:root {
  --bg: #F7F7F5;
  --card: #FFFFFF;
  --ink: #111111;
  --ink-2: #6B6B6B;
  --ink-3: #9A9A9A;
  --accent: #FF5C1A;
  --border: #EBEBE9;
  --border-light: #F2F2F0;
  --radius-lg: 24px;
  --radius-md: 20px;
  --radius-sm: 12px;
  --font-sans: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ===== 可访问性 ===== */
.skip-link {
  position: absolute;
  top: -48px;
  left: 16px;
  z-index: 200;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: 999px;
  transition: top .2s;
}

.skip-link:focus {
  top: 16px;
}

/* 全局焦点指示器 */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

/* ===== 导航栏 ===== */
.navbar-wrap {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 24px 120px;
  background: var(--bg);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 10px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.brand-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
}

.brand-text {
  font-size: 20px;
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-2);
  padding: 8px 12px;
  transition: color .2s;
}

.nav-link:hover { color: var(--ink); }
.nav-link.active { color: var(--ink); font-weight: 600; }

.nav-cta {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  padding: 10px 22px;
  border-radius: 999px;
  flex-shrink: 0;
  transition: opacity .2s;
}

.nav-cta:hover { opacity: .88; }

/* ===== 通用 Section ===== */
.section {
  max-width: 1440px;
  margin: 0 auto;
  padding: 60px 120px 80px;
}

.section-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  text-align: center;
  margin-bottom: 48px;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--accent);
  background: rgba(255, 92, 26, 0.08);
  border: 1px solid rgba(255, 92, 26, 0.16);
  border-radius: 999px;
  padding: 6px 16px;
  margin-bottom: 20px;
}

.section-label::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.section-title {
  font-size: 44px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-intro {
  font-size: 17px;
  line-height: 1.75;
  color: #5A5A5A;
  max-width: 560px;
  margin-bottom: 12px;
}

/* ===== 首页 Hero ===== */
.home { padding-top: 40px; }

.hero-row {
  display: flex;
  align-items: stretch;
  gap: 24px;
}

.avatar-card {
  flex: 0 0 340px;
  height: 420px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.avatar {
  width: 100%;
  height: 300px;
  border-radius: 16px;
  overflow: hidden;
  background: #EDEAE4;
  flex-shrink: 0;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.avatar-body {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.avatar-name { font-size: 24px; font-weight: 700; }
.avatar-role { font-size: 15px; font-weight: 500; color: var(--ink-2); }

.hero-card {
  flex: 1;
  height: 420px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 24px;
}

.hero-title {
  font-size: 52px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

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

.hero-desc {
  font-size: 18px;
  color: var(--ink-2);
  line-height: 1.7;
  max-width: 620px;
}

/* ===== 关于我 ===== */

/* 个人 ID 卡片 */
.id-card {
  display: flex;
  align-items: stretch;
  gap: 32px;
  max-width: 560px;
  margin: 0 auto 40px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.id-photo {
  flex: 0 0 160px;
  width: 160px;
  height: 200px;
  border-radius: 16px;
  overflow: hidden;
  background: var(--border-light);
}

.id-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.id-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 16px;
}

.id-name {
  font-size: 26px;
  font-weight: 700;
}

.id-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.id-row {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
}

.id-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.id-key {
  flex: 0 0 72px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-3);
}

.id-value {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

/* 数字亮点 */
.stats {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
}

.stat {
  flex: 1;
  max-width: 240px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
}

.stat-num {
  font-size: 44px;
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-2);
}

/* 技能标签墙 */
.skills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 56px;
}

.skill-tag {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 9px 20px;
  transition: border-color .2s, color .2s, background .2s;
}

.skill-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(255, 92, 26, 0.04);
}

/* 时间线（左右交错） */
.timeline {
  position: relative;
  max-width: 960px;
  margin: 0 auto;
  padding: 8px 0;
}

/* 中央贯穿竖线 */
.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 24px;
  bottom: 24px;
  width: 2px;
  transform: translateX(-50%);
  background: var(--border);
  border-radius: 2px;
}

.exp-item {
  position: relative;
  display: flex;
  align-items: flex-start;
  width: 50%;
  padding: 24px 0;
}

/* 奇数条：内容在左 */
.exp-item:nth-child(odd) {
  padding-right: 48px;
  flex-direction: row-reverse;
}

/* 偶数条：内容在右 */
.exp-item:nth-child(even) {
  margin-left: 50%;
  padding-left: 48px;
}

/* 时间节点圆点（置于中央竖线上） */
.exp-item::before {
  content: "";
  position: absolute;
  top: 36px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--border);
  z-index: 1;
  transition: border-color .25s, background .25s;
}

.exp-item:nth-child(odd)::before {
  right: -6px;
}

.exp-item:nth-child(even)::before {
  left: -6px;
}

.exp-item.current::before {
  background: var(--accent);
  border-color: var(--accent);
}

.exp-item:hover::before {
  border-color: var(--accent);
}

.exp-item.current:hover::before {
  background: var(--accent);
  border-color: var(--accent);
}

.exp-year {
  flex-shrink: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 16px;
  text-align: center;
  white-space: nowrap;
}

.exp-year-current {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.exp-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform .3s cubic-bezier(.2, .7, .3, 1);
}

.exp-item:nth-child(odd) .exp-body {
  text-align: right;
  transform-origin: right center;
}

