/* ============================================
   AIRSAT International Website — Global Styles
   Dark cinematic visual system
   ============================================ */

/* Self-hosted fonts (offline-safe, no external CDN) */
@import url('fonts.css');

/* ===== RESET ===== */
*, *::before, *::after {
  margin: 0; padding: 0; box-sizing: border-box;
}
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* ===== DESIGN TOKENS ===== */
:root {
  --bg: #05070A;
  --bg-elevated: #0B101A;
  --bg-card: #0F1524;
  --bg-card-hover: #151D30;
  --bg-hero: #03050A;
  --bg-overlay: rgba(5, 7, 10, 0.72);

  --text: #FFFFFF;
  --text-secondary: #A8B5CC;
  --text-muted: #6C7A99;

  --accent: #00B4FF;
  --accent-dim: rgba(0, 180, 255, 0.12);
  --accent-glow: rgba(0, 180, 255, 0.35);
  --accent-2: #FF8C32;
  --accent-2-dim: rgba(255, 140, 50, 0.12);

  --border: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(255, 255, 255, 0.18);
  --border-subtle: rgba(255, 255, 255, 0.06);

  --font-display: 'Space Grotesk', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --font-arabic: 'Noto Sans Arabic', 'Segoe UI', 'Tahoma', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  --nav-height: 76px;
  --container: 1320px;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-lg: 0 24px 80px rgba(0, 0, 0, 0.45);
  --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.28);
  --transition: 0.28s cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* Arabic overrides */
html[lang="ar"] body {
  font-family: var(--font-arabic);
}
html[lang="zh"] body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', sans-serif;
}

/* ===== UTILITIES ===== */
.container {
  width: min(92%, var(--container));
  margin: 0 auto;
}
.container-sm { width: min(92%, 980px); margin: 0 auto; }

.section {
  padding: 110px 0;
  position: relative;
}
.section-alt { background: var(--bg-elevated); }
.section-dark { background: var(--bg-hero); }

.eyebrow {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: '';
  width: 34px; height: 2px;
  background: var(--accent);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text);
}

.title-xl {
  font-size: clamp(44px, 7vw, 92px);
  line-height: 0.98;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}
.title-lg {
  font-size: clamp(34px, 5vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}
.title-md {
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.12;
}
.title-sm {
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.2;
}

.body-lg {
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.75;
  color: var(--text-secondary);
}
.body-md {
  font-size: 16px;
  color: var(--text-secondary);
}

.text-muted { color: var(--text-muted); }
.text-accent { color: var(--accent); }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #00101A;
  box-shadow: 0 8px 24px var(--accent-glow);
}
.btn-primary:hover {
  background: #4DD2FF;
  box-shadow: 0 12px 34px var(--accent-glow);
  transform: translateY(-2px);
}
.btn-outline {
  border: 1px solid var(--border-strong);
  color: var(--text);
  background: rgba(255,255,255,0.04);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.10);
  border-color: var(--text);
}
.btn-ghost {
  color: var(--accent);
  padding: 10px 0;
  border-bottom: 1px solid transparent;
  border-radius: 0;
}
.btn-ghost:hover {
  border-bottom-color: var(--accent);
}
.btn-group { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }

/* ===== NAVIGATION ===== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex; align-items: center;
  justify-content: space-between;
  padding: 0 48px;
  background: rgba(5, 7, 10, 0.78);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition), box-shadow var(--transition);
}
.nav.scrolled {
  background: rgba(5, 7, 10, 0.94);
  box-shadow: 0 10px 40px rgba(0,0,0,0.4);
}
.nav-logo img { height: 36px; width: auto; }
.nav-links {
  display: flex; align-items: center;
  gap: 32px;
}
.nav-links > li { position: relative; }
.nav-links > li > a {
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-secondary);
  padding: 28px 0;
  display: block;
  transition: color var(--transition);
}
.nav-links > li > a:hover,
.nav-links > li > a.active { color: var(--text); }
.nav-links > li > a::after {
  content: ''; position: absolute;
  bottom: 18px; left: 0;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}
.nav-links > li > a:hover::after,
.nav-links > li > a.active::after { width: 100%; }
/* Aurora Program 保持品牌混合大小写（改版方案 §1.2），不随导航全大写规则 */
.nav-links > li > a.nav-aurora {
  text-transform: none;
  letter-spacing: 0.6px;
}

