/* ============================================================
   个人主页样式表
   改配色 → 只动 :root 和 [data-theme="light"] 里的变量
   ============================================================ */

:root {
  --bg: #0a0b0e;
  --bg-soft: #0f1116;
  --card: #12151b;
  --border: #232833;
  --border-strong: #303745;
  --text: #e8eaf0;
  --muted: #98a1b2;
  --accent: #8ab4ff;
  --accent-2: #7ce7c4;
  --radius: 16px;
  --max: 1080px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

[data-theme="light"] {
  --bg: #fbfbfd;
  --bg-soft: #f2f4f8;
  --card: #ffffff;
  --border: #e3e7ee;
  --border-strong: #cfd6e2;
  --text: #14181f;
  --muted: #5c6675;
  --accent: #2f6fed;
  --accent-2: #0f9d76;
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s ease, color 0.25s ease;
}

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

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

h1, h2, h3 { line-height: 1.25; margin: 0 0 0.6em; letter-spacing: -0.02em; }

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 12px;
  z-index: 100;
  background: var(--accent);
  color: #08111f;
  padding: 10px 16px;
  border-radius: 8px;
  font-weight: 600;
}
.skip-link:focus { left: 24px; }

/* ---------------- Header ---------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  /* 不支持 color-mix 的老浏览器退回纯色 */
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 64px;
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}
.brand .dot { color: var(--accent); }

.nav {
  display: flex;
  gap: 28px;
  font-size: 0.945rem;
  color: var(--muted);
}
.nav a {
  position: relative;
  padding: 4px 0;
  transition: color 0.2s ease;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 1.5px;
  width: 0;
  background: var(--accent);
  transition: width 0.28s var(--ease);
}
.nav a:hover { color: var(--text); }
.nav a:hover::after { width: 100%; }

.header-actions { display: flex; align-items: center; gap: 6px; }

.icon-btn {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}
.icon-btn:hover {
  color: var(--text);
  background: var(--bg-soft);
  border-color: var(--border);
}
.icon-btn svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.icon-btn .icon-moon { display: none; }
[data-theme="light"] .icon-btn .icon-sun { display: none; }
[data-theme="light"] .icon-btn .icon-moon { display: block; }

.nav-toggle { display: none; }

/* ---------------- Hero ---------------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(72px, 14vh, 150px) 0 clamp(64px, 10vh, 110px);
}

.hero-glow {
  position: absolute;
  inset: -30% -10% auto -10%;
  height: 70vh;
  background:
    radial-gradient(46% 52% at 22% 32%, color-mix(in srgb, var(--accent) 26%, transparent) 0%, transparent 68%),
    radial-gradient(40% 46% at 78% 18%, color-mix(in srgb, var(--accent-2) 20%, transparent) 0%, transparent 70%);
  filter: blur(18px);
  pointer-events: none;
}

.hero-inner { position: relative; }

.eyebrow {
  margin: 0 0 14px;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1 {
  font-size: clamp(2.6rem, 8.2vw, 4.8rem);
  margin: 0 0 22px;
  letter-spacing: -0.035em;
  background: linear-gradient(120deg, var(--text) 32%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  max-width: 36em;
  margin: 0 0 34px;
  font-size: clamp(1.02rem, 2.2vw, 1.16rem);
  color: var(--muted);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 0.945rem;
  font-weight: 550;
  cursor: pointer;
  transition: transform 0.2s var(--ease), background-color 0.2s ease,
    border-color 0.2s ease, box-shadow 0.2s ease;
}
.btn:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #08111f;
  box-shadow: 0 8px 24px -12px color-mix(in srgb, var(--accent) 80%, transparent);
}
.btn-primary:hover {
  background: color-mix(in srgb, var(--accent) 86%, white);
  border-color: color-mix(in srgb, var(--accent) 86%, white);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.9rem;
  color: var(--muted);
}

/* ---------------- Sections ---------------- */

.section {
  padding: clamp(56px, 8vh, 92px) 0;
  border-top: 1px solid var(--border);
}

.section-title {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-size: clamp(1.45rem, 3.4vw, 1.9rem);
  margin-bottom: 28px;
}
.section-title .idx {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.section-sub {
  margin: -14px 0 32px;
  color: var(--muted);
  font-size: 0.96rem;
}

/* ---------------- About ---------------- */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.prose p {
  margin: 0 0 1.1em;
  color: var(--muted);
  max-width: 40em;
}
.prose p:last-child { margin-bottom: 0; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.skills h3 {
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}
.skills h3:not(:first-of-type) { margin-top: 22px; }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.tags li {
  padding: 4px 11px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  font-size: 0.8rem;
  color: var(--muted);
  white-space: nowrap;
}
.tags.small li { font-size: 0.74rem; padding: 3px 9px; }

/* ---------------- Projects ---------------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(258px, 1fr));
  gap: 18px;
}

.project {
  display: flex;
  flex-direction: column;
  transition: transform 0.28s var(--ease), border-color 0.28s ease,
    box-shadow 0.28s ease;
}
.project:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
  box-shadow: 0 18px 40px -28px color-mix(in srgb, var(--accent) 90%, transparent);
}

