/* ===== 设计系统 ===== */
:root {
  --bg: #0A0A0A;
  --surface: #111111;
  --surface-2: #1A1A1A;
  --accent: #C6F24E;
  --text: #F5F5F5;
  --text-dim: #B0B0B0;
  --muted: #8A8A8A;
  --line: rgba(245,245,245,0.12);
  --overlay: rgba(0,0,0,0.55);
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-framer: cubic-bezier(0.44, 0, 0.56, 1);
  --ease-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Helvetica Neue", Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden; /* 兼容旧浏览器 */
  overflow-x: clip;   /* 现代浏览器：不建立滚动容器，避免破坏 position: sticky */
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; background: none; border: none; cursor: pointer; }

.skip-link {
  position: absolute; left: -9999px; z-index: 9999;
  padding: 0.5rem 1rem; background: var(--accent); color: var(--bg);
}
.skip-link:focus { left: 1rem; top: 1rem; }

/* ===== Header ===== */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  display: grid; grid-template-columns: auto 1fr auto;
  align-items: center; gap: 1.5rem;
  padding: 1.25rem clamp(1rem, 4vw, 3rem);
  pointer-events: none;
}
.site-header > * { pointer-events: auto; }
.site-header.scrolled {
  background: rgba(10,10,10,0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.logo {
  display: inline-flex; align-items: center; gap: 0.6rem;
  opacity: 0; transform: translateY(-1.5rem);
  animation: logoIn 1s var(--ease-out-expo) 0.15s forwards;
}
.logo-mark {
  display: grid; place-items: center;
  width: 2.25rem; height: 2.25rem;
  border: 1px solid var(--line);
  border-radius: 50%;
  font-size: 0.7rem; font-weight: 800; letter-spacing: 0.05em;
}
.logo-text { font-size: 0.95rem; font-weight: 700; letter-spacing: 0.04em; }

.main-nav {
  display: none; justify-self: end; align-items: center; gap: 0.4rem;
}
.main-nav a {
  position: relative;
  padding: 0.5rem 0.9rem;
  font-size: 0.8rem; font-weight: 600; letter-spacing: 0.04em;
  color: var(--text-dim);
  opacity: 0; transform: translateY(-1rem);
  animation: navIn 0.8s var(--ease-out-expo) forwards;
}
.main-nav a::before {
  content: ""; margin-right: 0;
}
.main-nav a:hover { color: var(--text); }
.main-nav a::after {
  content: ""; position: absolute; left: 0.9rem; right: 0.9rem; bottom: 0.2rem;
  height: 1px; background: var(--accent);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.35s var(--ease-out-expo);
}
.main-nav a:hover::after { transform: scaleX(1); }
.main-nav a:nth-child(1) { animation-delay: 0.35s; }
.main-nav a:nth-child(2) { animation-delay: 0.45s; }
.main-nav a:nth-child(3) { animation-delay: 0.55s; }

.profile-chip {
  display: none; align-items: center; gap: 0.75rem;
  padding: 0.4rem 0.9rem 0.4rem 0.4rem;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--line); border-radius: 999px;
  backdrop-filter: blur(10px);
  opacity: 0; transform: translateY(-1rem);
  animation: navIn 0.9s var(--ease-out-expo) 0.6s forwards;
  transition: background 0.3s, border-color 0.3s;
}
.profile-chip:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.2); }
.profile-chip img { width: 2.2rem; height: 2.2rem; object-fit: cover; border-radius: 50%; }
.profile-meta { display: flex; flex-direction: column; line-height: 1.2; }
.profile-name { font-size: 0.8rem; font-weight: 700; }
.profile-role { font-size: 0.65rem; color: var(--muted); letter-spacing: 0.04em; }

.menu-toggle {
  display: grid; place-items: center; gap: 0.35rem;
  width: 2.5rem; height: 2.5rem;
  border: 1px solid var(--line); border-radius: 50%;
}
.menu-toggle span {
  display: block; width: 1rem; height: 1.5px; background: var(--text);
  transition: transform 0.3s, opacity 0.3s;
}

.mobile-menu {
  position: fixed; inset: 0; z-index: 90;
  display: grid; place-items: center;
  background: rgba(10,10,10,0.96);
  backdrop-filter: blur(20px);
  opacity: 0; pointer-events: none;
  transition: opacity 0.4s var(--ease-framer);
}
.mobile-menu[aria-hidden="false"] { opacity: 1; pointer-events: auto; }
.mobile-menu nav { display: flex; flex-direction: column; gap: 1.5rem; text-align: center; }
.mobile-menu a { font-size: clamp(1.8rem, 8vw, 3.5rem); font-weight: 800; color: var(--text); }
.mobile-menu a:hover { color: var(--accent); }

body.menu-open { overflow: hidden; }
body.menu-open .menu-toggle span:nth-child(1) { transform: translateY(0.2rem) rotate(45deg); }
body.menu-open .menu-toggle span:nth-child(2) { transform: translateY(-0.25rem) rotate(-45deg); }

@media (min-width: 768px) {
  .main-nav { display: flex; }
  .profile-chip { display: flex; }
  .menu-toggle { display: none; }
}

