/* ==========================================================================
   Claude Certified Architect – Foundations · 中文备考指南
   清新明亮风格：浅蓝、浅绿、米白、淡灰
   ========================================================================== */

:root {
  --c-bg: #f7fafc;
  --c-bg-card: #ffffff;
  --c-bg-soft: #f1f5f9;
  --c-text: #1f2937;
  --c-text-soft: #475569;
  --c-text-muted: #94a3b8;
  --c-border: #e2e8f0;
  --c-border-soft: #edf2f7;
  --c-primary: #3b82f6;
  --c-primary-soft: #dbeafe;
  --c-primary-dark: #1d4ed8;
  --c-accent: #10b981;
  --c-accent-soft: #d1fae5;
  --c-warning: #f59e0b;
  --c-warning-soft: #fef3c7;
  --c-danger: #ef4444;
  --c-danger-soft: #fee2e2;
  --c-purple: #8b5cf6;
  --c-purple-soft: #ede9fe;
  --c-shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 4px 12px rgba(15, 23, 42, 0.04);
  --c-shadow-hover: 0 4px 8px rgba(15, 23, 42, 0.08), 0 8px 24px rgba(15, 23, 42, 0.06);
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --max-width: 1180px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--c-primary-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { color: #0f172a; font-weight: 600; line-height: 1.3; }
h1 { font-size: 2.1rem; margin: 0 0 0.5rem; }
h2 { font-size: 1.6rem; margin: 0 0 1rem; padding-top: 0.5rem; }
h3 { font-size: 1.2rem; margin: 1.4rem 0 0.5rem; }
h4 { font-size: 1.05rem; margin: 1.2rem 0 0.4rem; }
p { margin: 0.6rem 0; }
code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--c-bg-soft);
  padding: 1px 6px;
  border-radius: 4px;
  color: #be185d;
}
pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 14px 16px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.5;
}
pre code { background: transparent; padding: 0; color: inherit; }

/* ---------- Top nav ---------- */
.topnav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-border);
}
.topnav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 10px 24px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.brand {
  font-weight: 600;
  color: #0f172a;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.brand-mark {
  width: 28px; height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, #3b82f6 0%, #10b981 100%);
  color: white;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 0.78rem;
  font-weight: 700;
}
.nav-links {
  display: flex; gap: 4px; flex-wrap: wrap;
  margin-left: auto;
}
.nav-links a {
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--c-text-soft);
}
.nav-links a:hover {
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
  text-decoration: none;
}

/* ---------- Layout ---------- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, #eff6ff 0%, #ecfdf5 100%);
  padding: 60px 0 56px;
  border-bottom: 1px solid var(--c-border-soft);
}
.hero-eyebrow {
  display: inline-block;
  background: white;
  border: 1px solid var(--c-border);
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--c-text-soft);
  margin-bottom: 18px;
}
.hero h1 {
  font-size: 2.4rem;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}
.hero-sub {
  font-size: 1.12rem;
  color: var(--c-text-soft);
  max-width: 760px;
  margin-bottom: 28px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}
.hero-meta-item {
  background: white;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: 0.88rem;
  min-width: 200px;
}
.hero-meta-item .k {
  font-size: 0.74rem;
  color: var(--c-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}
.hero-meta-item .v { color: #0f172a; font-weight: 500; }
.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: var(--radius);
  font-size: 0.92rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
}
.btn-primary {
  background: var(--c-primary);
  color: white;
}
.btn-primary:hover { background: var(--c-primary-dark); text-decoration: none; }
.btn-ghost {
  background: white;
  border-color: var(--c-border);
  color: var(--c-text);
}
.btn-ghost:hover { border-color: var(--c-primary); color: var(--c-primary-dark); text-decoration: none; }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------- Section ---------- */
section { padding: 56px 0; }
section + section { border-top: 1px solid var(--c-border-soft); }
.section-tag {
  display: inline-block;
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
  margin-bottom: 8px;
}

/* ---------- Cards ---------- */
.card {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--c-shadow);
  transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover { box-shadow: var(--c-shadow-hover); }
.card h3 { margin-top: 0; }
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

/* ---------- Domain tabs ---------- */
.domain-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.domain-tab {
  flex: 1 1 180px;
  background: white;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 12px 14px;
  cursor: pointer;
  font-size: 0.92rem;
  color: var(--c-text-soft);
  text-align: left;
  transition: all 0.15s;
}
.domain-tab:hover { border-color: var(--c-primary); color: var(--c-primary-dark); }
.domain-tab.active {
  background: var(--c-primary);
  color: white;
  border-color: var(--c-primary);
}
.domain-tab .weight {
  display: inline-block;
  background: var(--c-accent-soft);
  color: #047857;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 999px;
  margin-left: 6px;
  vertical-align: middle;
}
.domain-tab.active .weight { background: rgba(255,255,255,0.25); color: white; }
.domain-panel { display: none; }
.domain-panel.active { display: block; }
.domain-panel .panel-inner {
  background: white;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--c-shadow);
}
.domain-panel h4 { color: var(--c-primary-dark); margin-top: 18px; }
.domain-panel h4:first-child { margin-top: 0; }
.bullet-list { padding-left: 22px; }
.bullet-list li { margin: 4px 0; }

