/* ===== CSS变量 ===== */
:root {
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --primary-dark: #1d4ed8;
  --accent: #0ea5e9;
  --accent-teal: #0d9488;
  --accent-purple: #7c3aed;
  --accent-orange: #ea580c;
  --dark: #0f172a;
  --dark-2: #1e293b;
  --dark-3: #334155;
  --text: #334155;
  --text-light: #64748b;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --bg: #f8fafc;
  --white: #ffffff;
  --gradient: linear-gradient(135deg, #2563eb 0%, #0ea5e9 100%);
  --gradient-dark: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow: 0 4px 16px rgba(0,0,0,.08);
  --shadow-lg: 0 16px 48px rgba(0,0,0,.12);
  --shadow-blue: 0 8px 32px rgba(37,99,235,.2);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all .3s cubic-bezier(.4,0,.2,1);
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: 'Noto Sans SC', 'Inter', -apple-system, sans-serif; color: var(--text); background: var(--white); line-height: 1.6; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }

/* ===== 通用容器 ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; }
.gradient-text { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

/* ===== 按钮 ===== */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 28px; border-radius: 8px; font-size: 15px; font-weight: 600; transition: var(--transition); cursor: pointer; }
.btn-primary { background: var(--gradient); color: var(--white); box-shadow: var(--shadow-blue); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(37,99,235,.35); }
.btn-outline { background: transparent; color: var(--white); border: 1.5px solid rgba(255,255,255,.5); }
.btn-outline:hover { background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.8); }
.btn-white { background: var(--white); color: var(--primary); font-weight: 700; box-shadow: var(--shadow); }
.btn-white:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-outline-white { background: transparent; color: var(--white); border: 1.5px solid rgba(255,255,255,.6); }
.btn-outline-white:hover { background: rgba(255,255,255,.1); }
.btn-primary-sm { background: var(--gradient); color: var(--white); padding: 10px 20px; border-radius: 6px; font-size: 14px; font-weight: 600; display: inline-flex; align-items: center; transition: var(--transition); box-shadow: var(--shadow-blue); }
.btn-primary-sm:hover { transform: translateY(-1px); }

/* ===== 区块标题 ===== */
.section-header { text-align: center; max-width: 680px; margin: 0 auto 64px; }
.section-tag { display: inline-block; background: rgba(37,99,235,.08); color: var(--primary); font-size: 13px; font-weight: 600; padding: 5px 14px; border-radius: 100px; margin-bottom: 16px; letter-spacing: .5px; text-transform: uppercase; }
.section-title { font-size: clamp(24px, 3vw, 36px); font-weight: 700; color: var(--dark); line-height: 1.3; margin-bottom: 16px; }
.section-title.left { text-align: left; }
.section-desc { color: var(--text-light); font-size: 16px; line-height: 1.8; }

/* ===== 导航栏 ===== */
.navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; padding: 0; transition: var(--transition); }
.navbar.scrolled { background: rgba(255,255,255,.95); backdrop-filter: blur(20px); box-shadow: var(--shadow); }
.nav-container { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo-icon { width: 40px; height: 40px; flex-shrink: 0; }
.logo-text { display: flex; flex-direction: column; }
.logo-cn { font-size: 17px; font-weight: 700; color: var(--white); transition: var(--transition); letter-spacing: 1px; }
.navbar.scrolled .logo-cn { color: var(--dark); }
.logo-en { font-size: 11px; color: rgba(255,255,255,.7); letter-spacing: 1.5px; font-weight: 500; transition: var(--transition); }
.navbar.scrolled .logo-en { color: var(--text-muted); }
.nav-links { display: flex; align-items: center; gap: 8px; }
.nav-link { padding: 8px 16px; border-radius: 8px; font-size: 14px; font-weight: 500; color: rgba(255,255,255,.85); transition: var(--transition); }
.nav-link:hover, .nav-link.active { color: var(--white); background: rgba(255,255,255,.12); }
.navbar.scrolled .nav-link { color: var(--text); }
.navbar.scrolled .nav-link:hover, .navbar.scrolled .nav-link.active { color: var(--primary); background: rgba(37,99,235,.06); }
.hamburger { display: none; flex-direction: column; gap: 5px; padding: 6px; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--white); border-radius: 2px; transition: var(--transition); }
.navbar.scrolled .hamburger span { background: var(--dark); }
.mobile-menu { display: none; flex-direction: column; background: var(--white); border-top: 1px solid var(--border); padding: 8px 16px 16px; }
.mobile-menu.open { display: flex; }
.mobile-link { padding: 12px 16px; font-size: 15px; font-weight: 500; color: var(--text); border-radius: 8px; transition: var(--transition); }
.mobile-link:hover, .mobile-link.active { color: var(--primary); background: rgba(37,99,235,.06); }