.nav-dropdown {
  position: absolute;
  top: 100%; left: 50%;
  transform: translateX(-50%) translateY(10px);
  min-width: 260px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-top: 2px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 14px 0;
  opacity: 0; visibility: hidden;
  transition: all var(--transition);
  box-shadow: var(--shadow-lg);
  z-index: 1001;
}
.nav-links > li:hover .nav-dropdown {
  opacity: 1; visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown a {
  display: block;
  padding: 11px 24px;
  font-size: 14px;
  color: var(--text-secondary);
  transition: color var(--transition), padding var(--transition);
}
.nav-dropdown a:hover {
  color: var(--text);
  padding-left: 30px;
}

.nav-right { display: flex; align-items: center; gap: 18px; }
.nav-cta {
  padding: 12px 22px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  background: var(--accent);
  color: #00101A;
  transition: all var(--transition);
}
.nav-cta:hover {
  background: #4DD2FF;
  transform: translateY(-1px);
}

/* Language switcher */
.lang-switcher {
  display: flex; align-items: center;
  gap: 4px;
  padding: 4px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  direction: ltr; /* keep 中/EN/FR/AR order consistent even on RTL pages */
}
.lang-btn {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  padding: 7px 12px;
  border-radius: 100px;
  color: var(--text-muted);
  transition: all var(--transition);
}
.lang-btn:hover { color: var(--text); }
.lang-btn.active {
  background: var(--accent);
  color: #00101A;
}

.nav-mobile-toggle { display: none; }

/* ===== LANG SWITCHER — 7 LANGUAGES ===== */
@media (max-width: 1240px) {
  .lang-switcher { gap: 2px; padding: 3px; }
  .lang-btn { padding: 6px 9px; font-size: 10.5px; letter-spacing: 0.3px; }
}
@media (max-width: 900px) {
  .lang-switcher { gap: 1px; padding: 2px; }
  .lang-btn { padding: 5px 7px; font-size: 10px; letter-spacing: 0; }
}
@media (max-width: 520px) {
  .lang-btn { padding: 4px 5px; font-size: 9.5px; }
}


/* ===== HERO ===== */
.page-hero {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
}
.hero-video-bg,
.hero-image-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-video-bg video,
.hero-image-bg img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.hero-overlay {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(90deg, rgba(5,7,10,0.92) 0%, rgba(5,7,10,0.62) 55%, rgba(5,7,10,0.35) 100%);
}
.hero-overlay-bottom {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(180deg, rgba(5,7,10,0.35) 0%, rgba(5,7,10,0.82) 88%, var(--bg) 100%);
}
.hero-content {
  position: relative; z-index: 2;
  width: min(92%, var(--container));
  margin: 0 auto;
  padding: 80px 0 140px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 9px 18px;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(0,180,255,0.08);
  margin-bottom: 34px;
}
.hero-badge::before {
  content: ''; width: 7px; height: 7px;
  border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 2s infinite;
}
.hero-title { max-width: 920px; }
.hero-subtitle {
  max-width: 660px;
  margin-top: 28px;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.65;
  color: var(--text-secondary);
}
.hero-actions { margin-top: 44px; }
.hero-stats {
  display: flex; gap: 48px;
  margin-top: 70px;
  padding-top: 36px;
  border-top: 1px solid var(--border-subtle);
}
.hero-stat {
  display: flex; flex-direction: column;
  gap: 6px;
}
.hero-stat .num {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}
.hero-stat .label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-muted);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