/* ===== Hero 首屏 ===== */
.hero {
  position: relative;
  min-height: 100dvh; min-height: 100vh;
  display: flex; align-items: center;
  padding: 0;
  overflow: hidden;
}

.hero-media {
  position: absolute; inset: 0; z-index: -2;
  background: var(--bg);
}
.hero-media video {
  width: 100%; height: 100%; object-fit: cover;
  object-position: 66% center;       /* 把人像推到画面右侧，避开左侧文字 */
  transform: scale(1.08); opacity: 0;
  animation: videoIn 1.4s var(--ease-framer) forwards;
}
.hero-poster-fallback {
  position: absolute; inset: 0; z-index: -1;
  background: url('hero-poster.jpg') 66% center/cover no-repeat;
  opacity: 1; transition: opacity 0.6s;
}
.hero-media.video-playing .hero-poster-fallback { opacity: 0; }

/* 左侧暗渐变遮罩——保护文字区，不破坏右侧视频 */
.hero-overlay {
  position: absolute; inset: 0; z-index: 0;
  background:
    linear-gradient(180deg, rgba(10,10,10,0.35) 0%, rgba(10,10,10,0.15) 30%, rgba(10,10,10,0.55) 70%, rgba(10,10,10,0.85) 100%),
    linear-gradient(90deg,
      rgba(10,10,10,0.96) 0%,
      rgba(10,10,10,0.88) 24%,
      rgba(10,10,10,0.62) 42%,
      rgba(10,10,10,0.28) 56%,
      transparent 72%);
}

/* 文字内容限定在左半区 */
.hero-content {
  position: relative; z-index: 2;
  width: min(46vw, 540px);
  padding: 0 0 0 6vw;
}

.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  margin: 0 0 1.1rem; padding: 0.35rem 0.8rem;
  border: 1px solid var(--line); border-radius: 999px;
  font-size: 0.7rem; font-weight: 600; letter-spacing: 0.08em;
  color: var(--text-dim);
  background: rgba(10,10,10,0.4);
  backdrop-filter: blur(4px);
  opacity: 0; transform: translateY(1.5rem);
  animation: textUp 0.9s var(--ease-out-expo) 0.75s forwards;
}
.hero-eyebrow .dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

.hero-title {
  margin: 0 0 1.5rem;
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.08; font-weight: 800; letter-spacing: -0.03em;
  text-shadow: 0 2px 24px rgba(0,0,0,0.7), 0 1px 4px rgba(0,0,0,0.5);
}
.hero-title .line {
  display: block; overflow: hidden;
}
.hero-title .word {
  display: block; white-space: nowrap;
  transform: translateY(110%); opacity: 0;
  animation: lineUp 1s var(--ease-out-expo) forwards;
}
.hero-title .line:nth-child(1) .word { animation-delay: 0.55s; }
.hero-title .line:nth-child(2) .word { animation-delay: 0.7s; }
.hero-title .line:nth-child(3) .word { animation-delay: 0.85s; }
.hero-title .accent { color: var(--accent); }

.hero-desc {
  max-width: 36rem; margin: 0 0 2rem;
  font-size: clamp(0.9rem, 1.4vw, 1.05rem);
  line-height: 1.7; color: var(--text-dim);
  text-shadow: 0 1px 6px rgba(0,0,0,0.55);
  opacity: 0; transform: translateY(1rem);
  animation: textUp 0.9s var(--ease-out-expo) 1s forwards;
}

.hero-cta {
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.85rem 1.6rem;
  background: var(--text); color: var(--bg);
  border-radius: 999px;
  font-size: 0.85rem; font-weight: 700;
  box-shadow: 0 6px 28px rgba(0,0,0,0.45);
  opacity: 0; transform: translateY(1rem);
  animation: textUp 0.9s var(--ease-out-expo) 1.1s forwards;
  transition: transform 0.3s var(--ease-out-expo), background 0.3s;
}
.hero-cta:hover { transform: translateY(-2px); background: var(--accent); }
.hero-cta svg { transition: transform 0.3s; }
.hero-cta:hover svg { transform: translateX(3px); }

/* 首屏双 CTA：查看作品 + 查看 AI 工作流 */
.hero-cta-row { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.hero-cta-row + .hero-cta-row { margin-top: 0.75rem; }
.hero-cta-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
  box-shadow: none;
}
.hero-cta.hero-cta-ghost:hover {
  background: transparent;
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}
.hero-cta-ghost svg { transition: transform 0.3s; }
.hero-cta-ghost:hover svg { transform: translateX(3px); }

.scroll-hint {
  position: absolute; right: clamp(1rem, 4vw, 3rem); bottom: 4.5rem; z-index: 2;
  display: flex; flex-direction: column; align-items: center; gap: 0.6rem;
  font-size: 0.6rem; letter-spacing: 0.15em; color: var(--muted);
  text-transform: uppercase;
  opacity: 0; animation: fadeIn 1s ease 2s forwards;
}
.scroll-line {
  width: 1px; height: 3rem; background: var(--line);
  position: relative; overflow: hidden;
}
.scroll-line::after {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 40%;
  background: var(--accent);
  animation: scrollLine 1.6s ease-in-out infinite;
}

