/* ============================================
   光速之维 · 科技感官网主样式
   ============================================ */

:root {
  --bg-dark: #05070f;
  --bg-panel: #0a0f1e;
  --bg-card: rgba(15, 22, 45, 0.6);
  --bg-card-hover: rgba(25, 35, 70, 0.7);
  --border: rgba(0, 212, 255, 0.15);
  --border-strong: rgba(0, 212, 255, 0.4);
  --text-primary: #e8ecf4;
  --text-secondary: #8a95ad;
  --text-muted: #5c6680;
  --cyan: #00d4ff;
  --cyan-soft: #22e6ff;
  --purple: #a855f7;
  --purple-soft: #c084fc;
  --green: #00ff88;
  --pink: #ff3d8b;
  --glow-cyan: 0 0 20px rgba(0, 212, 255, 0.4), 0 0 40px rgba(0, 212, 255, 0.15);
  --glow-purple: 0 0 20px rgba(168, 85, 247, 0.4), 0 0 40px rgba(168, 85, 247, 0.15);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

/* 全局网格背景 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, rgba(0,0,0,0.9) 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, rgba(0,0,0,0.9) 0%, transparent 75%);
  pointer-events: none;
  z-index: 0;
}

/* 顶部光晕 */
body::after {
  content: "";
  position: fixed;
  top: -40%; left: 50%;
  transform: translateX(-50%);
  width: 1200px; height: 800px;
  background: radial-gradient(ellipse, rgba(0, 212, 255, 0.18) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ============================================
   导航栏
   ============================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(5, 7, 15, 0.6);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s, box-shadow 0.3s;
}
.nav.scrolled {
  background: rgba(5, 7, 15, 0.92);
  box-shadow: 0 4px 30px rgba(0, 212, 255, 0.08);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 18px;
}
.logo-mark {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  display: grid;
  place-items: center;
  box-shadow: var(--glow-cyan);
  position: relative;
  overflow: hidden;
}
.logo-mark::after {
  content: "";
  position: absolute; inset: 3px;
  border-radius: 7px;
  background: var(--bg-dark);
}
.logo-mark::before {
  content: "光";
  position: relative;
  z-index: 1;
  font-weight: 900;
  background: linear-gradient(135deg, var(--cyan), var(--purple-soft));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: 16px;
}
.logo-text {
  background: linear-gradient(90deg, var(--cyan-soft), var(--text-primary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.logo-sub {
  display: block;
  font-size: 11px;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 2px;
}

.nav-links {
  display: flex;
  gap: 4px;
  list-style: none;
}
.nav-links a {
  display: block;
  padding: 10px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
  position: relative;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: rgba(0, 212, 255, 0.08);
}
.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 50%; bottom: 2px;
  transform: translateX(-50%);
  width: 16px; height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  border-radius: 2px;
}
.nav-cta {
  padding: 10px 20px !important;
  background: linear-gradient(90deg, var(--cyan), var(--purple)) !important;
  color: #000 !important;
  font-weight: 600;
  border-radius: 8px;
  box-shadow: var(--glow-cyan);
  transition: transform 0.2s, box-shadow 0.2s !important;
}
.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 24px rgba(0, 212, 255, 0.6), 0 0 48px rgba(168, 85, 247, 0.3) !important;
}

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 18px; height: 2px;
  margin: 4px auto;
  background: var(--cyan);
}

/* ============================================
   通用按钮
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 10px;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn-primary {
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  color: #000;
  box-shadow: var(--glow-cyan);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 28px rgba(0, 212, 255, 0.7), 0 0 56px rgba(168, 85, 247, 0.35);
}
.btn-ghost {
  background: transparent;
  color: var(--cyan-soft);
  border: 1px solid var(--border-strong);
}
.btn-ghost:hover {
  background: rgba(0, 212, 255, 0.08);
  border-color: var(--cyan);
}

/* ============================================
   Hero 区
   ============================================ */
.hero {
  position: relative;
  padding: 180px 0 120px;
  text-align: center;
  overflow: hidden;
}
.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.5;
  animation: float 12s ease-in-out infinite;
}
.hero-orb.a {
  width: 400px; height: 400px;
  background: radial-gradient(circle, var(--cyan) 0%, transparent 70%);
  top: 10%; left: -10%;
}
.hero-orb.b {
  width: 500px; height: 500px;
  background: radial-gradient(circle, var(--purple) 0%, transparent 70%);
  top: 20%; right: -15%;
  animation-delay: -4s;
}
.hero-orb.c {
  width: 300px; height: 300px;
  background: radial-gradient(circle, var(--green) 0%, transparent 70%);
  bottom: 0%; left: 40%;
  animation-delay: -8s;
}
@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(30px, -20px); }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--cyan-soft);
  margin-bottom: 28px;
  backdrop-filter: blur(8px);
}
.hero-badge .dot {
  width: 6px; height: 6px;
  background: var(--green);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.4); }
}

