/**
 * SERAMONX OFFICIAL UI/UX DESIGN SYSTEM CSS (VERSION 1.0)
 * 嚴格遵循 Tailwind 規範命名法、原生現代 CSS 變數與跨平台字型棧
 */

:root {
  /* --------------------------------------------------------------------------
     1. PRIMITIVE PALETTE (TAILWIND ZINC COMPATIBLE)
     -------------------------------------------------------------------------- */
  --zinc-950: #09090b;
  --zinc-900: #121215;
  --zinc-850: #18181c;
  --zinc-800: #27272a;
  --zinc-700: #3f3f46;
  --zinc-600: #52525b;
  --zinc-500: #71717a;
  --zinc-400: #a1a1aa;
  --zinc-300: #d4d4d8;
  --zinc-200: #e4e4e7;
  --zinc-100: #f4f4f5;
  --zinc-50:  #fafafa;
  --zinc-975: #040405;
  --color-white: #ffffff;
  --color-black: #09090b;

  /* --------------------------------------------------------------------------
     2. STATUS CONTRAST SEMANTICS (STRICT MONOCHROME ZINC SYSTEM)
     -------------------------------------------------------------------------- */
  --status-neutral: var(--zinc-500);
  --status-contrast: var(--text-primary);
  --status-subtle: var(--zinc-700);

  /* --------------------------------------------------------------------------
     3. SEMANTIC TOKENS (DARK THEME DEFAULT)
     -------------------------------------------------------------------------- */
  --bg-page: var(--zinc-950);
  --bg-surface: var(--zinc-900);
  --bg-surface-elevated: var(--zinc-850);
  --bg-canvas: var(--zinc-975);
  
  --border-subtle: var(--zinc-800);
  --border-strong: var(--zinc-700);

  --text-primary: var(--zinc-100);
  --text-secondary: var(--zinc-400);
  --text-muted: var(--zinc-500);

  /* --------------------------------------------------------------------------
     4. TYPOGRAPHY STACKS (CROSS-PLATFORM NATIVE FALLBACKS)
     -------------------------------------------------------------------------- */
  --font-sans: 'Inter',
    -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'PingFang TC',
    'Segoe UI', 'Microsoft JhengHei UI', 'Microsoft JhengHei',
    'Roboto', 'Noto Sans TC',
    'Source Han Sans TC', 'WenQuanYi Micro Hei',
    sans-serif;

  --font-mono: 'JetBrains Mono',
    'SF Mono', Monaco, Menlo,
    Consolas, 'Cascadia Code',
    ui-monospace, monospace;

  /* --------------------------------------------------------------------------
     4.1 TYPOGRAPHY SCALE (TAILWIND COMPATIBLE)
     -------------------------------------------------------------------------- */
  --text-xs: 0.75rem;    /* 12px */
  --text-sm: 0.875rem;   /* 14px */
  --text-base: 1rem;     /* 16px */
  --text-lg: 1.125rem;   /* 18px */
  --text-xl: 1.25rem;    /* 20px */
  --text-2xl: 1.5rem;    /* 24px */
  --text-3xl: 1.875rem;  /* 30px */
  --text-4xl: 2.25rem;   /* 36px */
  --text-5xl: 3rem;      /* 48px */

  /* --------------------------------------------------------------------------
     5. SPACING GRID (8PX SYSTEM)
     -------------------------------------------------------------------------- */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-14: 56px;
  --space-16: 64px;
  --space-20: 80px;

  /* --------------------------------------------------------------------------
     6. GEOMETRIC RADII & SHADOWS
     -------------------------------------------------------------------------- */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 22px;
  --radius-full: 9999px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-elevation: 0 16px 40px rgba(0, 0, 0, 0.6);

  --ease-blade: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s var(--ease-blade);
  --transition-theme: 0.25s var(--ease-blade);
}

/* --------------------------------------------------------------------------
   LIGHT THEME OVERRIDES
   -------------------------------------------------------------------------- */
[data-theme="light"] {
  --bg-page: var(--zinc-50);
  --bg-surface: var(--color-white);
  --bg-surface-elevated: var(--zinc-100);
  --bg-canvas: var(--color-white);

  --border-subtle: var(--zinc-200);
  --border-strong: var(--zinc-300);

  --text-primary: var(--zinc-950);
  --text-secondary: var(--zinc-600);
  --text-muted: var(--zinc-500);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
  --shadow-elevation: 0 16px 40px rgba(0, 0, 0, 0.08);
}

/* --------------------------------------------------------------------------
   BASE RESET
   -------------------------------------------------------------------------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-page);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-theme), color var(--transition-theme);
}

/* --------------------------------------------------------------------------
   GLOBAL TOP NAVIGATION (56PX STICKY BLUR)
   -------------------------------------------------------------------------- */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 56px;
  background: rgba(9, 9, 11, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-theme), border-color var(--transition-theme);
}

