/* ============================================
   SYSSCI 式赛科技 — 官网样式
   ============================================ */


/* --- Design Tokens --- */
:root {
  /* 主色 */
  --color-black: #0B1120;
  --color-dark: #1A1F35;
  --color-white: #ffffff;
  --color-grey: #64748B;
  --color-grey-light: #94A3B8;
  --color-grey-lighter: #F1F5F9;
  --color-grey-border: rgba(51, 65, 85, 0.12);
  --color-border-light: rgba(15, 23, 42, 0.07);

  /* 强调色 */
  --color-blue: #2563EB;
  --color-blue-light: #60A5FA;
  --color-blue-link: #93C5FD;
  --color-accent: #10B981;
  --gradient-primary: linear-gradient(135deg, #2563EB 0%, #0EA5E9 100%);
  --gradient-card: linear-gradient(160deg, #162032 0%, #0B1120 100%);

  /* 字体 */
  --font-primary: system-ui, -apple-system, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --font-size-base: 16px;

  /* 间距 */
  --container-max: 1300px;
  --container-padding: 24px;
  --navbar-height: 72px;
  --section-padding: 96px;

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  /* 过渡 */
  --transition: 0.25s ease;
}

/* --- Reset --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: var(--font-size-base); scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font-primary); color: var(--color-dark); background: var(--color-white); overflow-x: hidden; line-height: 1.6; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* --- Layout --- */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--container-padding); }

/* --- Hero 背景图 --- */
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-color: var(--color-black);
}

.hero-bg img {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0.25;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.12; color: var(--color-dark); letter-spacing: -0.025em; }
h1 { font-size: clamp(2.5rem, 5vw, 3.75rem); font-weight: 700; }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.375rem); }
h3 { font-size: clamp(1.125rem, 2vw, 1.375rem); font-weight: 600; }

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-grey-light);
  margin-bottom: 14px;
}

.section-desc {
  color: var(--color-grey);
  font-size: 1.125rem;
  line-height: 1.7;
  max-width: 640px;
}

.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* Utility classes */
.relative { position: relative; }
.z-10 { z-index: 10; }

/* --- Buttons (Bitmovin style: 4px radius, font-weight 600) --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0.65rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 4px;
  transition: all var(--transition);
  position: relative;
  overflow: visible;
  white-space: nowrap;
}

.btn::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: 4px;
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

/* 蓝色实心按钮 */
.btn-blue {
  background: var(--color-blue);
  color: var(--color-white);
}
.btn-blue:hover {
  background: #0058c4;
}

/* 渐变按钮 */
.btn-gradient {
  background-image: var(--gradient-primary);
  color: var(--color-white);
}
.btn-gradient:hover { opacity: 0.9; }

/* 渐变边框按钮 (Bitmovin exact copy) */
.btn.btn-border-gradient {
  color: var(--color-white);
  border: 2px solid transparent;
  background: linear-gradient(rgb(13, 10, 16), rgb(13, 10, 16)) padding-box padding-box,
              linear-gradient(128deg, #1E40AF 0.55%, #06B6D4 98.63%) border-box border-box;
}

.btn.btn-border-gradient span {
  position: relative;
  z-index: 10;
}

.btn.btn-border-gradient:hover::after {
  background: linear-gradient(rgb(13, 10, 16), rgb(13, 10, 16)) padding-box padding-box,
              linear-gradient(128deg, #0EA5E9 0.55%, #10B981 98.63%) border-box border-box;
  border: 2px solid transparent;
  opacity: 1;
}

/* 二级按钮（蓝色边框） */
.btn-secondary {
  border: 1px solid var(--color-blue);
  color: var(--color-blue);
  background: transparent;
}
.btn-secondary:hover {
  background: rgba(0, 106, 237, 0.05);
}

