/* ==========================================================================
   黄海东 · 作品集 — 首页
   依赖 base.css（设计令牌 / 通用组件）
   ========================================================================== */

:root {
  /* 堆叠卡片：左列上下两张图的高度（同时受宽度与视口高度约束） */
  --stack-h1: min(clamp(120px, 14vw, 200px), 17vh);
  --stack-h2: min(clamp(150px, 19vw, 300px), 25vh);
}

/* ══════════════════════════════════════════════════════════════════════
   01 · HERO
   ══════════════════════════════════════════════════════════════════════ */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh; /* 移动端避开地址栏高度跳变 */
  display: flex;
  flex-direction: column;
  overflow-x: clip;
  /* 工程坐标纸点阵 */
  background-image: radial-gradient(rgba(12, 12, 12, 0.075) 1px, transparent 1px);
  background-size: 26px 26px;
}

/* ── 导航 ── */
.hero-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem 1.5rem 0;
}

.hero-brand {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink);
}

.hero-brand-cursor {
  color: var(--led);
  animation: led-breathe 1.4s steps(1) infinite;
}

.hero-nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.hero-nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  /* 下划线用背景渐变绘制：不占位、不改变行高，滚动定位时平滑推移 */
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 1px;
  transition: background-size 0.35s var(--ease), color 0.25s var(--ease);
}

.hero-nav-link:hover,
.hero-nav-link.is-active { color: var(--ink); background-size: 100% 1px; }

@media (min-width: 640px) {
  .hero-nav { padding: 1.5rem 1.75rem 0; }
  .hero-nav-links { gap: 2rem; }
}

@media (min-width: 768px) {
  .hero-nav { padding: 2rem 2.5rem 0; }
  .hero-nav-links { gap: 2.5rem; }
  .hero-nav-link { font-size: 1rem; }
  .hero-brand { font-size: 1.125rem; }
}

@media (min-width: 1024px) {
  .hero-nav-link { font-size: 1.125rem; }
}

/* ── 巨型标题 ── */
.hero-head { margin-top: 2.5rem; }

.hero-kicker {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0 1.5rem;
  margin-bottom: 0.35rem;
  font-family: var(--font-mono);
  font-size: clamp(0.72rem, 1.2vw, 0.95rem);
  font-weight: 500;
  letter-spacing: 0.32em;
  text-transform: lowercase;
  color: var(--muted);
}

.hero-heading-wrap {
  overflow: hidden;
  padding-inline: 1.5rem;
}

.hero-heading {
  display: block;
  width: 100%;
  font-size: 14vw;
  white-space: nowrap;
}

@media (min-width: 640px) {
  .hero-head { margin-top: 1rem; }
  .hero-kicker { padding: 0 1.75rem; }
  .hero-heading-wrap { padding-inline: 1.75rem; }
  .hero-heading { font-size: 15vw; }
}

@media (min-width: 768px) {
  .hero-head { margin-top: 0.5rem; }
  .hero-kicker { padding: 0 2.5rem; }
  .hero-heading-wrap { padding-inline: 2.5rem; }
  .hero-heading { font-size: 16vw; }
}

@media (min-width: 1024px) {
  .hero-heading { font-size: 17.5vw; }
}

/* ── 规格表：以真实信息填充首屏，沿用工程标注语汇 ── */
.hero-specs {
  margin: 1.5rem 1.5rem 0;
  max-width: 30rem;
  border-top: 1px solid var(--line-mid);
}

.hero-spec {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
}

.hero-spec dt {
  flex: none;
  width: 4rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero-spec dd {
  color: var(--ink);
  letter-spacing: 0.02em;
}

@media (min-width: 768px) {
  .hero-specs { margin: 2.25rem 2.5rem 0; }
  .hero-spec { font-size: 0.78rem; padding: 0.65rem 0; }
  .hero-spec dt { width: 4.75rem; }
}

/* ── 底部横条 ── */
.hero-bottom {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1.25rem;
  padding: 0 1.5rem 1.75rem;
}

.hero-tagline {
  max-width: 160px;
  font-size: clamp(0.75rem, 1.4vw, 1.5rem);
  font-weight: 300;
  line-height: 1.375;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