/* 移动端：把内容堆到下方，渐变方向反转 */
@media (max-width: 767px) {
  .hero { align-items: end; padding: 0 0 2.2rem; }
  .hero-media video { object-position: 55% 18%; transform: scale(1.12); }
  .hero-poster-fallback { background-position: 55% 18%; }
  .hero-overlay {
    background:
      linear-gradient(180deg,
        rgba(10,10,10,0.18) 0%,
        rgba(10,10,10,0.55) 32%,
        rgba(10,10,10,0.90) 68%,
        rgba(10,10,10,0.98) 100%);
  }
  .hero-content { width: 100%; padding: 0 1.25rem; }
  .hero-eyebrow { font-size: 0.62rem; padding: 0.28rem 0.65rem; }
  .hero-title { font-size: clamp(1.75rem, 7.2vw, 2.4rem); margin-bottom: 0.9rem; }
  .hero-desc { font-size: 0.88rem; line-height: 1.65; margin-bottom: 1.4rem; }
  .hero-cta { padding: 0.75rem 1.3rem; font-size: 0.8rem; }
  .hero-title .word { white-space: normal; } /* 窄屏允许换行，避免长标题/放大字号被裁切 */
  .scroll-hint { display: none; }
}

/* ===== Sections common ===== */
.section-eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.18em; color: var(--accent);
}
.section-header { max-width: 1200px; margin: 0 auto; padding: 0 clamp(1rem, 4vw, 3rem) 2.5rem; }
.section-header h2, .about-content h2, .contact-heading h2 {
  margin: 0 0 0.6rem; font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; letter-spacing: -0.03em;
}
/* 中英对照：英文同行、字号小、字距宽、弱色 */
.title-en {
  margin-left: 0.9rem;
  font-size: 0.28em; font-weight: 600; letter-spacing: 0.16em;
  color: var(--accent); vertical-align: middle; white-space: nowrap;
}
/* 窄屏时英文换行到下一行，避免挤压标题 */
@media (max-width: 767px) {
  .title-en { display: block; margin: 0.35rem 0 0; font-size: 0.24em; }
}
.section-sub { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* ===== Works ===== */
.works {
  padding: 8rem 0 5rem;
  background: var(--bg);
}
.works-grid {
  display: grid; gap: 1.25rem;
  max-width: 1200px; margin: 0 auto; padding: 0 clamp(1rem, 4vw, 3rem);
}
@media (min-width: 768px) {
  .works-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1100px) {
  .works-grid { grid-template-columns: repeat(3, 1fr); }
  /* 6 卡：2 行 × 3 列，无需特殊居中对齐 */
}

.work-card {
  position: relative;
  background: var(--surface); border: 1px solid var(--line); border-radius: 1rem;
  overflow: hidden;
  opacity: 0; transform: translateY(3rem);
  transition: transform 0.4s var(--ease-out-expo), border-color 0.4s, box-shadow 0.4s;
}
.work-card.revealed { animation: cardUp 0.9s var(--ease-out-expo) forwards; }
.work-card:hover { transform: translateY(-6px); border-color: rgba(198,242,78,0.35); box-shadow: 0 24px 60px rgba(0,0,0,0.45); }
.work-card:nth-child(1).revealed { animation-delay: 0s; }
.work-card:nth-child(2).revealed { animation-delay: 0.12s; }
.work-card:nth-child(3).revealed { animation-delay: 0.24s; }
.work-card:nth-child(4).revealed { animation-delay: 0.36s; }
.work-card:nth-child(5).revealed { animation-delay: 0.48s; }
.work-card:nth-child(6).revealed { animation-delay: 0.60s; }

.card-link { display: block; width: 100%; text-align: left; color: inherit; }
.card-media {
  position: relative; aspect-ratio: 4 / 5; overflow: hidden;
  background: var(--surface-2);
}
.card-media img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.7s var(--ease-out-expo);
}
.work-card:hover .card-media img { transform: scale(1.06) translate(var(--card-x, 0), var(--card-y, 0)); }
.card-shade {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0.35) 0%, rgba(0,0,0,0.65) 55%, rgba(0,0,0,0.92) 100%);
  opacity: 0.9; transition: opacity 0.4s;
}
.work-card:hover .card-shade { opacity: 1; }
.card-info h3, .card-info p, .card-tags span { text-shadow: 0 1px 10px rgba(0,0,0,0.85); }

.card-info {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 1.5rem;
}
.card-meta {
  display: flex; align-items: center; justify-content: space-between; gap: 0.7rem; margin-bottom: 0.75rem;
}
.card-cat {
  font-size: 0.6rem; font-weight: 600; letter-spacing: 0.1em; color: var(--accent); text-transform: uppercase;
}
.card-year {
  font-size: 0.6rem; font-weight: 500; letter-spacing: 0.04em; color: var(--muted);
}
.card-info h3 {
  margin: 0 0 0.5rem; font-size: 1.4rem; font-weight: 800; letter-spacing: -0.02em;
}
.card-info p {
  margin: 0 0 1rem; font-size: 0.85rem; line-height: 1.55; color: var(--text-dim);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.card-tags span {
  padding: 0.25rem 0.55rem;
  border: 1px solid rgba(245,245,245,0.12); border-radius: 999px;
  font-size: 0.6rem; color: var(--muted);
}

