/* ========== 变量与基础 ========== */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --accent: #22d3ee;
  --accent-2: #a78bfa;
  --bg: #ffffff;
  --bg-dark: #0f172a;
  --bg-section: #f8fafc;
  --text: #1e293b;
  --text-light: #64748b;
  --text-lighter: #94a3b8;
  --border: #e2e8f0;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.12);
  --gradient: linear-gradient(135deg, #6366f1, #a78bfa, #22d3ee);
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%);
}

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

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== 通用按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 999px;
  cursor: pointer;
  border: none;
  transition: all 0.3s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(99, 102, 241, 0.45);
}
.btn-outline {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.4);
}
.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #fff;
}
.btn-white {
  background: #fff;
  color: var(--primary-dark);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}
.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.2);
}
.btn-block { width: 100%; }

/* ========== 导航栏 ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all 0.3s ease;
}
.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-sm);
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.35rem;
  font-weight: 800;
}
.logo-svg {
  display: block;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  filter: drop-shadow(0 2px 6px rgba(102,126,234,0.25));
}
.logo-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  white-space: nowrap;
}
.logo-dot {
  color: var(--text-lighter);
  -webkit-text-fill-color: var(--text-lighter);
  margin: 0 4px;
  font-weight: 400;
}
.logo-text-2 {
  background: linear-gradient(135deg, #0ea5e9, #06b6d4);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
.logo-img-jisi {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  display: block;
  border-radius: 50%;
  object-fit: cover;
}
.nav-menu {
  display: flex;
  gap: 36px;
}
.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-light);
  position: relative;
  transition: color 0.2s;
}
.nav-link::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient);
  transition: width 0.3s;
}
.nav-link:hover,
.nav-link.active {
  color: var(--primary-dark);
}
.nav-link.active::after,
.nav-link:hover::after {
  width: 100%;
}
.nav-lang {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 12px;
  font-size: 0.85rem;
}
.lang-link {
  color: var(--text-light);
  font-weight: 500;
  transition: color 0.2s;
  padding: 2px 4px;
}
.lang-link:hover,
.lang-link.active {
  color: var(--primary-dark);
}
.lang-sep {
  color: var(--border);
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  width: 24px;
  height: 2.5px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ========== Hero ========== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-hero);
  color: #fff;
  overflow: hidden;
  padding: 120px 24px 80px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  animation: float 12s ease-in-out infinite;
}
.blob-1 {
  width: 500px;
  height: 500px;
  background: #6366f1;
  top: -150px;
  left: -100px;
}
.blob-2 {
  width: 400px;
  height: 400px;
  background: #22d3ee;
  bottom: -100px;
  right: -80px;
  animation-delay: -6s;
}
@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, -30px) scale(1.1); }
}
.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 70%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 820px;
  text-align: center;
  animation: fadeUp 1s ease;
}
.hero-tag {
  display: inline-block;
  padding: 8px 20px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  font-size: 0.88rem;
  margin-bottom: 28px;
  backdrop-filter: blur(4px);
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
}
.gradient-text {
  background: linear-gradient(90deg, #a78bfa, #22d3ee, #4ade80);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  background-size: 200% auto;
  animation: shine 4s linear infinite;
}
@keyframes shine {
  to { background-position: 200% center; }
}
.hero-desc {
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  color: rgba(255, 255, 255, 0.75);
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 64px;
  flex-wrap: wrap;
}
.hero-stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  flex-wrap: wrap;
}
.h-stat { text-align: center; }
.h-num {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
}
.h-label {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 6px;
}
.scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  width: 26px;
  height: 42px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 14px;
}
.scroll-hint span {
  display: block;
  width: 4px;
  height: 8px;
  background: rgba(255, 255, 255, 0.6);
  border-radius: 2px;
  margin: 8px auto 0;
  animation: scrollDown 1.6s ease-in-out infinite;
}
@keyframes scrollDown {
  0% { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(14px); }
}

