
  color: var(--muted);
  font-size: 0.85rem;
}
.disclaimer {
  margin-top: 2rem;
  padding: 1rem 1.15rem;
  border-radius: var(--radius);
  border: 1px dashed var(--border);
  background: rgba(251,191,36,.06);
  color: var(--muted);
  font-size: 0.85rem;
}
.disclaimer strong { color: var(--warn); }

.view { display: none; animation: fade .25s ease; }
.view.active { display: block; }
@keyframes fade {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

.hero {
  background:
    radial-gradient(ellipse at top right, rgba(59,158,255,.18), transparent 50%),
    radial-gradient(ellipse at bottom left, rgba(94,234,212,.1), transparent 45%),
    var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.75rem 1.6rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.25rem;
}
.hero h2 {
  font-size: 1.65rem;
  margin-bottom: 0.5rem;
  line-height: 1.35;
}
.hero p { color: var(--muted); max-width: 58ch; }
.hero-actions {
  display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.1rem;
}

.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  border: 1px solid var(--border);
  background: var(--bg3);
  color: var(--text);
  padding: 0.55rem 0.95rem;
  border-radius: 10px;
  cursor: pointer;
  font: inherit;
  font-size: 0.9rem;
  transition: .15s ease;
}
.btn:hover { border-color: var(--accent); background: var(--card-hover); }
.btn.primary {
  background: linear-gradient(135deg, #2f7fe0, #3b9eff);
  border-color: transparent;
  color: #fff;
  font-weight: 600;
}
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; }
.btn.ok { background: rgba(52,211,153,.15); border-color: rgba(52,211,153,.4); color: var(--ok); }
.btn.warn { background: rgba(251,191,36,.12); border-color: rgba(251,191,36,.35); color: var(--warn); }

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.9rem;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.85rem;
}
@media (max-width: 980px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.15rem;
  transition: .15s ease;
}
.card:hover { border-color: rgba(59,158,255,.35); }
.card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.45rem;
  display: flex; align-items: center; gap: 0.45rem;
}
.card p, .card li { color: var(--muted); font-size: 0.92rem; }
.card ul { padding-left: 1.15rem; }
.card li { margin: 0.25rem 0; }
.card.clickable { cursor: pointer; }
.card.clickable:hover { background: var(--card-hover); transform: translateY(-1px); }
.chap-num {
  display: inline-grid; place-items: center;
  min-width: 2rem; height: 1.6rem; padding: 0 0.4rem;
  border-radius: 8px;
  background: rgba(94,234,212,.12);
  color: var(--accent2);
  font-size: 0.75rem; font-weight: 700;
}

.section-head {
  margin: 0.5rem 0 1rem;
}
.section-head h2 {
  font-size: 1.55rem;
  margin-bottom: 0.35rem;
}
.section-head p { color: var(--muted); }

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem 1.25rem;
  margin-bottom: 1rem;
}
.panel h3 {
  font-size: 1.05rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-soft);
  display: flex; align-items: center; gap: 0.5rem;
}
.panel h3 .icon { font-size: 1.1rem; }
.bullets {
  list-style: none;
  display: grid; gap: 0.55rem;
}
.bullets li {
  position: relative;
  padding: 0.65rem 0.85rem 0.65rem 2.4rem;
  background: var(--bg3);
  border-radius: 10px;
  border: 1px solid var(--border-soft);
  color: var(--text);
  font-size: 0.92rem;
}
.bullets li::before {
  content: attr(data-n);
  position: absolute; left: 0.65rem; top: 0.65rem;
  width: 1.35rem; height: 1.35rem;
  border-radius: 7px;
  background: rgba(59,158,255,.2);
  color: var(--accent);
  font-size: 0.72rem; font-weight: 700;
  display: grid; place-items: center;
}

.explain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.85rem;
}
.explain {
  background: var(--bg3);
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  padding: 0.95rem 1rem;
}
.explain h4 {
  font-size: 0.95rem;
  margin-bottom: 0.35rem;
  color: #fff;
}
.explain p { color: var(--muted); font-size: 0.88rem; }

.mindmap-wrap {
  overflow-x: auto;
  background: #0a101c;
  border-radius: 12px;
  border: 1px solid var(--border-soft);
  padding: 0.75rem;
}
.mindmap-wrap svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }
.mm-node { fill: #1a2740; stroke: #3b9eff; stroke-width: 1.5; }
.mm-node-core { fill: #243656; stroke: #5eead4; stroke-width: 2; }
.mm-text { fill: #e8eef6; font-family: var(--font); font-size: 12px; }
.mm-text-sm { fill: #93a4bc; font-family: var(--font); font-size: 10.5px; }
.mm-line { stroke: #3a4f6e; stroke-width: 1.5; fill: none; }