/* 与作品列表保持同一动效语言：悬停时给出明确的下一步反馈 */
.card-media::after {
  content: "VIEW PROJECT ↗";
  position: absolute; top: 1rem; right: 1rem; z-index: 2;
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  background: var(--accent); color: var(--bg);
  font-size: 0.58rem; font-weight: 800; letter-spacing: 0.08em;
  opacity: 0; transform: translateY(-0.5rem);
  transition: opacity 0.3s var(--ease-out-expo), transform 0.3s var(--ease-out-expo);
}
.work-card:hover .card-media::after,
.work-card:focus-within .card-media::after { opacity: 1; transform: translateY(0); }

/* ===== About ===== */
.about {
  padding: 6rem 0;
  background: var(--surface);
  border-top: 1px solid var(--line);
}
.about-grid {
  display: grid; gap: 2.5rem;
  max-width: 1200px; margin: 0 auto; padding: 0 clamp(1rem, 4vw, 3rem);
}
/* 左右分栏：左为个人信息，右为工具链面板 */
.about-side {
  background: var(--surface-2);
  border: 1px solid var(--line); border-radius: 0.75rem;
  padding: 1.6rem 1.5rem;
}
.about-side .tool-grid { grid-template-columns: 1fr; margin-top: 1.1rem; }
.about-side .skills { margin: 0; }
@media (min-width: 900px) {
  .about-grid { grid-template-columns: 1.15fr 0.85fr; align-items: start; gap: 3rem; }
  .about-side { position: sticky; top: 96px; }
}

.about-visual {
  position: relative;
  opacity: 0; transform: translateY(2rem);
}
.about-visual.revealed { animation: revealUp 0.9s var(--ease-out-expo) forwards; }
.about-visual img {
  width: 100%; max-width: 360px; aspect-ratio: 3 / 4; object-fit: cover;
  border-radius: 1rem; border: 1px solid var(--line);
}
.about-visual-caption {
  position: absolute; left: 1rem; bottom: -0.75rem;
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.5rem 1rem;
  background: var(--bg); border: 1px solid var(--line); border-radius: 999px;
  font-size: 0.75rem; font-weight: 700;
}
.about-visual-caption span:last-child { color: var(--muted); font-weight: 500; }

.about-content { opacity: 0; transform: translateY(2rem); }
.about-content.revealed { animation: revealUp 0.9s var(--ease-out-expo) 0.15s forwards; }

.about-header { margin-bottom: 1.5rem; }
/* 姓名字号比主标题小 1-2 号，拉开视觉层级 */
.about-header h2 { margin: 0 0 0.5rem; font-size: clamp(1.6rem, 3.2vw, 2.2rem); }
.about-role {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--line); border-radius: 999px;
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.06em;
  color: var(--text-dim); background: rgba(10,10,10,0.35);
}
.about-role .dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

.about-bio { margin: 0 0 1.5rem; }
.about-bio p {
  font-size: 0.92rem; line-height: 1.85; color: var(--text-dim); margin: 0 0 0.9rem;
}
.about-bio p:last-child { margin-bottom: 0; }

.edu-block { margin: 2rem 0; }
.edu-block h3, .skills h3, .skill-groups h3 { font-size: 0.75rem; letter-spacing: 0.15em; color: var(--accent); margin: 0 0 0.75rem; }
.h3-en { margin-left: 0.6rem; color: var(--muted); font-weight: 500; letter-spacing: 0.14em; }
.edu-block p { margin: 0; font-size: 0.95rem; color: var(--text-dim); }
.edu-block strong { color: var(--text); }
.edu-block .muted { color: var(--muted); margin-left: 0.5rem; }

.skill-groups { margin: 2rem 0; }
.skill-groups h3 { margin-bottom: 1rem; }
.skill-group {
  padding: 1rem 0; border-bottom: 1px solid var(--line);
  display: grid; gap: 0.35rem;
}
.skill-group:first-of-type { padding-top: 0; }
.skill-label {
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.1em; color: var(--text);
}
.skill-items { font-size: 0.85rem; line-height: 1.6; color: var(--text-dim); }

.timeline { margin: 2rem 0; }
.timeline h3 { margin-bottom: 1rem; }
.timeline ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.85rem; }
.timeline li {
  display: grid; gap: 0.15rem;
  padding-left: 1rem; border-left: 1px solid var(--line);
}
.timeline li:hover { border-left-color: var(--accent); }
.tl-date { font-size: 0.7rem; color: var(--muted); letter-spacing: 0.04em; }
.tl-title { font-size: 0.88rem; color: var(--text-dim); line-height: 1.5; }

