/* ===== 基础 ===== */
:root {
  --bg: #f7f6f3;
  --bg-alt: #ffffff;
  --ink: #1a1d23;
  --ink-soft: #4b5261;
  --ink-faint: #8a90a0;
  --accent: #2f6df6;
  --accent-soft: #e6effe;
  --purple: #7c5cfc;
  --purple-soft: #efebfe;
  --green: #0e9f6e;
  --green-soft: #e2f6ee;
  --line: #e6e4de;
  --radius: 16px;
  --shadow: 0 8px 30px rgba(26, 29, 35, .07);
  --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style-position: inside; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ===== 导航 ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background .3s, box-shadow .3s;
}
.nav.scrolled {
  background: rgba(255, 255, 255, .85);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--line);
}
.nav-inner {
  max-width: 1080px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo { font-weight: 800; font-size: 20px; letter-spacing: .5px; }
.nav-logo span { color: var(--accent); }
.nav-links { display: flex; gap: 26px; align-items: center; }
.nav-links a { font-size: 14.5px; color: var(--ink-soft); transition: color .2s; }
.nav-links a:hover { color: var(--accent); }
.nav-cta {
  background: var(--ink); color: #fff !important;
  padding: 7px 16px; border-radius: 99px; font-size: 13.5px !important;
  transition: background .2s !important;
}
.nav-cta:hover { background: var(--accent); }
.nav-toggle {
  display: none; background: none; border: none; font-size: 22px;
  cursor: pointer; color: var(--ink);
}

/* ===== Hero ===== */
.hero {
  min-height: 100svh;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; position: relative; overflow: hidden;
  padding: 100px 24px 60px;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.orb { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5; }
.orb-1 {
  width: 480px; height: 480px; background: #bcd4ff;
  top: -120px; right: -100px;
  animation: float 9s ease-in-out infinite;
}
.orb-2 {
  width: 420px; height: 420px; background: #ddd2ff;
  bottom: -140px; left: -120px;
  animation: float 11s ease-in-out infinite reverse;
}
@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-30px, 30px); }
}
.grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 45%, #000 20%, transparent 75%);
  opacity: .5;
}
.hero-content { position: relative; z-index: 1; max-width: 820px; }
.hero-eyebrow {
  display: inline-block;
  font-size: 14px; font-weight: 600; letter-spacing: 2px;
  color: var(--accent); background: var(--accent-soft);
  padding: 6px 18px; border-radius: 99px; margin-bottom: 22px;
}
.hero-name {
  font-size: clamp(48px, 9vw, 84px); font-weight: 800;
  letter-spacing: 6px; line-height: 1.15; margin-bottom: 14px;
}
.hero-title {
  font-size: clamp(17px, 2.6vw, 22px); color: var(--ink-soft);
  margin-bottom: 30px;
}
.hero-tags {
  display: flex; flex-wrap: wrap; gap: 10px; justify-content: center;
  margin-bottom: 38px;
}
.tag {
  font-size: 13px; padding: 6px 14px; border-radius: 99px;
  background: #fff; border: 1px solid var(--line); color: var(--ink-soft);
}
.tag-accent {
  background: var(--accent-soft); border-color: transparent; color: var(--accent);
  font-weight: 600;
}
.hero-hint {
  margin-top: 34px; font-size: 14px; letter-spacing: 1px; color: var(--ink-faint);
}
.hero-scroll {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  font-size: 22px; color: var(--ink-faint);
  animation: bounce 1.8s ease-in-out infinite;
}
@keyframes bounce {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 8px); }
}

/* ===== 区块 ===== */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }
.section-title {
  font-size: clamp(26px, 4vw, 34px); font-weight: 800; margin-bottom: 14px;
  display: flex; align-items: baseline; gap: 14px;
}
.section-num {
  font-size: 15px; font-weight: 700; color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.section-lead { color: var(--ink-soft); font-size: 17px; margin-bottom: 44px; max-width: 640px; }

/* ===== 关于我 ===== */
.about-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.about-card {
  background: var(--bg-alt); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px 24px;
  transition: transform .25s, box-shadow .25s;
}
.section-alt .about-card { background: var(--bg); }
.about-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.about-icon { font-size: 30px; margin-bottom: 14px; }
.about-card h3 { font-size: 17px; margin-bottom: 8px; }
.about-card p { font-size: 14px; color: var(--ink-soft); }