/* 灰色边框按钮 */
.btn-secondary-grey {
  border: 1px solid var(--color-grey-border);
  color: var(--color-dark);
  background: transparent;
}
.btn-secondary-grey:hover {
  border-color: rgba(80, 95, 121, 0.15);
}

/* Ghost 按钮 (白色边框) */
.btn-ghost {
  color: var(--color-white);
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0);
  border-color: rgb(243 243 249 / var(--tw-border-opacity));
}
.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0);
}

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--navbar-height);
  z-index: 9999;
  background: transparent;
  transition: all var(--transition);
}

.navbar.scrolled {
  background: var(--color-white);
  box-shadow: 0 1px 0 var(--color-border-light);
}

/* 导航文字颜色切换 */
.navbar .nav-link { color: rgba(255, 255, 255, 0.85); }
.navbar .nav-link:hover { color: var(--color-white); }
.navbar.scrolled .nav-link { color: var(--color-grey); }
.navbar.scrolled .nav-link:hover { color: var(--color-blue); }
.navbar.scrolled .navbar-logo { color: var(--color-black); }
.navbar.scrolled .navbar-logo svg path,
.navbar.scrolled .navbar-logo svg text { fill: var(--color-dark); transition: fill var(--transition); }
.navbar.scrolled .btn-ghost {
  color: var(--color-dark);
  border-color: rgba(0, 0, 0, 0.15);
}
.navbar.scrolled .btn-ghost:hover {
  border-color: rgba(0, 0, 0, 0.25);
  background: rgba(0, 0, 0, 0.03);
}
.navbar.scrolled .btn.btn-border-gradient {
  color: var(--color-white);
  border: 2px solid transparent;
  background: linear-gradient(rgb(13, 10, 16), rgb(13, 10, 16)) padding-box padding-box,
              linear-gradient(128deg, #1E40AF 0.55%, #06B6D4 98.63%) border-box border-box;
}

.navbar.scrolled .btn.btn-border-gradient:hover::after {
  background: linear-gradient(rgb(13, 10, 16), rgb(13, 10, 16)) padding-box padding-box,
              linear-gradient(128deg, #0EA5E9 0.55%, #10B981 98.63%) border-box border-box;
  border: 2px solid transparent;
  opacity: 1;
}

/* 当前页导航高亮 */
.navbar .nav-link.nav-active { color: var(--color-white); }
.navbar.scrolled .nav-link.nav-active { color: var(--color-blue); }

/* 子页面默认 scrolled 状态（非深色 hero 页面） */
.navbar.force-scrolled {
  background: var(--color-white);
  box-shadow: 0 1px 0 var(--color-border-light);
}
.navbar.force-scrolled .nav-link { color: var(--color-grey); }
.navbar.force-scrolled .nav-link:hover { color: var(--color-blue); }
.navbar.force-scrolled .nav-link.nav-active { color: var(--color-blue); }
.navbar.force-scrolled .navbar-logo { color: var(--color-black); }
.navbar.force-scrolled .navbar-logo svg path,
.navbar.force-scrolled .navbar-logo svg text { fill: var(--color-dark); }
.navbar.force-scrolled .btn-ghost {
  color: var(--color-dark);
  border-color: rgba(0, 0, 0, 0.15);
}
.navbar.force-scrolled .btn-ghost:hover {
  border-color: rgba(0, 0, 0, 0.25);
  background: rgba(0, 0, 0, 0.03);
}
.navbar.force-scrolled .btn.btn-border-gradient {
  color: var(--color-white);
  border: 2px solid transparent;
  background: linear-gradient(rgb(13, 10, 16), rgb(13, 10, 16)) padding-box padding-box,
              linear-gradient(128deg, #1E40AF 0.55%, #06B6D4 98.63%) border-box border-box;
}

.navbar.force-scrolled .btn.btn-border-gradient:hover::after {
  background: linear-gradient(rgb(13, 10, 16), rgb(13, 10, 16)) padding-box padding-box,
              linear-gradient(128deg, #0EA5E9 0.55%, #10B981 98.63%) border-box border-box;
  border: 2px solid transparent;
  opacity: 1;
}
.navbar.force-scrolled .menu-toggle span { background: var(--color-black); }