.skills { margin: 2rem 0; }
.skills h3 { margin-bottom: 1rem; }
.skill-list { list-style: none; padding: 0; margin: 0 0 1.25rem; display: grid; gap: 0.75rem; }
.skill-list li {
  display: grid; grid-template-columns: 8.5rem 1fr 2.5rem; align-items: center; gap: 0.75rem;
  font-size: 0.82rem; color: var(--text-dim);
}
.skill-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.skill-bar {
  height: 4px; background: rgba(245,245,245,0.08); border-radius: 2px; overflow: hidden;
}
.skill-bar span {
  display: block; height: 100%; background: var(--accent);
  transform-origin: left; transform: scaleX(0);
  transition: transform 1.2s var(--ease-out-expo);
}
.skill-list.revealed .skill-bar span { transform: scaleX(1); }
.skill-pct { font-size: 0.75rem; color: var(--muted); font-variant-numeric: tabular-nums; text-align: right; }
.skill-note {
  font-size: 0.8rem; line-height: 1.65; color: var(--muted);
  padding-top: 0.75rem; border-top: 1px solid var(--line);
}
.about-meta {
  margin: 1.4rem 0 0; font-size: 0.9rem; line-height: 1.7; color: var(--muted);
}

/* 工具链卡片（与 AI 工作流页 wf-card 同一格式） */
.tool-grid { display: grid; gap: 1rem; margin: 1.25rem 0 0; }
@media (min-width: 768px) { .tool-grid { grid-template-columns: repeat(2, 1fr); } }
.tool-card {
  padding: 1.35rem; border-radius: 0.6rem;
  background: var(--surface-2); border: 1px solid var(--line);
}
.tool-card h4 { margin: 0 0 0.5rem; font-size: 0.95rem; font-weight: 800; }
.tool-card p { margin: 0; font-size: 0.85rem; line-height: 1.7; color: var(--text-dim); }
.tool-card .tool-tag {
  display: block; margin-top: 0.5rem;
  font-size: 0.72rem; color: var(--accent); letter-spacing: 0.04em;
}
@media (min-width: 768px) {
  .tool-card:last-child:nth-child(odd) { grid-column: 1 / -1; }
}

/* ===== Contact / Footer ===== */
.contact {
  padding: 6rem 0 3rem;
  background: var(--bg);
  border-top: 1px solid var(--line);
}
.contact-inner { max-width: 1200px; margin: 0 auto; padding: 0 clamp(1rem, 4vw, 3rem); }
.contact-heading { margin-bottom: 2.5rem; }
.contact-desc { color: var(--muted); margin: 0.5rem 0 0; }

.contact-grid {
  display: grid; gap: 0.9rem; margin-bottom: 2rem;
}
@media (min-width: 768px) {
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1100px) {
  .contact-grid { grid-template-columns: repeat(4, 1fr); }
}
.contact-card {
  display: flex; flex-direction: column; gap: 0.3rem;
  padding: 1.1rem;
  background: var(--surface); border: 1px solid var(--line); border-radius: 0.75rem;
  transition: border-color 0.3s, transform 0.3s;
}
.contact-card:hover { border-color: rgba(198,242,78,0.4); transform: translateY(-3px); }
.contact-label { font-size: 0.6rem; letter-spacing: 0.15em; color: var(--muted); }
.contact-value { font-size: 0.9rem; font-weight: 600; color: var(--text); word-break: break-word; }

.contact-actions {
  display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 3rem;
}
.btn-primary, .btn-ghost {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.85rem 1.4rem; border-radius: 999px;
  font-size: 0.8rem; font-weight: 700;
  transition: transform 0.3s, background 0.3s, border-color 0.3s;
}
.btn-primary { background: var(--accent); color: var(--bg); }
.btn-primary:hover { transform: translateY(-2px); background: #d4ff6a; }
.btn-ghost { border: 1px solid var(--line); color: var(--text-dim); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

.copyright { font-size: 0.75rem; color: var(--muted); letter-spacing: 0.04em; }

/* ===== Reveal utilities ===== */
.reveal { opacity: 0; transform: translateY(2.5rem); transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo); }
.reveal.revealed { opacity: 1; transform: translateY(0); }

/* ===== Keyframes ===== */
@keyframes logoIn {
  from { opacity: 0; transform: translateY(-1.5rem); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes navIn {
  from { opacity: 0; transform: translateY(-1rem); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes videoIn {
  from { opacity: 0; transform: scale(1.12); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes textUp {
  from { opacity: 0; transform: translateY(1.5rem); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes lineUp {
  from { opacity: 0; transform: translateY(110%); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes scrollLine {
  0% { transform: translateY(-100%); }
  50% { transform: translateY(150%); }
  100% { transform: translateY(150%); }
}
@keyframes cardUp {
  from { opacity: 0; transform: translateY(3rem); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes revealUp {
  from { opacity: 0; transform: translateY(2rem); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Project Drawer ===== */
.project-drawer {
  position: fixed; inset: 0; z-index: 200;
  display: grid; place-items: end flex-end;
  pointer-events: none;
}
.project-drawer[aria-hidden="true"] { visibility: hidden; }
.project-drawer[aria-hidden="false"] { visibility: visible; pointer-events: auto; }