/* ===== Hero ===== */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; background: var(--gradient-dark); overflow: hidden; padding-top: 72px; }
.hero-bg { position: absolute; inset: 0; overflow: hidden; }
.dna-bg { position: absolute; inset: 0; background: radial-gradient(ellipse 80% 60% at 60% 40%, rgba(37,99,235,.25) 0%, transparent 70%), radial-gradient(ellipse 50% 50% at 20% 70%, rgba(14,165,233,.15) 0%, transparent 60%); }
.hero-bg::before { content: ''; position: absolute; top: -40%; right: -20%; width: 700px; height: 700px; border-radius: 50%; background: radial-gradient(circle, rgba(37,99,235,.12) 0%, transparent 70%); }
.hero-bg::after { content: ''; position: absolute; bottom: -20%; left: 10%; width: 500px; height: 500px; border-radius: 50%; background: radial-gradient(circle, rgba(14,165,233,.1) 0%, transparent 70%); }
.hero-content { position: relative; z-index: 1; text-align: center; padding: 80px 0 100px; }
.hero-badge { display: inline-block; background: rgba(14,165,233,.15); border: 1px solid rgba(14,165,233,.3); color: #7dd3fc; font-size: 13px; font-weight: 600; padding: 6px 18px; border-radius: 100px; margin-bottom: 28px; letter-spacing: .5px; }
.hero-title { font-size: clamp(36px, 5vw, 64px); font-weight: 800; color: var(--white); line-height: 1.2; margin-bottom: 24px; letter-spacing: -1px; }
.hero-desc { font-size: clamp(15px, 1.5vw, 18px); color: rgba(255,255,255,.7); max-width: 640px; margin: 0 auto 40px; line-height: 1.8; }
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 64px; }
.hero-stats { display: flex; align-items: center; justify-content: center; gap: 40px; flex-wrap: wrap; }
.stat-item { text-align: center; }
.stat-num { font-size: 36px; font-weight: 800; color: var(--white); line-height: 1; }
.stat-label { font-size: 13px; color: rgba(255,255,255,.55); margin-top: 4px; }
.stat-divider { width: 1px; height: 48px; background: rgba(255,255,255,.15); }
.hero-scroll { position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%); }
.scroll-indicator { width: 28px; height: 44px; border: 1.5px solid rgba(255,255,255,.3); border-radius: 14px; display: flex; justify-content: center; align-items: flex-start; padding-top: 8px; }
.scroll-dot { width: 4px; height: 8px; background: rgba(255,255,255,.7); border-radius: 2px; animation: scrollAnim 2s infinite; }
@keyframes scrollAnim { 0%,100%{transform:translateY(0);opacity:1} 60%{transform:translateY(12px);opacity:0} }
.hide-mobile { display: inline; }

