/* ===== 星投数字营销 - 全局样式 ===== */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #0ea5e9;
  --accent: #f59e0b;
  --dark: #0f172a;
  --dark-2: #1e293b;
  --dark-3: #334155;
  --gray: #64748b;
  --light: #f8fafc;
  --white: #ffffff;
  --success: #10b981;
  --gradient: linear-gradient(135deg, #6366f1 0%, #0ea5e9 50%, #8b5cf6 100%);
  --gradient-soft: linear-gradient(135deg, rgba(99,102,241,0.15) 0%, rgba(14,165,233,0.1) 100%);
  --shadow: 0 10px 40px -10px rgba(99, 102, 241, 0.3);
  --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--dark);
  color: var(--light);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

img {
  max-width: 100%;
  height: auto;
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(15, 23, 42, 0.95);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.logo span {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--gray);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--white);
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient);
  border-radius: 2px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background: var(--gradient);
  color: var(--white);
  box-shadow: var(--shadow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 40px -10px rgba(99, 102, 241, 0.5);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 1.5px solid rgba(255, 255, 255, 0.2);
}

.btn-outline:hover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
}

/* 移动端菜单 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== Hero ===== */
.hero {
  padding: 160px 0 100px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.25) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -10%;
  left: -5%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(14, 165, 233, 0.2) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--primary-light);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
}

.hero h1 .gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  color: var(--gray);
  max-width: 520px;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  padding-top: 36px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.stat-item h3 {
  font-size: 1.8rem;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-item p {
  font-size: 0.9rem;
  color: var(--gray);
  margin: 0;
}

.hero-visual {
  position: relative;
}

.platform-cards {
  display: grid;
  gap: 16px;
}

.platform-card {
  background: rgba(30, 41, 59, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.platform-card:hover {
  transform: translateX(8px);
  border-color: rgba(99, 102, 241, 0.4);
  box-shadow: var(--shadow);
}

.platform-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  flex-shrink: 0;
}

.platform-icon.meta {
  background: linear-gradient(135deg, #1877f2, #0a5ad4);
}

.platform-icon.google {
  background: linear-gradient(135deg, #ea4335, #fbbc05, #34a853, #4285f4);
}

.platform-icon.tiktok {
  background: linear-gradient(135deg, #000000, #25f4ee, #fe2c55);
}

.platform-info h4 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.platform-info p {
  font-size: 0.85rem;
  color: var(--gray);
  margin: 0;
}

/* ===== 通用区块 ===== */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 60px;
}

.section-header .label {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary-light);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.8px;
  margin-bottom: 16px;
}

.section-header p {
  color: var(--gray);
  font-size: 1.05rem;
}

/* ===== 服务 ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.service-card {
  background: var(--dark-2);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient);
  opacity: 0;
  transition: var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: var(--shadow-lg);
}

.service-card:hover::before {
  opacity: 1;
}

.service-icon {
  width: 56px;
  height: 56px;
  background: var(--gradient-soft);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 24px;
}

.service-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.service-card p {
  color: var(--gray);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

.service-card ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.service-card li {
  font-size: 0.9rem;
  color: var(--light);
  display: flex;
  align-items: center;
  gap: 8px;
}

.service-card li::before {
  content: "✓";
  color: var(--success);
  font-weight: 700;
  font-size: 0.85rem;
}

/* ===== 优势 ===== */
.advantages {
  background: var(--dark-2);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.advantage-item {
  text-align: center;
  padding: 32px 20px;
  border-radius: var(--radius);
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: var(--transition);
}

.advantage-item:hover {
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-4px);
}

.advantage-num {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.advantage-item h4 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.advantage-item p {
  font-size: 0.9rem;
  color: var(--gray);
}

/* ===== CTA ===== */
.cta-section {
  padding: 80px 0;
}

.cta-box {
  background: var(--gradient);
  border-radius: var(--radius-lg);
  padding: 60px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
}

.cta-box h2 {
  font-size: 2.2rem;
  margin-bottom: 16px;
  position: relative;
}

.cta-box p {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 32px;
  position: relative;
}

.cta-box .btn {
  background: var(--white);
  color: var(--primary-dark);
  position: relative;
}

.cta-box .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

/* ===== Footer ===== */
.footer {
  background: var(--dark-2);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--gray);
  margin-top: 16px;
  font-size: 0.95rem;
  max-width: 280px;
}

.footer h4 {
  font-size: 1rem;
  margin-bottom: 20px;
  color: var(--white);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: var(--gray);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--primary-light);
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--gray);
}

/* ===== 联系页面 ===== */
.page-hero {
  padding: 140px 0 60px;
  text-align: center;
}

.page-hero h1 {
  font-size: 2.8rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.page-hero p {
  color: var(--gray);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 100px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.info-card {
  background: var(--dark-2);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  transition: var(--transition);
}

.info-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
}

.info-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-soft);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.info-card h4 {
  margin-bottom: 6px;
  font-size: 1.05rem;
}

.info-card p,
.info-card a {
  color: var(--gray);
  font-size: 0.95rem;
}

.info-card a:hover {
  color: var(--primary-light);
}

.contact-form-wrap {
  background: var(--dark-2);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.contact-form-wrap h3 {
  font-size: 1.4rem;
  margin-bottom: 8px;
}

.contact-form-wrap > p {
  color: var(--gray);
  margin-bottom: 28px;
  font-size: 0.95rem;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--light);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--dark);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  color: var(--white);
  font-size: 0.95rem;
  font-family: inherit;
  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(99, 102, 241, 0.2);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* ===== 隐私协议 ===== */
.privacy-content {
  max-width: 800px;
  margin: 0 auto;
  padding-bottom: 100px;
}

.privacy-content h2 {
  font-size: 1.5rem;
  margin: 36px 0 16px;
  color: var(--white);
}

.privacy-content h2:first-of-type {
  margin-top: 0;
}

.privacy-content p,
.privacy-content li {
  color: var(--gray);
  font-size: 0.98rem;
  margin-bottom: 12px;
  line-height: 1.75;
}

.privacy-content ul {
  margin: 12px 0 20px 20px;
}

.privacy-content li {
  list-style: disc;
  margin-bottom: 8px;
}

.privacy-content strong {
  color: var(--light);
}

.update-date {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(99, 102, 241, 0.15);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--primary-light);
  margin-bottom: 32px;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .hero h1 {
    font-size: 2.6rem;
  }

  .services-grid {
    grid-template-columns: 1fr 1fr;
  }

  .advantages-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--dark-2);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .nav-links.open {
    display: flex;
  }

  .menu-toggle {
    display: flex;
  }

  .hero {
    padding: 130px 0 70px;
  }

  .hero h1 {
    font-size: 2.1rem;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 24px;
  }

  .services-grid {
    grid-template-columns: 1fr;
  }

  .advantages-grid {
    grid-template-columns: 1fr;
  }

  .section-header h2 {
    font-size: 1.9rem;
  }

  .cta-box {
    padding: 40px 24px;
  }

  .cta-box h2 {
    font-size: 1.7rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .page-hero h1 {
    font-size: 2.2rem;
  }
}