/* ========== 信任背书 ========== */
.trust-bar {
  padding: 48px 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.trust-title {
  text-align: center;
  color: var(--text-lighter);
  font-size: 0.9rem;
  margin-bottom: 28px;
  letter-spacing: 1px;
}
.trust-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 56px;
  flex-wrap: wrap;
}
.trust-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-lighter);
  opacity: 0.55;
  transition: opacity 0.3s;
  letter-spacing: 1px;
}
.trust-logo:hover { opacity: 1; color: var(--primary); }

/* ========== 通用 Section ========== */
.section {
  padding: 100px 0;
}
.section-alt {
  background: var(--bg-section);
}
.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}
.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(99, 102, 241, 0.1);
  color: var(--primary-dark);
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--text);
  margin-bottom: 16px;
  line-height: 1.3;
}
.section-desc {
  color: var(--text-light);
  font-size: 1.05rem;
}

/* ========== 关于我们 ========== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about-lead {
  font-size: 1.1rem;
  color: var(--text);
  margin-bottom: 16px;
  font-weight: 500;
}
.about-text p {
  color: var(--text-light);
  margin-bottom: 28px;
  line-height: 1.8;
}
.about-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.af-item {
  padding: 20px 16px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-align: center;
  transition: all 0.3s;
}
.af-item:hover {
  border-color: var(--primary-light);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.af-icon {
  font-size: 1.8rem;
  margin-bottom: 10px;
}
.af-item h4 {
  font-size: 0.95rem;
  margin-bottom: 6px;
}
.af-item p {
  font-size: 0.8rem;
  color: var(--text-lighter);
  margin: 0;
}

/* 关于视觉卡片 */
.about-visual {
  display: flex;
  justify-content: center;
}
.about-card {
  width: 100%;
  max-width: 440px;
  background: var(--bg-dark);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.ac-header {
  display: flex;
  gap: 8px;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.ac-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.ac-dot.red { background: #ef4444; }
.ac-dot.yellow { background: #f59e0b; }
.ac-dot.green { background: #22c55e; }
.ac-body {
  padding: 24px;
  color: #e2e8f0;
  font-size: 0.92rem;
}
.ac-line {
  padding: 10px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.08);
}
.ac-line:last-of-type { border-bottom: none; }
.ac-key {
  color: var(--accent);
  font-weight: 600;
  margin-right: 12px;
}
.ac-chart {
  display: flex;
  align-items: flex-end;
  justify-content: space-around;
  height: 140px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
}
.bar {
  width: 50px;
  height: var(--h);
  background: var(--gradient);
  border-radius: 6px 6px 0 0;
  position: relative;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 8px;
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  animation: barGrow 1.2s ease-out;
}
@keyframes barGrow {
  from { height: 0; }
}

/* ========== 核心服务 ========== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.service-card {
  background: #fff;
  padding: 36px 28px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s;
}
.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.service-card:hover::before {
  transform: scaleX(1);
}
.svc-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(99,102,241,0.12), rgba(34,211,238,0.12));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 20px;
}
.service-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}
.service-card > p {
  color: var(--text-light);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 20px;
}
.svc-list {
  margin-bottom: 24px;
}
.svc-list li {
  font-size: 0.88rem;
  color: var(--text-light);
  padding: 6px 0;
  padding-left: 22px;
  position: relative;
}
.svc-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
}
.svc-more {
  color: var(--primary-dark);
  font-weight: 600;
  font-size: 0.9rem;
  transition: gap 0.3s;
}
.svc-more:hover { gap: 8px; }

