/* ==========================================================================
   个人网站 · 样式表
   主题：深邃海军蓝 / 高端质感
   目录：变量 → 基础 → 氛围层 → 布局 → 组件 → 区块 → 响应式
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 设计变量
   -------------------------------------------------------------------------- */
:root {
  /* 背景层次：由深到浅的深蓝阶 */
  --bg: #071022;
  --bg-soft: #0a1730;
  --bg-elev: #0d1c3c;
  --bg-elev-2: #122346;

  /* 表面：带蓝调的半透明，比纯白半透明更有质感 */
  --surface: rgba(122, 162, 255, 0.045);
  --surface-2: rgba(122, 162, 255, 0.085);
  --surface-3: rgba(122, 162, 255, 0.14);

  /* 描边 */
  --border: rgba(125, 165, 255, 0.13);
  --border-strong: rgba(140, 180, 255, 0.28);

  /* 文字 */
  --text: #ebf2ff;
  --text-2: #a9bee2;
  --text-3: #7388ad;

  /* 强调色：宝石蓝 + 紫罗兰 + 青 */
  --accent: #4d94ff;
  --accent-2: #a78bfa;
  --accent-3: #34d8c0;
  --accent-soft: rgba(77, 148, 255, 0.14);
  --gradient: linear-gradient(102deg, #4d94ff 0%, #8b7dff 52%, #7dd3fc 100%);

  /* 光影 */
  --shadow-sm: 0 1px 2px rgba(2, 8, 23, 0.5);
  --shadow-md: 0 16px 40px -18px rgba(2, 8, 30, 0.85);
  --shadow-lg: 0 34px 70px -28px rgba(2, 8, 30, 0.95);
  --glow-soft: 0 0 0 1px rgba(77, 148, 255, 0.28), 0 20px 50px -22px rgba(77, 148, 255, 0.55);
  --glow-text: 0 0 42px rgba(77, 148, 255, 0.35);
  --inset-hi: inset 0 1px 0 rgba(255, 255, 255, 0.14);

  /* 渐变描边（卡片顶部高光线） */
  --hairline: linear-gradient(90deg, transparent, rgba(150, 190, 255, 0.45), transparent);

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 22px;
  --radius-xl: 26px;

  --header-h: 68px;
  --container: 1140px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
}

:root[data-theme="light"] {
  --bg: #f3f7fd;
  --bg-soft: #e9f0fb;
  --bg-elev: #ffffff;
  --bg-elev-2: #f7faff;

  --surface: rgba(30, 64, 175, 0.038);
  --surface-2: rgba(30, 64, 175, 0.07);
  --surface-3: rgba(30, 64, 175, 0.11);

  --border: rgba(30, 64, 175, 0.13);
  --border-strong: rgba(30, 64, 175, 0.26);

  --text: #0a1a38;
  --text-2: #455f8c;
  --text-3: #7b8fb4;

  --accent: #1d5fd8;
  --accent-2: #7c3aed;
  --accent-3: #0d9488;
  --accent-soft: rgba(29, 95, 216, 0.1);
  --gradient: linear-gradient(102deg, #1d5fd8 0%, #7c3aed 55%, #0891b2 100%);

  --shadow-sm: 0 1px 2px rgba(10, 26, 56, 0.08);
  --shadow-md: 0 18px 40px -22px rgba(10, 26, 56, 0.4);
  --shadow-lg: 0 34px 64px -32px rgba(10, 26, 56, 0.4);
  --glow-soft: 0 0 0 1px rgba(29, 95, 216, 0.25), 0 20px 46px -24px rgba(29, 95, 216, 0.45);
  --glow-text: none;
  --inset-hi: inset 0 1px 0 rgba(255, 255, 255, 0.9);
  --hairline: linear-gradient(90deg, transparent, rgba(29, 95, 216, 0.3), transparent);
}

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

html {
  background-color: var(--bg);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: transparent;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.72;
  letter-spacing: 0.002em;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: color 0.4s var(--ease-soft);
}

h1,
h2,
h3,
h4 {
  margin: 0;
  line-height: 1.24;
  letter-spacing: -0.022em;
  font-weight: 700;
}

p {
  margin: 0;
}

ul,
ol,
dl,
dd {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  font: inherit;
  color: inherit;
  border: 0;
  background: none;
  cursor: pointer;
}

svg {
  width: 1em;
  height: 1em;
  flex-shrink: 0;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