/* ---------- Tables ---------- */
.tbl-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--c-border); }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  background: white;
}
th, td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--c-border-soft);
}
th {
  background: var(--c-bg-soft);
  font-weight: 600;
  color: #334155;
  font-size: 0.85rem;
  white-space: nowrap;
}
tbody tr:hover { background: #fafbff; }
tbody tr:last-child td { border-bottom: none; }

/* ---------- Roadmap ---------- */
.roadmap-switcher {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}
.roadmap-switcher button {
  flex: 1 1 180px;
  background: white;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 12px 16px;
  cursor: pointer;
  text-align: left;
  transition: all 0.15s;
}
.roadmap-switcher button:hover { border-color: var(--c-primary); }
.roadmap-switcher button.active {
  background: var(--c-accent);
  color: white;
  border-color: var(--c-accent);
}
.roadmap-switcher button .ttl { font-weight: 600; font-size: 0.95rem; }
.roadmap-switcher button .meta { font-size: 0.78rem; opacity: 0.8; margin-top: 2px; }
.roadmap-panel { display: none; }
.roadmap-panel.active { display: block; }

.timeline { padding-left: 0; list-style: none; counter-reset: step; }
.timeline li {
  position: relative;
  padding: 14px 14px 14px 50px;
  background: white;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  margin-bottom: 10px;
  counter-increment: step;
}
.timeline li::before {
  content: counter(step);
  position: absolute;
  left: 14px; top: 14px;
  width: 26px; height: 26px;
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.82rem; font-weight: 600;
}
.timeline li b { color: var(--c-primary-dark); }

/* ---------- Tutorial ---------- */
.tutorial {
  background: white;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 22px;
  margin-bottom: 16px;
  box-shadow: var(--c-shadow);
}
.tutorial .tut-num {
  display: inline-block;
  background: var(--c-purple-soft);
  color: var(--c-purple);
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.tutorial .one-liner {
  background: var(--c-bg-soft);
  border-left: 3px solid var(--c-accent);
  padding: 10px 14px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.95rem;
  margin: 10px 0;
  color: #334155;
}
.tutorial .grid-3 .card { background: var(--c-bg-soft); border: 1px solid var(--c-border-soft); box-shadow: none; }
.tutorial .do-dont {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 12px 0;
}
.tutorial .do-dont .do {
  background: var(--c-accent-soft);
  border-left: 3px solid var(--c-accent);
  padding: 10px 12px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.92rem;
}
.tutorial .do-dont .dont {
  background: var(--c-danger-soft);
  border-left: 3px solid var(--c-danger);
  padding: 10px 12px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.92rem;
}
.tutorial .exercise {
  background: var(--c-warning-soft);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.9rem;
  margin-top: 10px;
}
.tutorial .exercise b { color: #92400e; }

@media (max-width: 640px) {
  .tutorial .do-dont { grid-template-columns: 1fr; }
}

/* ---------- Labs ---------- */
.lab {
  background: white;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--c-shadow);
}
.lab-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 12px;
}
.lab-tag {
  background: var(--c-accent);
  color: white;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 600;
}
.lab-meta {
  display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0;
}
.lab-chip {
  background: var(--c-bg-soft);
  border: 1px solid var(--c-border);
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  color: var(--c-text-soft);
}

/* ---------- Resources table filters ---------- */
.filter-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
  align-items: center;
}
.filter-row label {
  font-size: 0.85rem;
  color: var(--c-text-soft);
}
.filter-row select, .filter-row input {
  padding: 6px 10px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  background: white;
  font-family: inherit;
}

/* ---------- Mock Qs ---------- */
.mock {
  background: white;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.mock-summary {
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 10px;
}
.mock-summary::-webkit-details-marker { display: none; }
.mock-summary::before {
  content: "Q";
  display: inline-flex;
  width: 26px; height: 26px;
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
  border-radius: 50%;
  align-items: center; justify-content: center;
  font-size: 0.78rem; font-weight: 700;
  flex-shrink: 0;
}
.mock[open] .mock-summary::before { background: var(--c-primary); color: white; }
.mock-body {
  padding: 4px 18px 18px;
  font-size: 0.92rem;
  color: var(--c-text-soft);
}
.mock-body .ans {
  background: var(--c-accent-soft);
  border-left: 3px solid var(--c-accent);
  padding: 10px 14px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 10px 0;
  color: #065f46;
}
.mock-body .why {
  background: var(--c-bg-soft);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: var(--c-text);
}