@media (min-width: 640px) {
  .hero-bottom { padding: 0 1.75rem 2rem; }
  .hero-tagline { max-width: 220px; }
}

@media (min-width: 768px) {
  .hero-bottom { padding: 0 2.5rem 2.5rem; }
  .hero-tagline { max-width: 260px; }
}

/* ══════════════════════════════════════════════════════════════════════
   02 · MARQUEE — 随页面滚动横移的两行画廊
   ══════════════════════════════════════════════════════════════════════ */
.marquee {
  padding: 6rem 0 2.5rem;
  overflow: hidden;
}

.marquee-rows {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.marquee-row {
  display: flex;
  gap: 0.75rem;
  width: max-content;
  will-change: transform;
}

.marquee-item {
  position: relative;
  flex: none;
  width: 78vw;
  height: 50vw;
  border-radius: 1rem;
  overflow: hidden;
  background: var(--line-soft);
}

/* 图注 chip：左下角工程照片日志风格 */
.marquee-item::after {
  content: attr(data-label);
  position: absolute;
  left: 0.6rem;
  bottom: 0.6rem;
  max-width: calc(100% - 1.2rem);
  padding: 0.3rem 0.7rem;
  border-radius: 0.45rem;
  background: rgba(12, 12, 12, 0.72);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: #E8F4EC;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.marquee-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (min-width: 640px) {
  .marquee { padding-top: 8rem; }
  .marquee-item { width: 420px; height: 270px; }
}

@media (min-width: 768px) {
  .marquee { padding-top: 10rem; }
}

/* ══════════════════════════════════════════════════════════════════════
   03 · ABOUT
   ══════════════════════════════════════════════════════════════════════ */
.about {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100svh;
  padding: 5rem 1.25rem;
  overflow: clip;
}

/* 图纸标题栏角标：替代原 3D 贴纸，编码"这是一张工程图纸"的信息 */
.about-note {
  position: absolute;
  z-index: 0;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  opacity: 0.7;
  pointer-events: none;
  user-select: none;
}

.about-note--tl { top: 5%; left: 5%; }
.about-note--tr { top: 5%; right: 5%; }
.about-note--bl { bottom: 6%; left: 5%; }
.about-note--br { bottom: 6%; right: 5%; }

@media (min-width: 640px) {
  .about { padding: 5rem 2rem; }
  .about-note { font-size: 0.72rem; }
  .about-note--tl { top: 7%; left: 8%; }
  .about-note--tr { top: 7%; right: 8%; }
  .about-note--bl { bottom: 8%; left: 8%; }
  .about-note--br { bottom: 8%; right: 8%; }
}

@media (min-width: 768px) {
  .about { padding: 5rem 2.5rem; }
  .about-note { font-size: 0.8rem; }
  .about-note--tl { top: 8%; left: 10%; }
  .about-note--tr { top: 8%; right: 10%; }
  .about-note--bl { bottom: 10%; left: 10%; }
  .about-note--br { bottom: 10%; right: 10%; }
}

.about-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2.5rem;
  width: 100%;
  max-width: 62rem;
}

.about-heading {
  font-size: clamp(3rem, 12vw, 160px);
  text-align: center;
}

.about-text {
  max-width: 560px;
  font-size: clamp(1rem, 2vw, 1.35rem);
  font-weight: 500;
  line-height: 1.625;
  text-align: center;
  color: var(--ink);
  white-space: pre-wrap;
}

/* 逐字显现：默认压暗，滚动时按进度点亮 */
.anim-char { opacity: 0.2; }

.about-cta { margin-top: 4rem; }

@media (min-width: 640px) {
  .about-inner { gap: 3.5rem; }
  .about-cta { margin-top: 5rem; }
}

@media (min-width: 768px) {
  .about-inner { gap: 4rem; }
  .about-cta { margin-top: 6rem; }
}

/* ══════════════════════════════════════════════════════════════════════
   04 · SERVICES — 能力方向（纯白圆角分区）
   ══════════════════════════════════════════════════════════════════════ */
.services { padding: 5rem 1.25rem; }

