/* ===== Variables ===== */
:root {
  --color-primary: #0ea5e9;
  --color-primary-dark: #0284c7;
  --color-primary-light: #38bdf8;
  --color-accent: #06b6d4;
  --color-bg: #0f172a;
  --color-bg-light: #1e293b;
  --color-bg-card: #1e293b;
  --color-text: #f1f5f9;
  --color-text-muted: #94a3b8;
  --color-border: rgba(148, 163, 184, 0.15);
  --gradient-primary: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 50%, #0891b2 100%);
  --gradient-hero: linear-gradient(180deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(14, 165, 233, 0.15);
  --radius: 12px;
  --radius-lg: 20px;
  --header-height: 72px;
  --font-cn: 'Noto Sans TC', sans-serif;
  --font-en: 'Inter', sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-cn);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

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

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

.header.scrolled {
  background: rgba(15, 23, 42, 0.95);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.logo-icon svg {
  width: 100%;
  height: 100%;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-cn {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
}

.logo-en {
  font-size: 10px;
  font-family: var(--font-en);
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.5px;
}

.nav-list {
  display: flex;
  gap: 8px;
}

.nav-link {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: 8px;
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary-light);
  background: rgba(14, 165, 233, 0.1);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

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

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 600;
  font-family: var(--font-cn);
  border-radius: 10px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(14, 165, 233, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(14, 165, 233, 0.45);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-light);
  background: rgba(14, 165, 233, 0.08);
}

.btn-full {
  width: 100%;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-height) + 60px) 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(14, 165, 233, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14, 165, 233, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black, transparent);
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
}

.hero-orb-1 {
  width: 500px;
  height: 500px;
  background: var(--color-primary);
  top: -100px;
  right: -100px;
  animation: float 8s ease-in-out infinite;
}

.hero-orb-2 {
  width: 400px;
  height: 400px;
  background: var(--color-accent);
  bottom: -50px;
  left: -100px;
  animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(30px, -30px); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  font-size: 12px;
  font-family: var(--font-en);
  font-weight: 600;
  letter-spacing: 1.5px;
  color: var(--color-primary-light);
  background: rgba(14, 165, 233, 0.12);
  border: 1px solid rgba(14, 165, 233, 0.25);
  border-radius: 100px;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
}

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

.hero-desc {
  font-size: 18px;
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto 36px;
}

.hero-actions {
  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;
  padding: 32px 48px;
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  max-width: 640px;
  margin: 0 auto;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 36px;
  font-weight: 700;
  font-family: var(--font-en);
  color: var(--color-primary-light);
}

.stat-suffix {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-primary-light);
}

.stat-label {
  display: block;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 48px;
  background: var(--color-border);
}

/* ===== Sections ===== */
.section {
  padding: 100px 0;
}

.section-header {
  margin-bottom: 56px;
}

.section-header.center {
  text-align: center;
}

.section-tag {
  display: inline-block;
  font-size: 12px;
  font-family: var(--font-en);
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.3;
}

.section-title .highlight {
  color: var(--color-primary-light);
}

.section-desc {
  font-size: 16px;
  color: var(--color-text-muted);
  margin-top: 16px;
  max-width: 560px;
}

.section-header.center .section-desc {
  margin-left: auto;
  margin-right: auto;
}

/* ===== About ===== */
.about {
  background: var(--color-bg-light);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-lead {
  font-size: 18px;
  color: var(--color-text);
  margin-bottom: 16px;
}

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

.about-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.about-card {
  padding: 28px 20px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-align: center;
  transition: var(--transition);
}

.about-card:hover {
  border-color: rgba(14, 165, 233, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.about-card-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto 12px;
  color: var(--color-primary);
}

.about-card-icon svg {
  width: 100%;
  height: 100%;
}

.about-card-num {
  display: block;
  font-size: 28px;
  font-weight: 700;
  font-family: var(--font-en);
  color: var(--color-primary-light);
}

.about-card-label {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ===== Services ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

.service-card {
  padding: 32px 24px;
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-align: center;
  transition: var(--transition);
}

.service-card:hover {
  border-color: rgba(14, 165, 233, 0.35);
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
}

