/* ==========================================================================
   王韵豪个人主页 · 学术清爽浅色风格
   无外部 CDN / 无 npm 依赖 / 纯 CSS
   ========================================================================== */

:root {
  /* 主题色板 */
  --color-bg: #ffffff;
  --color-bg-soft: #f8fafc;
  --color-primary: #1e3a8a;
  --color-accent: #0f766e;
  --color-highlight: #2563eb;
  --color-text: #0f172a;
  --color-secondary: #475569;
  --color-border: #e2e8f0;
  --color-primary-soft: rgba(30, 58, 138, 0.08);
  --color-accent-soft: rgba(15, 118, 110, 0.08);

  /* 字体 */
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto,
    'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --font-mono: 'JetBrains Mono', Consolas, 'Courier New', monospace;

  /* 布局 */
  --nav-height: 68px;
  --container-max: 1080px;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow-card: 0 2px 10px rgba(15, 23, 42, 0.05), 0 1px 3px rgba(15, 23, 42, 0.04);
  --shadow-hover: 0 10px 28px rgba(15, 23, 42, 0.10), 0 4px 10px rgba(15, 23, 42, 0.06);
}

/* ---------- Reset / 基础 ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  /* 抵消固定顶栏对锚点的遮挡 */
  scroll-padding-top: calc(var(--nav-height) + 12px);
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--color-highlight);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-primary);
}

ul {
  list-style: none;
}

.container {
  width: min(100% - 48px, var(--container-max));
  margin-inline: auto;
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 26px;
  border-radius: 999px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.4;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.2s ease, color 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
  white-space: nowrap;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--color-highlight);
  color: #ffffff;
  box-shadow: 0 6px 18px rgba(30, 58, 138, 0.25);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.85rem;
}

/* ---------- 顶栏 ---------- */
.navbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.86);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.brand-name {
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.nav-menu {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--color-secondary);
  font-size: 0.92rem;
  font-weight: 500;
}

.nav-link:hover {
  color: var(--color-primary);
  background: var(--color-primary-soft);
}

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

.nav-list .btn-sm {
  margin-left: 8px;
}

/* 汉堡按钮（默认隐藏） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
}

.hamburger-line {
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--color-text);
  transition: transform 0.25s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded='true'] .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded='true'] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded='true'] .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Section 通用 ---------- */
.section {
  padding: 96px 0;
  scroll-margin-top: var(--nav-height);
}

.section-alt {
  background: var(--color-bg-soft);
  border-block: 1px solid var(--color-border);
}

.section-head {
  margin-bottom: 44px;
}

.section-kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.section-title {
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.5px;
}

.section-subtitle {
  margin-top: 6px;
  font-size: 1rem;
  color: var(--color-secondary);
}

/* 相邻两个浅色区块共用一条边框，避免出现 2px 重线 */
.section-alt + .section-alt {
  border-top: none;
}

/* ---------- Hero ---------- */
.hero {
  padding: calc(var(--nav-height) + 64px) 0 80px;
  background:
    radial-gradient(1100px 420px at 85% -10%, var(--color-accent-soft), transparent 60%),
    radial-gradient(900px 380px at -10% 10%, var(--color-primary-soft), transparent 55%),
    var(--color-bg);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  align-items: center;
  gap: 48px;
}

.hero-greet {
  font-size: 1.05rem;
  color: var(--color-secondary);
  margin-bottom: 6px;
}

.hero-name {
  font-size: clamp(2.6rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: 2px;
  line-height: 1.15;
  color: var(--color-text);
  margin-bottom: 14px;
}

.hero-subtitle {
  font-size: 1.12rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.hero-tagline {
  font-size: 1rem;
  color: var(--color-secondary);
  margin-bottom: 26px;
}

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

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 26px;
}

.hero-quicklinks {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.hero-quicklinks a {
  color: var(--color-secondary);
  font-size: 0.92rem;
  border-bottom: 1px dashed var(--color-border);
  padding-bottom: 2px;
}