/* ===== 平台卡片 ===== */
.platforms-section { background: var(--bg); }
.platforms-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }
.platform-card { background: var(--white); border-radius: var(--radius-lg); padding: 32px; box-shadow: var(--shadow-sm); border: 1px solid var(--border); transition: var(--transition); }
.platform-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(37,99,235,.15); }
.platform-icon { width: 56px; height: 56px; border-radius: 14px; display: flex; align-items: center; justify-content: center; margin-bottom: 20px; }
.platform-icon svg { width: 26px; height: 26px; }
.platform-icon.blue { background: rgba(37,99,235,.1); color: var(--primary); }
.platform-icon.purple { background: rgba(124,58,237,.1); color: var(--accent-purple); }
.platform-icon.teal { background: rgba(13,148,136,.1); color: var(--accent-teal); }
.platform-icon.orange { background: rgba(234,88,12,.1); color: var(--accent-orange); }
.platform-card h3 { font-size: 18px; font-weight: 700; color: var(--dark); margin-bottom: 10px; }
.platform-card p { font-size: 14px; color: var(--text-light); line-height: 1.7; margin-bottom: 20px; }
.platform-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.platform-tags span { font-size: 12px; font-weight: 500; padding: 3px 10px; border-radius: 100px; background: var(--bg); color: var(--text-light); border: 1px solid var(--border); }

/* ===== 应用领域 ===== */
.app-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; grid-template-rows: auto; gap: 24px; }
.app-card { position: relative; border-radius: var(--radius-lg); overflow: hidden; min-height: 300px; cursor: pointer; }
.app-card:hover .app-bg { transform: scale(1.05); }
.app-card-large { grid-column: span 2; min-height: 360px; }
.app-bg { position: absolute; inset: 0; transition: transform .6s cubic-bezier(.4,0,.2,1); }
.science-bg { background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #1a56db 100%); }
.agri-bg { background: linear-gradient(135deg, #0f2a1a 0%, #166534 50%, #16a34a 100%); }
.health-bg { background: linear-gradient(135deg, #1a0f2a 0%, #4c1d95 50%, #7c3aed 100%); }
.app-card::after { content: ''; position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,.7) 0%, rgba(0,0,0,.2) 60%, transparent 100%); z-index: 1; }
.app-content { position: relative; z-index: 2; padding: 32px; display: flex; flex-direction: column; justify-content: flex-end; height: 100%; }
.app-icon { width: 48px; height: 48px; border-radius: 12px; background: rgba(255,255,255,.15); display: flex; align-items: center; justify-content: center; margin-bottom: 16px; backdrop-filter: blur(8px); }
.app-icon svg { width: 22px; height: 22px; color: white; }
.app-content h3 { font-size: 22px; font-weight: 700; color: white; margin-bottom: 8px; }
.app-content p { font-size: 14px; color: rgba(255,255,255,.8); line-height: 1.7; margin-bottom: 16px; }
.app-link { font-size: 14px; font-weight: 600; color: rgba(255,255,255,.9); display: inline-flex; align-items: center; gap: 6px; transition: var(--transition); }
.app-link:hover { gap: 10px; color: white; }

