/* ============================================================
   小王的实验 — Editorial Warmth
   OKLCH palette · tinted neutrals · fluid type · 4pt spacing
   ============================================================ */

/* --- 本地字体 --- */
@font-face {
  font-family: 'LXGW WenKai';
  src: url('/fonts/LXGWWenKai-Regular.woff2') format('woff2'),
       url('/fonts/LXGWWenKai-Regular.ttf') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'LXGW WenKai';
  src: url('/fonts/LXGWWenKai-Bold.woff2') format('woff2'),
       url('/fonts/LXGWWenKai-Bold.ttf') format('truetype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Noto Sans SC';
  src: url('/fonts/NotoSansSC-Regular.woff2') format('woff2'),
       url('/fonts/NotoSansSC-Regular.otf') format('opentype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Noto Sans SC';
  src: url('/fonts/NotoSansSC-Medium.woff2') format('woff2'),
       url('/fonts/NotoSansSC-Medium.otf') format('opentype');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Noto Sans SC';
  src: url('/fonts/NotoSansSC-Bold.woff2') format('woff2'),
       url('/fonts/NotoSansSC-Bold.otf') format('opentype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* --- OKLCH 色彩系统 --- */
:root {
  /* 主色调：暖琥珀 */
  --color-accent:        oklch(58% 0.14 55);
  --color-accent-light:  oklch(92% 0.04 55);
  --color-accent-dim:    oklch(48% 0.10 55);

  /* 中性色（暖色调倾向） */
  --color-bg:            oklch(97.5% 0.005 75);
  --color-bg-deep:       oklch(95% 0.008 75);
  --color-surface:       oklch(99% 0.003 75);
  --color-border:        oklch(88% 0.012 75);
  --color-border-light:  oklch(93% 0.008 75);

  /* 文字色 */
  --color-text:          oklch(18% 0.015 55);
  --color-text-secondary:oklch(42% 0.02 55);
  --color-text-muted:    oklch(60% 0.015 55);
  --color-text-faint:    oklch(72% 0.01 55);

  /* 字体栈 */
  --font-display: 'LXGW WenKai', 'Noto Serif SC', 'Songti SC', Georgia, serif;
  --font-body:    'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', -apple-system, sans-serif;

  /* 模块化字体比例 (1.25 - Major Third) */
  --fs-3xl:  clamp(2.4rem,  1.6rem + 3.5vw,  4.5rem);
  --fs-2xl:  clamp(1.8rem,  1.3rem + 2vw,    3rem);
  --fs-xl:   clamp(1.35rem, 1.1rem + 1vw,    1.75rem);
  --fs-lg:   clamp(1.1rem,  1rem + 0.5vw,    1.35rem);
  --fs-base: clamp(0.95rem, 0.9rem + 0.2vw,  1.05rem);
  --fs-sm:   clamp(0.82rem, 0.78rem + 0.15vw,0.9rem);
  --fs-xs:   clamp(0.72rem, 0.68rem + 0.15vw,0.8rem);

  /* 4pt 间距系统 */
  --sp-1:  0.25rem;   /* 4px */
  --sp-2:  0.5rem;    /* 8px */
  --sp-3:  0.75rem;   /* 12px */
  --sp-4:  1rem;      /* 16px */
  --sp-6:  1.5rem;    /* 24px */
  --sp-8:  2rem;      /* 32px */
  --sp-12: 3rem;      /* 48px */
  --sp-16: 4rem;      /* 64px */
  --sp-24: 6rem;      /* 96px */

  /* 布局 */
  --max-w: 700px;
  --radius: 6px;
}

/* --- 重置 --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-kerning: normal;
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-accent-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}
a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

img { max-width: 100%; display: block; }

/* --- 容器 --- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-inline: clamp(var(--sp-4), 5vw, var(--sp-8));
}

/* ═══════ 头部 ═══════ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  padding: var(--sp-4) 0;
  background: oklch(97.5% 0.005 75 / 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border-light);
}
.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.header-logo {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.01em;
  border-bottom: none;
}
.header-logo:hover {
  color: var(--color-accent);
  border-bottom: none;
}
.header-nav {
  display: flex;
  gap: var(--sp-6);
}
.header-nav a {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
  border-bottom: none;
  font-weight: 500;
}
.header-nav a:hover {
  color: var(--color-text);
  border-bottom: none;
}