.drawer-backdrop {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.72);
  opacity: 0; transition: opacity 0.45s var(--ease-out-expo);
}
.project-drawer[aria-hidden="false"] .drawer-backdrop { opacity: 1; }

.drawer-panel {
  position: relative;
  width: min(720px, 100vw);
  height: 100vh;  /* 旧浏览器兜底 */
  height: 100dvh; /* 动态视口，规避 iOS 地址栏塌陷 */
  background: var(--bg);
  border-left: 1px solid var(--line);
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.5s var(--ease-out-expo);
}
.project-drawer[aria-hidden="false"] .drawer-panel { transform: translateX(0); }

.drawer-close {
  position: fixed; top: 1.25rem; right: min(720px, 100vw); margin-right: 1rem;
  z-index: 10;
  padding: 0.5rem 1rem;
  border: 1px solid var(--line); border-radius: 999px;
  background: rgba(10,10,10,0.7); backdrop-filter: blur(10px);
  color: var(--text); font-size: 0.75rem; font-weight: 600; letter-spacing: 0.08em;
  opacity: 0; transform: translateX(1rem);
  transition: opacity 0.4s 0.15s, transform 0.4s 0.15s, border-color 0.3s, color 0.3s;
}
.drawer-close:hover { border-color: var(--accent); color: var(--accent); }
.project-drawer[aria-hidden="false"] .drawer-close { opacity: 1; transform: translateX(0); }

.drawer-content { display: none; padding: 0; }
.drawer-content.active { display: block; }

.drawer-header {
  position: sticky; top: 0; z-index: 5;
  padding: 2rem clamp(1.25rem, 4vw, 2.5rem) 1.5rem;
  background: rgba(10,10,10,0.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.drawer-cat {
  display: inline-block; margin-bottom: 0.75rem;
  font-size: 0.65rem; font-weight: 700; letter-spacing: 0.12em; color: var(--accent); text-transform: uppercase;
}
.drawer-header h3 {
  margin: 0 0 0.4rem; font-size: clamp(1.4rem, 4vw, 2rem); font-weight: 800; letter-spacing: -0.02em;
}
.drawer-year { margin: 0; font-size: 0.8rem; color: var(--muted); }

.drawer-body {
  padding: 1.5rem clamp(1.25rem, 4vw, 2.5rem) 4rem;
}
.drawer-text h4 {
  margin: 1.6rem 0 0.5rem;
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.12em; color: var(--accent); text-transform: uppercase;
}
.drawer-text h4:first-child { margin-top: 0; }
.drawer-text p {
  margin: 0 0 0.75rem; font-size: 0.92rem; line-height: 1.7; color: var(--text-dim);
}
.drawer-cta { margin-top: 2rem; }

/* ===== Resume drawer layout ===== */
.drawer-text.resume { color: var(--text); }
.resume-header {
  display: flex; justify-content: space-between; align-items: flex-start; gap: 1.5rem;
  margin-bottom: 2rem;
}
.resume-name-block { flex: 1; }
.resume-name { margin: 0; font-size: clamp(2rem, 5vw, 3rem); font-weight: 800; letter-spacing: -0.03em; color: var(--text); line-height: 1; }
.resume-name-en { margin: 0.35rem 0 0.9rem; font-size: 0.75rem; letter-spacing: 0.2em; color: var(--muted); text-transform: uppercase; }
.resume-tag {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  background: var(--accent);
  color: var(--bg);
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.resume-avatar {
  width: 6.5rem; height: 8.125rem; object-fit: cover; object-position: center;
  border-radius: 4px; flex-shrink: 0;
  border: 1px solid var(--line); background: var(--surface);
}
.resume-summary { margin: 1.2rem 0; font-size: 0.88rem; line-height: 1.75; color: var(--text-dim); }
.resume-contact {
  display: flex; flex-wrap: wrap; gap: 0.6rem 1.25rem;
  list-style: none; padding: 0; margin: 0 0 2.5rem;
  font-size: 0.72rem; color: var(--text-dim);
}
.resume-contact strong { color: var(--accent); margin-right: 0.35rem; font-weight: 700; letter-spacing: 0.05em; }

.resume-grid { display: grid; grid-template-columns: 0.95fr 1.35fr; gap: 2rem; }

.drawer-text .resume-section h4 {
  display: flex; align-items: baseline; gap: 0.5rem;
  margin: 0 0 0.9rem; padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.78rem; font-weight: 800; letter-spacing: 0.04em;
  color: var(--text); text-transform: none;
}
.drawer-text .resume-section h4::before {
  content: "■"; color: var(--accent); font-size: 0.6rem;
}
.drawer-text .resume-section h4 span {
  font-size: 0.62rem; font-weight: 600; letter-spacing: 0.08em; color: var(--muted); text-transform: uppercase;
}
.drawer-text .resume-section:first-child h4 { margin-top: 0; }