::selection {
  background: rgba(77, 148, 255, 0.32);
  color: var(--text);
}

/* 精致滚动条 */
@media (min-width: 900px) {
  ::-webkit-scrollbar {
    width: 11px;
    height: 11px;
  }

  ::-webkit-scrollbar-track {
    background: var(--bg);
  }

  ::-webkit-scrollbar-thumb {
    border: 3px solid var(--bg);
    border-radius: 999px;
    background: rgba(122, 162, 255, 0.22);
  }

  ::-webkit-scrollbar-thumb:hover {
    background: rgba(122, 162, 255, 0.4);
  }
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: 0 0 12px 12px;
  background: var(--accent);
  color: #04101f;
  font-weight: 600;
  transition: top 0.2s var(--ease);
}

.skip-link:focus {
  top: 0;
}

/* --------------------------------------------------------------------------
   3. 氛围层：深蓝底 + 顶部光晕 + 细噪点
   -------------------------------------------------------------------------- */
body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

/* 深蓝渐层与光晕 */
body::before {
  background:
    radial-gradient(ellipse 78% 46% at 50% -8%, rgba(64, 138, 255, 0.24), transparent 62%),
    radial-gradient(ellipse 58% 44% at 94% 4%, rgba(139, 92, 246, 0.16), transparent 58%),
    radial-gradient(ellipse 64% 40% at 2% 30%, rgba(34, 200, 220, 0.08), transparent 60%),
    linear-gradient(180deg, #0a1734 0%, #081229 42%, #060e1f 100%);
}

/* 细噪点，消除渐变色带、提升材质感 */
body::after {
  opacity: 0.032;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)'/%3E%3C/svg%3E");
}

:root[data-theme="light"] body::before {
  background:
    radial-gradient(ellipse 78% 46% at 50% -8%, rgba(29, 95, 216, 0.12), transparent 62%),
    radial-gradient(ellipse 58% 44% at 94% 4%, rgba(124, 58, 237, 0.09), transparent 58%),
    linear-gradient(180deg, #eef4fd 0%, #f4f8fe 45%, #f7faff 100%);
}

:root[data-theme="light"] body::after {
  opacity: 0.02;
}

/* --------------------------------------------------------------------------
   4. 顶栏
   -------------------------------------------------------------------------- */
.header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition: background-color 0.4s var(--ease-soft), border-color 0.4s var(--ease-soft),
    backdrop-filter 0.4s var(--ease-soft), box-shadow 0.4s var(--ease-soft);
}

.header.is-scrolled {
  background: rgba(8, 18, 41, 0.72);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom-color: var(--border);
  box-shadow: 0 12px 40px -24px rgba(2, 8, 30, 0.9);
}

:root[data-theme="light"] .header.is-scrolled {
  background: rgba(255, 255, 255, 0.78);
}

.header__inner {
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.015em;
  white-space: nowrap;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  color: var(--accent);
  transition: color 0.35s var(--ease), transform 0.5s var(--ease);
}

.brand__mark svg {
  width: 100%;
  height: 100%;
}

.brand__mark--sm {
  width: 30px;
  height: 30px;
}

.brand:hover .brand__mark {
  color: var(--accent-2);
  transform: rotate(-8deg) scale(1.04);
}

.brand__text {
  font-size: 1.05rem;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav__link {
  position: relative;
  padding: 8px 15px;
  border-radius: 999px;
  color: var(--text-2);
  font-size: 0.94rem;
  font-weight: 500;
  transition: color 0.3s var(--ease-soft), background-color 0.3s var(--ease-soft);
}

.nav__link:hover {
  color: var(--text);
  background: var(--surface-2);
}

.nav__link.is-active {
  color: var(--accent);
  background: var(--accent-soft);
}

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

.header__social,
.footer__social,
.hero__social {
  display: flex;
  align-items: center;
  gap: 4px;
}

.header__social {
  padding-right: 8px;
  margin-right: 2px;
  border-right: 1px solid var(--border);
}

