/* ===== Design System: 三高共管项目 ===== */
:root {
  --primary: oklch(40% 0.18 25);
  --primary-light: oklch(72% 0.14 85);
  --primary-bg: oklch(40% 0.18 25 / 0.08);
  --primary-dark: oklch(30% 0.16 25);
  --bg: oklch(98.5% 0.003 25);
  --bg-card: oklch(100% 0 0);
  --border: oklch(90% 0.005 25);
  --border-light: oklch(93% 0.004 25);
  --text: oklch(25% 0.008 25);
  --text-secondary: oklch(48% 0.008 25);
  --text-muted: oklch(55% 0.005 25);
  --text-white: oklch(100% 0 0);
  --footer-bg: oklch(16% 0.01 25);
  --radius-sm: 0.375rem;
  --radius: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: var(--font-sans);
  font-size: 1rem; line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}

/* ===== Typography ===== */
h1, h2, h3, h4, .serif { font-family: var(--font-serif); font-weight: 700; line-height: 1.25; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem); }
h2 { font-size: clamp(1.75rem, 3vw + 0.5rem, 2.75rem); }
h3 { font-size: clamp(1.125rem, 1.5vw + 0.25rem, 1.5rem); }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { border: none; cursor: pointer; font-family: inherit; }

/* ===== Utilities ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 clamp(1rem, 4vw, 3rem); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* ===== Navigation ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: oklch(100% 0 0 / 0.92);
  backdrop-filter: blur(16px) saturate(1.8);
  -webkit-backdrop-filter: blur(16px) saturate(1.8);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.nav.scrolled { box-shadow: 0 1px 20px oklch(0% 0 0 / 0.06); }
.nav .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 4.5rem;
}
.nav-brand { display: flex; align-items: center; gap: 0.75rem; }
.nav-logo {
  width: 2.5rem; height: 2.5rem; border-radius: 0.5rem;
  background: var(--primary);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.nav-logo svg { width: 1.5rem; height: 1.5rem; fill: white; }
.nav-title { font-family: var(--font-serif); font-size: 0.95rem; font-weight: 600; color: var(--text); line-height: 1.3; }
.nav-title small { display: block; font-size: 0.7rem; font-weight: 400; color: var(--text-muted); letter-spacing: 0.05em; }
.nav-links { display: flex; gap: 0.25rem; list-style: none; }
.nav-links a {
  padding: 0.5rem 1rem; border-radius: 0.5rem;
  font-size: 0.9rem; font-weight: 500; color: oklch(40% 0.005 25);
  transition: all 0.2s ease;
}
.nav-links a:hover { background: var(--primary-bg); color: var(--primary); }
.nav-links a.active { color: var(--primary); font-size: 1.05rem; font-weight: 600; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 0.5rem; }
.nav-toggle span { display: block; width: 1.5rem; height: 2px; background: oklch(30% 0.005 25); margin: 0.3rem 0; transition: 0.3s; }

/* ===== Hero ===== */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  position: relative; overflow: hidden;
  padding-top: 4.5rem;
}
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 50%, oklch(85% 0.04 25 / 0.35), transparent 60%),
    radial-gradient(ellipse 50% 70% at 85% 30%, oklch(90% 0.02 25 / 0.25), transparent 55%),
    var(--bg);
}
.hero-accent {
  position: absolute; top: 15%; right: -5%;
  width: 40vw; height: 40vw; max-width: 600px; max-height: 600px;
  border: 1.5px solid oklch(75% 0.05 25 / 0.3);
  border-radius: 50%;
  animation: heroPulse 8s ease-in-out infinite;
}
.hero-accent2 {
  position: absolute; bottom: 10%; left: 60%;
  width: 20vw; height: 20vw; max-width: 300px; max-height: 300px;
  border: 1px solid var(--primary-light / 0.25);
  border-radius: 50%;
  animation: heroPulse 6s ease-in-out 1s infinite;
}
@keyframes heroPulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.08); opacity: 0.8; }
}
.hero .container { position: relative; z-index: 2; }
.hero-content { max-width: 700px; }
.hero-tag {
  display: inline-block; padding: 0.35rem 1rem;
  background: var(--primary-bg); color: var(--primary);
  border-radius: 100px; font-size: 0.8rem; font-weight: 600;
  letter-spacing: 0.08em; margin-bottom: 1.5rem;
}
.hero h1 { color: oklch(22% 0.01 25); margin-bottom: 1.5rem; font-weight: 900; }
.hero h1 em {
  font-style: normal; color: var(--primary);
  position: relative;
}
.hero h1 em::after {
  content: ''; position: absolute; bottom: 0.15em; left: 0; right: 0;
  height: 0.15em; background: var(--primary-light / 0.5);
  border-radius: 1px;
}
.hero-desc {
  font-size: 1.1rem; color: oklch(42% 0.01 25); line-height: 1.8;
  margin-bottom: 2.5rem; max-width: 560px;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.8rem 1.75rem; border-radius: 0.5rem;
  font-size: 0.95rem; font-weight: 600; cursor: pointer;
  transition: all var(--transition); border: none;
  font-family: inherit; text-decoration: none;
}
.btn-primary {
  background: var(--primary); color: #fff;
  box-shadow: 0 2px 12px oklch(40% 0.18 25 / 0.25);
}
.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: 0 4px 20px oklch(40% 0.18 25 / 0.35);
  transform: translateY(-1px);
}
.btn-outline {
  border: 1.5px solid oklch(55% 0.01 25); background: transparent;
  color: oklch(33% 0.01 25);
}
.btn-outline:hover { background: oklch(55% 0.01 25 / 0.06); border-color: oklch(40% 0.01 25); }
.btn-arrow { transition: transform 0.2s; }
.btn:hover .btn-arrow { transform: translateX(3px); }