/* 产品卡片链接修复 */
a.product-card { display: block; }

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

.navbar-logo {
  display: flex;
  align-items: center;
  color: var(--color-white);
  flex-shrink: 0;
  transition: color var(--transition);
}

.navbar-logo svg { height: 28px; width: auto; }

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

.nav-item { position: relative; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 8px 0;
  transition: color var(--transition);
}

.nav-link .chevron {
  width: 12px; height: 12px;
  transition: transform 0.2s ease;
}

.nav-item:hover .nav-link .chevron { transform: rotate(180deg); }

/* 下拉菜单 */
.dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  min-width: 260px;
  background: var(--color-white);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-md);
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: all 0.25s ease;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

.dropdown::before {
  content: '';
  position: absolute;
  top: -12px;
  left: 0; right: 0;
  height: 12px;
}

.nav-item:hover .dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 20px;
  font-size: 0.9375rem;
  color: var(--color-grey);
  transition: all 0.2s ease;
}

.dropdown-item:hover {
  color: var(--color-blue);
  background: var(--color-grey-lighter);
}

.dropdown-icon {
  width: 20px; height: 20px;
  color: var(--color-blue);
  flex-shrink: 0;
}

/* 导航右侧按钮 */
.navbar-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 汉堡菜单 */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px; height: 28px;
  z-index: 10001;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: all var(--transition);
  transform-origin: center;
}

.navbar.scrolled .menu-toggle span { background: var(--color-black); }

.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); }

/* ========== HERO (Bitmovin-inspired) ========== */
.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 144px 0 96px;
  background: #0C0E10;
  color: var(--color-white);
}

/* 背景：微弱噪点纹理 */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 256px 256px;
  pointer-events: none;
}

/* 背景：单一方向性光斑 */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 50% 40% at 70% 35%, rgba(37, 99, 235, 0.08) 0%, transparent 70%),
    radial-gradient(ellipse 35% 50% at 20% 75%, rgba(14, 165, 233, 0.05) 0%, transparent 60%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
  max-width: 1300px;
}

/* Two-Column Layout (Bitmovin: 44vw + 56vw) */
.hero-columns {
  display: flex;
  gap: 60px;
  align-items: center;
  margin-bottom: 60px;
}

.hero-column-left {
  flex: 0 0 44%;
  padding-top: 20px;
}

.hero-column-right {
  flex: 0 0 56%;
}

/* Hero Visual (Right Column Image) */
.hero-visual {
  position: relative;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-visual img {
  width: 100%;
  height: auto;
  display: block;
  -webkit-mask-image:
    linear-gradient(to right, transparent, black 18%, black 82%, transparent),
    linear-gradient(to bottom, transparent, black 18%, black 82%, transparent);
  -webkit-mask-composite: source-in;
  mask-image:
    linear-gradient(to right, transparent, black 18%, black 82%, transparent),
    linear-gradient(to bottom, transparent, black 18%, black 82%, transparent);
  mask-composite: intersect;
}

/* Typography */
.hero h1 {
  font-size: 4rem;
  line-height: 1.1;
  color: var(--color-white);
  margin-bottom: 30px;
  letter-spacing: -0.025em;
  font-weight: 700;
}

.hero-sub {
  font-size: 1.5rem;
  line-height: 1.6;
  color: var(--color-white);
  margin-bottom: 40px;
  font-weight: 400;
  max-width: 90%;
}

.hero-eyebrow {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--color-blue-light);
  margin-bottom: 20px;
  text-transform: uppercase;
}

/* Buttons */
.hero-ctas {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* Metrics Grid (Right Column) */
/* (hero-metrics removed — replaced by .hero-visual) */