.hero-quicklinks a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.hero-figure {
  display: flex;
  justify-content: center;
}

.avatar-ring {
  position: relative;
  width: min(280px, 70vw);
  aspect-ratio: 3 / 4;
  border-radius: 28px;
  padding: 8px;
  background: linear-gradient(145deg, var(--color-primary), var(--color-accent));
  box-shadow: var(--shadow-hover);
}

.avatar {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 22px;
  border: 4px solid #ffffff;
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 40px;
  align-items: start;
}

.about-bio p {
  color: var(--color-secondary);
  font-size: 1.02rem;
  margin-bottom: 16px;
}

.about-bio strong {
  color: var(--color-text);
  font-weight: 600;
}

.info-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 24px 26px;
}

.info-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-primary-soft);
}

.info-list li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--color-border);
  font-size: 0.95rem;
}

.info-list li:last-child {
  border-bottom: none;
}

.info-label {
  color: var(--color-secondary);
  flex-shrink: 0;
}

.info-list a {
  color: var(--color-text);
}

.info-list a:hover {
  color: var(--color-highlight);
}

/* ---------- 时间线 ---------- */
.timeline {
  position: relative;
  padding-left: 30px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-accent));
  opacity: 0.35;
}

.timeline-item {
  position: relative;
  margin-bottom: 28px;
}

.timeline-dot {
  position: absolute;
  left: -27px;
  top: 26px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 4px solid var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-soft);
}

.timeline-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 24px 28px;
}

.timeline-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.timeline-org {
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--color-text);
}

.timeline-major {
  font-size: 0.95rem;
  color: var(--color-secondary);
  margin-top: 2px;
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  border-radius: 999px;
  padding: 4px 12px;
  white-space: nowrap;
}

.timeline-desc {
  color: var(--color-secondary);
  font-size: 0.96rem;
}

.timeline-desc li {
  padding-left: 18px;
  position: relative;
  margin-bottom: 4px;
}

.timeline-desc li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* ---------- 经历 ---------- */
.exp-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 28px 32px;
}

.exp-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.exp-role {
  font-size: 1.28rem;
  font-weight: 700;
  color: var(--color-text);
}

.exp-company {
  font-size: 0.96rem;
  color: var(--color-secondary);
  margin-top: 2px;
}

.exp-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  border-radius: 999px;
  padding: 4px 12px;
  white-space: nowrap;
}

.exp-project {
  margin: 6px 0 12px;
  font-size: 1rem;
  color: var(--color-text);
  font-weight: 600;
}

.tag-text {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: 999px;
  padding: 2px 10px;
  margin-left: 4px;
  vertical-align: middle;
}

.exp-points {
  color: var(--color-secondary);
  font-size: 0.97rem;
}

.exp-points li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
}

.exp-points li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-highlight);
}

.exp-result {
  margin-top: 12px;
  font-size: 0.97rem;
  color: var(--color-accent);
  font-weight: 600;
}

/* ---------- 项目卡片 ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  border: 1px solid rgba(15, 118, 110, 0.18);
  border-radius: 999px;
  padding: 2px 10px;
}

.project-title {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
  line-height: 1.45;
}

.project-meta {
  font-size: 0.9rem;
  color: var(--color-primary);
  font-weight: 600;
}

.project-period {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-secondary);
  margin: 4px 0;
}

.project-stack {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  border-radius: var(--radius-sm);
  padding: 5px 10px;
  display: inline-block;
  align-self: flex-start;
  margin-bottom: 14px;
}

.project-points {
  color: var(--color-secondary);
  font-size: 0.93rem;
  flex: 1;
}

.project-points li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 7px;
}

.project-points li::before {
  content: '';
  position: absolute;
  left: 3px;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-highlight);
}

.project-result {
  margin-top: 10px;
  font-size: 0.94rem;
  color: var(--color-accent);
  font-weight: 600;
}

