/* ============================================================
   Swiss Minimal — 瑞士极简风样式
   原则：黑白两色、严格网格、大量留白、无装饰、无圆角、无阴影
   ============================================================ */

/* ---------- 变量 ---------- */
:root {
  --ink: #000000;        /* 主文字 / 主线条 */
  --paper: #ffffff;      /* 背景 */
  --gray: #8a8a8a;       /* 次要文字（唯一允许的中间色） */
  --line: #000000;       /* 分隔线 */
  --font-sans: "Helvetica Neue", Helvetica, Arial, "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --header-h: 64px;      /* 顶部栏高度 */
}

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

html { scroll-behavior: smooth; }

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

img, video { display: block; max-width: 100%; }

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

ul { list-style: none; }

::selection { background: var(--ink); color: var(--paper); }

/* 锚点滚动时避开固定头部 */
section[id] { scroll-margin-top: var(--header-h); }

/* ---------- 布局容器：瑞士风格以严格的垂直对齐为骨架 ---------- */
.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================================
   装饰元素：印刷对位标记（crosshair）、贴纸（sticker）
   ============================================================ */
.crosshair {
  position: absolute;
  width: 18px;
  height: 18px;
  pointer-events: none;
  z-index: 1;
}

.crosshair::before,
.crosshair::after {
  content: "";
  position: absolute;
  background: var(--ink);
}

.crosshair::before { top: 50%; left: 0; right: 0; height: 1px; }
.crosshair::after  { left: 50%; top: 0; bottom: 0; width: 1px; }

.crosshair--tl { top: 24px; left: 24px; }
.crosshair--br { bottom: 24px; right: 24px; }

.sticker {
  position: absolute;
  top: calc(var(--header-h) + 28px);
  right: 24px;
  border: 1px solid var(--ink);
  padding: 6px 14px;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  background: var(--paper);
  z-index: 1;
}

/* ============================================================
   HEADER — 极简固定顶栏：左名字，右导航
   ============================================================ */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  background: var(--paper);
  border-bottom: 1px solid var(--ink);
  z-index: 100;
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-name {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.site-nav {
  display: flex;
  gap: 28px;
}

.site-nav a {
  position: relative;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 0;
  color: var(--gray);
  transition: color 0.15s ease;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--ink);
}

.site-nav a:hover::after,
.site-nav a.active::after {
  transform: scaleX(1);
}

/* ============================================================
   HERO — 超大标题是瑞士风格的标志
   ============================================================ */
.hero {
  position: relative;
  padding: calc(var(--header-h) + 96px) 0 96px;
  border-bottom: 1px solid var(--ink);
}

.hero-kicker {
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 40px;
}

.hero-title {
  font-size: clamp(56px, 12vw, 152px);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  margin-bottom: 48px;
}

/* 句号用描边空心，与实心标题形成对比（不支持描边的浏览器回退为实心） */
.hero-dot { color: var(--ink); }
@supports (-webkit-text-stroke: 1px black) {
  .hero-dot { color: transparent; -webkit-text-stroke: 2px var(--ink); }
}

.hero-tagline {
  max-width: 560px;
  font-size: 18px;
  margin-bottom: 56px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray);
}

.hero-meta a { color: var(--ink); border-bottom: 1px solid var(--ink); }

.hero-meta-sep { color: var(--ink); }

/* ============================================================
   MARQUEE — 装饰性跑马灯字幕
   ============================================================ */
.marquee {
  overflow: hidden;
  border-bottom: 1px solid var(--ink);
  background: var(--paper);
}

.marquee-track {
  display: inline-flex;
  white-space: nowrap;
  will-change: transform;
  animation: marquee 30s linear infinite;
}

.marquee-seg {
  padding: 12px 0;
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--gray);
}

@keyframes marquee {
  to { transform: translateX(-50%); }
}

/* ============================================================
   SECTION — 统一板块节奏：标签行 + 内容
   ============================================================ */
.section {
  position: relative;
  padding: 96px 0;
  border-bottom: 1px solid var(--ink);
}

.section-label {
  display: flex;
  align-items: baseline;
  gap: 16px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  margin-bottom: 64px;
}

.section-num { color: var(--gray); font-weight: 400; letter-spacing: 0.1em; }

.section-intro {
  max-width: 520px;
  font-size: 14px;
  color: var(--gray);
  margin: -40px 0 48px;
}

.section-intro code {
  font-size: 12px;
  background: #f1f1f1;
  padding: 2px 6px;
}

/* ============================================================
   ABOUT — 左文右事实表，两栏网格
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 64px;
  align-items: start;
}

.about-text p { font-size: 17px; margin-bottom: 24px; }

.about-facts {
  border-top: 1px solid var(--ink);
  font-size: 14px;
}

.fact-row {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 12px 0;
  border-bottom: 1px solid var(--ink);
}

.fact-row dt { color: var(--gray); letter-spacing: 0.06em; }

.fact-row dd { text-align: right; }

.fact-row a { border-bottom: 1px solid var(--ink); transition: background 0.15s; }