/* ===== Section Base ===== */
.section { padding: 5rem 0; }
.section-header { margin-bottom: 3.5rem; }
.section-tag {
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.12em;
  color: var(--primary); text-transform: uppercase;
  margin-bottom: 0.75rem;
}
.section-title { color: oklch(23% 0.01 25); margin-bottom: 0.75rem; }
.section-desc { color: var(--text-secondary); font-size: 1rem; max-width: 500px; }
.section-header.centered { text-align: center; }
.section-header.centered .section-desc { margin: 0 auto; }

/* ===== News Section ===== */
.news-section { background: var(--bg-card); }
.news-list {
  border: 1px solid var(--border);
  border-radius: var(--radius-xl); overflow: hidden;
}
.news-item {
  display: flex; align-items: flex-start; gap: 1.25rem;
  padding: 1.25rem 2rem; transition: background 0.2s;
  border-bottom: 1px solid var(--border-light);
  cursor: pointer; text-decoration: none; color: inherit;
}
.news-item:first-child { padding-top: 1.75rem; }
.news-item:last-child { padding-bottom: 1.75rem; border-bottom: none; }
.news-item:hover { background: oklch(98% 0.003 25); }
.news-date {
  font-family: var(--font-serif);
  font-size: 0.8rem; color: var(--primary); font-weight: 600;
  white-space: nowrap; min-width: 4.5rem;
}
.news-item h4 { font-size: 0.95rem; font-weight: 600; line-height: 1.5; color: var(--text); font-family: var(--font-sans); }
.news-item:hover h4 { color: var(--primary); }

/* ===== Cases / Video Section ===== */
.cases-section { background: var(--bg); }
.cases-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem;
}
.case-card {
  background: var(--bg-card); border-radius: var(--radius-xl); overflow: hidden;
  border: 1px solid var(--border);
  transition: all 0.3s ease;
  display: block; text-decoration: none; color: inherit;
}
.case-card:hover { border-color: oklch(40% 0.18 25 / 0.2); box-shadow: 0 8px 28px oklch(0% 0 0 / 0.05); }
.case-thumb {
  aspect-ratio: 16/9; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  position: relative;
  background-size: cover; background-position: center;
}
.case-play {
  width: 3.5rem; height: 3.5rem; border-radius: 50%;
  background: oklch(100% 0 0 / 0.9);
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.3s; position: relative; z-index: 2;
}
.case-play::after {
  content: ''; display: block; width: 0; height: 0;
  border-left: 0.8rem solid var(--primary);
  border-top: 0.5rem solid transparent;
  border-bottom: 0.5rem solid transparent;
  margin-left: 0.2rem;
}
.case-card:hover .case-play { transform: scale(1.1); }
.case-thumb::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(to top, oklch(20% 0.03 25 / 0.3) 0%, transparent 50%);
  z-index: 1;
}
.case-tag {
  position: absolute; top: 1rem; left: 1rem; z-index: 3;
  padding: 0.25rem 0.75rem; border-radius: 100px;
  background: oklch(100% 0 0 / 0.85); font-size: 0.7rem;
  font-weight: 600; color: var(--primary);
  backdrop-filter: blur(8px);
}
.case-body { padding: 1.5rem; }
.case-body h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.case-body p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.65; }