.services-heading {
  font-size: clamp(3rem, 12vw, 160px);
  text-align: center;
  margin-bottom: 4rem;
}

.services-list {
  max-width: 64rem;
  margin: 0 auto;
}

.service-item {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 2rem 0;
  border-top: 1px solid var(--line-mid);
}

.service-item:last-child { border-bottom: 1px solid var(--line-mid); }

.service-num {
  flex: none;
  font-size: clamp(3rem, 10vw, 140px);
  font-weight: 900;
  line-height: 0.9;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.service-body { padding-top: 0.3rem; }

.service-name {
  font-size: clamp(1rem, 2.2vw, 2.1rem);
  font-weight: 500;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--ink);
}

.service-desc {
  margin-top: 0.5rem;
  max-width: 42rem;
  font-size: clamp(0.85rem, 1.6vw, 1.25rem);
  font-weight: 300;
  line-height: 1.625;
  opacity: 0.6;
}

/* 悬停微交互：编号点亮为 LED 绿，条目轻微右移 */
.service-item { transition: transform 0.35s var(--ease); }
.service-num { transition: color 0.35s var(--ease), -webkit-text-fill-color 0.35s var(--ease); }

.service-item:hover { transform: translateX(0.4rem); }
.service-item:hover .service-num { color: var(--led); -webkit-text-fill-color: var(--led); }

@media (min-width: 640px) {
  .services { padding: 6rem 2rem; }
  .services-heading { margin-bottom: 5rem; }
  .service-item { gap: 2rem; padding: 2.5rem 0; }
}

@media (min-width: 768px) {
  .services { padding: 8rem 2.5rem; }
  .services-heading { margin-bottom: 7rem; }
  .service-item { gap: 3rem; padding: 3rem 0; }
}

/* ══════════════════════════════════════════════════════════════════════
   05 · PROJECTS — 吸顶堆叠卡片（暗色分区）
   ══════════════════════════════════════════════════════════════════════ */
.projects { padding: 5rem 1.25rem 6rem; }

.projects-heading {
  font-size: clamp(3rem, 12vw, 160px);
  text-align: center;
  margin-bottom: 3rem;
}

.stack { display: block; }

/* 每张卡片一个 85vh 的舞台，卡片在其中吸顶堆叠 */
.stack-item { height: 85vh; height: 85svh; }

.stack-card {
  position: sticky;
  top: calc(6rem + var(--stack-i, 0) * 28px);
  transform-origin: top center;
  padding: 1rem;
  border: 2px solid var(--dark-fg);
  border-radius: var(--radius-card);
  background: var(--dark);
  will-change: transform;
}

.stack-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
  padding: 0.5rem 0.5rem 1.25rem;
}

.stack-num {
  font-size: clamp(2.5rem, 8vw, 110px);
  font-weight: 900;
  line-height: 0.9;
  font-variant-numeric: tabular-nums;
  background-image: var(--grad-on-dark);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.stack-meta {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 0;
}

.stack-cat {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--dark-muted);
}

.stack-name {
  font-size: clamp(1.1rem, 2.4vw, 2.1rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--dark-fg);
}

.stack-btn { margin-left: auto; }

.stack-media {
  display: grid;
  grid-template-columns: 40% 1fr;
  gap: 0.75rem;
}

.stack-col { display: grid; gap: 0.75rem; align-content: start; }

/* 右列不参与定高：唯一子元素绝对定位后，其固有宽高比
   就不会在高度未定时退化成 auto，反向把整行撑高 */
.stack-col--b { display: block; position: relative; }

.stack-media-item {
  display: block;
  width: 100%;
  border-radius: var(--radius-card);
  object-fit: cover;
  background: #16181B;
}

/* 媒体高度同时受视口高度约束，保证整张卡片始终矮于 85vh 舞台，吸顶堆叠才成立 */
.stack-col--a .stack-media-item:nth-child(1) { height: var(--stack-h1); }
.stack-col--a .stack-media-item:nth-child(2) { height: var(--stack-h2); }
.stack-col--a .stack-media-item:only-child { height: calc(var(--stack-h1) + var(--stack-h2) + 0.75rem); }
.stack-col--b .stack-media-item { position: absolute; inset: 0; height: 100%; }