/* Hero Bottom Extras */
.hero-extras {
  text-align: center;
  padding-top: 20px;
}

.hero-wins {
  font-size: 14px;
  color: #A3AFBA;
  text-transform: uppercase;
  letter-spacing: 3px;
  line-height: 1.8;
}

.logo-slider {
  flex: 1;
  overflow: hidden;
  mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}

.logo-track {
  display: flex;
  align-items: center;
  gap: 60px;
  animation: slideLogos 20s linear infinite;
  width: max-content;
}

.logo-track span {
  font-size: 1rem;
  font-weight: 600;
  color: rgba(255,255,255, 0.35);
  letter-spacing: 0.05em;
  white-space: nowrap;
  text-transform: uppercase;
}

@keyframes slideLogos {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ========== 产品区（Tab风格，深色背景） ========== */
.products-section {
  padding: var(--section-padding) 0;
  background: var(--color-white);
}

.products-header {
  text-align: center;
  margin-bottom: 64px;
}

.products-header h2 { color: var(--color-dark); }

/* 产品卡片 (Bitmovin Product Card) */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.product-card {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
  padding: 36px 32px;
  transition: all var(--transition);
  background: var(--color-white);
  position: relative;
  overflow: hidden;
}

.product-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--color-blue);
  opacity: 0;
  transition: opacity var(--transition);
}

.product-card:hover {
  border-color: rgba(37, 99, 235, 0.15);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
}

.product-card:hover::after { opacity: 1; }

.product-card:nth-child(2)::after { background: var(--color-accent); }
.product-card:nth-child(3)::after { background: #F59E0B; }
.product-card:nth-child(4)::after { background: #8B5CF6; }

.product-icon {
  width: 48px; height: 48px;
  margin-bottom: 20px;
  color: var(--color-blue);
}

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

.product-card h3 {
  margin-bottom: 8px;
  color: var(--color-dark);
}

.product-card p {
  color: var(--color-grey);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* ========== 图表/展示区（深色 + 渐变边框） ========== */
.diagram-section {
  padding: var(--section-padding) 0;
  background: var(--color-black);
  color: var(--color-white);
}

.diagram-wrapper {
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0;
}

.diagram-inner {
  border-radius: var(--radius-md);
  background: transparent;
  padding: 48px 40px;
}

.diagram-header {
  text-align: center;
  margin-bottom: 48px;
}

.diagram-header h2 { color: var(--color-white); }
.diagram-header p { color: var(--color-grey-light); }

.diagram-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.diagram-card {
  padding: 32px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.diagram-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.03);
}

.diagram-card-icon {
  width: 40px; height: 40px;
  margin-bottom: 16px;
  color: var(--color-blue-light);
}

.diagram-card h3 { color: var(--color-white); margin-bottom: 8px; }
.diagram-card p { color: var(--color-grey-light); font-size: 1rem; }

.diagram-card .link-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  color: var(--color-blue-light);
  font-size: 0.875rem;
  font-weight: 500;
  transition: gap 0.2s ease;
}

.diagram-card .link-more:hover { gap: 10px; }

/* ========== 产品展示区（白色背景，图文交替） ========== */
.showcase-section {
  padding: var(--section-padding) 0;
  background: var(--color-white);
}

.showcase-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  margin-bottom: 80px;
}

.showcase-item:last-child { margin-bottom: 0; }
.showcase-item.reverse { direction: rtl; }
.showcase-item.reverse > * { direction: ltr; }

.showcase-content h2 { color: var(--color-dark); margin-bottom: 16px; }

.showcase-content > p {
  color: var(--color-grey);
  font-size: 1.125rem;
  line-height: 1.7;
  margin-bottom: 24px;
}

.showcase-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}

.showcase-list-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--color-grey);
  font-size: 0.9375rem;
}

.showcase-list-item svg {
  width: 18px; height: 18px;
  color: var(--color-blue);
  flex-shrink: 0;
  margin-top: 3px;
}

