/* ============================================
   Himisen.cn - 设计系统 v1.0
   主题：GEO + AI 科技
   作者：Senior Developer
   ============================================ */

/* CSS 变量（设计令牌） */
:root {
  /* 色彩 - 深色科技主题 */
  --bg-base: #060818;
  --bg-elevated: #0d1126;
  --bg-card: rgba(20, 26, 56, 0.6);
  --bg-glass: rgba(255, 255, 255, 0.04);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);

  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.72);
  --text-tertiary: rgba(255, 255, 255, 0.48);
  --text-muted: rgba(255, 255, 255, 0.32);

  /* 品牌强调色 - 渐变三色 */
  --brand-primary: #6366f1;
  --brand-secondary: #8b5cf6;
  --brand-tertiary: #06b6d4;
  --brand-accent: #f59e0b;

  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
  --gradient-text: linear-gradient(135deg, #a5b4fc 0%, #c4b5fd 30%, #67e8f9 100%);
  --gradient-glow: radial-gradient(circle at center, rgba(99, 102, 241, 0.4) 0%, transparent 70%);
  --gradient-bg-soft: linear-gradient(180deg, #060818 0%, #0d1126 100%);

  /* 间距系统 */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 8rem;

  /* 字号 */
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.25rem;
  --fs-xl: 1.5rem;
  --fs-2xl: 2rem;
  --fs-3xl: 2.75rem;
  --fs-4xl: 3.75rem;
  --fs-5xl: 5rem;

  /* 圆角 */
  --r-sm: 6px;
  --r-md: 12px;
  --r-lg: 20px;
  --r-xl: 28px;
  --r-full: 9999px;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.24);
  --shadow-lg: 0 24px 48px rgba(0, 0, 0, 0.32);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.32);

  /* 动效曲线 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* 容器 */
  --container-max: 1280px;
  --container-px: clamp(1rem, 4vw, 2.5rem);

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
               "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", Monaco, Consolas, "Courier New", monospace;
}

/* 浅色主题 */
[data-theme="light"] {
  --bg-base: #f8fafc;
  --bg-elevated: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.7);
  --bg-glass: rgba(255, 255, 255, 0.6);

  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-strong: rgba(15, 23, 42, 0.16);

  --text-primary: #0f172a;
  --text-secondary: rgba(15, 23, 42, 0.72);
  --text-tertiary: rgba(15, 23, 42, 0.48);
  --text-muted: rgba(15, 23, 42, 0.32);

  --gradient-bg-soft: linear-gradient(180deg, #f8fafc 0%, #e2e8f0 100%);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 24px 48px rgba(15, 23, 42, 0.12);
}

/* 重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-base);
  background-image:
    radial-gradient(at 20% 0%, rgba(99, 102, 241, 0.18) 0px, transparent 50%),
    radial-gradient(at 80% 100%, rgba(6, 182, 212, 0.12) 0px, transparent 50%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color 0.4s var(--ease-out), color 0.4s var(--ease-out);
}

/* 网格背景层 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

[data-theme="light"] body::before {
  background-image:
    linear-gradient(rgba(15, 23, 42, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 23, 42, 0.04) 1px, transparent 1px);
}

img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; transition: color 0.2s var(--ease-out); }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* 排版 */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

h1 { font-size: clamp(2.25rem, 5vw + 1rem, var(--fs-5xl)); }
h2 { font-size: clamp(1.875rem, 3.5vw + 0.5rem, var(--fs-4xl)); }
h3 { font-size: clamp(1.5rem, 2vw + 0.5rem, var(--fs-2xl)); }
h4 { font-size: var(--fs-xl); }
h5 { font-size: var(--fs-lg); }

p { color: var(--text-secondary); }

.text-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.text-mono { font-family: var(--font-mono); }

/* 容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-inline: var(--container-px);
  position: relative;
  z-index: 1;
}

/* 区块 */
.section {
  padding-block: clamp(4rem, 8vw, 8rem);
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
  max-width: 720px;
  margin-inline: auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-full);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  backdrop-filter: blur(12px);
}

.section-tag::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--brand-tertiary);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--brand-tertiary);
}

.section-title {
  margin-bottom: var(--space-md);
}

.section-desc {
  font-size: var(--fs-md);
  color: var(--text-secondary);
  max-width: 600px;
  margin-inline: auto;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-size: var(--fs-base);
  font-weight: 600;
  border-radius: var(--r-md);
  transition: all 0.3s var(--ease-out);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(99, 102, 241, 0.5);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 0%, rgba(255,255,255,0.2) 50%, transparent 100%);
  transform: translateX(-100%);
  transition: transform 0.6s var(--ease-out);
}

.btn-primary:hover::before { transform: translateX(100%); }

.btn-ghost {
  background: var(--bg-glass);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  backdrop-filter: blur(12px);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--brand-primary);
}

.btn-arrow {
  display: inline-block;
  transition: transform 0.3s var(--ease-out);
}

.btn:hover .btn-arrow { transform: translateX(4px); }

/* 卡片 */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  padding: var(--space-xl);
  backdrop-filter: blur(20px) saturate(180%);
  transition: all 0.4s var(--ease-out);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-lg);
}

.card-glow::before {
  content: '';
  position: absolute;
  inset: -1px;
  background: var(--gradient-primary);
  border-radius: inherit;
  opacity: 0;
  z-index: -1;
  transition: opacity 0.4s var(--ease-out);
  filter: blur(20px);
}

.card-glow:hover::before { opacity: 0.3; }

/* 网格 */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.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)); }

/* 滚动动画 */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

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

/* 辅助类 */
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }

.text-center { text-align: center; }
.flex-center { display: flex; align-items: center; justify-content: center; }

/* 选择文本 */
::selection {
  background: var(--brand-primary);
  color: #fff;
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--r-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--brand-primary); }

/* 响应式 */
@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
  .section { padding-block: 4rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}