:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI Variable Display", "Segoe UI Variable Text", "Segoe UI",
    "SF Pro Display", "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "JetBrains Mono", "Consolas", "Liberation Mono",
    Menlo, monospace;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --primary-blue: #1d68ff;
  --primary-hover: #0f56e9;
  --bg-page: #f8fafc;
  --border-light: rgba(226, 232, 240, 0.8);
  --reveal-duration: 0.65s;
  --reveal-distance: 28px;
}

*, *::before, *::after {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

html, body, button, input, select, textarea, div, p, span, a, li, h1, h2, h3, h4, h5, h6, table, th, td, label {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI Variable Display", "Segoe UI Variable Text", "Segoe UI",
    "SF Pro Display", "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
}

/* 消除所有等宽类下的宋体回退：英文数字走等宽，中文走无衬线苹方/微软雅黑 */
.font-mono, .font-mono-code, code, kbd, pre, samp {
  font-family: "SF Mono", "Cascadia Code", "JetBrains Mono", Consolas, "Liberation Mono", Menlo,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif !important;
}

html {
  scroll-behavior: smooth;
}

body {
  color: #1e293b;
  background-color: var(--bg-page);
  overflow-x: hidden;
}

/* Subtle architectural dot grid */
.bg-grid-blueprint {
  background-image: radial-gradient(rgba(30, 64, 175, 0.05) 1px, transparent 1px);
  background-size: 28px 28px;
}

/* Premium smooth shadow */
.shadow-clean-card {
  box-shadow: 0 10px 30px -10px rgba(0, 30, 80, 0.05), 0 2px 8px -2px rgba(0, 0, 0, 0.02);
}

.shadow-clean-card:hover {
  box-shadow: 0 20px 40px -12px rgba(0, 30, 80, 0.09), 0 4px 12px -2px rgba(0, 0, 0, 0.03);
}

/* Glass effect for modern floating panels */
.glass-clean {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.8);
}

/* Subtle ambient backdrop lighting */
.ambient-glow-hero {
  background: radial-gradient(60% 50% at 75% 40%, rgba(219, 234, 254, 0.7) 0%, rgba(248, 250, 252, 0) 80%),
              radial-gradient(40% 40% at 20% 20%, rgba(238, 242, 255, 0.6) 0%, rgba(248, 250, 252, 0) 70%),
              #f8fafc;
}

/* Key cap style */
kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.125rem 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  line-height: 1.2;
  color: #475569;
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-bottom-width: 2px;
  border-radius: 0.35rem;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.04);
}

/* Micro-interaction card lift */
.card-lift {
  transition: transform 0.35s var(--ease-out-expo), box-shadow 0.35s var(--ease-out-expo), border-color 0.3s ease;
}

.card-lift:hover {
  transform: translateY(-4px);
}

/* Button hover shine */
.btn-primary {
  background-color: #0f172a;
  color: #ffffff;
  transition: all 0.25s var(--ease-out-expo);
}

.btn-primary:hover {
  background-color: #1e293b;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px -2px rgba(15, 23, 42, 0.2);
}

.btn-secondary {
  background-color: #ffffff;
  color: #334155;
  border: 1px solid #e2e8f0;
  transition: all 0.25s var(--ease-out-expo);
}

.btn-secondary:hover {
  background-color: #f8fafc;
  border-color: #cbd5e1;
  transform: translateY(-1px);
}

/* Smooth reveal system */
[data-reveal] {
  opacity: 0;
  transform: translateY(var(--reveal-distance));
  transition: opacity var(--reveal-duration) var(--ease-out-expo),
              transform var(--reveal-duration) var(--ease-out-expo);
  will-change: opacity, transform;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

[data-reveal-child] {
  opacity: 0;
  transform: translateY(calc(var(--reveal-distance) * 0.6));
  transition: opacity var(--reveal-duration) var(--ease-out-expo),
              transform var(--reveal-duration) var(--ease-out-expo);
  will-change: opacity, transform;
}