/* ===== Exam Section ===== */
.exam-section { background: var(--bg-card); }
.exam-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; }
.exam-card {
  background: var(--bg); border-radius: var(--radius-xl); padding: 1.75rem;
  border: 1px solid oklch(92% 0.004 25);
  transition: all 0.3s ease; position: relative; overflow: hidden;
  display: block; text-decoration: none; color: inherit;
}
.exam-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--primary); transform: scaleX(0);
  transition: transform 0.3s ease;
}
.exam-card:hover::before { transform: scaleX(1); }
.exam-card:hover { border-color: oklch(40% 0.18 25 / 0.2); box-shadow: 0 6px 24px oklch(0% 0 0 / 0.04); }
.exam-num {
  font-family: var(--font-serif);
  font-size: 2rem; font-weight: 900; color: oklch(40% 0.18 25 / 0.15);
  line-height: 1; margin-bottom: 0.75rem;
}
.exam-card h3 { font-size: 1rem; margin-bottom: 0.35rem; }
.exam-patient {
  font-size: 0.85rem; font-weight: 600; color: var(--primary);
  margin-bottom: 0.25rem;
}
.exam-card p { font-size: 0.8rem; color: var(--text-secondary); line-height: 1.5; }

/* ===== Pilots Section ===== */
.pilots-section { background: var(--bg); }
.pilots-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
.pilot-card {
  background: var(--bg-card); border-radius: var(--radius-xl); padding: 1.75rem;
  border: 1px solid var(--border); transition: all 0.3s ease;
}
.pilot-card:hover { border-color: oklch(40% 0.18 25 / 0.2); box-shadow: 0 4px 16px oklch(0% 0 0 / 0.04); }
.pilot-header { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1rem; }
.pilot-num {
  width: 2rem; height: 2rem; border-radius: 50%;
  background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 700; flex-shrink: 0;
}
.pilot-header h3 { font-size: 1.1rem; font-weight: 700; color: oklch(22% 0.01 25); flex: 1; }
.pilot-list {
  list-style: none; display: flex; flex-direction: column; gap: 0.4rem;
}
.pilot-list li {
  position: relative; padding-left: 1.25rem;
  font-size: 0.85rem; color: var(--text-secondary); line-height: 1.55;
}
.pilot-list li::before {
  content: ''; position: absolute; left: 0; top: 0.55em;
  width: 6px; height: 6px; border-radius: 50%;
  background: oklch(75% 0.1 25 / 0.5);
}
@media (max-width: 768px) { .pilots-grid { grid-template-columns: 1fr; } }

/* ===== Footer ===== */
.footer {
  background: var(--footer-bg); color: oklch(85% 0.003 25);
  padding: 4rem 0 2rem;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 3rem; margin-bottom: 3rem; }
.footer-brand h3 {
  font-family: var(--font-serif); font-size: 1.25rem; font-weight: 700;
  margin-bottom: 0.75rem; color: #fff;
}
.footer-brand p { font-size: 0.85rem; opacity: 0.6; line-height: 1.7; }
.footer-brand .footer-info { display: flex; flex-direction: column; gap: 0.35rem; margin-top: 1rem; }
.footer-brand .footer-info span { font-size: 0.8rem; opacity: 0.45; }
.footer-nav h4 { font-size: 0.8rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: oklch(70% 0.005 25); margin-bottom: 1rem; }
.footer-nav ul { list-style: none; }
.footer-nav li { margin-bottom: 0.5rem; }
.footer-nav a { font-size: 0.85rem; opacity: 0.55; transition: opacity 0.2s; }
.footer-nav a:hover { opacity: 0.85; }
.footer-bottom {
  border-top: 1px solid oklch(100% 0 0 / 0.08);
  padding-top: 1.5rem; text-align: center;
  font-size: 0.8rem; opacity: 0.45;
}
.footer-icp { margin: 0; }

