/* ═══════════════════════════════════════════════
   Plain Vanilla Web — 全局設計系統 v2.0
   設計哲學：專業深色質感 + 清晰層次 + 零框架依賴
   ═══════════════════════════════════════════════ */

/* ── Design Tokens ── */
:root {
  /* 主色系：從工程師藍升級為深邃藍紫系 */
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-subtle: rgba(37, 99, 235, 0.1);
  --accent-color: #7c3aed;

  /* 語意狀態色 */
  --success: #10b981;
  --success-subtle: #f0fdf4;
  --danger: #ef4444;
  --danger-subtle: #fef2f2;
  --warning: #f59e0b;
  --warning-subtle: #fffbeb;

  /* 中性色系 */
  --bg-color: #ffffff;
  --surface-color: #f8fafc;
  --border-color: #e2e8f0;
  --text-color: #1e293b;
  --text-muted: #64748b;
  --text-subtle: #94a3b8;

  /* Sidebar */
  --nav-bg: #ffffff;
  --nav-width: 260px;

  /* 卡片 */
  --card-bg: #ffffff;
  --card-border: #e2e8f0;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
  --card-shadow-hover: 0 10px 30px rgba(0, 0, 0, 0.12);

  /* 間距 */
  --spacing-unit: 1rem;
  --border-radius: 10px;
  --border-radius-lg: 16px;
}

/* ── Dark Mode ── */
[data-theme="dark"] {
  --bg-color: #0a0f1a;
  --surface-color: #0f172a;
  --border-color: rgba(255, 255, 255, 0.08);
  --text-color: #e2e8f0;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;
  --primary-color: #60a5fa;
  --primary-hover: #93c5fd;
  --primary-subtle: rgba(96, 165, 250, 0.12);
  --card-bg: #111827;
  --card-border: rgba(255, 255, 255, 0.07);
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  --card-shadow-hover: 0 10px 30px rgba(0, 0, 0, 0.4);
  --nav-bg: #060b14;

  /* 語意狀態色 (dark：調亮一階以維持對比) */
  --success: #34d399;
  --success-subtle: rgba(16, 185, 129, 0.14);
  --danger: #f87171;
  --danger-subtle: rgba(239, 68, 68, 0.14);
  --warning: #fbbf24;
  --warning-subtle: rgba(245, 158, 11, 0.14);
}

[data-theme="dark"] .navbar {
  border-right-color: rgba(255, 255, 255, 0.04);
}

/* ── Reset & Base ── */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  line-height: 1.7;
  font-size: 16px;
  transition: background-color 0.3s, color 0.3s;
}

img,
video,
canvas,
svg {
  max-width: 100%;
}

/* ── Code 元素全局樣式 ── */
code {
  font-family: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  font-size: 0.875em;
  background: #eff6ff;
  color: #1d4ed8;
  padding: 0.15em 0.45em;
  border-radius: 5px;
  border: 1px solid #bfdbfe;
  font-weight: 500;
  white-space: nowrap;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
  white-space: pre;
}

pre {
  font-family: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.25rem;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-color);
}

[data-theme="dark"] code {
  background: #1e3a5f;
  color: #93c5fd;
  border-color: #1e40af;
}

/* ── Markdown 渲染元素（doc-service 生成） ── */
.md-inline-code {
  /* 繼承全局 code 樣式，此 class 確保深色模式 override 可以命中 */
  font-family: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  font-size: 0.875em;
  background: #eff6ff;
  color: #1d4ed8;
  padding: 0.15em 0.45em;
  border-radius: 5px;
  border: 1px solid #bfdbfe;
  font-weight: 500;
  white-space: nowrap;
}

[data-theme="dark"] .md-inline-code {
  background: #1e3a5f;
  color: #93c5fd;
  border-color: #1e40af;
}

.md-code-block {
  background: #1e1e2e;
  color: #cdd6f4;
  padding: 1.25rem;
  border-radius: 10px;
  overflow-x: auto;
  font-family: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 1rem 0;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .md-code-block {
  background: #11131d;
  border-color: rgba(255, 255, 255, 0.06);
}

.md-code-block code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
  white-space: pre;
}

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.3px;
}

/* ── 佈局容器 ── */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar (深色專業風格) ── */
.navbar {
  width: var(--nav-width);
  height: 100vh;
  background: var(--nav-bg);
  padding: 0;
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0;
  top: 0;
  border-right: 1px solid var(--border-color);
  z-index: 1000;
  transition: transform 0.3s ease;
  overflow: hidden;
}

/* ── Navbar：亮色模式覆蓋 ── */
:root:not([data-theme="dark"]) .navbar {
  box-shadow: 2px 0 12px rgba(0, 0, 0, 0.06);
}

:root:not([data-theme="dark"]) .nav-brand {
  border-bottom-color: var(--border-color);
}

:root:not([data-theme="dark"]) .brand-link {
  color: var(--text-color) !important;
}

:root:not([data-theme="dark"]) .nav-section-title {
  color: var(--text-subtle);
}