.icon-link {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 11px;
  color: var(--text-2);
  font-size: 1.15rem;
  transition: color 0.3s var(--ease-soft), background-color 0.3s var(--ease-soft),
    transform 0.3s var(--ease), box-shadow 0.3s var(--ease-soft);
}

.icon-link:hover {
  color: var(--accent);
  background: var(--surface-2);
  transform: translateY(-2px);
  box-shadow: var(--inset-hi);
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-2);
  font-size: 1.15rem;
  box-shadow: var(--inset-hi);
  transition: color 0.3s var(--ease-soft), border-color 0.3s var(--ease-soft),
    background-color 0.3s var(--ease-soft);
}

.icon-btn:hover {
  color: var(--text);
  border-color: var(--border-strong);
  background: var(--surface-2);
}

.theme-toggle__sun,
.theme-toggle__moon {
  grid-area: 1 / 1;
  width: 1.15em;
  height: 1.15em;
  transition: opacity 0.35s var(--ease-soft), transform 0.5s var(--ease);
}

.theme-toggle__moon {
  opacity: 0;
  transform: rotate(-45deg) scale(0.55);
}

:root[data-theme="light"] .theme-toggle__sun {
  opacity: 0;
  transform: rotate(45deg) scale(0.55);
}

:root[data-theme="light"] .theme-toggle__moon {
  opacity: 1;
  transform: none;
}

.nav-toggle {
  display: none;
}

/* --------------------------------------------------------------------------
   5. 首屏
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding: calc(var(--header-h) + 96px) 0 116px;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.55;
}

.hero__orb--1 {
  top: -180px;
  left: -100px;
  width: 540px;
  height: 540px;
  background: radial-gradient(circle, rgba(77, 148, 255, 0.55), transparent 68%);
}

.hero__orb--2 {
  top: -100px;
  right: -140px;
  width: 580px;
  height: 580px;
  background: radial-gradient(circle, rgba(139, 124, 255, 0.45), transparent 68%);
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(125, 165, 255, 0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(125, 165, 255, 0.1) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(ellipse 78% 58% at 50% 0%, #000 18%, transparent 74%);
  -webkit-mask-image: radial-gradient(ellipse 78% 58% at 50% 0%, #000 18%, transparent 74%);
  opacity: 0.75;
}

.hero__inner {
  position: relative;
  max-width: 880px;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 17px 7px 13px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  box-shadow: var(--inset-hi);
  color: var(--text-2);
  font-size: 0.86rem;
  margin-bottom: 28px;
}

.pulse {
  position: relative;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-3);
  box-shadow: 0 0 12px rgba(52, 216, 192, 0.9);
}

.pulse::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1px solid var(--accent-3);
  animation: pulse 2.4s var(--ease) infinite;
}

@keyframes pulse {
  0% {
    transform: scale(0.7);
    opacity: 0.9;
  }
  100% {
    transform: scale(1.7);
    opacity: 0;
  }
}

.hero__title {
  font-size: clamp(2.2rem, 6.4vw, 4rem);
  line-height: 1.14;
  letter-spacing: -0.035em;
}

.hero__title .text-gradient {
  display: inline-block;
  margin-left: 0.3em;
}

.text-gradient {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 26px rgba(77, 148, 255, 0.28));
}

.hero__role {
  margin-top: 20px;
  color: var(--text-2);
  font-size: clamp(1rem, 2vw, 1.15rem);
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}

.dot-sep {
  color: var(--accent-2);
  margin: 0 4px;
}

.hero__desc {
  margin-top: 18px;
  max-width: 620px;
  color: var(--text-2);
  font-size: 1.07rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.hero__social {
  margin-top: 34px;
  gap: 8px;
}

.hero__social .icon-link {
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--inset-hi);
}

/* --------------------------------------------------------------------------
   6. 按钮
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 25px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.005em;
  white-space: nowrap;
  transition: transform 0.3s var(--ease), box-shadow 0.4s var(--ease-soft),
    background 0.4s var(--ease-soft), border-color 0.3s var(--ease-soft), color 0.3s var(--ease-soft);
}

.btn svg {
  width: 1.05em;
  height: 1.05em;
  transition: transform 0.35s var(--ease);
}

