/* =========================================================
   个人主页样式表
   - 设计变量集中在 :root（深色默认）与 html[data-theme="light"]
   - 断点：900px（导航折叠 / 首屏改为单列）、640px（手机细节）
   - 无任何外部依赖（不加载 CDN 字体、框架或图标库）
   ========================================================= */

/* ---------- 1. 设计变量 ---------- */
:root {
  --font-sans: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei",
    "PingFang SC", "Hiragino Sans GB", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --max-width: 1080px;
  --header-h: 64px;

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 24px;

  --accent: #4f9cf9;
  --accent-strong: #7ab6ff;
  --accent-soft: rgba(79, 156, 249, 0.14);

  --dur: 200ms;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);

  /* 深色（默认） */
  --bg: #0f1115;
  --bg-elev: #171a21;
  --bg-elev-2: #1e222b;
  --border: #262b36;
  --text: #e6e8eb;
  --text-muted: #9aa3b2;
  --header-bg: rgba(15, 17, 21, 0.72);
  --shadow: 0 18px 40px -24px rgba(0, 0, 0, 0.9);
  --glow: radial-gradient(60% 60% at 50% 0%, rgba(79, 156, 249, 0.18), transparent 70%);
}

html[data-theme="light"] {
  color-scheme: light;

  --accent: #1f6fd0;
  --accent-strong: #1559a8;
  --accent-soft: rgba(31, 111, 208, 0.1);

  --bg: #f7f8fa;
  --bg-elev: #ffffff;
  --bg-elev-2: #eef1f6;
  --border: #e2e6ed;
  --text: #12161d;
  --text-muted: #5b6472;
  --header-bg: rgba(255, 255, 255, 0.78);
  --shadow: 0 18px 40px -26px rgba(15, 23, 42, 0.35);
  --glow: radial-gradient(60% 60% at 50% 0%, rgba(31, 111, 208, 0.14), transparent 70%);
}

/* ---------- 2. 基础重置 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

a:hover {
  color: var(--accent-strong);
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

p {
  margin: 0;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

button {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ---------- 3. 布局与通用组件 ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 24px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 100;
  padding: 10px 16px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  top: 12px;
}

/* ---------- 4. 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  width: 100%;
  height: var(--header-h);
  border-bottom: 1px solid transparent;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.site-header.is-scrolled {
  background: var(--header-bg);
  border-bottom-color: var(--border);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 600;
}

.brand:hover {
  color: var(--text);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
}

.brand-name {
  letter-spacing: 0.02em;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav a {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.site-nav a:hover {
  color: var(--text);
  background: var(--bg-elev-2);
}

/* 当前所在区块：由 main.js 的滚动监听标注，桌面与移动端样式一致 */
.site-nav a.is-active {
  color: var(--text);
  background: var(--bg-elev-2);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.icon-btn:hover {
  background: var(--bg-elev-2);
}

.icon-btn:active {
  transform: scale(0.96);
}

.icon {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* 深色主题下显示太阳（点击切到浅色），浅色下显示月亮 */
.theme-toggle .icon-sun {
  display: none;
}

html[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

html[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

.nav-toggle {
  display: none;
}

.nav-toggle-bar {
  display: block;
  width: 16px;
  height: 2px;
  margin: 2.5px 0;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
/* ---------- 5. 首屏 ---------- */
.hero {
  position: relative;
  padding: clamp(44px, 9vw, 92px) 0 clamp(36px, 7vw, 68px);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -200px 0 auto 0;
  height: 560px;
  background: var(--glow);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(32px, 6vw, 64px);
}

.eyebrow {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero h1 {
  margin-top: 8px;
  font-size: clamp(2.4rem, 6vw, 4rem);
}

.hero .accent {
  color: var(--accent);
}

.hero-role {
  margin-top: 12px;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  font-weight: 500;
}

/* 学校名：层级比定位低一档，单独占一行 */
.hero-school {
  margin-top: 8px;
  color: var(--text-muted);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.hero-desc {
  margin-top: 16px;
  max-width: 56ch;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.btn-primary {
  background: var(--accent);
  color: #08121f;
  box-shadow: 0 12px 26px -14px var(--accent);
}

.btn-primary:hover {
  background: var(--accent-strong);
  color: #08121f;
  transform: translateY(-1px);
}