.project-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.project-no {
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.project-link {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--muted);
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.project-link:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translate(1px, -1px);
}

.project h3 {
  font-size: 1.06rem;
  margin-bottom: 0.5em;
}
.project h3 a { transition: color 0.2s ease; }
.project h3 a:hover { color: var(--accent); }
.project p {
  margin: 0 0 18px;
  font-size: 0.925rem;
  color: var(--muted);
}
.project .tags { margin-top: auto; }

/* ---------------- 主推项目（大卡片） ---------------- */

.featured {
  display: grid;
  gap: 18px;
  margin-bottom: 18px;
}

.project.feature {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: stretch;
  padding: clamp(22px, 3vw, 32px);
}

.feature-body {
  display: flex;
  flex-direction: column;
}

.feature-body h3 {
  font-size: clamp(1.2rem, 2.6vw, 1.5rem);
  margin-bottom: 0.55em;
}

.feature-body .tags {
  margin-top: 0;
  margin-bottom: 20px;
}

.feature-more {
  margin-top: auto;
  align-self: flex-start;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
  transition: opacity 0.2s ease;
}
.feature-more:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.feature-visual {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg-soft);
  padding: 26px 18px 18px;
  overflow: auto;
}

.visual-label {
  position: absolute;
  top: 9px;
  right: 13px;
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  opacity: 0.65;
}

.flow {
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.775rem;
  line-height: 1.9;
  color: var(--muted);
  white-space: pre;
}

.flow-accent { color: var(--accent); }
.flow-dim { color: var(--text); font-weight: 600; }

@media (max-width: 780px) {
  .project.feature {
    grid-template-columns: 1fr;
    padding: 22px;
  }
  .feature-visual { padding: 24px 16px 16px; }
  .flow { font-size: 0.73rem; }
  .feature-more { margin-top: 18px; }
}

/* ---------------- 演示视频 ---------------- */

.btn-demo {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 16px;
  padding: 8px 16px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 0.865rem;
  font-weight: 550;
  cursor: pointer;
  transition: transform 0.2s var(--ease), border-color 0.2s ease, color 0.2s ease;
}
.btn-demo:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  color: var(--accent);
}
.btn-demo svg {
  width: 12px;
  height: 12px;
  fill: currentColor;
  flex: none;
}
.feature-body .btn-demo {
  margin-top: 0;
  margin-bottom: 20px;
}

/* 弹层 */

.demo-modal[hidden] { display: none; }

.demo-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  padding: 24px;
}

.demo-backdrop {
  position: absolute;
  inset: 0;
  background: rgb(0 0 0 / 0.74);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.demo-dialog {
  position: relative;
  width: min(960px, 100%);
  padding: 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 40px 90px -40px rgb(0 0 0 / 0.8);
}

.demo-video {
  display: block;
  width: 100%;
  max-height: 72vh;
  border-radius: 10px;
  background: #000;
}

.demo-fallback {
  margin: 26px 16px;
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
}
.demo-fallback a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.demo-close {
  position: absolute;
  top: -14px;
  right: -14px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  background: var(--card);
  color: var(--text);
  font-size: 19px;
  line-height: 1;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.demo-close:hover {
  color: var(--accent);
  border-color: var(--accent);
}

@media (max-width: 520px) {
  .demo-modal { padding: 14px; }
  .demo-close { top: 8px; right: 8px; }
  .demo-video { max-height: 60vh; }
}

/* ---------------- Contact ---------------- */

.contact-lede {
  max-width: 34em;
  margin: -4px 0 30px;
  color: var(--muted);
  font-size: 1.03rem;
}

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

/* ---------------- Footer ---------------- */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0 40px;
  font-size: 0.85rem;
  color: var(--muted);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  justify-content: space-between;
}
.site-footer p { margin: 0; }
.site-footer a { text-decoration: underline; text-underline-offset: 3px; }
.site-footer a:hover { color: var(--text); }

/* ---------------- Reveal 动画 ---------------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}
/* JS 没跑起来时也要能看到内容 */
.no-js [data-reveal] {
  opacity: 1;
  transform: none;
}

/* ---------------- 响应式 ---------------- */

@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; }

  .nav-toggle { display: grid; }

  .nav {
    position: absolute;
    top: 65px;
    right: 16px;
    left: 16px;
    flex-direction: column;
    gap: 4px;
    padding: 10px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 24px 48px -28px rgb(0 0 0 / 0.55);
    display: none;
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 10px 12px; border-radius: 8px; }
  .nav a:hover { background: var(--bg-soft); }
  .nav a::after { display: none; }
}

@media (max-width: 520px) {
  .wrap { padding-inline: 18px; }
  .meta { gap: 6px 16px; font-size: 0.85rem; }
  .btn { padding: 10px 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}

@media print {
  .site-header, .hero-glow, .actions, .contact-links { display: none; }
  body { background: #fff; color: #000; }
}