.btn--primary {
  background: var(--gradient);
  color: #04101f;
  box-shadow: var(--inset-hi), 0 14px 34px -14px rgba(77, 148, 255, 0.65);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--inset-hi), 0 22px 46px -16px rgba(77, 148, 255, 0.8);
}

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

.btn--ghost {
  border-color: var(--border-strong);
  background: var(--surface);
  box-shadow: var(--inset-hi);
  color: var(--text);
}

.btn--ghost:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* --------------------------------------------------------------------------
   7. 通用区块
   -------------------------------------------------------------------------- */
.section {
  position: relative;
  padding: 104px 0;
  scroll-margin-top: var(--header-h);
}

.section--alt {
  background: linear-gradient(180deg, rgba(10, 23, 48, 0.72) 0%, rgba(10, 23, 48, 0.5) 100%);
  border-block: 1px solid var(--border);
}

:root[data-theme="light"] .section--alt {
  background: linear-gradient(180deg, rgba(233, 240, 251, 0.9) 0%, rgba(240, 246, 253, 0.7) 100%);
}

.section__head {
  max-width: 660px;
  margin-bottom: 56px;
}

.section__index {
  display: inline-block;
  margin-bottom: 14px;
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  box-shadow: var(--inset-hi);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
}

.section__title {
  font-size: clamp(1.62rem, 3.6vw, 2.4rem);
  letter-spacing: -0.03em;
}

.section__lead {
  margin-top: 15px;
  color: var(--text-2);
  font-size: 1.02rem;
}

/* --------------------------------------------------------------------------
   8. 关于我
   -------------------------------------------------------------------------- */
.about {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 56px;
  align-items: start;
}

.about__media {
  position: sticky;
  top: calc(var(--header-h) + 28px);
}

.about__photo {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow-lg), var(--inset-hi);
}

.about__photo::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(160deg, rgba(77, 148, 255, 0.2), transparent 55%);
  pointer-events: none;
}

.about__photo img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
}

.about__caption {
  margin-top: 14px;
  text-align: center;
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  letter-spacing: 0.06em;
}

.about__bio {
  display: grid;
  gap: 16px;
}

.about__text {
  color: var(--text-2);
  font-size: 1.04rem;
}

.about__text:first-child {
  color: var(--text);
  font-size: 1.15rem;
}

.about__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-top: 36px;
}

.fact {
  position: relative;
  padding: 17px 19px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--inset-hi);
  transition: border-color 0.35s var(--ease-soft), transform 0.35s var(--ease),
    background-color 0.35s var(--ease-soft);
}

.fact:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  background: var(--surface-2);
}

.fact dt {
  color: var(--text-3);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.fact dd {
  margin-top: 7px;
  font-weight: 600;
  font-size: 0.97rem;
  word-break: break-word;
}

.fact a {
  color: var(--accent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease-soft);
}

.fact a:hover {
  border-bottom-color: currentColor;
}

/* 时间线 */
.roadmap {
  margin-top: 76px;
  padding-top: 48px;
  border-top: 1px solid transparent;
  border-image: var(--hairline) 1;
}

.roadmap__title {
  font-size: 1.2rem;
  margin-bottom: 30px;
}

.timeline {
  display: grid;
  gap: 6px;
}

.timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 24px;
  padding: 21px 24px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background-color 0.35s var(--ease-soft), border-color 0.35s var(--ease-soft),
    transform 0.35s var(--ease);
}

.timeline__item:hover {
  background: var(--surface);
  border-color: var(--border);
  transform: translateX(4px);
}

.timeline__period {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  padding-top: 3px;
  letter-spacing: 0.04em;
}

.timeline__title {
  font-size: 1.04rem;
}

.timeline__desc {
  margin-top: 7px;
  color: var(--text-2);
  font-size: 0.96rem;
}

/* --------------------------------------------------------------------------
   9. 技能
   -------------------------------------------------------------------------- */
.skills {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
}

.skill-group {
  position: relative;
  padding: 27px 27px 29px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--inset-hi);
  overflow: hidden;
  transition: border-color 0.4s var(--ease-soft), transform 0.4s var(--ease),
    box-shadow 0.4s var(--ease-soft), background-color 0.4s var(--ease-soft);
}