[data-reveal-child].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Header sticky transition */
.site-header {
  transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.site-header.header-scrolled {
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
}

/* Clean mobile nav */
@media (max-width: 640px) {
  .mobile-nav-scroll {
    overflow-x: auto;
    scrollbar-width: none;
  }
  .mobile-nav-scroll::-webkit-scrollbar {
    display: none;
  }
}

/* ========================================================
   Obsidian Dark System (Raycast / Linear Grade)
   ======================================================== */
.obsidian-theme {
  background-color: #060810;
  color: #f1f5f9;
}

.obsidian-theme kbd,
.dark-kbd kbd {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-bottom: 2px solid rgba(255, 255, 255, 0.28);
  color: #c4b5fd;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

.bg-grid-obsidian {
  background-image: radial-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 28px 28px;
}

.glow-violet-hero {
  box-shadow: 0 0 80px -10px rgba(139, 92, 246, 0.45);
}

.glow-ambient-pill {
  box-shadow: 0 0 25px -4px rgba(139, 92, 246, 0.5);
}

.border-glass-dark {
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.glass-card-dark {
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* ========================================================
   macOS Frosted Acrylic Glass System (Apple Sonoma / Liquid Glass)
   ======================================================== */
.mac-wallpaper-ambient {
  background: 
    radial-gradient(ellipse 90% 60% at 15% -5%, rgba(147, 197, 253, 0.4), transparent 60%),
    radial-gradient(ellipse 75% 55% at 85% 15%, rgba(216, 180, 254, 0.35), transparent 60%),
    radial-gradient(ellipse 70% 60% at 50% 60%, rgba(224, 231, 255, 0.4), transparent 65%),
    #f8fafc;
  background-attachment: fixed;
}

.mac-frosted-glass {
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(28px) saturate(190%) contrast(102%);
  -webkit-backdrop-filter: blur(28px) saturate(190%) contrast(102%);
  border: 1px solid rgba(255, 255, 255, 0.65);
  box-shadow: 
    0 8px 32px 0 rgba(15, 23, 42, 0.05),
    0 1px 2px 0 rgba(15, 23, 42, 0.03),
    inset 0 1px 1.5px 0 rgba(255, 255, 255, 0.95);
}

.mac-frosted-glass:hover {
  background: rgba(255, 255, 255, 0.78);
  border-color: rgba(255, 255, 255, 0.85);
  box-shadow: 
    0 16px 40px -4px rgba(15, 23, 42, 0.09),
    0 2px 6px 0 rgba(15, 23, 42, 0.04),
    inset 0 1px 2px 0 rgba(255, 255, 255, 1);
}

.mac-frosted-dock {
  background: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(36px) saturate(210%);
  -webkit-backdrop-filter: blur(36px) saturate(210%);
  border: 1px solid rgba(255, 255, 255, 0.7);
  box-shadow: 
    0 20px 50px -10px rgba(15, 23, 42, 0.12),
    inset 0 1px 2px rgba(255, 255, 255, 0.9);
}

.mac-window-frame {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(32px) saturate(190%);
  -webkit-backdrop-filter: blur(32px) saturate(190%);
  border: 1px solid rgba(255, 255, 255, 0.75);
  box-shadow: 
    0 30px 80px -15px rgba(15, 23, 42, 0.2),
    0 0 1px 1px rgba(255, 255, 255, 0.9),
    inset 0 1px 2px rgba(255, 255, 255, 1);
}

/* 首屏背景大图底部平滑无缝羽化过渡，消除锋利切边硬线 */
.hero-seamless-mask {
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 50%, rgba(0, 0, 0, 0.75) 70%, rgba(0, 0, 0, 0.3) 85%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0%, #000 50%, rgba(0, 0, 0, 0.75) 70%, rgba(0, 0, 0, 0.3) 85%, transparent 100%);
}