/* ============================================================
   FastForward 向前海外 — 官网主样式
   Brand Colors: #0066FF (科技蓝) + #FF6B00 (活力橙)
   ============================================================ */

/* ---------- CSS 变量体系 ---------- */
:root {
  --blue:        #0066FF;
  --orange:      #FF6B00;
  --dark-bg:     #0A0F1E;
  --dark-bg2:    #111827;
  --dark-card:   #1A2236;
  --light-bg:    #F5F8FF;
  --white:       #FFFFFF;
  --text-dark:   #1A1A2E;
  --text-muted:  #6B7280;
  --text-light:  rgba(255,255,255,0.75);
  --green:       #00C853;

  --grad-main:   linear-gradient(135deg, var(--blue) 0%, var(--orange) 100%);
  --grad-dark:   linear-gradient(135deg, #0A0F1E 0%, #1A1040 50%, #0D1B3E 100%);
  --grad-blue:   linear-gradient(135deg, #0066FF, #0044CC);
  --grad-text:   linear-gradient(135deg, #0066FF, #FF6B00);

  --radius-sm:   8px;
  --radius-md:   16px;
  --radius-lg:   24px;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.12);
  --shadow-blue: 0 8px 32px rgba(0,102,255,0.25);
  --transition:  all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width:   1200px;
  --nav-height:  72px;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
  background: var(--white);
  color: var(--text-dark);
  line-height: 1.6;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ---------- 工具类 ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section-pad { padding: 100px 0; }
.section-pad-sm { padding: 64px 0; }

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

.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--blue);
  background: rgba(0,102,255,0.08);
  border: 1px solid rgba(0,102,255,0.2);
  border-radius: 100px;
  padding: 4px 14px;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 17px;
  color: var(--text-muted);
  max-width: 560px;
  line-height: 1.7;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 100px;
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--orange);
  color: var(--white);
  box-shadow: 0 4px 20px rgba(255,107,0,0.35);
}
.btn-primary:hover {
  background: #e55f00;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(255,107,0,0.45);
}

.btn-outline {
  border: 2px solid rgba(255,255,255,0.5);
  color: var(--white);
}
.btn-outline:hover {
  border-color: var(--white);
  background: rgba(255,255,255,0.1);
  transform: translateY(-2px);
}

.btn-blue {
  background: var(--blue);
  color: var(--white);
  box-shadow: var(--shadow-blue);
}
.btn-blue:hover {
  background: #0052cc;
  transform: translateY(-2px);
}

/* ============================================================
   导航栏
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: var(--transition);
}

.nav.scrolled {
  background: rgba(10,15,30,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  box-shadow: 0 4px 30px rgba(0,0,0,0.3);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-logo img { height: 36px; width: auto; }
.nav-logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.nav-logo-text .en { font-size: 16px; font-weight: 800; color: var(--white); letter-spacing: -0.5px; }
.nav-logo-text .cn { font-size: 11px; color: rgba(255,255,255,0.5); letter-spacing: 1px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-links a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,0.75);
  transition: var(--transition);
}
.nav-links a:hover, .nav-links a.active {
  color: var(--white);
  background: rgba(255,255,255,0.08);
}

.nav-cta { margin-left: 8px; }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0; right: 0;
  background: rgba(10,15,30,0.96);
  backdrop-filter: blur(20px);
  padding: 20px 24px 32px;
  flex-direction: column;
  gap: 4px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  z-index: 999;
  transform: translateY(-20px);
  opacity: 0;
  transition: var(--transition);
}
.nav-mobile.open {
  display: flex;
  transform: translateY(0);
  opacity: 1;
}
.nav-mobile a {
  padding: 12px 16px;
  color: rgba(255,255,255,0.8);
  font-size: 15px;
  font-weight: 500;
  border-radius: 8px;
  transition: var(--transition);
}
.nav-mobile a:hover { color: var(--white); background: rgba(255,255,255,0.06); }

/* ============================================================
   页面 Hero（内页通用）
   ============================================================ */
.page-hero {
  background: var(--grad-dark);
  padding: 140px 0 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,102,255,0.15) 0%, transparent 70%);
  top: -200px; left: -100px;
  pointer-events: none;
}
.page-hero::after {
  content: '';
  position: absolute;
  width: 400px; height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,107,0,0.12) 0%, transparent 70%);
  bottom: -100px; right: -50px;
  pointer-events: none;
}
.page-hero h1 {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 900;
  color: var(--white);
  margin-bottom: 16px;
}
.page-hero p {
  font-size: 18px;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}
.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
  margin-bottom: 20px;
}
.breadcrumb a { color: rgba(255,255,255,0.6); transition: var(--transition); }
.breadcrumb a:hover { color: var(--white); }
.breadcrumb span { color: rgba(255,255,255,0.3); }