/* ===== Detail Pages (News Article, Video List, Exam Quiz) ===== */
.detail-page {
  max-width: 820px; margin: 0 auto;
  padding: 6rem 1.5rem 5rem;
}
.detail-breadcrumb {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 0.85rem; color: var(--text-muted);
  margin-bottom: 2.5rem; flex-wrap: wrap;
}
.detail-breadcrumb a { color: var(--primary); transition: color 0.2s; }
.detail-breadcrumb a:hover { color: var(--primary-dark); }
.detail-breadcrumb .sep { color: var(--border); user-select: none; }
.detail-header { margin-bottom: 2.5rem; }
.detail-title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 700; color: oklch(22% 0.01 25);
  line-height: 1.35; margin-bottom: 1rem;
  letter-spacing: -0.01em;
}
.detail-meta {
  display: flex; align-items: center; gap: 1rem;
  font-size: 0.9rem; color: var(--text-muted);
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}
.detail-meta .dot { width: 3px; height: 3px; background: var(--border); border-radius: 50%; }
.detail-content { font-size: 1rem; line-height: 1.9; color: var(--text); margin-bottom: 2rem; }
.detail-content p { margin-bottom: 1.25rem; }
.detail-content h3 {
  font-size: 1.25rem; font-weight: 700; color: oklch(22% 0.01 25);
  margin: 2.25rem 0 1rem; padding-left: 1rem;
  border-left: 3px solid var(--primary);
}
.detail-content strong { color: oklch(22% 0.01 25); }
.detail-content blockquote {
  border-left: 3px solid var(--primary);
  background: oklch(40% 0.18 25 / 0.04);
  padding: 1rem 1.25rem; margin: 1.25rem 0;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.95rem; color: var(--primary-dark);
}
.detail-back { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--border); }
.detail-back a {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-size: 0.9rem; font-weight: 500; color: var(--primary);
  transition: all var(--transition);
}
.detail-back a:hover { color: var(--primary-dark); }

/* Download attachments inside article */
.detail-attachments {
  margin-top: 2.5rem; padding: 1.5rem;
  background: var(--bg); border-radius: var(--radius-lg);
}
.detail-attachments h4 { font-size: 0.9rem; color: var(--text); margin-bottom: 0.75rem; font-family: var(--font-sans); }
.detail-attachment-item {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.6rem 1rem; background: var(--bg-card);
  border-radius: var(--radius); margin-bottom: 0.5rem;
  font-size: 0.85rem; color: var(--primary);
  transition: all var(--transition);
}
.detail-attachment-item:hover { background: oklch(40% 0.18 25 / 0.06); }

/* ===== Video List (Detail Page) ===== */
.video-list-detail { display: flex; flex-direction: column; gap: 0.75rem; margin-bottom: 2.5rem; }
.video-list-item {
  display: flex; align-items: center; gap: 1rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  text-decoration: none; color: inherit;
  transition: all var(--transition);
}
.video-list-item:hover {
  border-color: oklch(40% 0.18 25 / 0.3);
  background: oklch(40% 0.18 25 / 0.03);
  transform: translateX(4px);
}
.video-list-thumb {
  width: 5rem; height: 3.5rem; flex-shrink: 0;
  background: linear-gradient(135deg, oklch(40% 0.12 25), oklch(28% 0.14 25));
  border-radius: var(--radius); display: flex; align-items: center; justify-content: center;
}
.video-list-play {
  width: 1.75rem; height: 1.75rem;
  background: oklch(100% 0 0 / 0.9); border-radius: 50%;
  position: relative;
}
.video-list-play::after {
  content: ''; position: absolute; top: 50%; left: 55%;
  transform: translate(-50%, -50%);
  width: 0; height: 0;
  border-left: 0.55rem solid var(--primary);
  border-top: 0.3rem solid transparent;
  border-bottom: 0.3rem solid transparent;
}
.video-list-info { flex: 1; min-width: 0; }
.video-list-title { font-size: 0.95rem; font-weight: 600; color: var(--text); margin-bottom: 0.25rem; line-height: 1.4;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.video-list-speaker { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 0.15rem; }
.video-list-views { font-size: 0.7rem; color: var(--text-muted); }
.video-more-card {
  display: flex; align-items: center; justify-content: center;
  padding: 1.5rem; text-align: center;
  border: 2px dashed var(--border); border-radius: var(--radius-lg);
  color: var(--text-muted); cursor: pointer; text-decoration: none;
  transition: all var(--transition);
}
.video-more-card:hover { border-color: var(--primary); color: var(--primary); }
.video-more-text { font-size: 0.9rem; font-weight: 500; }