/* ===== 为什么选择 ===== */
.why-section { background: var(--white); }
.why-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.why-desc { color: var(--text-light); font-size: 15px; line-height: 1.8; margin-bottom: 32px; }
.why-list { display: flex; flex-direction: column; gap: 20px; }
.why-list li { display: flex; gap: 14px; align-items: flex-start; }
.why-dot { width: 8px; height: 8px; background: var(--gradient); border-radius: 50%; margin-top: 6px; flex-shrink: 0; }
.why-list strong { display: block; font-size: 15px; font-weight: 700; color: var(--dark); margin-bottom: 2px; }
.why-list span { font-size: 14px; color: var(--text-light); line-height: 1.6; }
.why-visual { position: relative; display: flex; align-items: center; justify-content: center; min-height: 400px; }
.dna-visual { position: relative; }
.dna-strand { display: flex; flex-direction: column; gap: 16px; padding: 40px; background: var(--bg); border-radius: 24px; }
.dna-pair { display: flex; align-items: center; justify-content: center; gap: 8px; animation: dnaPulse 3s ease-in-out infinite; animation-delay: var(--d); }
@keyframes dnaPulse { 0%,100%{opacity:.7;transform:scaleX(.9)} 50%{opacity:1;transform:scaleX(1)} }
.base-left, .base-right { height: 16px; border-radius: 8px; }
.base-left { width: clamp(40px, 6vw, 80px); }
.base-right { width: clamp(30px, 5vw, 60px); }
.blue-base { background: rgba(37,99,235,.6); }
.purple-base { background: rgba(124,58,237,.6); }
.teal-base { background: rgba(13,148,136,.6); }
.orange-base { background: rgba(234,88,12,.6); }
.float-card { position: absolute; background: var(--white); border-radius: 14px; padding: 14px 18px; box-shadow: var(--shadow-lg); display: flex; align-items: center; gap: 12px; border: 1px solid var(--border); }
.float-card-1 { top: 10%; right: -30px; animation: float1 4s ease-in-out infinite; }
.float-card-2 { bottom: 10%; left: -30px; animation: float2 4s ease-in-out infinite; }
@keyframes float1 { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-12px)} }
@keyframes float2 { 0%,100%{transform:translateY(0)} 50%{transform:translateY(10px)} }
.float-icon { font-size: 24px; }
.float-title { font-size: 12px; color: var(--text-muted); margin-bottom: 2px; }
.float-val { font-size: 15px; font-weight: 700; color: var(--dark); }

/* ===== CTA ===== */
.cta-section { background: var(--gradient-dark); padding: 96px 0; }
.cta-container { text-align: center; }
.cta-title { font-size: clamp(28px, 3vw, 42px); font-weight: 800; color: var(--white); margin-bottom: 16px; }
.cta-desc { font-size: 17px; color: rgba(255,255,255,.65); margin-bottom: 40px; }
.cta-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== 页脚 ===== */
.footer { background: var(--dark-2); padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand-desc { font-size: 14px; color: rgba(255,255,255,.5); line-height: 1.8; margin-top: 20px; }
.footer-col h4 { font-size: 14px; font-weight: 700; color: var(--white); margin-bottom: 20px; text-transform: uppercase; letter-spacing: .5px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: 14px; color: rgba(255,255,255,.5); transition: var(--transition); }
.footer-col a:hover { color: var(--accent); }
.footer-contact li { display: flex; align-items: center; gap: 8px; font-size: 14px; color: rgba(255,255,255,.5); }
.footer-contact svg { width: 16px; height: 16px; flex-shrink: 0; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.08); padding: 24px 0; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; }
.footer-bottom p { font-size: 13px; color: rgba(255,255,255,.35); }
.footer-bottom a { color: rgba(255,255,255,.5); transition: var(--transition); }
.footer-bottom a:hover { color: var(--accent); }

/* ===== 内页 Hero ===== */
.page-hero { background: var(--gradient-dark); padding: 140px 0 80px; text-align: center; }
.page-hero-tag { display: inline-block; background: rgba(14,165,233,.15); border: 1px solid rgba(14,165,233,.3); color: #7dd3fc; font-size: 13px; font-weight: 600; padding: 6px 18px; border-radius: 100px; margin-bottom: 20px; }
.page-hero h1 { font-size: clamp(32px, 4vw, 52px); font-weight: 800; color: var(--white); margin-bottom: 16px; }
.page-hero p { font-size: 17px; color: rgba(255,255,255,.65); max-width: 560px; margin: 0 auto; }