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: var(--dark-bg);
  color: var(--white);
  padding: 72px 0 0;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  padding-bottom: 64px;
}
.footer-brand {}
.footer-brand .logo-wrap { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.footer-brand img { height: 32px; }
.footer-brand .brand-name { font-size: 18px; font-weight: 800; }
.footer-brand p { font-size: 14px; color: var(--text-light); line-height: 1.7; margin-bottom: 24px; }
.social-links { display: flex; gap: 10px; }
.social-link {
  width: 36px; height: 36px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.12);
  display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,0.6);
  font-size: 14px;
  transition: var(--transition);
}
.social-link:hover { border-color: var(--blue); color: var(--blue); background: rgba(0,102,255,0.08); }

.footer-col h4 { font-size: 13px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: rgba(255,255,255,0.4); margin-bottom: 20px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul a { font-size: 14px; color: rgba(255,255,255,0.6); transition: var(--transition); }
.footer-col ul a:hover { color: var(--white); }

.footer-contact { display: flex; flex-direction: column; gap: 12px; }
.footer-contact-item { display: flex; align-items: flex-start; gap: 10px; }
.footer-contact-item .icon { font-size: 16px; margin-top: 2px; flex-shrink: 0; }
.footer-contact-item span { font-size: 14px; color: rgba(255,255,255,0.6); line-height: 1.5; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: rgba(255,255,255,0.3);
}

/* ============================================================
   卡片通用样式
   ============================================================ */
.card {
  background: var(--white);
  border-radius: var(--radius-md);
  border: 1px solid rgba(0,0,0,0.06);
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  overflow: hidden;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.14);
}

.card-dark {
  background: var(--dark-card);
  border: 1px solid rgba(255,255,255,0.06);
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}
.card-dark:hover {
  transform: translateY(-6px);
  border-color: rgba(0,102,255,0.3);
  box-shadow: 0 12px 40px rgba(0,102,255,0.15);
}

/* 彩色图标方块 */
.icon-box {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}
.icon-blue   { background: linear-gradient(135deg, #0066FF, #0044CC); }
.icon-orange { background: linear-gradient(135deg, #FF6B00, #FF9500); }
.icon-purple { background: linear-gradient(135deg, #7B2FBE, #9B4DCA); }
.icon-green  { background: linear-gradient(135deg, #00C853, #00A040); }
.icon-teal   { background: linear-gradient(135deg, #00BCD4, #0097A7); }
.icon-red    { background: linear-gradient(135deg, #FF3B30, #CC2E22); }

/* ============================================================
   CTA 区块（通用）
   ============================================================ */
.cta-section {
  background: var(--grad-main);
  padding: 50px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.cta-section h2 {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 900;
  color: var(--white);
  margin-bottom: 16px;
  position: relative;
}
.cta-section p {
  font-size: 18px;
  color: rgba(255,255,255,0.85);
  margin-bottom: 40px;
  position: relative;
}
.cta-btn-white {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 40px;
  background: var(--white);
  color: var(--blue);
  font-size: 16px;
  font-weight: 700;
  border-radius: 100px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
  transition: var(--transition);
  position: relative;
}
.cta-btn-white:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.25);
  color: var(--orange);
}

/* ============================================================
   数据统计条
   ============================================================ */
.stats-strip {
  background: var(--dark-bg2);
  padding: 48px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}
.stat-item {}
.stat-num {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 900;
  background: var(--grad-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label { font-size: 14px; color: rgba(255,255,255,0.5); }

/* ============================================================
   走马灯
   ============================================================ */
.marquee-wrap { overflow: hidden; }
.marquee-track {
  display: flex;
  gap: 40px;
  animation: marquee 25s linear infinite;
  width: max-content;
}
.marquee-track:hover { animation-play-state: paused; }
@keyframes marquee {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
.partner-logo-item {
  height: auto;
  min-height: 100px;
  display: flex; align-items: center; justify-content: center;
  padding: 20px 48px;
  background: var(--white);
  border-radius: 12px;
  border: 1px solid rgba(0,0,0,0.07);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  white-space: nowrap;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  flex-shrink: 0;
  transition: var(--transition);
}
.partner-logo-item:hover { border-color: var(--blue); color: var(--blue); }

/* ============================================================
   动画辅助类（配合 GSAP）
   ============================================================ */
.fade-up   { opacity: 0; transform: translateY(40px); }
.fade-left { opacity: 0; transform: translateX(-40px); }
.fade-right { opacity: 0; transform: translateX(40px); }
.scale-in  { opacity: 0; transform: scale(0.92); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid  { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links, .nav-cta { display: none; }
  .nav-hamburger { display: flex; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
  .section-pad { padding: 64px 0; }
}