/* ===== Exam Questions ===== */
.exam-qa-section { margin-top: 2.5rem; }
.exam-qa-section h3 { font-size: 1.25rem; font-weight: 700; color: oklch(22% 0.01 25); margin-bottom: 1.5rem; }
.exam-question {
  padding: 1.75rem; margin-bottom: 1rem;
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  background: var(--bg-card);
}
.exam-q-header { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.9rem; }
.exam-q-num {
  width: 1.75rem; height: 1.75rem;
  background: var(--primary); color: #fff;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 700;
}
.exam-q-type {
  font-size: 0.7rem; font-weight: 600;
  padding: 0.15rem 0.5rem; border-radius: 100px;
  background: var(--primary-bg); color: var(--primary);
}
.exam-q-text { font-size: 0.95rem; font-weight: 600; color: var(--text); line-height: 1.7; margin-bottom: 1rem; }
.exam-q-options { display: flex; flex-direction: column; gap: 0.5rem; }
.exam-option {
  display: flex; align-items: flex-start; gap: 0.6rem;
  padding: 0.75rem 1rem; border: 1px solid var(--border);
  border-radius: var(--radius); cursor: pointer;
  transition: all var(--transition); font-size: 0.9rem; line-height: 1.6;
}
.exam-option:hover { border-color: oklch(40% 0.18 25 / 0.3); background: oklch(40% 0.18 25 / 0.04); }
.exam-option input { margin-top: 0.15rem; accent-color: var(--primary); }
.opt-label { font-weight: 700; color: var(--primary); min-width: 1.25rem; }
.opt-text { color: var(--text); }
.exam-q-answer {
  margin-top: 1rem; padding: 1rem 1.25rem;
  background: oklch(97% 0.02 150); border-radius: var(--radius);
  border-left: 3px solid oklch(55% 0.15 150);
}
.exam-ans-hidden { display: none; }
.exam-ans-tag { font-size: 0.8rem; font-weight: 700; color: oklch(50% 0.13 150); margin-bottom: 0.5rem; }
.exam-ans-text { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }
.exam-show-ans {
  margin-top: 0.75rem; padding: 0.5rem 1.25rem;
  border: 1px solid oklch(40% 0.18 25 / 0.3);
  background: var(--bg-card); color: var(--primary);
  border-radius: var(--radius); font-size: 0.8rem;
  font-weight: 500; cursor: pointer; transition: all var(--transition);
}
.exam-show-ans:hover { background: oklch(40% 0.18 25 / 0.06); }

/* ===== Floating Download Button ===== */
.floating-download {
  position: fixed; bottom: 2rem; right: 2rem; z-index: 999;
}
.floating-download-trigger {
  width: 3.5rem; height: 3.5rem;
  background: var(--primary); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 20px oklch(40% 0.18 25 / 0.3);
  transition: all var(--transition);
}
.floating-download-trigger:hover {
  background: var(--primary-dark);
  transform: scale(1.05);
  box-shadow: 0 6px 28px oklch(40% 0.18 25 / 0.4);
}
.floating-download-popup {
  position: absolute; bottom: 4rem; right: 0;
  background: var(--bg-card); border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px oklch(0% 0 0 / 0.12);
  border: 1px solid var(--border); padding: 1.25rem;
  min-width: 280px; display: none;
}
.floating-download-popup.show { display: block; }
.floating-download-title {
  font-size: 0.9rem; font-weight: 700; color: oklch(22% 0.01 25);
  margin-bottom: 0.75rem; padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
}
.floating-download-item {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.6rem 0.9rem; border-radius: var(--radius);
  text-decoration: none; color: var(--text);
  font-size: 0.9rem; font-weight: 500;
  transition: all var(--transition);
}
.floating-download-item:hover { background: oklch(40% 0.18 25 / 0.06); }
.fdi-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 2.75rem; height: 1.75rem; border-radius: 4px;
  font-size: 0.7rem; font-weight: 700; color: #fff;
}
.fdi-icon.docx { background: #1856a5; }
.fdi-icon.pdf { background: #c00000; }

/* ===== Scroll Reveal ===== */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.8s ease, transform 0.8s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== Empty State ===== */
.empty-state {
  text-align: center; padding: 5rem 1.25rem; color: var(--text-muted);
}
.empty-state-icon { font-size: 3rem; margin-bottom: 1rem; opacity: 0.3; }
.empty-state-title { font-size: 1.1rem; font-weight: 600; color: var(--text-secondary); margin-bottom: 0.5rem; }
.empty-state-desc { font-size: 0.9rem; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .exam-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: block; }
  .nav.open .nav-links {
    display: flex; flex-direction: column; position: absolute;
    top: 4.5rem; left: 0; right: 0; background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 1rem; gap: 0; box-shadow: 0 8px 24px oklch(0% 0 0 / 0.08);
  }
  .nav.open .nav-links a { padding: 0.75rem 1rem; }
  .hero { min-height: auto; padding: 2rem 0 1rem; }
  .hero-accent, .hero-accent2 { display: none; }
  .cases-grid { grid-template-columns: 1fr; }
  .exam-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { }
  .detail-page { padding: 5rem 1rem 3rem; }
  .floating-download { bottom: 1.25rem; right: 1.25rem; }
}

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