.resume-entry { margin-bottom: 1.1rem; }
.resume-entry:last-child { margin-bottom: 0; }
.resume-entry h5 { margin: 0 0 0.15rem; font-size: 0.95rem; font-weight: 700; color: var(--text); line-height: 1.35; }
.resume-entry h6 { margin: 0 0 0.3rem; font-size: 0.8rem; font-weight: 700; color: var(--text); }
.resume-entry p { margin: 0 0 0.45rem; font-size: 0.82rem; line-height: 1.65; color: var(--text-dim); }
.resume-entry p:last-child { margin-bottom: 0; }
.resume-subtitle { margin: 0 0 0.35rem; font-size: 0.65rem; letter-spacing: 0.05em; color: var(--muted); text-transform: uppercase; }
.resume-date { font-size: 0.72rem; color: var(--muted); }
.resume-meta { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; margin-bottom: 0.4rem; }
.resume-meta h5 { margin: 0; }
.resume-meta > span { flex-shrink: 0; font-size: 0.72rem; color: var(--muted); white-space: nowrap; }
.resume-workflow-line { color: var(--text); font-weight: 600; }

.drawer-text.resume .drawer-cta { margin-top: 2.5rem; }

@media (max-width: 900px) {
  .resume-grid { grid-template-columns: 1fr; gap: 1.5rem; }
}
@media (max-width: 767px) {
  .resume-header { gap: 1rem; }
  .resume-avatar { width: 4.75rem; height: 5.95rem; }
  .resume-contact { gap: 0.5rem 1rem; margin-bottom: 2rem; }
  .resume-meta { flex-direction: column; align-items: flex-start; gap: 0.2rem; }
  .resume-meta > span { white-space: normal; }
}

.drawer-gallery {
  display: grid; gap: 1rem;
  margin-top: 2.5rem;
}
.drawer-gallery img {
  width: 100%; border-radius: 0.6rem; border: 1px solid var(--line);
  background: var(--surface);
}
/* 图注：抽屉内每张图配一行说明，样式克制，延续短横线视觉语言 */
.drawer-gallery figure, .drawer-videos figure {
  margin: 0; display: grid; gap: 0.55rem;
}
.drawer-videos figure { cursor: pointer; }
.drawer-gallery figcaption, .drawer-videos figcaption {
  order: -1;                 /* 图注置于图片上方 */
  display: flex; align-items: baseline; gap: 0.55rem;
  font-size: 0.72rem; line-height: 1.55; color: var(--muted);
  letter-spacing: 0.01em;
}
.drawer-gallery figcaption::before, .drawer-videos figcaption::before {
  content: ""; flex: none; width: 14px; height: 1px;
  background: var(--accent); transform: translateY(-0.22em);
}
.drawer-videos {
  display: grid; gap: 1rem; margin-top: 1rem;
}
.drawer-video {
  position: absolute; inset: 0; width: 100%; height: 100%;
  border-radius: 0.6rem; background: #000; display: block; object-fit: cover;
}

@media (min-width: 768px) {
  .drawer-panel { width: 720px; }
  .drawer-close { right: 720px; }
}
@media (max-width: 767px) {
  .drawer-panel { width: 100vw; border-left: none; }
  .drawer-close { top: 0.75rem; right: 0.75rem; margin-right: 0; }
  .drawer-header { padding-top: 3.2rem; }
}

/* ===== About 双定位 ===== */
.about-tracks {
  display: grid; gap: 0.75rem; margin-top: 1.25rem;
}
.track {
  display: grid; gap: 0.2rem;
  padding: 0.9rem 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent);
  border-radius: 0.4rem;
}
.track-key {
  font-size: 0.82rem; font-weight: 800; letter-spacing: 0.02em;
}
.track-key::before { content: "› "; color: var(--accent); }
.track-desc {
  font-size: 0.8rem; line-height: 1.6; color: var(--text-dim);
}
@media (min-width: 768px) {
  .about-tracks { grid-template-columns: 1fr 1fr; }
}

/* ===== 技能分级标签 ===== */
.skill-list li {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 0.55rem 0; border-bottom: 1px solid var(--line);
}
.skill-name { font-size: 0.85rem; color: var(--text-dim); }
.skill-level {
  flex: none;
  font-size: 0.68rem; font-weight: 700; letter-spacing: 0.06em;
  padding: 0.22rem 0.6rem; border-radius: 999px;
  border: 1px solid var(--line); color: var(--text-dim);
}
.skill-level.lvl-expert { color: var(--bg); background: var(--accent); border-color: var(--accent); }
.skill-level.lvl-pro { color: var(--accent); border-color: rgba(198,242,78,0.45); }
.skill-level.lvl-mid { color: var(--text-dim); }