.hero h1 {
  font-size: clamp(40px, 7vw, 84px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -1px;
  margin-bottom: 24px;
}
.hero h1 .gradient {
  background: linear-gradient(90deg, var(--cyan-soft), var(--purple-soft));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p {
  font-size: clamp(16px, 1.5vw, 19px);
  color: var(--text-secondary);
  max-width: 720px;
  margin: 0 auto 36px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-visual {
  margin-top: 80px;
  position: relative;
}
.hero-panel {
  max-width: 960px;
  margin: 0 auto;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(20, 30, 60, 0.7), rgba(10, 15, 30, 0.9));
  border: 1px solid var(--border);
  padding: 24px;
  box-shadow: 0 20px 80px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(0, 212, 255, 0.1);
  position: relative;
  overflow: hidden;
}
.hero-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(0, 212, 255, 0.06) 100%);
  pointer-events: none;
}
.panel-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}
.panel-tab {
  width: 12px; height: 12px;
  border-radius: 50%;
}
.panel-tab:nth-child(1) { background: #ff5f56; }
.panel-tab:nth-child(2) { background: #ffbd2e; }
.panel-tab:nth-child(3) { background: #27c93f; }
.panel-body {
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.8;
  position: relative;
  z-index: 1;
}
.panel-body .k { color: var(--purple-soft); }
.panel-body .s { color: var(--green); }
.panel-body .n { color: var(--cyan-soft); }
.panel-body .c { color: var(--text-muted); font-style: italic; }

/* ============================================
   通用 Section
   ============================================ */
.section {
  padding: 120px 0;
  position: relative;
}
.section-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-tag {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 3px;
  color: var(--cyan-soft);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}
.section-desc {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   卡片
   ============================================ */
.grid {
  display: grid;
  gap: 24px;
}
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  transition: transform 0.3s, border-color 0.3s, background 0.3s, box-shadow 0.3s;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
}
.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
}
.card:hover {
  transform: translateY(-6px);
  border-color: var(--border-strong);
  background: var(--bg-card-hover);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 30px rgba(0, 212, 255, 0.1);
}
.card-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  margin-bottom: 20px;
  font-size: 26px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.2), rgba(168, 85, 247, 0.2));
  border: 1px solid var(--border);
  color: var(--cyan-soft);
}
.card h3 {
  font-size: 20px;
  margin-bottom: 12px;
  font-weight: 700;
}
.card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

/* ============================================
   数据指标
   ============================================ */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 56px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.05), rgba(168, 85, 247, 0.05));
  border: 1px solid var(--border);
  border-radius: 20px;
  margin-top: 40px;
}
.stat-item { text-align: center; }
.stat-num {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 800;
  background: linear-gradient(90deg, var(--cyan-soft), var(--purple-soft));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
}
.stat-label {
  margin-top: 10px;
  color: var(--text-secondary);
  font-size: 14px;
}

/* ============================================
   产品特性条
   ============================================ */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  padding: 80px 0;
}
.feature-row.reverse { direction: rtl; }
.feature-row.reverse > * { direction: ltr; }
.feature-visual {
  aspect-ratio: 4/3;
  border-radius: 20px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(168, 85, 247, 0.1));
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: center;
}
.feature-visual::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.08) 1px, transparent 1px);
  background-size: 20px 20px;
}
.feature-visual .glyph {
  font-size: 80px;
  position: relative;
  z-index: 1;
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 20px rgba(0, 212, 255, 0.4));
}
.feature-title {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  margin-bottom: 20px;
}
.feature-desc {
  color: var(--text-secondary);
  margin-bottom: 24px;
}
.feature-list {
  list-style: none;
}
.feature-list li {
  padding: 10px 0;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  color: var(--text-primary);
}
.feature-list li::before {
  content: "✦";
  color: var(--cyan);
  flex-shrink: 0;
}

/* ============================================
   CTA
   ============================================ */
.cta {
  padding: 100px 0;
  text-align: center;
  position: relative;
}
.cta-box {
  max-width: 800px;
  margin: 0 auto;
  padding: 72px 48px;
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.08), rgba(168, 85, 247, 0.08));
  border: 1px solid var(--border-strong);
  position: relative;
  overflow: hidden;
}
.cta-box::before {
  content: "";
  position: absolute;
  inset: -2px;
  background: linear-gradient(135deg, var(--cyan), var(--purple), var(--cyan));
  opacity: 0.15;
  filter: blur(40px);
  z-index: -1;
}
.cta h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  margin-bottom: 16px;
}
.cta p {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