/* ===== SECTION HEADER ===== */
.section-header {
  max-width: 760px;
  margin-bottom: 64px;
}
.section-header.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-header .eyebrow { justify-content: center; }
.section-header.center .eyebrow::before,
.section-header.center .eyebrow::after { width: 34px; height: 2px; background: var(--accent); }
.section-header.center .eyebrow::after { content: ''; }

/* ===== CARDS ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.card-grid-3 { grid-template-columns: repeat(3, 1fr); }
.card-grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.card:hover {
  transform: translateY(-6px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-card);
}
.card-media { overflow: hidden; aspect-ratio: 16/10; }
.card-media img,
.card-media video {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.card:hover .card-media img,
.card:hover .card-media video { transform: scale(1.05); }
.card-body { padding: 28px; }
.card-eyebrow {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.card-title {
  font-size: 22px;
  margin-bottom: 12px;
}
.card-text {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 18px;
}

/* ===== STATS GRID ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  overflow: hidden;
}
.stat-box {
  background: var(--bg-card);
  padding: 42px 28px;
  text-align: center;
}
.stat-box .num {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}
.stat-box .num .unit {
  font-size: 22px;
  color: var(--accent);
  margin-left: 2px;
}
.stat-box .label {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-secondary);
}

/* ===== SPLIT SECTION ===== */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.split-media {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-lg);
}
.split-media img,
.split-media video { width: 100%; height: auto; object-fit: cover; }
.split-content .eyebrow { margin-bottom: 20px; }

/* ===== FEATURE LIST ===== */
.feature-list { margin-top: 28px; display: grid; gap: 16px; }
.feature-item {
  display: flex; gap: 16px;
  padding: 18px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}
.feature-icon {
  width: 42px; height: 42px;
  flex-shrink: 0;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 18px;
}
.feature-title {
  font-size: 16px;
  margin-bottom: 4px;
}
.feature-desc {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ===== TIMELINE ===== */
.timeline {
  position: relative;
  padding-left: 28px;
}
.timeline::before {
  content: ''; position: absolute;
  top: 0; bottom: 0; left: 6px;
  width: 2px;
  background: var(--border);
}
.timeline-item {
  position: relative;
  padding-bottom: 36px;
}
.timeline-item::before {
  content: ''; position: absolute;
  left: -26px; top: 4px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 4px var(--accent-dim);
}
.timeline-date {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--accent);
  margin-bottom: 6px;
}
.timeline-title { font-size: 18px; margin-bottom: 6px; }
.timeline-text { font-size: 14px; color: var(--text-secondary); }

/* ===== COMPARISON TABLE ===== */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 28px;
  font-size: 15px;
}
.compare-table th,
.compare-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  text-align: left;
}
.compare-table th {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-muted);
  background: rgba(255,255,255,0.03);
}
.compare-table tr.highlight td {
  background: var(--accent-dim);
  color: var(--text);
}

/* ===== CTA STRIP ===== */
.cta-strip {
  position: relative;
  padding: 90px 0;
  overflow: hidden;
}
.cta-strip-bg {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, #0A1A3A 0%, #05070A 100%);
}
.cta-strip-bg img,
.cta-strip-bg video {
  width: 100%; height: 100%; object-fit: cover; opacity: 0.25;
}
.cta-strip-content {
  position: relative; z-index: 2;
  width: min(92%, var(--container));
  margin: 0 auto;
  text-align: center;
}
.cta-strip .title-lg { margin-bottom: 18px; }
.cta-strip .body-lg { max-width: 620px; margin: 0 auto 32px; }

/* ===== NEWS GRID ===== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.news-card .card-media { aspect-ratio: 4/3; }
.news-card .card-date {
  font-size: 12px; font-weight: 600;
  letter-spacing: 1px; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 10px;
}
.news-card .card-title { font-size: 19px; }