/* 顶部高光线：hover 时浮现 */
.skill-group::before,
.project-card::before,
.contact-card::before,
.projects-empty::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 1px;
  background: var(--hairline);
  opacity: 0;
  transition: opacity 0.45s var(--ease-soft);
}

.skill-group:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  background: var(--surface-2);
  box-shadow: var(--shadow-md), var(--inset-hi);
}

.skill-group:hover::before {
  opacity: 1;
}

.skill-group__title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
  margin-bottom: 19px;
}

.skill-group__title::before {
  content: "";
  width: 4px;
  height: 16px;
  border-radius: 2px;
  background: var(--gradient);
  box-shadow: 0 0 14px rgba(77, 148, 255, 0.6);
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(122, 162, 255, 0.06);
  color: var(--text-2);
  font-size: 0.87rem;
  transition: color 0.3s var(--ease-soft), border-color 0.3s var(--ease-soft),
    transform 0.3s var(--ease), box-shadow 0.3s var(--ease-soft), background-color 0.3s var(--ease-soft);
}

.chip:hover {
  color: var(--accent);
  border-color: rgba(77, 148, 255, 0.5);
  background: var(--accent-soft);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px -12px rgba(77, 148, 255, 0.8);
}

/* --------------------------------------------------------------------------
   10. 项目（含预留占位区）
   -------------------------------------------------------------------------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 22px;
}

.project-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 27px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--inset-hi);
  overflow: hidden;
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease-soft),
    box-shadow 0.4s var(--ease-soft), background-color 0.4s var(--ease-soft);
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: rgba(77, 148, 255, 0.45);
  background: var(--surface-2);
  box-shadow: var(--shadow-lg), var(--inset-hi);
}

.project-card:hover::before {
  opacity: 1;
}

.project-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.project-card__index {
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  letter-spacing: 0.08em;
}

.project-card__status {
  padding: 3px 11px;
  border-radius: 999px;
  background: rgba(52, 216, 192, 0.14);
  color: var(--accent-3);
  font-size: 0.75rem;
  font-weight: 600;
}

.project-card__title {
  font-size: 1.17rem;
}

.project-card__desc {
  color: var(--text-2);
  font-size: 0.96rem;
  flex-grow: 1;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.tag {
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.project-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  padding-top: 15px;
  border-top: 1px solid transparent;
  border-image: var(--hairline) 1;
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-2);
  font-size: 0.9rem;
  font-weight: 600;
  transition: color 0.3s var(--ease-soft), gap 0.3s var(--ease);
}

.project-card__link svg {
  width: 1.05em;
  height: 1.05em;
}

.project-card__link:hover {
  color: var(--accent);
  gap: 9px;
}

.project-card__link--primary {
  color: var(--accent);
}

/* 空状态：项目尚未放上来时展示 */
.projects-empty {
  position: relative;
  display: grid;
  justify-items: center;
  gap: 17px;
  padding: 66px 34px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-xl);
  background: var(--surface);
  box-shadow: var(--inset-hi);
  text-align: center;
  overflow: hidden;
}

.projects-empty__icon {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: 19px;
  border: 1px solid var(--border);
  background: linear-gradient(160deg, rgba(77, 148, 255, 0.14), rgba(139, 124, 255, 0.08));
  box-shadow: var(--inset-hi), 0 16px 34px -20px rgba(77, 148, 255, 0.7);
  color: var(--accent);
  font-size: 1.75rem;
}

.projects-empty__title {
  font-size: 1.22rem;
}

.projects-empty__desc {
  max-width: 520px;
  color: var(--text-2);
  font-size: 0.98rem;
}

.projects-empty__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 8px;
}

.projects-empty__actions .btn {
  padding: 10px 21px;
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   11. 联系方式
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 18px;
}

.contact-card {
  position: relative;
  display: flex;
  align-items: center;
  gap: 17px;
  padding: 23px 25px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--inset-hi);
  overflow: hidden;
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease-soft),
    background-color 0.4s var(--ease-soft), box-shadow 0.4s var(--ease-soft);
}

.contact-card:hover {
  transform: translateY(-5px);
  border-color: rgba(77, 148, 255, 0.45);
  background: var(--surface-2);
  box-shadow: var(--shadow-md), var(--inset-hi);
}

