/* ==========================================================================
   biubiu加速器 官网核心样式 - 科技电竞风格
   Design Language: Deep Tech Esports + Electric Cyan & Neon Lime
   ========================================================================== */

:root {
  /* 品牌调色板 */
  --bg-main: #080F24;
  --bg-darker: #050A19;
  --bg-card: #121F3B;
  --bg-card-hover: #16274B;
  --bg-card-subtle: rgba(18, 31, 59, 0.7);
  --bg-header: rgba(8, 15, 36, 0.85);

  --cyan: #00DFF5;
  --cyan-glow: rgba(0, 223, 245, 0.35);
  --lime: #B8FF45;
  --lime-glow: rgba(184, 255, 69, 0.35);
  --purple: #735CFF;
  --purple-glow: rgba(115, 92, 255, 0.3);

  --text-title: #F8FAFF;
  --text-body: #A9B7CF;
  --text-muted: #6B7D9D;
  --border-light: rgba(255, 255, 255, 0.08);
  --border-cyan: rgba(0, 223, 245, 0.3);

  /* 阴影与光效 */
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 25px rgba(0, 223, 245, 0.25);
  --shadow-button: 0 4px 20px rgba(0, 223, 245, 0.3);

  /* 布局与排版 */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --container-max: 1200px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-body);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(115, 92, 255, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 30%, rgba(0, 223, 245, 0.1) 0%, transparent 45%),
    radial-gradient(circle at 50% 80%, rgba(184, 255, 69, 0.06) 0%, transparent 50%),
    linear-gradient(to bottom, #080F24 0%, #050A19 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

/* 装饰性网格背景 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background-size: 50px 50px;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  z-index: -1;
}

/* 链接与排版 */
a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

img, svg {
  vertical-align: middle;
  max-width: 100%;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-title);
  font-weight: 700;
  line-height: 1.25;
}

p {
  color: var(--text-body);
}

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

/* ==========================================================================
   通用组件与按钮
   ========================================================================== */

/* 徽章 Badge */
.badge-tech {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(0, 223, 245, 0.08);
  border: 1px solid rgba(0, 223, 245, 0.25);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-transform: uppercase;
  margin-bottom: 20px;
  backdrop-filter: blur(8px);
}
.badge-tech .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--lime);
  box-shadow: 0 0 8px var(--lime);
  animation: pulseDot 2s infinite ease-in-out;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

/* 按钮 Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 26px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  text-align: center;
  user-select: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--cyan) 0%, #0099FF 100%);
  color: #050A19;
  font-weight: 700;
  box-shadow: var(--shadow-button);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(0, 223, 245, 0.45);
  background: linear-gradient(135deg, #2df0ff 0%, #1aa3ff 100%);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-title);
  border-color: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(6px);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-2px);
}

.btn-lime {
  background: linear-gradient(135deg, var(--lime) 0%, #8ae010 100%);
  color: #050A19;
  font-weight: 700;
  box-shadow: 0 4px 20px rgba(184, 255, 69, 0.3);
}
.btn-lime:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(184, 255, 69, 0.5);
}

.btn-lg {
  padding: 15px 34px;
  font-size: 17px;
  border-radius: var(--radius-md);
}

/* 区块通用标题 */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 60px;
}
.section-header .sub-eng {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--cyan);
  text-transform: uppercase;
  margin-bottom: 8px;
  display: block;
}
.section-header h2 {
  font-size: clamp(26px, 4vw, 36px);
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}
.section-header p {
  font-size: 16px;
  color: var(--text-body);
}

/* ==========================================================================
   SECTION 01: 顶部导航 Navbar
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--bg-header);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}

.site-header.scrolled {
  background: rgba(8, 15, 36, 0.95);
  box-shadow: 0 4px 25px rgba(0, 0, 0, 0.5);
  border-bottom-color: rgba(0, 223, 245, 0.2);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 800;
  color: var(--text-title);
  letter-spacing: -0.02em;
}
.brand-logo .logo-icon {
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 0 10px var(--cyan-glow));
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.nav-links li a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-body);
  position: relative;
  padding: 6px 0;
}
.nav-links li a:hover,
.nav-links li a.active {
  color: var(--cyan);
}
.nav-links li a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
  transition: width 0.25s ease;
}
.nav-links li a:hover::after,
.nav-links li a.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-nav-download {
  padding: 8px 18px;
  font-size: 14px;
}

/* 手机汉堡按钮 */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-title);
}
.hamburger svg {
  width: 26px;
  height: 26px;
}

/* ==========================================================================
   SECTION 02: Hero 首屏
   ========================================================================== */
.hero-section {
  padding-top: 135px;
  padding-bottom: 90px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 48px;
}

.hero-content h1 {
  font-size: clamp(34px, 5.2vw, 56px);
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  line-height: 1.18;
}
.text-cyan {
  color: var(--cyan);
  text-shadow: 0 0 20px rgba(0, 223, 245, 0.4);
}
.text-lime {
  color: var(--lime);
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-body);
  margin-bottom: 34px;
  max-width: 540px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.platform-support {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
}
.platform-icons {
  display: flex;
  gap: 12px;
}
.plat-item {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.04);
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  font-size: 12px;
  color: var(--text-body);
}
.plat-item svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

/* 右侧 3D 悬浮软件界面 / 科技装置模型 */
.hero-visual {
  position: relative;
  perspective: 1000px;
}