/* ===== 时间线 ===== */
.timeline { position: relative; padding-left: 30px; }
.timeline::before {
  content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px;
  width: 2px; background: var(--line);
}
.timeline-item { position: relative; }
.timeline-dot {
  position: absolute; left: -30px; top: 8px;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--accent-soft);
}
.timeline-card {
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px 28px;
}
.timeline-head {
  display: flex; justify-content: space-between; align-items: baseline;
  flex-wrap: wrap; gap: 8px; margin-bottom: 14px;
}
.timeline-head h3 { font-size: 19px; }
.timeline-date {
  font-size: 13.5px; color: var(--accent); font-weight: 600;
  background: var(--accent-soft); padding: 4px 12px; border-radius: 99px;
  white-space: nowrap;
}
.check-list { list-style: none; }
.check-list li {
  position: relative; padding-left: 26px; margin-bottom: 8px;
  color: var(--ink-soft); font-size: 15px;
}
.check-list li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  color: var(--green); font-weight: 700;
}

/* ===== 项目 ===== */
.project {
  background: var(--bg-alt); border: 1px solid var(--line);
  border-radius: 20px; padding: 40px; margin-bottom: 40px;
  box-shadow: var(--shadow);
}
.project-head { margin-bottom: 20px; }
.project-badge {
  display: inline-block; font-size: 12.5px; font-weight: 700;
  padding: 4px 14px; border-radius: 99px; margin-bottom: 12px;
}
.badge-blue { background: var(--accent-soft); color: var(--accent); }
.badge-purple { background: var(--purple-soft); color: var(--purple); }
.badge-green { background: var(--green-soft); color: var(--green); }
.project-head h3 { font-size: clamp(21px, 3vw, 26px); margin-bottom: 6px; }
.project-sub { color: var(--ink-faint); font-size: 14.5px; }
.project-desc { color: var(--ink-soft); margin-bottom: 28px; max-width: 760px; }
.project-list { font-size: 15px; }

/* 前后对比 */
.compare {
  display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 30px;
}
.compare-col { border-radius: var(--radius); padding: 24px 26px; }
.compare-col h4 { font-size: 16px; margin-bottom: 14px; }
.compare-col ol { list-style: none; counter-reset: item; }
.compare-col li {
  counter-increment: item; position: relative;
  padding-left: 30px; margin-bottom: 10px;
  font-size: 13.8px; color: var(--ink-soft); line-height: 1.6;
}
.compare-col li::before {
  content: counter(item); position: absolute; left: 0; top: 2px;
  width: 20px; height: 20px; border-radius: 6px;
  font-size: 11.5px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.compare-before { background: #fdf1ef; border: 1px solid #f6dcd6; }
.compare-before li::before { background: #f6dcd6; color: #c0432b; }
.compare-after { background: #edf7f2; border: 1px solid #cdeadd; }
.compare-after li::before { background: #cdeadd; color: var(--green); }

/* 流程图 */
.flow {
  display: flex; align-items: stretch; gap: 10px;
  margin-bottom: 30px; flex-wrap: wrap;
}
.flow-step {
  flex: 1; min-width: 150px;
  background: var(--purple-soft); border: 1px solid #ddd2fb;
  border-radius: var(--radius); padding: 20px 18px; text-align: center;
}
.flow-num {
  width: 32px; height: 32px; margin: 0 auto 10px;
  background: var(--purple); color: #fff; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 15px;
}
.flow-step h4 { font-size: 15px; margin-bottom: 6px; }
.flow-step p { font-size: 12.8px; color: var(--ink-soft); line-height: 1.55; }
.flow-arrow {
  align-self: center; color: var(--purple); font-size: 20px; font-weight: 700;
}

.notes {
  background: #fff8e8; border: 1px solid #f3e3b3;
  border-radius: var(--radius); padding: 22px 26px; margin-bottom: 30px;
}
.notes h4 { font-size: 15.5px; margin-bottom: 10px; }
.notes ul { list-style: none; }
.notes li {
  position: relative; padding-left: 20px; margin-bottom: 7px;
  font-size: 13.8px; color: var(--ink-soft);
}
.notes li::before { content: "▸"; position: absolute; left: 0; color: #d9a514; }