/* ===== 关于我们页 ===== */
.about-intro { padding: 96px 0; }
.about-intro-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: center; }
.about-intro-content .section-tag { display: block; width: fit-content; margin-bottom: 16px; }
.about-intro-content p { color: var(--text-light); font-size: 15px; line-height: 1.9; margin-bottom: 16px; }
.about-intro-visual { position: relative; }
.about-card-stack { position: relative; }
.about-main-card { background: var(--gradient); border-radius: var(--radius-lg); padding: 40px; color: white; }
.about-main-card h3 { font-size: 22px; font-weight: 700; margin-bottom: 12px; }
.about-main-card p { opacity: .85; font-size: 14px; line-height: 1.8; }
.about-sub-card { position: absolute; bottom: -24px; right: -24px; background: var(--white); border-radius: var(--radius); padding: 20px 24px; box-shadow: var(--shadow-lg); border: 1px solid var(--border); min-width: 200px; }
.about-sub-card .sub-num { font-size: 32px; font-weight: 800; color: var(--primary); line-height: 1; }
.about-sub-card .sub-label { font-size: 13px; color: var(--text-muted); margin-top: 4px; }
.milestones { background: var(--bg); padding: 96px 0; }
.timeline { position: relative; max-width: 800px; margin: 0 auto; }
.timeline::before { content: ''; position: absolute; left: 50%; top: 0; bottom: 0; width: 2px; background: linear-gradient(to bottom, var(--primary), var(--accent)); transform: translateX(-50%); }
.tl-item { display: flex; align-items: flex-start; gap: 32px; margin-bottom: 48px; }
.tl-item:nth-child(even) { flex-direction: row-reverse; }
.tl-content { flex: 1; background: var(--white); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow-sm); border: 1px solid var(--border); }
.tl-content h4 { font-size: 16px; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.tl-content p { font-size: 14px; color: var(--text-light); line-height: 1.7; }
.tl-year { flex-shrink: 0; width: 80px; text-align: center; padding-top: 12px; }
.tl-dot { width: 14px; height: 14px; background: var(--gradient); border-radius: 50%; margin: 0 auto 8px; }
.tl-year span { font-size: 14px; font-weight: 700; color: var(--primary); }
.mission-section { padding: 96px 0; }
.mission-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.mission-card { text-align: center; padding: 40px 28px; border-radius: var(--radius-lg); background: var(--bg); border: 1px solid var(--border); transition: var(--transition); }
.mission-card:hover { border-color: rgba(37,99,235,.2); box-shadow: var(--shadow); transform: translateY(-4px); }
.mission-icon { width: 64px; height: 64px; border-radius: 16px; margin: 0 auto 24px; display: flex; align-items: center; justify-content: center; }
.mission-icon svg { width: 28px; height: 28px; }
.mission-card h3 { font-size: 19px; font-weight: 700; color: var(--dark); margin-bottom: 12px; }
.mission-card p { font-size: 14px; color: var(--text-light); line-height: 1.8; }

/* ===== 服务页 ===== */
.services-section { padding: 96px 0; }
.service-tabs { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-bottom: 56px; }
.tab-btn { padding: 10px 22px; border-radius: 8px; font-size: 14px; font-weight: 600; color: var(--text-light); background: var(--bg); border: 1px solid var(--border); cursor: pointer; transition: var(--transition); }
.tab-btn.active, .tab-btn:hover { background: var(--primary); color: var(--white); border-color: var(--primary); }
.service-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 28px; }
.service-card { background: var(--white); border-radius: var(--radius-lg); padding: 32px; box-shadow: var(--shadow-sm); border: 1px solid var(--border); transition: var(--transition); }
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(37,99,235,.15); }
.svc-header { display: flex; align-items: flex-start; gap: 16px; margin-bottom: 20px; }
.svc-icon { width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.svc-icon svg { width: 24px; height: 24px; }
.svc-title h3 { font-size: 18px; font-weight: 700; color: var(--dark); margin-bottom: 4px; }
.svc-title p { font-size: 13px; color: var(--text-muted); }
.service-card > p { font-size: 14px; color: var(--text-light); line-height: 1.8; margin-bottom: 20px; }
.svc-features { display: flex; flex-direction: column; gap: 8px; margin-bottom: 24px; }
.svc-feat { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text); }
.svc-feat::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--primary); flex-shrink: 0; }
.process-section { background: var(--bg); padding: 96px 0; }
.process-steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 24px; position: relative; }
.process-steps::after { content: ''; position: absolute; top: 40px; left: 60px; right: 60px; height: 2px; background: linear-gradient(to right, var(--primary), var(--accent)); z-index: 0; }
.step-card { text-align: center; position: relative; z-index: 1; }
.step-num { width: 64px; height: 64px; border-radius: 50%; background: var(--gradient); color: white; font-size: 22px; font-weight: 800; display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; box-shadow: var(--shadow-blue); }
.step-card h4 { font-size: 15px; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.step-card p { font-size: 13px; color: var(--text-light); line-height: 1.7; }