@media (min-width: 640px) {
  .projects { padding: 6rem 2rem 7rem; }
  .projects-heading { margin-bottom: 4rem; }
  .stack-card { padding: 1.5rem; }
}

@media (min-width: 768px) {
  .projects { padding: 8rem 2.5rem 8rem; }
  .stack-card { top: calc(8rem + var(--stack-i, 0) * 28px); padding: 2rem; }
}

/* ══════════════════════════════════════════════════════════════════════
   06 · 白色分区通用（实习 / 荣誉）
   ══════════════════════════════════════════════════════════════════════ */
.panel { padding: 5rem 1.25rem 4rem; }

.panel-heading { font-size: clamp(2.5rem, 10vw, 140px); }

.panel-inner {
  max-width: 64rem;
  margin: 3rem auto 0;
}

@media (min-width: 640px) {
  .panel { padding: 6rem 2rem 5rem; }
  .panel-inner { margin-top: 4rem; }
}

@media (min-width: 768px) {
  .panel { padding: 8rem 2.5rem 6rem; }
}

/* ── 实习卡片 ── */
.exp-card {
  display: grid;
  gap: 1.5rem;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--bg);
}

/* 无配图条目：正文单栏铺满（避免右侧留空） */
.exp-card--plain { grid-template-columns: 1fr; }

/* 多条经历之间的间距 */
.exp-card + .exp-card { margin-top: 1.5rem; }

.exp-thumb {
  border-radius: 1.25rem;
  overflow: hidden;
}

.exp-thumb img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.exp-cat {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
}

.exp-name {
  margin-top: 0.5rem;
  font-size: clamp(1.15rem, 2.4vw, 2rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--ink);
}

.exp-role {
  margin-top: 0.4rem;
  font-size: clamp(0.82rem, 1.4vw, 1rem);
  font-weight: 400;
  color: var(--fg);
}

.exp-desc {
  margin-top: 0.9rem;
  max-width: 42rem;
  font-size: clamp(0.85rem, 1.5vw, 1.05rem);
  font-weight: 300;
  line-height: 1.7;
  color: var(--muted);
}

.exp-actions { margin-top: 1.5rem; }

@media (min-width: 768px) {
  .exp-card {
    grid-template-columns: 1.6fr 1fr;
    align-items: center;
    gap: 2.5rem;
    padding: 2rem;
  }

  .exp-thumb { order: 2; }
  .exp-body { order: 1; }
}

/* ── 荣誉列表 ── */
.award-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--line-mid);
}

.award-row:last-child { border-bottom: 1px solid var(--line-mid); }

.award-name {
  font-size: clamp(0.9rem, 1.5vw, 1.15rem);
  font-weight: 400;
  color: var(--ink);
}

.award-level {
  flex: none;
  padding: 0.25rem 0.85rem;
  border: 1px solid var(--line-mid);
  border-radius: 9999px;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--muted);
  white-space: nowrap;
}

.award-level.is-national { background: var(--ink); border-color: var(--ink); color: #FFFFFF; }
.award-level.is-regional { background: var(--soft); border-color: var(--soft); color: var(--ink); }

@media (max-width: 560px) {
  .award-row { flex-direction: column; align-items: flex-start; gap: 0.6rem; }
}

/* ── 实验页面卡片 ── */
.lab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1rem;
}

.lab-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 1.5rem;
  background: var(--bg);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.lab-card:hover {
  transform: translateY(-3px);
  border-color: var(--line-mid);
  background: #FBFBFA;
}

.lab-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.lab-name {
  font-size: clamp(1.05rem, 1.8vw, 1.35rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
}

.lab-desc {
  font-size: 0.85rem;
  font-weight: 300;
  line-height: 1.7;
  color: var(--muted);
}

/* ══════════════════════════════════════════════════════════════════════
   08 · CONTACT + FOOTER（暗色收尾）
   ══════════════════════════════════════════════════════════════════════ */
.contact {
  padding: 5rem 1.25rem 3.5rem;
  text-align: center;
}