/* 个人项目（弱化展示：同构卡片 + 虚线边框 + 浅灰底） */
.project-card-personal {
  background: var(--color-bg-soft);
  border-style: dashed;
}
.project-card-personal:hover {
  transform: none;
  box-shadow: var(--shadow-card);
}
.project-result a {
  color: var(--color-highlight);
  text-decoration: none;
}
.project-result a:hover {
  text-decoration: underline;
}

/* ---------- 成果 ---------- */
.research-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.research-item {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 18px 22px;
  flex-wrap: wrap;
}

.research-badge {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 999px;
  padding: 4px 14px;
  margin-top: 3px;
  white-space: nowrap;
}

.badge-paper {
  color: var(--color-highlight);
  background: rgba(37, 99, 235, 0.1);
}

.badge-patent {
  color: var(--color-primary);
  background: var(--color-primary-soft);
}

.badge-copyright {
  color: var(--color-accent);
  background: var(--color-accent-soft);
}

.badge-award {
  color: #b45309;
  background: rgba(180, 83, 9, 0.1);
}

.badge-writing {
  color: #7c3aed;
  background: rgba(124, 58, 237, 0.1);
}

.research-text {
  color: var(--color-text);
  font-size: 1rem;
  flex: 1;
  min-width: 240px;
}

/* ---------- 媒体报道 ---------- */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.news-card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.news-thumb {
  display: block;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--color-bg-soft);
}

.news-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

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

.news-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 22px 24px;
  flex: 1;
}

.news-source {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  border-radius: 999px;
  padding: 3px 10px;
}

.news-title {
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.5;
}

.news-title a {
  color: var(--color-text);
}

.news-title a:hover {
  color: var(--color-highlight);
}

.news-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-secondary);
}

.news-note {
  font-size: 0.93rem;
  color: var(--color-secondary);
  line-height: 1.7;
  flex: 1;
}

/* ---------- 技能标签云 ---------- */
.skills-cloud {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.skill-group {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 20px 24px;
}

.skill-group-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 14px;
  padding-left: 12px;
  border-left: 4px solid var(--color-accent);
  line-height: 1.3;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.skill-tag {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--color-secondary);
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 5px 14px;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.skill-tag:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

/* ---------- 联系方式 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 18px;
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  text-align: center;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 26px 18px;
  color: var(--color-text);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.contact-card:hover {
  color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-primary);
}

.contact-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: 1.3rem;
  margin-bottom: 6px;
}

.contact-label {
  font-size: 0.82rem;
  color: var(--color-secondary);
  letter-spacing: 1px;
}

.contact-value {
  font-size: 0.95rem;
  font-weight: 600;
  word-break: break-all;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--color-text);
  color: #cbd5e1;
  padding: 26px 0;
}

.footer-inner {
  text-align: center;
  font-size: 0.9rem;
}

/* ---------- 淡入动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 900px) {
  .projects-grid,
  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
  }

  .section {
    padding: 64px 0;
  }

  /* 移动端导航抽屉 */
  .nav-toggle {
    display: inline-flex;
  }

  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-hover);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    flex-direction: column;
    align-items: stretch;
  }

  .nav-menu.open {
    max-height: calc(100vh - var(--nav-height));
    overflow-y: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px 16px 18px;
  }

  .nav-link {
    display: block;
    padding: 12px 10px;
    font-size: 1rem;
  }

  .nav-list .btn-sm {
    margin: 10px 0 0;
    width: 100%;
  }

  /* Hero */
  .hero {
    padding: calc(var(--nav-height) + 40px) 0 56px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .hero-figure {
    order: -1;
  }

  .avatar-ring {
    width: min(220px, 64vw);
  }

  .section-title {
    font-size: 1.55rem;
  }

  /* 项目/媒体/技能改单列 */
  .projects-grid,
  .news-grid {
    grid-template-columns: 1fr;
  }

  .skills-cloud {
    grid-template-columns: 1fr;
  }

  .timeline-head,
  .exp-head {
    flex-direction: column;
    gap: 6px;
  }

  .timeline-card,
  .exp-card {
    padding: 20px;
  }

  .research-item {
    flex-direction: column;
    gap: 6px;
  }
}