/* ========== 企业宗旨 ========== */
.philosophy {
  background: var(--gradient-hero);
  color: #fff;
  position: relative;
  overflow: hidden;
}
.philosophy::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient);
  opacity: 0.12;
}
.philosophy .container { position: relative; z-index: 1; }
.philosophy .section-title { color: #fff; }
.philosophy .section-tag {
  background: rgba(255, 255, 255, 0.12);
  color: #c7d2fe;
}
.philosophy .section-desc { color: #cbd5e1; }
.philosophy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  max-width: 900px;
  margin: 0 auto;
}
.philosophy-card {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius);
  padding: 44px 36px;
  text-align: center;
  backdrop-filter: blur(8px);
  transition: transform 0.3s, background 0.3s, border-color 0.3s;
}
.philosophy-card:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(165, 180, 252, 0.5);
}
.philosophy-icon {
  font-size: 2.4rem;
  margin-bottom: 16px;
}
.philosophy-card h3 {
  font-size: 1.25rem;
  margin-bottom: 18px;
  color: #e0e7ff;
  position: relative;
  display: inline-block;
}
.philosophy-card h3::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -8px;
  transform: translateX(-50%);
  width: 36px;
  height: 2px;
  background: var(--gradient);
  border-radius: 2px;
}
.philosophy-card p {
  color: #f1f5f9;
  font-size: 1.08rem;
  line-height: 1.9;
  font-weight: 500;
}

/* ========== 数据统计 ========== */
.stats-section {
  background: var(--bg-dark);
  padding: 80px 0;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.stats-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient);
  opacity: 0.08;
}
.stats-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}
.stat-card {
  text-align: center;
}
.stat-num {
  font-size: clamp(2.2rem, 4vw, 3rem);
  font-weight: 800;
  background: linear-gradient(90deg, #a78bfa, #22d3ee);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
}
.stat-text {
  color: rgba(255, 255, 255, 0.6);
  margin-top: 10px;
  font-size: 0.95rem;
}

/* ========== 客户案例 ========== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}
.case-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all 0.35s;
}
.case-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.case-img {
  height: 180px;
  background: var(--bg);
  background-image: var(--bg);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.case-industry {
  padding: 6px 16px;
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(4px);
  border-radius: 999px;
  color: #fff;
  font-weight: 600;
  font-size: 0.85rem;
}
.case-body {
  padding: 24px;
}
.case-body h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}
.case-body p {
  color: var(--text-light);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 16px;
}
.case-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.case-tags span {
  padding: 4px 12px;
  background: rgba(99, 102, 241, 0.08);
  color: var(--primary-dark);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
}

/* ========== 团队 ========== */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
}
.team-card {
  background: #fff;
  padding: 32px 24px;
  border-radius: var(--radius);
  text-align: center;
  border: 1px solid var(--border);
  transition: all 0.35s;
}
.team-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.team-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: var(--bg);
  background-image: var(--bg);
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}
.team-card h3 {
  font-size: 1.15rem;
  margin-bottom: 4px;
}
.team-role {
  color: var(--primary-dark);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 12px;
}
.team-bio {
  color: var(--text-light);
  font-size: 0.85rem;
  line-height: 1.7;
}

/* ========== 客户评价 ========== */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
}
.testimonial-card {
  background: #fff;
  padding: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  position: relative;
  transition: all 0.35s;
}
.testimonial-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.quote {
  font-size: 4rem;
  font-family: Georgia, serif;
  color: var(--primary-light);
  opacity: 0.3;
  line-height: 0.6;
  margin-bottom: 16px;
}
.testimonial-card > p {
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 24px;
}
.t-author {
  display: flex;
  align-items: center;
  gap: 14px;
}
.t-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg);
  background-image: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
}
.t-name {
  font-weight: 600;
  font-size: 0.95rem;
}
.t-company {
  font-size: 0.82rem;
  color: var(--text-lighter);
}

/* ========== 联系我们 ========== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 56px;
  align-items: start;
  max-width: 900px;
  margin: 0 auto;
}
.contact-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.info-item {
  display: flex;
  gap: 18px;
  padding: 20px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all 0.3s;
}
.info-item:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-sm);
}
.info-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(99,102,241,0.12), rgba(34,211,238,0.12));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}
.info-item h4 {
  font-size: 0.95rem;
  margin-bottom: 4px;
}
.contact-hours {
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--text-light);
  margin-left: 2px;
}
.info-item p {
  color: var(--text-light);
  font-size: 0.88rem;
}