.service-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 20px;
  padding: 12px;
  background: rgba(14, 165, 233, 0.1);
  border-radius: 12px;
  color: var(--color-primary);
}

.service-icon svg {
  width: 100%;
  height: 100%;
}

.service-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.service-card p {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ===== Ad Services ===== */
.ad-services {
  background: var(--color-bg-light);
}

.ad-services-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.ad-services-desc {
  font-size: 17px;
  color: var(--color-text);
  margin-bottom: 12px;
}

.ad-services-content p {
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.ad-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ad-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  color: var(--color-text);
}

.ad-features svg {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.platforms {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.platform-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 32px 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.platform-card:hover {
  border-color: rgba(14, 165, 233, 0.4);
  transform: scale(1.03);
}

.platform-logo {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  font-size: 24px;
  font-weight: 700;
  font-family: var(--font-en);
  color: #fff;
}

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

.platform-logo.facebook {
  background: #1877f2;
  font-size: 28px;
}

.platform-logo.tiktok {
  background: #000;
  padding: 12px;
}

.platform-logo.tiktok svg {
  width: 100%;
  height: 100%;
  color: #fff;
}

.platform-logo.kwai {
  background: linear-gradient(135deg, #ff6600, #ff3300);
}

.platform-card span {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-muted);
}

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

.advantage-card {
  padding: 36px 28px;
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

.advantage-card:hover {
  border-color: rgba(14, 165, 233, 0.3);
  transform: translateY(-4px);
}

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

.advantage-num {
  font-size: 40px;
  font-weight: 700;
  font-family: var(--font-en);
  color: rgba(14, 165, 233, 0.15);
  line-height: 1;
  margin-bottom: 16px;
}

.advantage-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
}

.advantage-card p {
  font-size: 14px;
  color: var(--color-text-muted);
}

/* ===== Contact ===== */
.contact {
  background: var(--color-bg-light);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact-desc {
  color: var(--color-text-muted);
  margin: 16px 0 32px;
}

.contact-items {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-item {
  display: flex;
  gap: 16px;
}

.contact-item-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(14, 165, 233, 0.1);
  border-radius: 12px;
  color: var(--color-primary);
}

.contact-item-icon svg {
  width: 22px;
  height: 22px;
}

.contact-item h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}

.contact-item p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.contact-form {
  padding: 40px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

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

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--color-text-muted);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  font-size: 15px;
  font-family: var(--font-cn);
  color: var(--color-text);
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  outline: none;
  transition: var(--transition);
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(148, 163, 184, 0.5);
}

.form-success {
  display: none;
  margin-top: 16px;
  padding: 12px;
  font-size: 14px;
  text-align: center;
  color: #34d399;
  background: rgba(52, 211, 153, 0.1);
  border-radius: 8px;
}

.form-success.show {
  display: block;
}

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 48px;
  padding: 64px 24px 48px;
}

.footer-logo {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 16px;
}

.footer-logo .logo-cn {
  font-size: 18px;
  font-weight: 600;
}

.footer-logo .logo-en {
  font-size: 11px;
  font-family: var(--font-en);
  color: var(--color-text-muted);
  letter-spacing: 0.5px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--color-text-muted);
  max-width: 360px;
}

.footer-links h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 14px;
  color: var(--color-text-muted);
  transition: var(--transition);
}

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

.footer-bottom {
  padding: 20px 0;
  border-top: 1px solid var(--color-border);
}

.footer-bottom p {
  font-size: 13px;
  color: var(--color-text-muted);
  text-align: center;
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-grid,
  .ad-services-inner,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
}

@media (max-width: 768px) {
  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.98);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 24px;
    transform: translateY(-120%);
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
  }

  .nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    gap: 4px;
  }

  .nav-link {
    display: block;
    padding: 12px 16px;
  }

  .menu-toggle {
    display: flex;
  }

  .hero-stats {
    flex-direction: column;
    gap: 24px;
    padding: 24px 32px;
  }

  .stat-divider {
    width: 48px;
    height: 1px;
  }

  .about-cards {
    grid-template-columns: 1fr;
  }

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

  .platforms {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .contact-form {
    padding: 28px 20px;
  }

  .section {
    padding: 72px 0;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

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