/**
 * MetaFo 统一设计系统 v1.0
 * 2026-03-12
 *
 * 用法: 在任何 HTML 页面 <head> 中加入:
 *   <link rel="stylesheet" href="/cc/static/metafo-brand.css">
 *   <link rel="icon" type="image/svg+xml" href="/cc/static/favicon.svg">
 *
 * 本文件只提供 CSS 变量 + 基础组件样式。
 * 各页面的具体布局仍在各自 <style> 中定义。
 */

/* ============================================================
   0. Google Fonts
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;700;900&family=Noto+Sans+SC:wght@300;400;500;700&family=JetBrains+Mono:wght@400;500;700&display=swap');

/* ============================================================
   1. Design Tokens (CSS Custom Properties)
   ============================================================ */
:root {
  /* --- Brand Colors --- */
  --brand: #FF6B00;
  --brand-light: #FF8533;
  --brand-dark: #E05A00;
  --brand-glow: rgba(255, 107, 0, 0.3);
  --brand-border: rgba(255, 107, 0, 0.15);
  --brand-tint: rgba(255, 107, 0, 0.08);
  --brand-gradient: linear-gradient(135deg, #FF6B00, #ff9940);

  /* --- Semantic Colors --- */
  --success: #22c55e;
  --warning: #FACC15;
  --error: #ef4444;
  --info: #3B82F6;

  /* --- Surface Colors --- */
  --surface-base: #0a0e17;
  --surface-bg: #0f172a;
  --surface-card: #1e293b;
  --surface-elevated: #334155;
  --surface-overlay: rgba(15, 23, 42, 0.85);

  /* --- Text Colors --- */
  --text-primary: #F3F4F6;
  --text-secondary: #D1D5DB;
  --text-muted: #9CA3AF;
  --text-dim: #6B7280;

  /* --- Border --- */
  --border: rgba(255, 255, 255, 0.08);
  --border-subtle: rgba(255, 255, 255, 0.04);
  --border-strong: rgba(255, 255, 255, 0.15);

  /* --- Typography --- */
  --font-sans: Inter, 'Noto Sans SC', -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  --fs-caption: 0.75rem;
  --fs-small: 0.875rem;
  --fs-body: 1rem;
  --fs-h3: 1.375rem;
  --fs-h2: 1.75rem;
  --fs-h1: 2.25rem;
  --fs-display: 3rem;

  --fw-light: 300;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-bold: 700;
  --fw-black: 900;

  --lh-tight: 1.1;
  --lh-heading: 1.2;
  --lh-body: 1.6;

  /* --- Spacing --- */
  --sp-xs: 4px;
  --sp-sm: 8px;
  --sp-md: 12px;
  --sp-base: 16px;
  --sp-lg: 24px;
  --sp-xl: 32px;
  --sp-2xl: 48px;
  --sp-3xl: 64px;

  /* --- Radius --- */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* --- Shadows --- */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --glow-sm: 0 0 12px rgba(255, 107, 0, 0.2);
  --glow-md: 0 0 20px rgba(255, 107, 0, 0.25);
  --glow-lg: 0 0 40px rgba(255, 107, 0, 0.3);

  /* --- Motion --- */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* --- Grid Texture --- */
  --grid-size: 48px;
  --grid-opacity: 0.02;
  --grid-glow-opacity: 0.06;
}

/* ============================================================
   2. Base Reset & Typography
   ============================================================ */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--text-primary);
  background: var(--surface-bg);
  min-height: 100vh;
}

/* ============================================================
   3. Brand Background Texture (视觉签名)
   ============================================================ */
.mf-bg-grid,
body.mf-branded::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(ellipse at 30% 0%,
      rgba(255, 107, 0, var(--grid-glow-opacity)) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 100%,
      rgba(59, 130, 246, 0.03) 0%, transparent 50%),
    linear-gradient(
      rgba(255, 107, 0, var(--grid-opacity)) 1px, transparent 1px),
    linear-gradient(90deg,
      rgba(255, 107, 0, var(--grid-opacity)) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%,
    var(--grid-size) var(--grid-size),
    var(--grid-size) var(--grid-size);
}

/* ============================================================
   4. Component: Cards
   ============================================================ */
.mf-card {
  background: var(--surface-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--sp-lg);
  transition: border-color var(--duration-normal) var(--ease),
              box-shadow var(--duration-normal) var(--ease);
}
.mf-card:hover {
  border-color: var(--brand-border);
  box-shadow: var(--glow-sm);
}

.mf-card-elevated {
  background: var(--surface-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: var(--sp-lg);
}