/* 产品视觉区 */
.showcase-visual {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4/3;
  background: var(--color-black);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 抽象可视化背景 */
.showcase-visual::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 256px 256px;
}

.showcase-visual::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 50%, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
}

.showcase-visual .placeholder-content {
  text-align: center;
  color: rgba(255,255,255,0.35);
  position: relative;
  z-index: 1;
}

.showcase-visual .placeholder-content svg { width: 64px; height: 64px; margin: 0 auto 12px; opacity: 0.35; color: rgba(255,255,255,0.2); }
.showcase-visual .placeholder-content span { font-size: 0.8125rem; letter-spacing: 0.05em; }

/* ========== 数据统计 ========== */
.stats-section {
  padding: var(--section-padding) 0;
  background: var(--color-grey-lighter);
}

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

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

.stat-number {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.1;
  margin-bottom: 8px;
}

.stat-label {
  color: var(--color-grey);
  font-size: 0.9375rem;
}

/* ========== 合作伙伴（Bitmovin Innovators Network 风格） ========== */
.partners-section {
  padding: var(--section-padding) 0;
  background: var(--color-grey-lighter);
  text-align: center;
}

.section-label-blue {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-blue);
  margin-bottom: 14px;
}

.partners-desc {
  color: var(--color-grey);
  font-size: 1.125rem;
  line-height: 1.7;
  max-width: 640px;
  margin: 16px auto 0;
  padding: 0 24px;
}

/* Scrolling slider */
@keyframes scroll-partners {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.partners-slider-holder {
  max-width: 1240px;
  margin: 0 auto;
  display: flex;
}

.partners-slider {
  background: transparent;
  height: 100px;
  margin: 40px auto 0;
  overflow: hidden;
  position: relative;
  width: 100%;
}

.partners-slider::before,
.partners-slider::after {
  background: linear-gradient(to right, #F1F5F9, rgba(241, 245, 249, 0));
  content: "";
  height: 100px;
  position: absolute;
  width: 160px;
  z-index: 2;
}

.partners-slider::after {
  right: 0;
  top: 0;
  transform: rotateZ(180deg);
}

.partners-slider::before {
  left: 0;
  top: 0;
}

.partners-slide-track {
  animation: scroll-partners 50s linear infinite;
  display: flex;
  width: max-content;
}

.partners-slide {
  height: 100px;
  display: flex;
  align-items: center;
  margin: 0 35px;
  flex-shrink: 0;
}

.partners-slide svg {
  height: 40px;
  width: auto;
}

/* ========== CTA 区 ========== */
.cta-section {
  padding: var(--section-padding) 0;
  position: relative;
  overflow: hidden;
  background: var(--color-black);
}

.cta-box {
  position: relative;
  padding: 80px 40px;
  text-align: center;
}

/* CTA 背景 */
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 60% at 50% 50%, rgba(37, 99, 235, 0.06) 0%, transparent 70%);
}

.cta-box > * { position: relative; }

.cta-box h2 {
  color: var(--color-white);
  margin-bottom: 16px;
}

.cta-box p {
  color: var(--color-grey-light);
  font-size: 1.25rem;
  margin-bottom: 32px;
}

/* ========== Footer（白色，Bitmovin风格） ========== */
.footer {
  padding: 64px 0 24px;
  background: var(--color-white);
  border-top: 1px solid var(--color-border-light);
}

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

.footer-brand { max-width: 280px; }

.footer-logo {
  display: flex;
  align-items: center;
  color: var(--color-dark);
  margin-bottom: 16px;
}

.footer-logo svg { height: 24px; width: auto; }
.footer-logo svg path,
.footer-logo svg text { fill: var(--color-dark); }

.footer-brand p {
  color: var(--color-grey);
  font-size: 0.875rem;
  line-height: 1.7;
}

.footer-col h4 {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-dark);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 20px;
}