.mm-caption {
  margin: 0.85rem 0 0.15rem;
  padding: 0.75rem 0.9rem;
  background: rgba(59,158,255,0.08);
  border: 1px solid rgba(59,158,255,0.25);
  border-radius: 10px;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.55;
}
.mm-caption strong { color: var(--accent2, #5eead4); }
.mm-band-text {
  fill: #7dd3fc;
  font-family: var(--font);
  font-size: 11px;
  font-weight: 600;
}

/* Quiz */
.quiz-box { margin-top: 0.5rem; }
.q-card {
  background: var(--bg3);
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  margin-bottom: 0.85rem;
}
.q-card .q-meta {
  font-size: 0.75rem; color: var(--muted); margin-bottom: 0.35rem;
}
.q-card .q-text { font-weight: 600; margin-bottom: 0.7rem; }
.options { display: grid; gap: 0.45rem; }
.opt {
  text-align: left;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.6rem 0.8rem;
  border-radius: 10px;
  cursor: pointer;
  font: inherit;
  font-size: 0.9rem;
  transition: .12s ease;
}
.opt:hover:not(:disabled) { border-color: var(--accent); }
.opt.correct { border-color: var(--ok); background: rgba(52,211,153,.12); }
.opt.wrong { border-color: var(--danger); background: rgba(248,113,113,.1); }
.opt:disabled { cursor: default; opacity: 0.95; }
.feedback {
  margin-top: 0.55rem;
  font-size: 0.88rem;
  padding: 0.55rem 0.7rem;
  border-radius: 8px;
}
.feedback.ok { background: rgba(52,211,153,.1); color: var(--ok); }
.feedback.bad { background: rgba(248,113,113,.1); color: var(--danger); }
.score-banner {
  display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  background: linear-gradient(90deg, rgba(59,158,255,.12), rgba(94,234,212,.08));
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 1rem;
}

/* Games */
.game-tabs {
  display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1rem;
}
.flash-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.85rem;
}
.flash {
  perspective: 900px;
  height: 140px;
  cursor: pointer;
}
.flash-inner {
  position: relative; width: 100%; height: 100%;
  transition: transform .45s;
  transform-style: preserve-3d;
}
.flash.flipped .flash-inner { transform: rotateY(180deg); }
.flash-face {
  position: absolute; inset: 0;
  backface-visibility: hidden;
  border-radius: 12px;
  border: 1px solid var(--border);
  display: grid; place-items: center;
  padding: 0.85rem;
  text-align: center;
  font-size: 0.92rem;
  font-weight: 600;
}
.flash-front { background: linear-gradient(160deg, #1a2b45, #152238); color: var(--accent2); }
.flash-back {
  background: linear-gradient(160deg, #1e2438, #162033);
  color: var(--text);
  transform: rotateY(180deg);
  font-weight: 500;
  font-size: 0.85rem;
  line-height: 1.45;
}

.match-board {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 700px) { .match-board { grid-template-columns: 1fr; } }
.match-col h4 { margin-bottom: 0.55rem; font-size: 0.9rem; color: var(--muted); }
.match-item {
  display: block; width: 100%;
  text-align: left;
  margin-bottom: 0.45rem;
  padding: 0.65rem 0.8rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg3);
  color: var(--text);
  font: inherit;
  cursor: pointer;
}
.match-item.selected { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(59,158,255,.25); }
.match-item.matched { opacity: 0.45; border-color: var(--ok); pointer-events: none; }
.match-item.bad-flash { animation: shake .35s ease; border-color: var(--danger); }
@keyframes shake {
  0%,100% { transform: none; }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

.osi-board {
  display: grid;
  gap: 0.45rem;
  max-width: 520px;
}
.osi-layer {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.7rem 0.9rem;
  border-radius: 10px;
  border: 1px dashed var(--border);
  background: var(--bg3);
  cursor: pointer;
  min-height: 52px;
  transition: .12s;
}
.osi-layer:hover { border-style: solid; border-color: var(--accent); }
.osi-layer.filled {
  border-style: solid;
  border-color: rgba(94,234,212,.45);
  background: rgba(94,234,212,.08);
}
.osi-layer .slot {
  flex: 1; font-weight: 600;
}
.osi-layer .n {
  width: 1.6rem; height: 1.6rem; border-radius: 8px;
  background: var(--card); display: grid; place-items: center;
  font-size: 0.75rem; color: var(--accent2); font-weight: 700;
}
.chip-bank {
  display: flex; flex-wrap: wrap; gap: 0.45rem;
  margin: 0.85rem 0 1rem;
}
.chip {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  cursor: grab;
  font: inherit;
  font-size: 0.85rem;
}
.chip.used { opacity: 0.35; pointer-events: none; }
.chip.picked { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(59,158,255,.25); }