.btn-ghost {
  background: var(--bg-elev);
  border-color: var(--border);
  color: var(--text);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--text);
  transform: translateY(-1px);
}

/* 浅色主题下强调色更深，按钮改用白字以保证对比度（>= 4.5:1） */
html[data-theme="light"] .btn-primary,
html[data-theme="light"] .btn-primary:hover {
  color: #ffffff;
}

/* ---------- 7. 社交图标 ---------- */
.social-list {
  display: flex;
  gap: 10px;
  margin-top: 28px;
}

.social-list a {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-muted);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.social-list a:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.social-list svg {
  width: 18px;
  height: 18px;
}

/* ---------- 8. 头像 ---------- */
.hero-media {
  position: relative;
  display: grid;
  place-items: center;
}

.hero-media::before {
  content: "";
  position: absolute;
  inset: -14px;
  border: 1px dashed var(--border);
  border-radius: 50%;
  animation: hero-spin 26s linear infinite;
}

.hero-media img {
  width: clamp(200px, 26vw, 280px);
  height: auto;
  aspect-ratio: 1;
  /* 非正方形照片会按中心裁成圆形，不会被拉伸变形 */
  object-fit: cover;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--bg-elev);
  box-shadow: var(--shadow);
}

@keyframes hero-spin {
  to {
    transform: rotate(360deg);
  }
}

/* ---------- 9. 通用区块 ---------- */
.section {
  padding-block: clamp(48px, 8vw, 88px);
}

.section-head {
  max-width: 62ch;
  margin-bottom: 36px;
}

.section-tag {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.section-head h2 {
  margin-top: 6px;
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
}

.section-head p {
  margin-top: 12px;
  color: var(--text-muted);
}

/* ---------- 10. 关于我 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(24px, 5vw, 56px);
  align-items: start;
}

.about-text p {
  color: var(--text-muted);
}

.about-text p + p {
  margin-top: 14px;
}

.about-text strong {
  color: var(--text);
  font-weight: 600;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.stat {
  padding: 18px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.stat strong {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.stat span {
  color: var(--text-muted);
  font-size: 0.85rem;
}
/* ---------- 11. 技能 ---------- */
.skill-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.skill-card {
  padding: 22px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.skill-card h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
}

.skill-card h3::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.chip {
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 500;
  line-height: 1.6;
}

/* ---------- 12. 项目 ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}

.project-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 24px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

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

.project-card h3 {
  font-size: 1.1rem;
}

.project-card p {
  margin-top: 10px;
  color: var(--text-muted);
  font-size: 0.94rem;
}

.project-card .chips {
  margin-top: 16px;
}

.project-links {
  display: flex;
  gap: 18px;
  margin-top: auto;
  padding-top: 20px;
  font-size: 0.9rem;
  font-weight: 600;
}

/* ---------- 13. 联系 ---------- */
.contact-card {
  display: grid;
  gap: 18px;
  justify-items: start;
  padding: clamp(28px, 5vw, 48px);
  background: linear-gradient(140deg, var(--bg-elev), var(--bg-elev-2));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.contact-card h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

.contact-card p {
  max-width: 52ch;
  color: var(--text-muted);
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  margin-top: clamp(24px, 5vw, 48px);
  padding-block: 28px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.86rem;
}

.footer-inner a {
  color: var(--text-muted);
}

.footer-inner a:hover {
  color: var(--accent);
}

/* ---------- 15. 滚动淡入 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 600ms var(--ease), transform 600ms var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 16. 响应式 ---------- */
@media (max-width: 900px) {
  .nav-toggle {
    display: inline-grid;
  }

  .nav-toggle.is-active .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle.is-active .nav-toggle-bar:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.is-active .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    display: none;
    padding: 8px 24px 20px;
    background: var(--bg-elev);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .site-nav a {
    display: block;
    padding: 12px 10px;
    border-radius: var(--radius-sm);
    font-size: 1rem;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-media {
    order: -1;
    justify-self: start;
  }

  .about-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  .container {
    padding-inline: 18px;
  }

  .hero {
    padding-top: 32px;
  }

  .hero-actions {
    gap: 10px;
  }

  .hero-actions .btn {
    flex: 1 1 140px;
  }

  .stat-grid {
    gap: 10px;
  }

  .project-card,
  .skill-card {
    padding: 20px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ---------- 17. 尊重"减少动效"偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}