/* ============================================================
   你的名字 · 个人主页
   暖纸极简 + 编辑部衬线斜体风格（参考 sitor.cc）
   ============================================================ */

/* ---------- 设计变量（浅色） ---------- */
:root {
  --color-bg: #f5f5f0;               /* 暖纸底 */
  --color-bg-translucent: rgba(245, 245, 240, 0.85);
  --color-surface: #ffffff;          /* 卡片 */
  --color-text: #1c1917;             /* 主文字 */
  --color-text-secondary: #57534e;   /* 次级文字 */
  --color-text-muted: #a8a29e;       /* 弱化文字 */
  --color-border: #e7e5e4;
  --color-border-hover: #d6d3d1;
  --color-primary: #44403c;
  --color-primary-hover: #292524;
  --color-primary-soft: #eceae7;
  --color-accent: #d4a574;           /* 焦糖强调 */
  --color-accent-hover: #b8906a;
  --color-accent-foreground: #2c2118;
  --color-accent-soft: #fdf6ee;

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-serif: "Playfair Display", Georgia, "Noto Serif SC", "Songti SC", SimSun, serif;

  --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 999px;

  --header-h: 72px;
  --content-w: 1080px;
}

/* ---------- 设计变量（暗色） ---------- */
html.dark {
  --color-bg: #0c0a09;
  --color-bg-translucent: rgba(12, 10, 9, 0.8);
  --color-surface: #1c1917;
  --color-text: #f5f5f4;
  --color-text-secondary: #a8a29e;
  --color-text-muted: #78716c;
  --color-border: #292524;
  --color-border-hover: #44403c;
  --color-primary: #d6d3d1;
  --color-primary-hover: #f5f5f4;
  --color-primary-soft: #292524;
  --color-accent: #e0b88a;
  --color-accent-hover: #ecd2ac;
  --color-accent-foreground: #2c2118;
  --color-accent-soft: #2a2118;

  --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 2px 12px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

/* ---------- 基础 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  color-scheme: light;
  -webkit-text-size-adjust: 100%;
}
html.dark { color-scheme: dark; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color 0.3s ease, color 0.3s ease;
}

::selection { background: var(--color-accent); color: var(--color-accent-foreground); }

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

img, svg { display: block; }

section[id] { scroll-margin-top: calc(var(--header-h) + 24px); }

/* ---------- 纸噪点层 ---------- */
.paper-texture {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.015;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
}
html.dark .paper-texture { opacity: 0.03; }

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 200;
  background: var(--color-primary);
  color: #ffffff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  text-decoration: none;
  transition: top 0.15s ease-out;
}
.skip-link:focus { top: 12px; }
html.dark .skip-link { background: var(--color-accent); color: var(--color-accent-foreground); }

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-bg-translucent);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}
.header-inner {
  position: relative;
  max-width: var(--content-w);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--color-text);
}
.brand-mark {
  width: 22px;
  height: 22px;
  color: var(--color-accent);
  flex: none;
}
.brand-name {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-synthesis: none;
}
.site-nav {
  display: flex;
  gap: 28px;
  justify-content: center;
}
.nav-link {
  font-size: 14px;
  color: var(--color-text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s ease-out;
}
.nav-link:hover { color: var(--color-text); }
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-self: end;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.2;
  padding: 10px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.15s ease-out, color 0.15s ease-out,
    border-color 0.15s ease-out, box-shadow 0.15s ease-out, transform 0.15s ease-out;
}
.btn svg { width: 16px; height: 16px; flex: none; }
.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background-color: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
html.dark .btn-primary {
  background-color: var(--color-accent);
  color: var(--color-accent-foreground);
}
html.dark .btn-primary:hover { background-color: var(--color-accent-hover); }
.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-md);
}
.btn-ghost {
  color: var(--color-text-secondary);
  padding: 10px 12px;
}
.btn-ghost:hover { color: var(--color-text); }

/* ---------- 图标按钮 ---------- */
.icon-btn {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: background-color 0.15s ease-out, color 0.15s ease-out,
    border-color 0.15s ease-out;
}
.icon-btn:hover {
  background-color: var(--color-primary-soft);
  color: var(--color-text);
  border-color: var(--color-border);
}
.icon-btn svg { width: 18px; height: 18px; }

/* 主题切换图标 */
.theme-toggle .icon-sun { display: none; }
html.dark .theme-toggle .icon-sun { display: block; }
html.dark .theme-toggle .icon-moon { display: none; }

/* 移动端导航按钮 */
.nav-toggle { display: none; }
.nav-toggle .icon-x { display: none; }
.nav-toggle[aria-expanded="true"] .icon-x { display: block; }
.nav-toggle[aria-expanded="true"] .icon-menu { display: none; }