.status-line {
  font-size: 0.88rem; color: var(--muted); margin-top: 0.75rem;
}

.overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 50;
}
.overlay.show { display: block; }
.sidebar.open { transform: translateX(0); }

@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    left: 0; top: 0;
    width: min(86vw, 300px);
    transform: translateX(-105%);
    transition: transform .25s ease;
    box-shadow: var(--shadow);
  }
  .sidebar.open { transform: translateX(0); }
  .menu-toggle { display: inline-flex; }
  .main { padding: 1rem 0.95rem 2.5rem; }
}

/* ——— Upgrade: glossary, pitfalls, game extras ——— */
.search-input {
  flex: 1;
  min-width: 220px;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 0.65rem 0.9rem;
  font: inherit;
  font-size: 0.92rem;
}
.search-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(59,158,255,.2);
}
.gloss-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.65rem;
}
.gloss-item {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.75rem 0.9rem;
}
.gloss-term {
  color: var(--accent2);
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.35rem;
}
.gloss-def {
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.5;
}
.pitfalls {
  border-color: rgba(251,191,36,.35);
  background: linear-gradient(160deg, rgba(251,191,36,.06), transparent);
}
.warn-bullets li::before { color: var(--warn) !important; content: "!" !important; font-weight: 800; }
.game-subtabs {
  display: flex; flex-wrap: wrap; gap: 0.5rem;
  margin-bottom: 0.85rem;
}
.btn.primary, .btn.primary:hover {
  background: linear-gradient(135deg, var(--accent), #6366f1);
  border-color: transparent;
  color: #fff;
}
.btn.ghost {
  background: transparent;
  border-color: var(--border);
}
.btn.warn {
  background: rgba(251,191,36,.12);
  border-color: rgba(251,191,36,.4);
  color: var(--warn);
}
.score-banner, .score-banner {
  display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  background: linear-gradient(90deg, rgba(59,158,255,.12), rgba(94,234,212,.08));
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 1rem;
}
.q-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 0.75rem;
}
.q-meta { font-size: 0.75rem; color: var(--muted); margin-bottom: 0.35rem; }
.q-text { font-weight: 600; margin-bottom: 0.7rem; }
.tag {
  display: inline-block;
  padding: 0.15em 0.55em;
  border-radius: 999px;
  background: rgba(59,158,255,.15);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  margin-left: 0.35rem;
}
.chip-bank, .chip-bank {
  display: flex; flex-wrap: wrap; gap: 0.45rem;
  margin: 0.85rem 0 1rem;
}
.chip {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  font-size: 0.85rem;
}
.chip.used { opacity: 0.35; pointer-events: none; }
.chip.picked { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(59,158,255,.25); }
.osi-board {
  display: grid; gap: 0.45rem; max-width: 560px;
}
.osi-layer {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.7rem 0.9rem;
  border-radius: 10px;
  border: 1px dashed var(--border);
  background: var(--bg3);
  cursor: pointer;
  min-height: 52px;
}
.osi-layer:hover { border-style: solid; border-color: var(--accent); }
.osi-layer.filled {
  border-style: solid;
  border-color: rgba(94,234,212,.45);
  background: rgba(94,234,212,.08);
}
.osi-layer .n {
  width: 1.6rem; height: 1.6rem; border-radius: 8px;
  background: var(--card); display: grid; place-items: center;
  font-size: 0.75rem; color: var(--accent2); font-weight: 700;
}
.osi-layer .slot { flex: 1; font-weight: 600; }
.done-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--ok); opacity: 0; margin-left: auto;
}
.nav-btn.done .done-dot { opacity: 1; }
.breadcrumb { color: var(--muted); font-size: 0.9rem; font-weight: 500; }
.mm-text-sm { fill: #93a4bc; font-family: var(--font); font-size: 10.5px; }


/* Embedded frameworks / poster */
.embed-panel { padding: 0; overflow: hidden; }
.embed-frame {
  width: 100%;
  height: min(78vh, 900px);
  border: 0;
  display: block;
  background: #0f1419;
  border-radius: 0 0 12px 12px;
}