/* ===== CONTACT / FORM ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 48px;
}
.form-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 40px;
}
.form-group { margin-bottom: 22px; }
.form-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 14px 18px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 15px;
  transition: border-color var(--transition), background var(--transition);
  /* 下拉框跟随页面暗色主题，避免 OS 浅色背景 + 白色文字导致选项"一片空白" */
  color-scheme: dark;
}
.form-group select option {
  background: var(--bg-card);
  color: var(--text);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(255,255,255,0.06);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-muted); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.contact-info-list { display: grid; gap: 22px; margin-top: 28px; }
.contact-info-item {
  display: flex; gap: 16px;
  padding: 18px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}
.contact-info-item i {
  width: 40px; height: 40px;
  flex-shrink: 0;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent);
}

/* ===== FOOTER ===== */
.footer {
  background: var(--bg-hero);
  border-top: 1px solid var(--border-subtle);
  padding: 80px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}
.footer-brand img { height: 38px; width: auto; margin-bottom: 18px; }
.footer-brand p {
  font-size: 14px; color: var(--text-secondary);
  line-height: 1.7; max-width: 340px;
}
.footer-col h4 {
  font-size: 13px; font-weight: 700;
  letter-spacing: 1.2px; text-transform: uppercase;
  color: var(--text);
  margin-bottom: 22px;
}
.footer-col ul { display: grid; gap: 12px; }
.footer-col a {
  font-size: 14px; color: var(--text-secondary);
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 28px;
  border-top: 1px solid var(--border-subtle);
  font-size: 13px; color: var(--text-muted);
}
.footer-social { display: flex; gap: 14px; }
.footer-social a {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: 50%;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  transition: all var(--transition);
}
.footer-social a:hover {
  border-color: var(--accent); color: var(--accent);
}

/* ===== RTL OVERRIDES ===== */
html[dir="rtl"] .eyebrow::before { order: 2; }
html[dir="rtl"] .split { direction: rtl; }
html[dir="rtl"] .split > * { direction: ltr; }
html[dir="rtl"] .feature-item { flex-direction: row-reverse; text-align: right; }
html[dir="rtl"] .contact-info-item { flex-direction: row-reverse; text-align: right; }
html[dir="rtl"] .compare-table th,
html[dir="rtl"] .compare-table td { text-align: right; }

/* ===== MOBILE ===== */
@media (max-width: 1024px) {
  .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; gap: 40px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* ===== REVEAL ANIMATIONS ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 768px) {
  :root { --nav-height: 68px; }
  .nav { padding: 0 20px; }
  .nav-links,
  .nav-right .nav-cta { display: none; }
  .nav-mobile-toggle {
    display: flex; flex-direction: column; gap: 5px;
    width: 32px; height: 32px;
    justify-content: center;
  }
  .nav-mobile-toggle span {
    display: block; width: 24px; height: 2px;
    background: var(--text); border-radius: 2px;
  }
  .nav.active .nav-links {
    display: flex; flex-direction: column;
    position: fixed; top: var(--nav-height); left: 0; right: 0; bottom: 0;
    background: var(--bg-elevated);
    padding: 30px;
    gap: 6px;
  }
  .nav.active .nav-links > li > a { padding: 14px 0; font-size: 15px; }
  .nav.active .nav-dropdown {
    position: static; opacity: 1; visibility: visible;
    transform: none; box-shadow: none; border: none;
    background: transparent; padding: 0 0 0 16px;
  }
  .card-grid-4, .card-grid-3, .news-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; gap: 24px; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .section { padding: 70px 0; }
  .hero-content { padding: 50px 0 80px; }
}