/* ---------- Anti-patterns ---------- */
.anti-grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.anti {
  background: var(--c-danger-soft);
  border-left: 4px solid var(--c-danger);
  padding: 14px 16px;
  border-radius: var(--radius);
}
.anti h4 { margin: 0 0 6px; color: #991b1b; font-size: 1rem; }
.anti p { margin: 0; font-size: 0.9rem; color: #7f1d1d; }

/* ---------- Personal plan ---------- */
.plan-tree {
  background: #0f172a;
  color: #e2e8f0;
  padding: 18px 22px;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.7;
  white-space: pre;
  overflow-x: auto;
}

/* ---------- Prompts ---------- */
.prompt-card {
  background: white;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 12px;
  position: relative;
}
.prompt-card h4 { margin: 0 0 6px; }
.prompt-card pre {
  background: var(--c-bg-soft);
  color: var(--c-text);
  font-size: 0.85rem;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  white-space: pre-wrap;
  margin: 8px 0 0;
}
.copy-btn {
  position: absolute;
  top: 14px;
  right: 14px;
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
  border: none;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  cursor: pointer;
  font-weight: 500;
}
.copy-btn:hover { background: var(--c-primary); color: white; }
.copy-btn.copied { background: var(--c-accent); color: white; }

/* ---------- Checklist ---------- */
.check-list { list-style: none; padding-left: 0; }
.check-list li {
  padding: 6px 0;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.check-list input[type="checkbox"] {
  margin-top: 5px;
  width: 16px; height: 16px;
  cursor: pointer;
  accent-color: var(--c-accent);
}
.check-list label { cursor: pointer; font-size: 0.94rem; }
.check-list input:checked + label {
  text-decoration: line-through;
  color: var(--c-text-muted);
}
.progress-bar {
  height: 8px;
  background: var(--c-bg-soft);
  border-radius: 999px;
  overflow: hidden;
  margin: 8px 0 16px;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  width: 0%;
  transition: width 0.3s ease;
}

/* ---------- Source boundary tags ---------- */
.tag {
  display: inline-block;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 500;
  vertical-align: middle;
}
.tag-official { background: var(--c-primary-soft); color: var(--c-primary-dark); }
.tag-community { background: var(--c-warning-soft); color: #92400e; }
.tag-docs { background: var(--c-accent-soft); color: #065f46; }
.tag-course { background: var(--c-purple-soft); color: #5b21b6; }

/* ---------- Footer / Sources ---------- */
footer {
  background: var(--c-bg-soft);
  padding: 40px 0 60px;
  margin-top: 40px;
  border-top: 1px solid var(--c-border);
  font-size: 0.9rem;
  color: var(--c-text-soft);
}
footer h2 { color: #0f172a; }
footer .src-section { margin-top: 24px; }
footer .src-section h3 { font-size: 1.05rem; margin-bottom: 8px; }

/* ---------- Back to top ---------- */
#backToTop {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--c-primary);
  color: white;
  border: none;
  cursor: pointer;
  font-size: 1.2rem;
  box-shadow: var(--c-shadow-hover);
  display: none;
  z-index: 40;
}
#backToTop:hover { background: var(--c-primary-dark); }
#backToTop.show { display: block; }

/* ---------- Print ---------- */
@media print {
  body { background: white; font-size: 11.5pt; }
  .topnav, #backToTop, .btn-row, .filter-row, .copy-btn { display: none !important; }
  section { padding: 16px 0; border-top: 1px solid #ddd; page-break-inside: avoid; }
  .card, .tutorial, .lab, .mock { box-shadow: none; border: 1px solid #ddd; page-break-inside: avoid; }
  .mock-body { display: block !important; }
  pre { background: #f5f5f5 !important; color: #1f2937 !important; page-break-inside: avoid; }
  a { color: #1d4ed8; text-decoration: underline; }
  footer { background: white; }
  h2, h3 { page-break-after: avoid; }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .hero { padding: 40px 0; }
  .hero h1 { font-size: 1.85rem; }
  .hero-sub { font-size: 1rem; }
  .hero-meta { flex-direction: column; }
  .hero-meta-item { min-width: 0; width: 100%; }
  .container { padding: 0 16px; }
  section { padding: 40px 0; }
  h2 { font-size: 1.35rem; }
  h1 { font-size: 1.7rem; }
  .domain-tab { flex: 1 1 100%; }
  .nav-links { gap: 0; }
  .nav-links a { padding: 4px 6px; font-size: 0.8rem; }
  .brand { font-size: 0.9rem; }
}

/* ---------- Misc ---------- */
hr { border: 0; border-top: 1px dashed var(--c-border); margin: 22px 0; }
.callout {
  background: var(--c-warning-soft);
  border-left: 4px solid var(--c-warning);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  margin: 14px 0;
}
.callout b { color: #92400e; }
.kbd {
  display: inline-block;
  background: white;
  border: 1px solid var(--c-border);
  border-bottom-width: 2px;
  padding: 1px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.85em;
}