:root:not([data-theme="dark"]) .nav-link {
  color: var(--text-muted);
}

:root:not([data-theme="dark"]) .nav-link:hover {
  background: rgba(37, 99, 235, 0.07);
  color: #1e40af;
}

:root:not([data-theme="dark"]) .nav-link.active {
  background: rgba(37, 99, 235, 0.1);
  color: #1d4ed8;
}

:root:not([data-theme="dark"]) .nav-controls {
  border-top-color: var(--border-color);
}

:root:not([data-theme="dark"]) .control-btn {
  background: var(--surface-color);
  border-color: var(--border-color);
  color: var(--text-muted);
}

:root:not([data-theme="dark"]) .control-btn:hover {
  background: #e2e8f0;
  color: var(--text-color);
}

:root:not([data-theme="dark"]) .nav-menu {
  scrollbar-color: #cbd5e1 transparent;
}

/* Brand Logo 區 */
.nav-brand {
  padding: 1.5rem 1.25rem 1.25rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  margin-bottom: 0.75rem;
  flex-shrink: 0;
}

.brand-link {
  font-size: 1.1rem;
  font-weight: 700;
  color: #f1f5f9 !important;
  text-decoration: none;
  letter-spacing: -0.3px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-link:hover {
  text-decoration: none;
}

/* Nav Menu */
.nav-menu {
  display: flex;
  flex-direction: column;
  gap: 0;
  flex: 1;
  overflow-y: auto;
  padding: 0 0.75rem;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
}

.nav-section {
  margin-bottom: 1.25rem;
}

.nav-section-title {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
  padding: 0 0.5rem;
  font-weight: 700;
}

.nav-link {
  color: var(--text-subtle);
  text-decoration: none;
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transition: all 0.15s ease;
  margin-bottom: 0.15rem;
  font-weight: 500;
}

.nav-icon {
  font-size: 1rem;
  opacity: 0.7;
  display: inline-block;
  min-width: 20px;
  text-align: center;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.07);
  color: #e2e8f0;
  text-decoration: none;
}

.nav-link:hover .nav-icon {
  opacity: 1;
}

.nav-link.active {
  background: var(--primary-subtle, rgba(37, 99, 235, 0.18));
  color: #60a5fa;
  font-weight: 600;
}

.nav-link.active .nav-icon {
  opacity: 1;
}

/* Nav Bottom Controls */
.nav-controls {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1rem 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  flex-shrink: 0;
}

.user-info {
  font-size: 0.85rem;
  color: var(--text-subtle);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.user-greeting {
  color: #cbd5e1;
}

.control-group {
  display: flex;
  gap: 0.5rem;
}

.control-btn {
  flex: 1;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 7px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-subtle);
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all 0.15s;
}

.control-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #e2e8f0;
}

/* ── 主內容區 ── */
main#main-content {
  flex: 1;
  margin-left: var(--nav-width);
  width: calc(100% - var(--nav-width));
  padding: 3rem 2.5rem;
  transition: margin-left 0.3s ease;
}

main#main-content>* {
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.lab-content,
.docs-container {
  max-width: 1200px !important;
}

/* ── 漢堡按鈕 ── */
.hamburger-btn {
  display: none;
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1100;
  background: var(--primary-color);
  color: white;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
  border: none;
  cursor: pointer;
}

.hamburger-btn .bar {
  background-color: var(--card-bg);
}

/* ── 按鈕系統 ── */
a {
  color: var(--primary-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.6rem 1.25rem;
  border-radius: 8px;
  border: none;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.2s, transform 0.15s, box-shadow 0.2s;
  min-height: 44px;
  min-width: 44px;
  box-sizing: border-box;
  letter-spacing: 0.1px;
}

.btn:active {
  transform: scale(0.97);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  filter: brightness(1.12);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

.btn-secondary {
  background: #334155;
  color: #e2e8f0;
}

.btn-secondary:hover {
  filter: brightness(1.15);
}

.btn-success {
  background: #059669;
  color: white;
  box-shadow: 0 2px 8px rgba(5, 150, 105, 0.25);
}

.btn-success:hover {
  filter: brightness(1.1);
}

.btn-danger {
  background: #dc2626;
  color: white;
  box-shadow: 0 2px 8px rgba(220, 38, 38, 0.25);
}

.btn-danger:hover {
  filter: brightness(1.1);
}

.btn-outline {
  background: transparent;
  color: var(--primary-color);
  border: 1.5px solid var(--primary-color);
}

.btn-outline:hover {
  background: var(--primary-subtle);
}

.btn-sm {
  padding: 0.4rem 0.9rem;
  font-size: 0.85rem;
  min-height: 36px;
}

.btn-lg {
  padding: 0.85rem 2rem;
  font-size: 1.05rem;
}

/* ── 表單元素 ── */
input,
textarea,
select {
  font-size: 16px;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--border-color);
  border-radius: var(--border-radius);
  width: 100%;
  box-sizing: border-box;
  background: var(--bg-color);
  color: var(--text-color);
  margin-bottom: 0.5rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-subtle);
}

/* ── 全局卡片組件 ── */
.lab-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-lg);
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
  margin-bottom: 1.5rem;
  transition: box-shadow 0.2s;
}