/* ============================================================
   5. Component: Buttons
   ============================================================ */
.mf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-sm);
  padding: var(--sp-sm) var(--sp-base);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  cursor: pointer;
  border: none;
  transition: all var(--duration-fast) var(--ease);
  text-decoration: none;
  white-space: nowrap;
}

.mf-btn-primary {
  background: var(--brand-gradient);
  color: #fff;
  box-shadow: var(--glow-sm);
}
.mf-btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: var(--glow-md);
}
.mf-btn-primary:active {
  filter: brightness(0.95);
}

.mf-btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.mf-btn-ghost:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.mf-btn-danger {
  background: var(--error);
  color: #fff;
}
.mf-btn-danger:hover {
  filter: brightness(1.1);
}

/* ============================================================
   6. Component: Badges & Tags
   ============================================================ */
.mf-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-xs);
  padding: 2px var(--sp-sm);
  border-radius: var(--radius-sm);
  font-size: var(--fs-caption);
  font-weight: var(--fw-medium);
  line-height: 1.4;
}

.mf-badge-brand {
  background: var(--brand-tint);
  color: var(--brand-light);
  border: 1px solid var(--brand-border);
}
.mf-badge-success {
  background: rgba(34, 197, 94, 0.1);
  color: var(--success);
  border: 1px solid rgba(34, 197, 94, 0.2);
}
.mf-badge-warning {
  background: rgba(250, 204, 21, 0.1);
  color: var(--warning);
  border: 1px solid rgba(250, 204, 21, 0.2);
}
.mf-badge-error {
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
  border: 1px solid rgba(239, 68, 68, 0.2);
}
.mf-badge-muted {
  background: rgba(148, 163, 184, 0.1);
  color: var(--text-muted);
  border: 1px solid rgba(148, 163, 184, 0.15);
}

/* ============================================================
   7. Component: Status Dot (在线/离线)
   ============================================================ */
.mf-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.mf-dot-online  { background: var(--success); box-shadow: 0 0 8px rgba(34, 197, 94, 0.5); }
.mf-dot-idle    { background: var(--warning); }
.mf-dot-offline { background: var(--text-dim); }
.mf-dot-error   { background: var(--error); box-shadow: 0 0 8px rgba(239, 68, 68, 0.5); }

/* ============================================================
   8. Component: Brand Logo Mark
   ============================================================ */
.mf-logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--brand-gradient);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-weight: var(--fw-black);
  font-size: 14px;
  color: #fff;
  flex-shrink: 0;
  box-shadow: var(--glow-sm);
  letter-spacing: -0.5px;
}
.mf-logo-mark::after {
  content: 'MF';
}

.mf-logo-text {
  font-family: var(--font-sans);
  font-weight: var(--fw-bold);
  font-size: 15px;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================================
   9. Utility Classes
   ============================================================ */

/* Text colors */
.mf-text-brand  { color: var(--brand); }
.mf-text-muted  { color: var(--text-muted); }
.mf-text-dim    { color: var(--text-dim); }

/* Font sizes */
.mf-text-caption { font-size: var(--fs-caption); }
.mf-text-small   { font-size: var(--fs-small); }
.mf-text-h3      { font-size: var(--fs-h3); font-weight: var(--fw-bold); line-height: var(--lh-heading); }
.mf-text-h2      { font-size: var(--fs-h2); font-weight: var(--fw-bold); line-height: var(--lh-heading); }
.mf-text-h1      { font-size: var(--fs-h1); font-weight: var(--fw-black); line-height: var(--lh-heading); }
.mf-text-display { font-size: var(--fs-display); font-weight: var(--fw-black); line-height: var(--lh-tight); }

/* Glow */
.mf-glow     { box-shadow: var(--glow-md); }
.mf-glow-lg  { box-shadow: var(--glow-lg); }

/* Mono */
.mf-mono { font-family: var(--font-mono); }

/* Brand gradient text */
.mf-gradient-text {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Divider */
.mf-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--sp-lg) 0;
}

/* Scrollbar (Webkit) */
.mf-scrollbar::-webkit-scrollbar { width: 6px; height: 6px; }
.mf-scrollbar::-webkit-scrollbar-track { background: transparent; }
.mf-scrollbar::-webkit-scrollbar-thumb { background: var(--text-dim); border-radius: 3px; }
.mf-scrollbar::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ============================================================
   10. Responsive
   ============================================================ */
@media (max-width: 768px) {
  :root {
    --fs-display: 2.25rem;
    --fs-h1: 1.75rem;
    --fs-h2: 1.375rem;
    --fs-h3: 1.125rem;
  }
}

@media (max-width: 480px) {
  :root {
    --sp-lg: 16px;
    --sp-xl: 24px;
    --sp-2xl: 32px;
  }
}