/* ===== 成长轨迹（项目时间轴） ===== */
.timeline-ov { padding: 6rem clamp(1.25rem, 4vw, 3rem); max-width: 1400px; margin: 0 auto; }
.tl-ov {
  list-style: none; margin: 2.5rem 0 0; padding: 0;
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}
.tl-ov li {
  position: relative; padding: 1.1rem 1rem 1.1rem 1.1rem;
  border-left: 2px solid var(--line); background: var(--surface);
  border-radius: 0 0.5rem 0.5rem 0;
  display: grid; gap: 0.35rem;
}
.tl-ov li::before {
  content: ""; position: absolute; left: -6px; top: 1.35rem;
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent);
}
.tl-ov-date { font-size: 0.72rem; font-weight: 700; color: var(--accent); letter-spacing: 0.06em; }
.tl-ov-title { font-size: 0.85rem; font-weight: 700; line-height: 1.45; }
.tl-ov-cat { font-size: 0.7rem; color: var(--muted); }

/* 三栏布局：项目 / 实践 / 实习 */
.tl-cols {
  display: grid; gap: 1.5rem;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 2.5rem;
}
.tl-col { min-width: 0; }
.tl-col-title {
  margin: 0 0 1rem; padding-bottom: 0.6rem;
  font-size: 0.95rem; font-weight: 800; letter-spacing: -0.01em;
  border-bottom: 1px solid var(--line);
}
.tl-col .tl-ov {
  grid-template-columns: 1fr;  /* 每栏内纵向排列，避免自动折行 */
  margin-top: 0; gap: 0.7rem;
}
@media (max-width: 767px) {
  .tl-cols { grid-template-columns: 1fr; gap: 2rem; }
}

/* ===== 抽屉视频：封面 + 点击播放 ===== */
.video-frame {
  position: relative; width: 100%; aspect-ratio: 16 / 9;
  border-radius: 0.6rem; overflow: hidden; cursor: pointer;
  border: 1px solid var(--line); background: #000;
}
.video-frame.is-playing { cursor: default; }
.video-poster {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.6s var(--ease-smooth), opacity 0.4s;
}
.video-frame:hover .video-poster { transform: scale(1.03); }
.video-frame.is-playing .video-poster { opacity: 0; pointer-events: none; }
.video-play {
  position: absolute; inset: 0; display: grid; place-items: center;
  z-index: 2; font-size: 0.8rem; font-weight: 700; letter-spacing: 0.1em;
  color: var(--text); background: rgba(10,10,10,0.32);
  transition: opacity 0.3s, background 0.3s;
}
.video-frame.is-playing .video-play { opacity: 0; pointer-events: none; }
.video-frame:hover .video-play { background: rgba(10,10,10,0.15); color: var(--accent); }
.video-frame .drawer-video { width: 100%; height: 100%; object-fit: cover; border: none; border-radius: 0; }

/* ===== 微信二维码卡片 ===== */
.contact-card-qr { align-items: flex-start; }
.qr-img {
  width: 120px; height: 120px; object-fit: contain; margin-top: 0.35rem;
  border-radius: 0.4rem; background: #fff; padding: 6px;
}
.qr-placeholder {
  margin-top: 0.5rem; font-size: 0.72rem; color: var(--muted);
  border: 1px dashed var(--line); border-radius: 0.4rem;
  padding: 1.5rem 0.75rem; text-align: center; width: 120px;
}

/* ===== 焦点可见性 ===== */
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px;
}
.drawer-close:focus-visible { outline-offset: 4px; }

/* ===== 新增区块响应式 ===== */
@media (max-width: 767px) {
  .timeline-ov { padding: 4rem 1.25rem; }
  .qr-img, .qr-placeholder { width: 100%; max-width: 160px; height: auto; }
}

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important; animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== 求职作品集：信息层级与交互可用性 ===== */
html { color-scheme: dark; }
body {
  text-rendering: optimizeLegibility;
  -webkit-tap-highlight-color: rgba(198,242,78,0.22);
}
button { touch-action: manipulation; }
section[id], footer[id] { scroll-margin-top: 6rem; }

.main-nav a:nth-child(4) { animation-delay: 0.65s; }
.main-nav a:nth-child(5) { animation-delay: 0.75s; }

.section-kicker {
  margin: 0 0 0.7rem; font-size: 0.64rem; font-weight: 800;
  letter-spacing: 0.16em; color: var(--accent);
}
.section-sub { max-width: 64ch; line-height: 1.65; }
.work-card:focus-within {
  border-color: rgba(198,242,78,0.7);
  box-shadow: 0 0 0 3px rgba(198,242,78,0.14);
}
.card-info h3 { text-wrap: balance; }

.about-content { max-width: 68ch; }
.about-bio p { font-size: 0.94rem; line-height: 1.9; }
.tool-card { transition: transform 0.3s var(--ease-out-expo), border-color 0.3s; }
.tool-card:hover { transform: translateY(-3px); border-color: rgba(198,242,78,0.36); }

.timeline-ov > .section-header { padding-left: 0; padding-right: 0; }
.tl-col-title { color: var(--text); }
.drawer-panel { overscroll-behavior: contain; }
.drawer-text p { margin-bottom: 0.9rem; font-size: 0.94rem; line-height: 1.78; }
.contact-card:focus-visible { border-color: var(--accent); }

@media (hover: none), (pointer: coarse) {
  .tool-card:hover { transform: none; }
}

@media (hover: none), (pointer: coarse) {
  .card-media::after { opacity: 1; transform: none; }
}