.lab-card:hover {
  box-shadow: var(--card-shadow-hover);
}

/* ── Status Badges ── */
.status-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  background: var(--surface-color);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.status-badge.success {
  background: #dcfce7;
  color: #166534;
  border-color: #86efac;
}

.status-badge.danger {
  background: var(--danger-subtle);
  color: var(--danger);
  border-color: #fca5a5;
}

.status-badge.warn {
  background: var(--warning-subtle);
  color: var(--warning);
  border-color: #fcd34d;
}

/* ── Info Section (教學區塊) ── */
.info-section {
  margin-top: 2rem;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: 1.5rem 2rem;
}

.info-section h3 {
  margin-top: 0;
  color: var(--text-color);
  font-size: 1rem;
}

.info-section ul {
  margin: 0;
  padding-left: 1.5rem;
  color: var(--text-muted);
}

.info-section li {
  margin-bottom: 0.4rem;
}

/* ── Btn Group ── */
.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
}

/* ── HR ── */
hr {
  border: 0;
  border-top: 1px solid var(--border-color);
  margin: 2rem 0;
}

/* ── Skip Link ── */
.skip-link:focus {
  top: 0 !important;
}

/* ── Page Transitions ── */
::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 0.2s;
}

/* ═══════════════════════════════════
   響應式佈局
   ═══════════════════════════════════ */
@media (max-width: 1024px) {
  .navbar {
    transform: translateX(-100%);
    width: 280px;
  }

  .navbar.open {
    transform: translateX(0);
  }

  main#main-content {
    margin-left: 0;
    max-width: 100%;
    padding: 1.25rem;
    padding-top: 4.5rem;
  }

  .hamburger-btn {
    display: flex;
  }

  .menu-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 900;
    backdrop-filter: blur(2px);
  }

  .menu-overlay.open {
    display: block;
  }
}

@media (max-width: 768px) {

  .playground-container,
  .docs-container,
  .lab-grid,
  .rtc-grid {
    grid-template-columns: 1fr !important;
    display: flex !important;
    flex-direction: column !important;
    gap: 1rem !important;
  }

  .docs-nav {
    width: 100% !important;
    position: static !important;
    margin-bottom: 1.5rem;
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    padding: 0.5rem;
  }

  h1 {
    font-size: 1.6rem;
  }

  h2 {
    font-size: 1.3rem;
  }

  h3 {
    font-size: 1.1rem;
  }

  .lab-card {
    padding: 1.25rem;
  }
}

@media (max-width: 480px) {
  .control-group {
    flex-wrap: wrap;
  }

  .control-btn {
    font-size: 0.78rem;
    padding: 6px;
  }

  main#main-content {
    padding: 1rem;
    padding-top: 4rem;
  }
}

/* ══════════════════════════════════════════════════
   全局深色模式 Override
   用高特異性批量覆蓋各頁面 <style> block 的硬編碼淺色值
   ══════════════════════════════════════════════════ */

/* 一般卡片/容器（各 lab 頁面的自訂卡片 class） */
[data-theme="dark"] .bt-card,
[data-theme="dark"] .compute-box,
[data-theme="dark"] .pwa-card,
[data-theme="dark"] .midi-card,
[data-theme="dark"] .net-card,
[data-theme="dark"] .panel:not(.status-badge),
[data-theme="dark"] .preflight-wrap,
[data-theme="dark"] .cred-item,
[data-theme="dark"] .metric-card,
[data-theme="dark"] .waterfall,
[data-theme="dark"] .pattern-grid .status-board {
  background: var(--card-bg) !important;
  border-color: var(--card-border) !important;
  color: var(--text-color) !important;
}

/* 淺灰面板（data-panel、info-grid 等） */
[data-theme="dark"] .data-panel,
[data-theme="dark"] .status-ui,
[data-theme="dark"] .info-item,
[data-theme="dark"] .stats,
[data-theme="dark"] .code-snippet {
  background: #1e293b !important;
  border-color: var(--card-border) !important;
  color: var(--text-color) !important;
}

/* 進度條背景 */
[data-theme="dark"] .bar-wrapper,
[data-theme="dark"] .progress-container {
  background: #1e293b !important;
}

[data-theme="dark"] .bar-text {
  color: var(--text-muted) !important;
}

/* 標籤 */
[data-theme="dark"] .tag-error {
  background: #2a0a0a !important;
  border-color: #7f1d1d !important;
}

[data-theme="dark"] .tag-success {
  background: #052e16 !important;
  border-color: #14532d !important;
}

/* hint 元素（WebCodecsPage 等） */
[data-theme="dark"] .hint {
  background: #1c1a0a;
  border-color: #78350f;
  color: #fcd34d;
}

/* LabIndex 卡片 */
[data-theme="dark"] .lab-item {
  background: var(--card-bg);
  border-color: var(--card-border);
  color: var(--text-color);
}

/* Scrollbar */
[data-theme="dark"] ::-webkit-scrollbar-track {
  background: #1e293b;
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: #334155;
  border-radius: 4px;
}