/* ============================================
   页脚
   ============================================ */
.footer {
  padding: 80px 0 32px;
  border-top: 1px solid var(--border);
  position: relative;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 12px;
}
.footer-right {
  text-align: right;
}
.footer-right h4 {
  font-size: 14px;
  color: var(--text-primary);
  margin-bottom: 20px;
  letter-spacing: 1px;
}
.footer-right p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 10px;
}
.footer-right a {
  color: var(--text-secondary);
  text-decoration: none;
}
.footer-right a:hover { color: var(--cyan-soft); }
.footer-col h4 {
  font-size: 14px;
  color: var(--text-primary);
  margin-bottom: 20px;
  letter-spacing: 1px;
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 12px; }
.footer-col a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--cyan-soft); }
.footer-contact p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 10px;
}
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 13px;
  text-align: center;
}
.footer-bottom a {
  color: var(--text-muted);
  text-decoration: none;
  margin: 0 6px;
}
.footer-bottom a:hover { color: var(--cyan-soft); }

/* ============================================
   子页面 Hero
   ============================================ */
.page-hero {
  padding: 180px 0 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-hero h1 {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}
.page-hero h1 .gradient {
  background: linear-gradient(90deg, var(--cyan-soft), var(--purple-soft));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.page-hero p {
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  font-size: 17px;
}

/* ============================================
   时间轴（关于我们）
   ============================================ */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0; bottom: 0;
  transform: translateX(-50%);
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--purple));
  opacity: 0.4;
}
.timeline-item {
  position: relative;
  padding: 32px 0;
}
.timeline-item:nth-child(odd) { padding-right: 50%; text-align: right; }
.timeline-item:nth-child(even) { padding-left: 50%; }
.timeline-dot {
  position: absolute;
  left: 50%;
  top: 36px;
  transform: translateX(-50%);
  width: 16px; height: 16px;
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  border-radius: 50%;
  box-shadow: var(--glow-cyan);
}
.timeline-year {
  font-size: 14px;
  color: var(--cyan-soft);
  font-weight: 600;
  margin-bottom: 6px;
}
.timeline-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 6px;
}
.timeline-desc {
  color: var(--text-secondary);
  font-size: 14px;
}

/* ============================================
   案例卡片
   ============================================ */
.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
}
.case-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 30px rgba(0, 212, 255, 0.15);
}
.case-cover {
  height: 200px;
  position: relative;
  overflow: hidden;
}
.case-cover::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 30%, rgba(5,7,15,0.9) 100%);
}
.case-body {
  padding: 24px;
}
.case-tag {
  display: inline-block;
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(0, 212, 255, 0.1);
  color: var(--cyan-soft);
  margin-bottom: 10px;
}
.case-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}
.case-desc {
  color: var(--text-secondary);
  font-size: 14px;
}

/* ============================================
   团队卡片
   ============================================ */
.team-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px 24px;
  text-align: center;
  transition: transform 0.3s, border-color 0.3s;
}
.team-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-strong);
}
.team-avatar {
  width: 100px; height: 100px;
  border-radius: 50%;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  display: grid;
  place-items: center;
  font-size: 36px;
  font-weight: 700;
  color: #000;
  box-shadow: var(--glow-cyan);
}
.team-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}
.team-role {
  color: var(--cyan-soft);
  font-size: 13px;
  margin-bottom: 12px;
}
.team-bio {
  color: var(--text-secondary);
  font-size: 13px;
}

/* ============================================
   新闻卡片
   ============================================ */
.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  transition: transform 0.3s, border-color 0.3s;
  cursor: pointer;
}
.news-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
}
.news-meta {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 14px;
}
.news-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.5;
}
.news-excerpt {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

/* ============================================
   招聘
   ============================================ */
.job-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  transition: transform 0.2s, border-color 0.2s;
  cursor: pointer;
}
.job-card:hover {
  transform: translateX(4px);
  border-color: var(--border-strong);
}
.job-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 6px;
}
.job-meta {
  font-size: 13px;
  color: var(--text-secondary);
}
.job-arrow {
  color: var(--cyan-soft);
  font-size: 24px;
}

/* ============================================
   联系表单
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
}
.info-card {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  margin-bottom: 16px;
}
.info-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.2), rgba(168, 85, 247, 0.2));
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  font-size: 20px;
  flex-shrink: 0;
}
.info-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.info-value {
  color: var(--text-primary);
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 14px 16px;
  background: rgba(10, 15, 30, 0.7);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 15px;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.15);
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* ============================================
   动画
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 960px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px; left: 0; right: 0;
    background: rgba(5, 7, 15, 0.98);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 16px;
  }
  .nav-toggle { display: block; }

  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4, .stats, .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-2, .feature-row, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .feature-row.reverse { direction: ltr; }

  .hero { padding: 140px 0 80px; }
  .section { padding: 80px 0; }

  .timeline::before { left: 20px; }
  .timeline-item:nth-child(odd),
  .timeline-item:nth-child(even) {
    padding-left: 56px;
    padding-right: 0;
    text-align: left;
  }
  .timeline-dot { left: 20px; }
}

@media (max-width: 560px) {
  .grid-3, .grid-4, .stats, .footer-grid { grid-template-columns: 1fr; }
  .hero-panel { padding: 16px; }
  .stats { padding: 32px 20px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .job-card { flex-direction: column; align-items: flex-start; }
}