.footer-col a {
  display: block;
  font-size: 0.9375rem;
  color: var(--color-grey);
  padding: 4px 0;
  transition: color 0.2s ease;
}

.footer-col a:hover { color: var(--color-blue); }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--color-border-light);
  font-size: 0.8125rem;
  color: var(--color-grey);
}

.footer-bottom-links {
  display: flex;
  gap: 24px;
}

.footer-bottom-links a {
  color: var(--color-grey);
  transition: color 0.2s ease;
}

.footer-bottom-links a:hover { color: var(--color-blue); }

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

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

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

/* ========== 移动端菜单 ========== */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  top: var(--navbar-height);
  background: var(--color-white);
  z-index: 9998;
  padding: 24px;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--transition);
}

.mobile-menu.open { transform: translateX(0); }

.mobile-nav-item { border-bottom: 1px solid rgba(0,0,0,0.06); }

.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--color-dark);
}

.mobile-nav-link .chevron {
  width: 16px; height: 16px;
  color: var(--color-grey);
  transition: transform 0.2s ease;
}

.mobile-nav-item.expanded .mobile-nav-link .chevron { transform: rotate(180deg); }

.mobile-dropdown {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.mobile-nav-item.expanded .mobile-dropdown { max-height: 300px; }

.mobile-dropdown a {
  display: block;
  padding: 10px 0 10px 16px;
  color: var(--color-grey);
  font-size: 1rem;
}

.mobile-dropdown a:hover { color: var(--color-blue); }

.mobile-menu-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid rgba(0,0,0,0.06);
}

.mobile-menu-actions .btn {
  width: 100%;
  justify-content: center;
}

.mobile-menu-actions .btn-border-gradient {
  background: var(--color-blue);
  color: var(--color-white);
  border-color: var(--color-blue);
}

/* ========== 响应式 ========== */
@media (max-width: 1200px) {
  .hero-columns {
    flex-direction: column;
    gap: 40px;
  }

  .hero-column-left,
  .hero-column-right {
    flex: 1 1 100%;
    text-align: center;
  }

  .hero-column-left {
    padding-top: 0;
  }

  .hero h1 {
    font-size: 2.5rem;
    text-align: center;
  }

  .hero-sub {
    max-width: 90%;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
  }

  .hero-ctas {
    justify-content: center;
  }

}

@media (max-width: 1024px) {
  :root { --section-padding: 72px; }

  .hero h1 {
    font-size: 2.25rem;
  }

  .hero-sub {
    font-size: 1.25rem;
  }


  .hero-extras {
    text-align: center;
    padding-bottom: 40px;
  }

  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .diagram-grid { grid-template-columns: 1fr; }
  .showcase-item { grid-template-columns: 1fr; gap: 32px; }
  .showcase-item.reverse { direction: ltr; }

  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: 1 / -1; max-width: 100%; }

  .partners-slider::before,
  .partners-slider::after { width: 80px; }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 60px;
    --container-padding: 20px;
    --navbar-height: 64px;
  }

  .navbar-nav, .navbar-actions { display: none; }
  .menu-toggle { display: flex; }
  .mobile-menu { display: block; }

  .hero { padding: 100px 0 60px; }

  .hero-columns {
    gap: 30px;
  }

  .hero h1 {
    font-size: 2rem;
    line-height: 1.15;
  }

  .hero-sub {
    font-size: 1rem;
    line-height: 1.5;
  }

  .hero-ctas {
    flex-direction: column;
    width: 100%;
  }

  .hero-ctas .btn {
    width: 100%;
  }


  .metric-label {
    font-size: 0.75rem;
  }

  .product-grid { grid-template-columns: 1fr; }
  .product-card { padding: 24px; }

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

  .partners-slider { height: 80px; }
  .partners-slide { height: 80px; margin: 0 24px; }
  .partners-slide svg { height: 32px; }
  .partners-slider::before,
  .partners-slider::after { width: 60px; height: 80px; }

  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
}