/* ---------- Hero ---------- */
.hero {
  min-height: calc(100vh - var(--header-h));
  display: flex;
  align-items: center;
  padding: 72px 24px 96px;
}
.hero-inner {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}
.hero-mark {
  width: 44px;
  height: 44px;
  margin: 0 auto 24px;
  color: var(--color-accent);
}
.hero-title {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(40px, 7vw, 64px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
  color: var(--color-text);
  font-synthesis: none;
}
.hero-sub {
  font-size: clamp(16px, 2vw, 18px);
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin: 0 auto 36px;
  max-width: 32em;
  text-wrap: balance;
}
/* 关键词马克笔高亮：62% 处半透明 accent 色带 */
.hl {
  background-image: linear-gradient(transparent 62%,
    color-mix(in srgb, var(--color-accent) 25%, transparent) 62%);
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}
.hero-traits {
  display: flex;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
  margin: 0 0 40px;
}
.hero-trait {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-secondary);
}
.trait-num {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 15px;
  color: var(--color-accent);
}
.hero-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* Hero 入场 stagger */
.hero-inner .reveal:nth-child(1) { transition-delay: 0.02s; }
.hero-inner .reveal:nth-child(2) { transition-delay: 0.08s; }
.hero-inner .reveal:nth-child(3) { transition-delay: 0.14s; }
.hero-inner .reveal:nth-child(4) { transition-delay: 0.20s; }
.hero-inner .reveal:nth-child(5) { transition-delay: 0.26s; }

/* ---------- 区块通用 ---------- */
.section { padding: 120px 24px; }
.section-inner { max-width: var(--content-w); margin: 0 auto; }
.section-inner--narrow { max-width: 680px; }
.section-head { margin: 0 0 44px; }
.section-head--center { text-align: center; }
.section-head--center .section-kicker { justify-content: center; }
.section-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--color-text-secondary);
  margin: 0 0 16px;
}
.kicker-line {
  width: 24px;
  height: 1px;
  background-color: var(--color-accent);
  flex: none;
}
.section-title {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(28px, 4.2vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--color-text);
  font-synthesis: none;
}

/* ---------- 关于 ---------- */
.about-body p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin: 0 0 20px;
}
.about-body strong { color: var(--color-text); font-weight: 600; }
.about-sign {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 18px;
  color: var(--color-accent-hover);
  margin-top: 28px;
}

/* ---------- 项目卡片 ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s ease-out, box-shadow 0.15s ease-out,
    transform 0.15s ease-out, background-color 0.3s ease;
}
.card:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.card-index {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 18px;
  line-height: 1;
  color: var(--color-accent);
  opacity: 0.85;
  margin: 0 0 14px;
}
.card-title {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.35;
  margin: 0 0 10px;
  color: var(--color-text);
}
.card-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin: 0 0 20px;
}
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 20px;
}
.tag {
  font-size: 12px;
  line-height: 1.4;
  color: var(--color-text-secondary);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 3px 10px;
}
.card-link {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.15s ease-out;
}
.card-link svg {
  width: 14px;
  height: 14px;
  transition: transform 0.15s ease-out;
}
.card-link:hover { color: var(--color-accent-hover); }
.card-link:hover svg { transform: translate(2px, -2px); }

/* ---------- 联系 ---------- */
.contact { text-align: center; }
.contact-line {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin: 0 0 32px;
}
.contact-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}
.mail-link {
  font-size: 15px;
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
  transition: color 0.15s ease-out, border-color 0.15s ease-out;
}
.mail-link:hover {
  color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 48px 24px 36px;
  transition: border-color 0.3s ease;
}
.footer-inner {
  max-width: var(--content-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-nav { display: flex; gap: 24px; }
.footer-nav a {
  font-size: 14px;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.15s ease-out;
}
.footer-nav a:hover { color: var(--color-text); }
.footer-social { display: flex; gap: 8px; }
.footer-bottom {
  max-width: var(--content-w);
  margin: 36px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 12px;
  color: var(--color-text-muted);
}

/* ---------- 滚动入场（仅 JS 可用时隐藏；无 JS 时内容完整可见） ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.js .reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1100px) {
  .site-nav { gap: 20px; }
  .section { padding: 104px 24px; }
}

@media (max-width: 768px) {
  :root { --header-h: 56px; }

  .header-inner {
    grid-template-columns: auto 1fr;
    padding: 0 16px;
  }
  .site-nav {
    position: absolute;
    top: calc(100% + 8px);
    left: 16px;
    right: 16px;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    /* 关闭时：先淡出，结束后再隐藏（visibility 延迟翻转） */
    transition: opacity 0.15s ease-out, transform 0.15s ease-out, visibility 0s 0.15s;
  }
  .site-nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
    /* 展开时：立即可见并淡入 */
    transition: opacity 0.15s ease-out, transform 0.15s ease-out, visibility 0s;
  }
  .site-nav .nav-link {
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-size: 15px;
  }
  .site-nav .nav-link:hover {
    background: var(--color-primary-soft);
    color: var(--color-text);
  }
  .nav-toggle { display: inline-flex; }
  .header-cta { display: none; }

  .hero { padding: 56px 24px 72px; }
  .section { padding: 80px 24px; }
  .section-head { margin-bottom: 32px; }
  .projects-grid { grid-template-columns: 1fr; }
  .card { padding: 24px; }

  .footer-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 20px;
  }
}

@media (max-width: 640px) {
  .header-inner { padding: 0 16px; }
  .hero-traits { gap: 16px 20px; }
  .contact-actions { flex-direction: column; gap: 16px; }
}

@media (max-width: 480px) {
  .hero { padding: 48px 16px 64px; }
  .hero-mark { width: 36px; height: 36px; margin-bottom: 20px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; max-width: 280px; }
  .section { padding: 56px 16px; }
  .card { padding: 20px; }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-inner .reveal { transition-delay: 0s !important; }
}