.contact-heading { font-size: clamp(3rem, 12vw, 160px); }

.contact-eyebrow { margin-bottom: 1.25rem; }

.contact-lead {
  margin-top: 1.5rem;
  font-size: clamp(0.95rem, 1.6vw, 1.25rem);
  font-weight: 300;
  line-height: 1.7;
  color: var(--dark-muted);
}

.contact-actions {
  margin-top: 2.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

@media (min-width: 640px) {
  .contact { padding: 6rem 2rem 4rem; }
}

@media (min-width: 768px) {
  .contact { padding: 8rem 2.5rem 4.5rem; }
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem 1.25rem 2.5rem;
  border-top: 1px solid var(--dark-line);
  background: var(--dark);
  color: var(--dark-muted);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}

@media (min-width: 640px) {
  .site-footer { padding: 2rem 1.75rem 2.5rem; }
}

@media (min-width: 768px) {
  .site-footer { padding: 2rem 2.5rem 2.5rem; }
}

/* ══════════════════════════════════════════════════════════════════════
   手机端适配
   ══════════════════════════════════════════════════════════════════════ */
@media (max-width: 767px) {
  /* 首屏不再强制满屏：内容自然高度，跑马灯上探入屏，页面更显充实 */
  .hero { min-height: 0; }

  /* 刘海屏 / 手势条安全区 */
  .hero-nav {
    padding-left: max(1.5rem, env(safe-area-inset-left));
    padding-right: max(1.5rem, env(safe-area-inset-right));
  }

  .site-footer {
    padding-left: max(1.25rem, env(safe-area-inset-left));
    padding-right: max(1.25rem, env(safe-area-inset-right));
    padding-bottom: calc(2.5rem + env(safe-area-inset-bottom));
  }

  /* 触摸目标不小于 44px */
  .hero-nav-link { padding: 0.6rem 0; }
  .btn-contact,
  .btn-ghost { min-height: 44px; }

  /* 首屏：底部信息改为纵向堆叠并左对齐，填补图片移除后的空白 */
  .hero-bottom {
    margin-top: 2rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
    padding-bottom: calc(1.75rem + env(safe-area-inset-bottom));
  }

  .hero-tagline { max-width: 22ch; }

  /* 跑马灯：压缩上下留白 */
  .marquee { padding: 4.5rem 0 2rem; }

  /* 关于：角标内收，避免与正文抢空间 */
  .about { padding: 4rem 1.25rem; }
  .about-note--tl,
  .about-note--tr { top: 3%; }
  .about-note--bl,
  .about-note--br { bottom: 3.5%; }
  .about-cta { margin-top: 3rem; }

  /* 能力：收紧行距 */
  .services { padding: 4rem 1.25rem; }
  .services-heading { margin-bottom: 2.5rem; }
  .service-item { gap: 1rem; padding: 1.5rem 0; }

  /* 项目堆叠：缩小媒体高度、降低吸顶位移，保证卡片完整可见 */
  :root {
    --stack-h1: 96px;
    --stack-h2: 124px;
  }

  .projects { padding: 4rem 1.25rem 5rem; }
  .stack-item { height: 80svh; }
  .stack-card { top: calc(4.5rem + var(--stack-i, 0) * 16px); }
  .stack-btn { margin-left: 0; }
  .stack-media { grid-template-columns: 42% 1fr; }

  /* 其余分区留白 */
  .panel { padding: 4rem 1.25rem 3rem; }
  .contact { padding: 4rem 1.25rem 3rem; }
}

/* 窄屏（≤560px）进一步收敛 */
@media (max-width: 560px) {
  .hero-brand { font-size: 0.9rem; }
  .hero-nav-links { gap: 1rem; }
  .hero-nav-link { font-size: 0.78rem; letter-spacing: 0.06em; }

  /* 关于区四角标注只保留左上 / 右下，避免拥挤 */
  .about-note--tr,
  .about-note--bl { display: none; }

  .exp-card { padding: 1.25rem; border-radius: 28px; }
  .marquee-item::after { font-size: 0.55rem; }
}

/* ── 移动端降载：跑马灯图注 chip 的实时模糊会随位移动效逐帧重算 ────── */
@media (max-width: 720px) {
  .marquee-item::after {
    background: rgba(12, 12, 12, 0.86);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}