.contact-form {
  background: #fff;
  padding: 36px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.92rem;
  font-family: inherit;
  transition: all 0.2s;
  background: #fafafa;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}
.form-group textarea { resize: vertical; }
.form-tip {
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-lighter);
  margin-top: 16px;
}

/* ========== CTA 横幅 ========== */
.cta-banner {
  background: var(--gradient);
  padding: 72px 0;
  color: #fff;
}
.cta-inner {
  text-align: center;
}
.cta-inner h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 12px;
}
.cta-inner p {
  font-size: 1.05rem;
  opacity: 0.9;
  margin-bottom: 28px;
}

/* ========== 页脚 ========== */
.footer {
  background: var(--bg-dark);
  color: #cbd5e1;
  padding: 64px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand .logo-text {
  color: #fff;
  -webkit-text-fill-color: #fff;
}
.footer-brand .logo-dot {
  color: rgba(255, 255, 255, 0.4);
  -webkit-text-fill-color: rgba(255, 255, 255, 0.4);
}
.footer-brand .logo-text-2 {
  background: linear-gradient(135deg, #67e8f9, #22d3ee);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
.footer-brand .logo-img-jisi {
  width: 34px;
  height: 34px;
}
.footer-brand p {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
  margin: 16px 0 20px;
  line-height: 1.7;
}
.footer-philosophy {
  position: relative;
  margin: 0 0 22px;
  padding: 16px 18px 16px 20px;
  border-left: 3px solid var(--primary-light);
  background: rgba(255, 255, 255, 0.04);
  border-radius: 0 10px 10px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.fp-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}
.fp-label {
  flex-shrink: 0;
  font-size: 0.78rem;
  font-weight: 700;
  color: #a5b4fc;
  background: rgba(99, 102, 241, 0.15);
  padding: 2px 10px;
  border-radius: 20px;
  white-space: nowrap;
}
.fp-text {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.85rem;
  line-height: 1.6;
}
.socials {
  display: flex;
  gap: 12px;
}
.socials a {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all 0.3s;
}
.socials a:hover {
  background: var(--gradient);
  transform: translateY(-2px);
}
.footer-col h4 {
  color: #fff;
  font-size: 0.95rem;
  margin-bottom: 20px;
}
.footer-col a {
  display: block;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.88rem;
  padding: 6px 0;
  transition: color 0.2s;
}
.footer-col a:hover {
  color: var(--accent);
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.4);
}
.footer-links {
  display: flex;
  gap: 24px;
}
.footer-links a:hover { color: #fff; }

/* ========== 回到顶部 ========== */
.back-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all 0.3s;
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
  z-index: 999;
}
.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-top:hover { transform: translateY(-3px); }

/* ========== 滚动动画 ========== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ========== 响应式 ========== */
@media (max-width: 900px) {
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }
  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: #fff;
    padding: 24px;
    gap: 20px;
    box-shadow: var(--shadow);
    transform: translateY(-120%);
    transition: transform 0.3s ease;
    border-top: 1px solid var(--border);
  }
  .nav-menu.active {
    transform: translateY(0);
  }
  .nav-toggle { display: flex; }
  .nav-lang { margin-left: 0; margin-right: 8px; font-size: 0.8rem; }
  .logo { font-size: 1.05rem; gap: 6px; }
  .logo-svg { width: 30px; height: 30px; }
  .logo-img-jisi { width: 26px; height: 26px; }
  .hero { padding-top: 100px; min-height: auto; padding-bottom: 60px; }
  .hero-stats { gap: 32px; }
  .about-features { grid-template-columns: 1fr; }
  .contact-info { grid-template-columns: 1fr; }
  .philosophy-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .footer-links { justify-content: center; }
  .hero-actions { flex-direction: column; align-items: center; }
  .hero-actions .btn { width: 100%; max-width: 280px; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .contact-form { padding: 24px; }
  .hero-stats { gap: 20px; }
  .logo { font-size: 0.92rem; }
  .logo-dot { margin: 0 2px; }
  .logo-img-jisi { width: 22px; height: 22px; }
}