/* ═══════ 首屏 ═══════ */
.hero {
  padding: var(--sp-24) 0 var(--sp-16);
}
.hero-tag {
  font-size: var(--fs-xs);
  color: var(--color-accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 500;
  margin-bottom: var(--sp-6);
  font-variant-caps: all-small-caps;
}
.hero-title {
  font-family: var(--font-display);
  font-size: var(--fs-3xl);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-text);
  letter-spacing: -0.025em;
  margin-bottom: var(--sp-6);
}
.hero-desc {
  font-size: var(--fs-lg);
  color: var(--color-text-secondary);
  max-width: 42ch;
  line-height: 1.65;
  margin-bottom: var(--sp-12);
}

/* 首屏数据 */
.hero-stats {
  display: flex;
  gap: var(--sp-12);
  padding-top: var(--sp-8);
  border-top: 1px solid var(--color-border);
}
.stat {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}
.stat-num {
  font-family: var(--font-display);
  font-size: var(--fs-2xl);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1;
  letter-spacing: -0.02em;
}
.stat-label {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ═══════ 通用 Section ═══════ */
.section {
  padding: var(--sp-16) 0;
  border-top: 1px solid var(--color-border);
}
.section-label {
  font-size: var(--fs-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.15em;
  font-variant-numeric: tabular-nums;
  margin-bottom: var(--sp-3);
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.25;
  margin-bottom: var(--sp-8);
  letter-spacing: -0.01em;
}

/* ═══════ 关于 ═══════ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-8);
}
.about-text p {
  color: var(--color-text-secondary);
  max-width: 55ch;
  margin-bottom: var(--sp-4);
  line-height: 1.8;
}
.about-text p:last-child { margin-bottom: 0; }

.meta-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-4);
}
.meta-item {
  padding: var(--sp-3) 0;
  border-top: 1px solid var(--color-border-light);
}
.meta-item dt {
  font-size: var(--fs-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--sp-1);
}
.meta-item dd {
  font-size: var(--fs-sm);
  color: var(--color-text);
  font-weight: 500;
}



/* ═══════ 底部 / 备案 ═══════ */
.site-footer {
  margin-top: var(--sp-16);
  padding: var(--sp-8) 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-deep);
}
.footer-main {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--sp-2);
  flex-wrap: wrap;
  margin-bottom: var(--sp-4);
}
.footer-copy {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}
.footer-dot {
  color: var(--color-border);
  font-size: var(--fs-xs);
}
.footer-note {
  font-size: var(--fs-xs);
  color: var(--color-text-faint);
}
.footer-beian {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
}
.footer-beian a {
  font-size: var(--fs-xs);
  color: var(--color-text-faint);
  border-bottom: none;
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
}
.footer-beian a:hover {
  color: var(--color-text-muted);
  border-bottom: none;
}
.beian-icon {
  width: 14px;
  height: 14px;
  object-fit: contain;
  flex-shrink: 0;
}
.beian-divider {
  display: inline-block;
  width: 1px;
  height: 12px;
  background: var(--color-border);
}

/* ═══════ 响应式 ═══════ */
@media (max-width: 600px) {
  .header-inner {
    flex-direction: column;
    gap: var(--sp-3);
    align-items: flex-start;
  }
  .header-nav { gap: var(--sp-4); }
  .hero {
    padding: var(--sp-16) 0 var(--sp-12);
  }
  .hero-stats {
    flex-direction: column;
    gap: var(--sp-6);
  }
  .section { padding: var(--sp-12) 0; }
  .meta-list { grid-template-columns: 1fr; }

  .footer-beian { flex-direction: column; gap: var(--sp-2); }
  .beian-divider { display: none; }
}

/* ═══════ 打印 ═══════ */
@media print {
  .site-header, .site-footer { display: none; }
  body { background: #fff; color: #000; }
  a { color: #000; text-decoration: underline; }
  .hero-stats { display: none; }
}