[data-theme="light"] .top-nav {
  background: rgba(250, 250, 250, 0.85);
}

.top-nav-inner {
  max-width: 1360px;
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
}

/* --------------------------------------------------------------------------
   STANDARD LAYOUT CONTAINER & PAGE HERO SYSTEM
   -------------------------------------------------------------------------- */
.container {
  max-width: 1360px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-20);
}

.page-hero {
  padding: var(--space-12) 0 var(--space-8);
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: var(--space-10);
}

.page-hero-meta {
  margin-bottom: var(--space-4);
}

.page-hero-title {
  font-size: var(--text-4xl);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: var(--space-4);
  color: var(--text-primary);
}

.page-hero-desc {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 820px;
}

.nav-brand-group {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  text-decoration: none;
  color: inherit;
}

.nav-logo-img {
  height: 26px;
  width: auto;
  display: block;
}

.nav-system-label {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  border-left: 1px solid var(--border-subtle);
  padding-left: var(--space-3);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 32px;
  padding: 0 var(--space-3);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.nav-item:hover {
  color: var(--text-primary);
  background: var(--bg-surface-elevated);
  border-color: var(--border-subtle);
}

.nav-item.active {
  background: var(--text-primary);
  color: var(--bg-page);
  border-color: var(--text-primary);
  font-weight: 700;
}

.nav-item.active:hover {
  opacity: 0.92;
}

/* --------------------------------------------------------------------------
   COMPREHENSIVE BUTTON SYSTEM
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
  transition: all var(--transition-base);
  outline: none;
}

/* SIZES */
.btn-sm {
  height: 32px;
  padding: 0 var(--space-3);
  font-size: 0.78rem;
  border-radius: var(--radius-sm);
}
.btn-sm .btn-icon {
  width: 14px;
  height: 14px;
}

.btn-md {
  height: 40px;
  padding: 0 var(--space-4);
  font-size: 0.875rem;
  border-radius: var(--radius-md);
}
.btn-md .btn-icon {
  width: 16px;
  height: 16px;
}

.btn-lg {
  height: 48px;
  padding: 0 var(--space-6);
  font-size: 1rem;
  border-radius: var(--radius-md);
}
.btn-lg .btn-icon {
  width: 18px;
  height: 18px;
}

/* ICON-ONLY BUTTON */
.btn-icon-only.btn-sm { width: 32px; padding: 0; }
.btn-icon-only.btn-md { width: 40px; padding: 0; }
.btn-icon-only.btn-lg { width: 48px; padding: 0; }

/* VARIANTS */
/* Primary: 黑白雙生反轉 */
.btn-primary {
  background: var(--text-primary);
  color: var(--bg-page);
  border-color: var(--text-primary);
}
.btn-primary:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}
.btn-primary:active {
  transform: translateY(0) scale(0.98);
}

/* Secondary: 微表面細線框 */
.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}
.btn-secondary:hover {
  border-color: var(--text-primary);
  transform: translateY(-1px);
}
.btn-secondary:active {
  transform: translateY(0) scale(0.98);
}
.btn-secondary.active {
  background: var(--text-primary);
  color: var(--bg-page);
  border-color: var(--text-primary);
}

/* Ghost: 幽靈透明 */
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}
.btn-ghost:hover {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
}
.btn-ghost:active {
  transform: scale(0.98);
}
.btn-ghost.active {
  background: var(--text-primary);
  color: var(--bg-page);
  border-color: var(--text-primary);
  font-weight: 700;
}

/* KEYBOARD ACCESSIBILITY FOCUS */
.btn:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

/* DISABLED STATE */
.btn:disabled,
.btn.disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
  transform: none !important;
}

/* TRAILING ARROW MOTION */
.btn:hover .btn-icon-arrow {
  transform: translateX(3px);
}
.btn-icon-arrow {
  transition: transform var(--transition-fast);
}

/* --------------------------------------------------------------------------
   MICRO VECTOR ICONS PRIMITIVES (STROKE-WIDTH: 1.5PX, CURRENTCOLOR)
   -------------------------------------------------------------------------- */
.ui-icon {
  display: inline-block;
  vertical-align: middle;
  stroke-width: 1.5;
  stroke: currentColor;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

/* 行內文字圖標：尺寸隨所在文字字級（1em），對齊文字基線 */
.ui-icon-inline {
  width: 1em;
  height: 1em;
  vertical-align: -0.125em;
}

/* --------------------------------------------------------------------------
   CARD CONTAINER PRIMITIVES
   -------------------------------------------------------------------------- */
.card-vis {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-elevation);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.card-vis:hover {
  border-color: var(--border-strong);
}

/* --------------------------------------------------------------------------
   BADGE CAPSULE PRIMITIVES
   -------------------------------------------------------------------------- */
.badge-capsule {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 3px var(--space-2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.02);
}

/* --------------------------------------------------------------------------
   INLINE CODE FORMATTING
   -------------------------------------------------------------------------- */
code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 2px 6px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}