.fact-row a:hover { background: var(--ink); color: var(--paper); }

/* ============================================================
   CAPABILITIES — 卡片网格
   卡片：编号 / 标题 / 描述 / 标签；悬停整卡反白 + 右上箭头出现
   ============================================================ */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--ink);
}

.card {
  position: relative;
  padding: 36px 32px 32px;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  transition: background 0.15s ease, color 0.15s ease;
}

.card:hover { background: var(--ink); color: var(--paper); }

.card-index {
  display: block;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gray);
  margin-bottom: 64px;
}

.card h3 { font-size: 20px; margin-bottom: 12px; }

.card p {
  font-size: 14px;
  color: var(--gray);
  margin-bottom: 28px;
}

.card-arrow {
  position: absolute;
  top: 32px;
  right: 32px;
  font-size: 18px;
  opacity: 0;
  transform: translate(-4px, 4px);
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.card:hover .card-arrow {
  opacity: 1;
  transform: none;
}

/* 标签 chips */
.tags { display: flex; flex-wrap: wrap; gap: 8px; }

.tags li {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid currentColor;
  padding: 4px 10px;
}

/* ============================================================
   EXPERIENCE — 时间线（左侧竖线 + 方形节点）
   ============================================================ */
.timeline {
  border-left: 1px solid var(--ink);
  padding-left: 32px;
  margin-left: 8px;
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 40px;
  padding: 28px 0;
  border-bottom: 1px solid var(--ink);
}

.timeline-item:last-child { border-bottom: none; }

/* 方形节点标记 */
.timeline-item::before {
  content: "";
  position: absolute;
  left: -37px;
  top: 36px;
  width: 9px;
  height: 9px;
  background: var(--paper);
  border: 1px solid var(--ink);
}

.timeline-year {
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray);
  padding-top: 4px;
}

.timeline-body h3 { font-size: 18px; margin-bottom: 8px; }

.timeline-co { font-weight: 400; color: var(--gray); }

.timeline-body p {
  font-size: 14px;
  color: var(--gray);
  max-width: 560px;
}

/* ============================================================
   PROJECTS — 列表行：悬停整行反白 + 箭头出现
   ============================================================ */
.project-row {
  display: grid;
  grid-template-columns: 56px 1fr auto auto 28px;
  gap: 24px;
  align-items: center;
  padding: 28px 16px;
  border-top: 1px solid var(--ink);
  font-size: 15px;
  transition: background 0.15s ease, color 0.15s ease;
}

.project-row:last-of-type { border-bottom: 1px solid var(--ink); }

.project-row:hover { background: var(--ink); color: var(--paper); }

.project-index { color: var(--gray); font-size: 13px; }

.project-title { font-size: 20px; font-weight: 600; }

.project-cat {
  color: var(--gray);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.project-year { font-size: 13px; }

.project-arrow {
  font-size: 16px;
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.project-row:hover .project-arrow {
  opacity: 1;
  transform: none;
}

/* ============================================================
   GALLERY — 精选推荐卡片 + 全幅横幅
   参考图：圆角竖版卡片、底部长条caption、一张大卡跨行、居中See more
   ============================================================ */

/* 全幅横幅图片（全宽，出容器） */
.banner {
  margin: 0 0 72px;
  width: 100%;
  overflow: hidden;
}

.banner img {
  width: 100%;
  height: clamp(220px, 38vw, 440px);
  object-fit: cover;
  display: block;
}

/* 标题：居中 + 下划线 */
.reco-title {
  text-align: center;
  font-size: clamp(28px, 4.5vw, 44px);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 56px;
}

.reco-title::after {
  content: "";
  display: block;
  width: 64px;
  height: 3px;
  background: var(--ink);
  margin: 20px auto 0;
}

/* 推荐卡片网格：4 列，大卡跨两行 */
.reco-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: 1fr;
  gap: 24px;
}

.reco-card {
  position: relative;
  display: block;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--ink);
  background: var(--paper);
}

.reco-card img {
  width: 100%;
  height: 100%;
  min-height: 320px;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}

.reco-card:hover img { transform: scale(1.04); }

/* 大卡：右侧跨两行 */
.reco-card--featured {
  grid-column: 3;
  grid-row: 1 / span 2;
}

.reco-card--featured img { min-height: 100%; }

/* 底部长条 caption：白色半透明横条 */
.reco-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.92);
  border-top: 1px solid var(--ink);
  padding: 12px 18px;
  backdrop-filter: blur(2px);
}

.reco-name {
  display: block;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.3;
}

.reco-sub {
  display: block;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--gray);
  margin-top: 2px;
}

/* 收藏心形按钮 */
.reco-like {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--ink);
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink);
  font-size: 17px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.12s ease, background 0.15s, color 0.15s;
}

.reco-like:hover { transform: scale(1.1); }

.reco-like.liked { background: var(--ink); color: var(--paper); }

/* 居中 See more 按钮 */
.see-more-wrap { text-align: center; margin-top: 56px; }

.see-more {
  display: inline-block;
  padding: 14px 56px;
  border: 1px solid var(--ink);
  border-radius: 14px;
  font-size: 15px;
  letter-spacing: 0.06em;
  transition: background 0.15s, color 0.15s;
}