/* 媒体 */
.media-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 24px;
}
.media-item img, .media-single img {
  border-radius: 12px; border: 1px solid var(--line);
  transition: transform .25s, box-shadow .25s; cursor: zoom-in;
  width: 100%;
}
.media-item img:hover, .media-single img:hover {
  transform: scale(1.015); box-shadow: var(--shadow);
}
figcaption {
  text-align: center; font-size: 13px; color: var(--ink-faint); margin-top: 10px;
}
.media-video video {
  width: 100%; border-radius: 12px; border: 1px solid var(--line);
  background: #000;
}
.media-single { max-width: 760px; margin: 0 auto; }

/* ===== 教育 ===== */
.edu-card {
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px 32px;
}
.edu-head {
  display: flex; justify-content: space-between; align-items: flex-start;
  flex-wrap: wrap; gap: 10px; margin-bottom: 14px;
}
.edu-head h3 { font-size: 21px; }
.edu-major { color: var(--ink-soft); font-size: 15px; margin-top: 4px; }
.edu-courses { font-size: 14px; color: var(--ink-soft); }

/* ===== 技能 ===== */
.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.skills-card {
  background: var(--bg-alt); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px 26px;
}
.skills-card h3 { font-size: 17px; margin-bottom: 20px; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.skill-tags .tag { font-size: 13.5px; padding: 7px 16px; }
.cert-list { list-style: none; }
.cert-list li {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 0; border-bottom: 1px dashed var(--line);
}
.cert-list li:last-child { border-bottom: none; }
.cert-name { font-size: 14.5px; font-weight: 600; }
.cert-note { font-size: 12.5px; color: var(--ink-faint); }

/* ===== 联系 ===== */
.section-contact { background: var(--ink); color: #fff; }
.section-contact .section-title { color: #fff; }
.section-contact .section-lead { color: #a8b0c0; }
.contact-cards { display: flex; gap: 20px; flex-wrap: wrap; }
.contact-card {
  display: flex; align-items: center; gap: 16px;
  background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .12);
  border-radius: var(--radius); padding: 22px 30px;
  transition: background .25s, transform .25s;
}
.contact-card:hover { background: rgba(255, 255, 255, .12); transform: translateY(-3px); }
.contact-icon { font-size: 28px; }
.contact-label { font-size: 12.5px; color: #a8b0c0; }
.contact-value { font-size: 18px; font-weight: 700; letter-spacing: .5px; }

/* ===== 页脚 ===== */
.footer {
  background: var(--ink); color: #6b7280; text-align: center;
  padding: 26px 20px; font-size: 13px;
  border-top: 1px solid rgba(255, 255, 255, .08);
}

/* ===== 灯箱 ===== */
.lightbox {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(15, 17, 22, .9); backdrop-filter: blur(6px);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 40px; opacity: 0; pointer-events: none; transition: opacity .25s;
}
.lightbox.open { opacity: 1; pointer-events: auto; }
.lightbox img {
  max-width: 92vw; max-height: 82vh; border-radius: 10px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .5);
}
.lightbox p { color: #cfd4de; font-size: 14px; margin-top: 16px; }
.lightbox-close {
  position: absolute; top: 20px; right: 28px;
  background: none; border: none; color: #fff; font-size: 36px; cursor: pointer;
  line-height: 1;
}

/* ===== 滚动入场动画 ===== */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ===== 响应式 ===== */
@media (max-width: 860px) {
  .about-grid, .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .compare { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .about-grid, .skills-grid, .media-grid { grid-template-columns: 1fr; }
  .project { padding: 26px 20px; }
  .flow-arrow { transform: rotate(90deg); width: 100%; text-align: center; }
  .nav-links {
    position: fixed; top: 58px; right: 0; left: 0;
    background: #fff; flex-direction: column; gap: 0;
    padding: 8px 0; box-shadow: 0 12px 24px rgba(0, 0, 0, .08);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { width: 100%; text-align: center; padding: 12px 0; }
  .nav-cta { border-radius: 0; background: none; color: var(--accent) !important; font-weight: 700; }
  .nav-toggle { display: block; }
  .section { padding: 64px 0; }
  .contact-cards { flex-direction: column; }
}