/* ===== 联系页 ===== */
.contact-section { padding: 96px 0; }
.contact-grid { display: grid; grid-template-columns: 1fr 1.5fr; gap: 64px; align-items: start; }
.contact-info { display: flex; flex-direction: column; gap: 24px; }
.contact-card { background: var(--bg); border-radius: var(--radius); padding: 24px; border: 1px solid var(--border); display: flex; gap: 16px; align-items: flex-start; transition: var(--transition); }
.contact-card:hover { border-color: rgba(37,99,235,.2); box-shadow: var(--shadow); }
.c-icon { width: 44px; height: 44px; border-radius: 12px; background: rgba(37,99,235,.1); color: var(--primary); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.c-icon svg { width: 20px; height: 20px; }
.c-label { font-size: 12px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px; margin-bottom: 4px; }
.c-value { font-size: 15px; font-weight: 600; color: var(--dark); }
.c-sub { font-size: 13px; color: var(--text-muted); margin-top: 2px; }
.contact-form { background: var(--white); border-radius: var(--radius-lg); padding: 40px; box-shadow: var(--shadow); border: 1px solid var(--border); }
.contact-form h3 { font-size: 22px; font-weight: 700; color: var(--dark); margin-bottom: 28px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.form-group label { font-size: 13px; font-weight: 600; color: var(--text); }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 12px 16px; border: 1.5px solid var(--border); border-radius: 8px; font-size: 14px; font-family: inherit; color: var(--dark); background: var(--white); transition: var(--transition); }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.1); }
.form-group textarea { resize: vertical; min-height: 120px; }
.form-submit { width: 100%; padding: 14px; background: var(--gradient); color: white; font-size: 15px; font-weight: 700; border-radius: 8px; cursor: pointer; transition: var(--transition); border: none; }
.form-submit:hover { transform: translateY(-2px); box-shadow: var(--shadow-blue); }
.form-note { font-size: 12px; color: var(--text-muted); text-align: center; margin-top: 12px; }
.map-section { padding: 0 0 96px; }
.map-placeholder { background: var(--bg); border-radius: var(--radius-lg); height: 320px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; border: 2px dashed var(--border); }
.map-placeholder svg { width: 48px; height: 48px; color: var(--text-muted); }
.map-placeholder p { font-size: 15px; font-weight: 600; color: var(--text-light); }
.map-placeholder span { font-size: 13px; color: var(--text-muted); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .why-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-intro-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .app-grid { grid-template-columns: 1fr 1fr; }
  .app-card-large { grid-column: span 2; }
}
@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .hide-mobile { display: none; }
  .hero-stats { gap: 24px; }
  .app-grid { grid-template-columns: 1fr; }
  .app-card-large { grid-column: span 1; }
  .timeline::before { left: 20px; }
  .tl-item { flex-direction: column !important; padding-left: 52px; position: relative; gap: 0; }
  .tl-year { position: absolute; left: 0; top: 0; width: 40px; }
  .tl-dot { position: absolute; left: 3px; }
  .tl-content { margin-top: 28px; }
  .mission-grid { grid-template-columns: 1fr; }
  .service-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .process-steps::after { display: none; }
  .float-card { display: none; }
}
@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-title { font-size: 32px; }
  .stat-divider { display: none; }
  .hero-stats { gap: 16px; }
}