.see-more:hover { background: var(--ink); color: var(--paper); }

/* ============================================================
   VIDEO — B 站视频内嵌
   ============================================================ */
.section--video { border-bottom: 1px solid var(--ink); }

/* 16:9 响应式播放器容器 */
.video-embed {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--ink);
  background: #000;
  overflow: hidden;
}

.video-embed iframe,
.video-embed video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
  object-fit: contain; /* 保证视频不被裁切，完整显示 */
  background: #000;
}

.video-note {
  margin-top: 20px;
  font-size: 14px;
  color: var(--gray);
  max-width: 520px;
}

.video-note code {
  font-size: 12px;
  background: #f1f1f1;
  padding: 2px 6px;
}

/* ============================================================
   STATS — 数据带（装饰性大数字）
   ============================================================ */
.section--stats { border-bottom: 1px solid var(--ink); }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 48px 32px;
  border-left: 1px solid var(--ink);
  transition: background 0.15s ease, color 0.15s ease;
}

.stat:first-child { border-left: none; }

.stat:hover { background: var(--ink); color: var(--paper); }

.stat-num {
  font-size: clamp(44px, 7vw, 84px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray);
  transition: color 0.15s;
}

/* ============================================================
   QUOTE — 引语（斜纹带 + 超大描边引号）
   ============================================================ */
.hatch {
  height: 10px;
  background: repeating-linear-gradient(
    -45deg,
    var(--ink) 0 2px,
    transparent 2px 6px
  );
  margin-bottom: 96px;
}

.quote-block { position: relative; padding: 16px 0 8px; }

.quote-mark {
  position: absolute;
  top: -56px;
  left: -12px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 220px;
  line-height: 1;
  color: var(--ink);
  user-select: none;
  pointer-events: none;
  z-index: 0;
}

@supports (-webkit-text-stroke: 1px black) {
  .quote-mark { color: transparent; -webkit-text-stroke: 1.5px var(--ink); }
}

.quote-block blockquote {
  position: relative;
  z-index: 1;
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  max-width: 720px;
}

.quote-cite {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray);
  font-style: normal;
}

.quote-cite::before {
  content: "";
  width: 32px;
  height: 1px;
  background: var(--ink);
}

/* ============================================================
   CONTACT — 大号邮箱是视觉主角
   ============================================================ */
.section--contact { border-bottom: none; }

.contact-big { margin-bottom: 24px; }

.contact-big a {
  font-size: clamp(28px, 6vw, 64px);
  font-weight: 700;
  letter-spacing: -0.02em;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 4px;
  transition: background 0.15s ease, color 0.15s ease;
}

.contact-big a:hover { background: var(--ink); color: var(--paper); }

.contact-note {
  font-size: 14px;
  color: var(--gray);
  margin-bottom: 48px;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
}

.contact-links a {
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
  transition: background 0.15s, color 0.15s;
}

.contact-links a:hover { background: var(--ink); color: var(--paper); }

/* ============================================================
   FOOTER — 超大描边字标 + 信息条
   ============================================================ */
.site-footer { border-top: 1px solid var(--ink); }

.footer-wordmark {
  width: 100%;
  text-align: center;
  font-size: clamp(48px, 12vw, 140px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--ink);
  padding: 48px 16px 32px;
  user-select: none;
  white-space: nowrap;
  overflow: hidden;
}

@supports (-webkit-text-stroke: 1px black) {
  .footer-wordmark { color: transparent; -webkit-text-stroke: 1.5px var(--ink); }
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 28px;
  padding-bottom: 28px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gray);
}

.footer-right { display: flex; gap: 24px; align-items: center; }

.back-top { color: var(--ink); border-bottom: 1px solid var(--ink); }

/* ============================================================
   滚动入场动画（克制：仅位移 + 淡入，无弹跳）
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.in { opacity: 1; transform: none; }

/* 尊重系统“减弱动态效果”设置 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .marquee-track { animation: none; }
}

/* ============================================================
   RESPONSIVE — 移动端收敛
   ============================================================ */
@media (max-width: 768px) {
  .site-nav { gap: 16px; }
  .site-nav a { font-size: 12px; }
  .sticker { display: none; }
  .hero { padding-top: calc(var(--header-h) + 56px); }
  .section { padding: 72px 0; }
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .cards-grid { grid-template-columns: 1fr; }
  .timeline-item { grid-template-columns: 1fr; gap: 8px; }
  .timeline-item::before { top: 8px; }
  .timeline-year { padding-top: 0; }
  .reco-grid { grid-template-columns: 1fr; }
  .reco-card--featured {
    grid-column: auto;
    grid-row: auto;
  }
  .reco-card img { min-height: 260px; }
  .banner { margin-bottom: 56px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat { padding: 32px 24px; }
  .stat:nth-child(3) { border-left: none; }
  .stat:nth-child(n + 3) { border-top: 1px solid var(--ink); }
  .hatch { margin-bottom: 72px; }
  .project-row {
    grid-template-columns: 40px 1fr auto 20px;
    gap: 16px;
    padding: 20px 8px;
  }
  .project-cat { display: none; }
}