.contact-card:hover::before {
  opacity: 1;
}

.contact-card__icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  border-radius: 15px;
  border: 1px solid var(--border);
  background: linear-gradient(160deg, rgba(77, 148, 255, 0.13), rgba(139, 124, 255, 0.07));
  box-shadow: var(--inset-hi);
  color: var(--accent);
  font-size: 1.35rem;
  transition: color 0.35s var(--ease-soft), transform 0.4s var(--ease);
}

.contact-card:hover .contact-card__icon {
  color: var(--accent-2);
  transform: scale(1.07);
}

.contact-card__meta {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.contact-card__name {
  font-size: 1rem;
}

.contact-card__desc {
  color: var(--text-2);
  font-size: 0.88rem;
}

.contact-card__arrow {
  margin-left: auto;
  color: var(--text-3);
  font-size: 1.1rem;
  transition: transform 0.35s var(--ease), color 0.35s var(--ease-soft);
}

.contact-card:hover .contact-card__arrow {
  color: var(--accent);
  transform: translateX(5px);
}

/* --------------------------------------------------------------------------
   12. 页脚
   -------------------------------------------------------------------------- */
.footer {
  position: relative;
  padding: 50px 0 44px;
  background: rgba(6, 14, 31, 0.6);
  border-top: 1px solid var(--border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

:root[data-theme="light"] .footer {
  background: rgba(255, 255, 255, 0.62);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer__name {
  font-weight: 700;
}

.footer__note {
  color: var(--text-3);
  font-size: 0.88rem;
}

.footer__social {
  margin-left: auto;
}

.footer__copy,
.footer__icp {
  width: 100%;
  color: var(--text-3);
  font-size: 0.84rem;
}

.footer__icp:empty {
  display: none;
}

/* --------------------------------------------------------------------------
   13. 404
   -------------------------------------------------------------------------- */
.page-404 {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 40px 24px;
}

.notfound {
  text-align: center;
  max-width: 560px;
}

.notfound__code {
  font-family: var(--font-mono);
  font-size: clamp(4.5rem, 18vw, 8rem);
  font-weight: 700;
  line-height: 1;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 30px rgba(77, 148, 255, 0.35));
}

.notfound__title {
  margin-top: 22px;
  font-size: 1.6rem;
}

.notfound__desc {
  margin-top: 15px;
  color: var(--text-2);
}

.notfound__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 32px;
}

/* --------------------------------------------------------------------------
   14. 滚动入场动画（仅在有 JS 时启用）
   -------------------------------------------------------------------------- */
.js [data-animate] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.js [data-animate].is-visible {
  opacity: 1;
  transform: none;
}

/* --------------------------------------------------------------------------
   15. 响应式
   -------------------------------------------------------------------------- */
@media (max-width: 960px) {
  .about {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .about__media {
    position: static;
    max-width: 240px;
  }

  .nav {
    position: fixed;
    inset: var(--header-h) 0 auto;
    display: grid;
    gap: 4px;
    padding: 16px 24px 26px;
    background: rgba(8, 18, 41, 0.97);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 24px 50px -30px rgba(2, 8, 30, 0.95);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s var(--ease), transform 0.3s var(--ease),
      visibility 0.3s var(--ease);
    margin-left: 0;
  }

  :root[data-theme="light"] .nav {
    background: rgba(255, 255, 255, 0.97);
  }

  .nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav__link {
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 1rem;
  }

  .nav-toggle {
    display: grid;
  }

  .header__social {
    display: none;
  }

  .header__actions {
    margin-left: auto;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 18px;
  }

  .hero {
    padding: calc(var(--header-h) + 66px) 0 84px;
  }

  .hero__desc {
    font-size: 1rem;
  }

  .hero__actions .btn {
    flex: 1 1 auto;
  }

  .section {
    padding: 76px 0;
  }

  .section__head {
    margin-bottom: 40px;
  }

  .timeline__item {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .roadmap {
    margin-top: 56px;
    padding-top: 36px;
  }

  .projects-empty {
    padding: 46px 22px;
  }

  .footer__social {
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .js [data-animate] {
    opacity: 1;
    transform: none;
  }
}