/* ===== EMPTY STATE (新闻空白档) ===== */
.empty-state {
  max-width: 760px;
  margin: 0 auto;
  padding: 58px 44px;
  text-align: center;
  background: var(--bg-card);
  border: 1px dashed rgba(0, 180, 255, 0.26);
  border-radius: var(--radius);
}
.empty-state .empty-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto 20px;
  color: var(--accent);
  opacity: 0.85;
}
.empty-state .empty-icon svg { display: block; width: 100%; height: 100%; }
.empty-state .empty-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text);
  margin-bottom: 14px;
}
html[lang="zh"] .empty-state .empty-title,
html[lang="ar"] .empty-state .empty-title { letter-spacing: 0.04em; }
.empty-state .empty-text {
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}
.empty-state .empty-mail { margin-top: 22px; font-size: 15px; }
.empty-state .empty-mail a { color: var(--accent); }
@media (max-width: 640px) {
  .empty-state { padding: 44px 24px; }
}

/* ===== 模块小标题（9.20 收尾修复） ===== */
.values-heading { margin-top: 36px; margin-bottom: 20px; }
.stats-title { text-align: center; margin-bottom: 36px; }
.section-header p + p { margin-top: 20px; }
/* ===== DOWNLOAD CARDS（改版方案 §4 下载功能部署规则） ===== */
.dl-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}
.dl-card {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.dl-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.dl-icon {
  flex: 0 0 auto;
  width: 48px; height: 48px;
  display: grid; place-items: center;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-subtle);
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 11px; font-weight: 700; letter-spacing: 0.5px;
}
.dl-body { flex: 1 1 auto; min-width: 0; }
.dl-name { font-size: 18px; margin-bottom: 8px; }
.dl-note { font-size: 14px; line-height: 1.65; color: var(--text-secondary); }
.dl-action { margin-top: 18px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.btn-download.is-pending { opacity: 0.5; cursor: not-allowed; pointer-events: none; }
.dl-pending {
  font-size: 11px; letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-secondary);
}
@media (max-width: 520px) {
  .dl-card { flex-direction: column; }
}

/* ===== 品牌名大小写 + Hero 补充文案（9.20 方案对齐） ===== */
.brand-case { text-transform: none; }
.hero-lead {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 760px;
  margin-top: 14px;
}

/* ===== 合作模式卡 + 技术分组 + 表单勾选（9.20 方案 §3.8 §3.9 §2.1） ===== */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.partner-card {
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.partner-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.partner-icon {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-subtle);
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 13px; font-weight: 700; letter-spacing: 0.5px;
  margin-bottom: 18px;
}
.partner-name { font-size: 17px; margin-bottom: 10px; }
.partner-text { font-size: 14px; line-height: 1.65; color: var(--text-secondary); }

.tech-group-title {
  margin-top: 48px;
  margin-bottom: 24px;
  color: var(--text);
}
.section-header + .tech-group-title { margin-top: 8px; }

.form-wrap { max-width: 820px; margin: 0 auto; }
.btn-block { width: 100%; margin-top: 8px; }
.checkbox-group label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--text-secondary);
  cursor: pointer;
}
.checkbox-group input[type="checkbox"] {
  width: auto;
  margin: 3px 0 0;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ---- Academic news list (NEWS page) ---- */
.news-list { display: flex; flex-direction: column; }
.news-item { display: flex; gap: 28px; padding: 26px 4px; border-bottom: 1px solid var(--border-subtle); }
.news-item:first-child { border-top: 1px solid var(--border-subtle); }
.news-date { flex: 0 0 110px; font-family: var(--font-display); font-size: 13px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: var(--text-muted); padding-top: 5px; }
.news-item-title { font-family: var(--font-display); font-size: 18px; line-height: 1.45; margin: 0 0 8px; color: var(--text); }
.news-item-desc { font-size: 14.5px; line-height: 1.7; color: var(--text-secondary); margin: 0 0 12px; max-width: 860px; }
.news-item-link { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; color: var(--accent); text-decoration: none; }
.news-item-link:hover { text-decoration: underline; }
[dir="rtl"] .news-item { flex-direction: row-reverse; }
@media (max-width: 720px) {
  .news-item { flex-direction: column; gap: 6px; }
  .news-date { flex-basis: auto; padding-top: 0; }
}