.exp-item:nth-child(even) .exp-body {
  text-align: left;
  transform-origin: left center;
}

.exp-item:hover .exp-body {
  transform: scale(1.03);
}

.exp-title { font-size: 22px; font-weight: 700; }
.exp-desc { font-size: 16px; color: var(--ink-2); line-height: 1.6; }

/* 理念引用 */
.quote {
  max-width: 720px;
  margin: 48px auto 0;
  text-align: center;
  padding: 32px 40px;
  border-left: none;
  border-top: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
}

.quote p {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.quote footer {
  margin-top: 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--accent);
}

/* 精选成果 */
.featured {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 48px;
}

.featured-card {
  flex: 1;
  max-width: 320px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}

.featured-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(17,17,17,.08);
  border-color: var(--accent);
}

.featured-name {
  font-size: 18px;
  font-weight: 700;
}

.featured-desc {
  font-size: 14px;
  color: var(--ink-2);
}

.featured-arrow {
  font-size: 20px;
  color: var(--accent);
  flex-shrink: 0;
}



/* ===== 视频 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 280px);
  justify-content: center;
  gap: 24px;
}

.video-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  transition: transform .25s, box-shadow .25s;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(17,17,17,.08);
}

.video-thumb {
  position: relative;
  width: 240px;
  height: 320px;
  flex-shrink: 0;
  border-radius: 12px;
  overflow: hidden;
  background: #EFEFED;
}

.video-thumb.ph {
  background: #EFEFED;
}

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0,0,0,.15);
}

.ph-plus {
  color: #C9C9C9;
  font-size: 24px;
  box-shadow: none;
  background: #fff;
}

.video-title {
  font-size: 18px;
  font-weight: 700;
  width: 100%;
  text-align: left;
  line-height: 1.4;
  min-height: 50px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  font-size: 14px;
  color: var(--ink-3);
  width: 100%;
  text-align: left;
  margin-top: auto;
}

.video-card.placeholder .video-title { color: var(--ink-3); }
.video-card.placeholder .video-meta { color: #C9C9C9; }

/* ===== 产品 ===== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.product-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: transform .25s, box-shadow .25s;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(17,17,17,.08);
}

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

.product-title { font-size: 22px; font-weight: 700; }

.product-tag {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-3);
  white-space: nowrap;
}

.product-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 16px;
  overflow: hidden;
  background: var(--border-light);
}

.product-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* ===== 联系我 ===== */
.social-grid {
  display: flex;
  flex-wrap: nowrap;
  justify-content: center;
  gap: 16px;
}

.social-card {
  flex: 1 1 0;
  min-width: 0;
  max-width: 260px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
  transition: transform .25s, box-shadow .25s;
}

.social-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(17,17,17,.08);
}

.social-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 22px;
  font-weight: 700;
}

.social-name { font-size: 16px; font-weight: 700; }
.social-handle { font-size: 13px; color: var(--ink-2); }

/* ===== 页脚 ===== */
.footer {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 120px;
  border-top: 1px solid var(--border-light);
}

.footer-text { font-size: 14px; font-weight: 500; color: var(--ink-3); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .navbar-wrap { padding: 20px 40px; }
  .section { padding: 48px 40px 64px; }
  .footer { padding: 32px 40px; }
  .hero-title { font-size: 40px; }
  .section-title { font-size: 40px; }
  .product-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .navbar-wrap { padding: 16px 20px; }
  .navbar { padding: 10px 16px; }
  .brand-text { font-size: 18px; }
  .nav-links { gap: 16px; }
  .nav-link { font-size: 14px; }
  .nav-cta { padding: 8px 16px; font-size: 14px; }
  .section { padding: 40px 20px 56px; }
  .footer { padding: 28px 20px; }
  .hero-row { flex-direction: column; }
  .avatar-card { flex: 1; height: auto; }
  .avatar { aspect-ratio: 1 / 1; height: auto; }
  .hero-card { height: auto; padding: 32px 24px; }
  .hero-title { font-size: 30px; }
  .hero-desc { font-size: 16px; }
  .section-title { font-size: 30px; }
  .id-card { flex-direction: column; align-items: center; gap: 20px; }
  .id-photo { flex: none; width: 200px; height: 250px; }
  .id-info { width: 100%; }
  .id-name { text-align: center; }
  /* 时间线移动端：单列左对齐 */
  .timeline { max-width: 100%; }
  .timeline::before { left: 10px; transform: none; }
  .exp-item,
  .exp-item:nth-child(odd),
  .exp-item:nth-child(even) {
    width: 100%;
    margin-left: 0;
    flex-direction: row;
    padding: 20px 0 20px 32px;
  }
  .exp-item:nth-child(odd)::before,
  .exp-item:nth-child(even)::before {
    left: 4px;
    right: auto;
  }
  .exp-item:nth-child(odd) .exp-body { text-align: left; transform-origin: left center; }
  .stats { flex-direction: column; align-items: center; }
  .stat { width: 100%; max-width: 320px; }
  .featured { flex-direction: column; align-items: center; }
  .featured-card { width: 100%; max-width: 320px; }
  .quote { padding: 28px 24px; }
  .quote p { font-size: 20px; }
  .video-grid { grid-template-columns: 1fr; max-width: 320px; margin: 0 auto; }
  .social-card { flex: 1 1 100%; max-width: 320px; }
  .social-grid { flex-wrap: wrap; }
  .social-card { flex: 1 1 calc(50% - 8px); max-width: none; }
}