.app-mockup-wrapper {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.02) 100%);
  padding: 1px;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7), 0 0 30px rgba(0, 223, 245, 0.15);
  transform: rotateY(-6deg) rotateX(4deg);
  transition: transform 0.4s ease;
}
.app-mockup-wrapper:hover {
  transform: rotateY(0deg) rotateX(0deg);
}

.app-window {
  background: #0D162C;
  border-radius: calc(var(--radius-lg) - 1px);
  overflow: hidden;
  border: 1px solid rgba(0, 223, 245, 0.2);
}

.window-header {
  height: 38px;
  background: #091022;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 8px;
}
.window-dots {
  display: flex;
  gap: 6px;
}
.window-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.dot-red { background: #FF5F56; }
.dot-yellow { background: #FFBD2E; }
.dot-green { background: #27C93F; }
.window-title {
  margin-left: auto;
  margin-right: auto;
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.window-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.client-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(18, 31, 59, 0.8);
  padding: 14px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}
.status-left {
  display: flex;
  align-items: center;
  gap: 12px;
}
.status-indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 12px var(--lime);
}
.status-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-title);
}
.status-desc {
  font-size: 12px;
  color: var(--text-muted);
}
.speed-tag {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan);
  background: rgba(0, 223, 245, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0, 223, 245, 0.3);
}

/* 核心连接仪表大按钮 */
.client-meter-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 0;
  position: relative;
}
.cyber-connect-circle {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  border: 2px dashed rgba(0, 223, 245, 0.35);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle, rgba(0, 223, 245, 0.15) 0%, rgba(13, 22, 44, 0.8) 70%);
  box-shadow: 0 0 30px rgba(0, 223, 245, 0.2);
  cursor: pointer;
  position: relative;
}
.cyber-connect-circle::before {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 2px solid transparent;
  border-top-color: var(--cyan);
  border-bottom-color: var(--lime);
  animation: spinRing 6s linear infinite;
}
@keyframes spinRing {
  100% { transform: rotate(360deg); }
}
.circle-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}
.circle-text {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-title);
  margin-top: 4px;
}

.client-route-box {
  background: rgba(18, 31, 59, 0.5);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.route-info {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
}
.route-flag {
  width: 22px;
  height: 16px;
  border-radius: 2px;
  background: #344871;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
}

/* ==========================================================================
   SECTION 03: 核心技术优势 (MODULE 卡片风格)
   ========================================================================== */
.features-section {
  padding: 100px 0;
  position: relative;
}

.modules-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.module-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
}
.module-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-cyan);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.6), 0 0 25px rgba(0, 223, 245, 0.2);
}

.module-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}
.module-card:hover::before {
  opacity: 1;
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.module-no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--cyan);
  background: rgba(0, 223, 245, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0, 223, 245, 0.25);
}
.module-tag-eng {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

.module-card h3 {
  font-size: 24px;
  margin-bottom: 12px;
}
.module-card p {
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.65;
  margin-bottom: 28px;
}

/* 原创 3D 科技图形插画展示区 */
.module-visual-box {
  margin-top: auto;
  height: 150px;
  border-radius: var(--radius-md);
  background: rgba(8, 15, 36, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

/* ==========================================================================
   SECTION 04: 客户端产品展示 (Client Showcase)
   ========================================================================== */
.showcase-section {
  padding: 100px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(16, 26, 53, 0.5) 50%, transparent 100%);
}

.showcase-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.showcase-big-window {
  background: #0B1326;
  border: 1px solid rgba(0, 223, 245, 0.25);
  border-radius: var(--radius-lg);
  box-shadow: 0 25px 70px rgba(0, 0, 0, 0.8), 0 0 35px rgba(115, 92, 255, 0.2);
  overflow: hidden;
}

.showcase-inner {
  display: grid;
  grid-template-columns: 240px 1fr 280px;
  min-height: 480px;
}

/* 侧边栏 */
.client-sidebar {
  background: #080E1E;
  border-right: 1px solid var(--border-light);
  padding: 24px 18px;
  display: flex;
  flex-direction: column;
}
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 30px;
}
.sidebar-menu {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.sidebar-menu li a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-muted);
}
.sidebar-menu li a.active,
.sidebar-menu li a:hover {
  background: rgba(0, 223, 245, 0.1);
  color: var(--cyan);
}

/* 主面板 */
.client-main-view {
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: radial-gradient(circle at 50% 40%, rgba(0, 223, 245, 0.05) 0%, transparent 70%);
}
.main-view-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.vip-card-mini {
  background: linear-gradient(135deg, rgba(115, 92, 255, 0.2) 0%, rgba(0, 223, 245, 0.15) 100%);
  border: 1px solid rgba(115, 92, 255, 0.3);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  font-size: 13px;
}

.center-speed-display {
  text-align: center;
  padding: 30px 0;
}
.speed-circle-hero {
  width: 170px;
  height: 170px;
  margin: 0 auto 20px;
  border-radius: 50%;
  border: 3px solid rgba(0, 223, 245, 0.2);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle, rgba(0, 223, 245, 0.1) 0%, #0B1326 70%);
  box-shadow: 0 0 35px rgba(0, 223, 245, 0.25);
  position: relative;
}
.speed-val {
  font-size: 32px;
  font-weight: 800;
  color: var(--cyan);
  font-family: var(--font-mono);
}
.speed-unit {
  font-size: 12px;
  color: var(--text-muted);
}

/* 右侧线路列表 */
.client-nodes-pane {
  background: #091022;
  border-left: 1px solid var(--border-light);
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
}
.nodes-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 14px;
  display: flex;
  justify-content: space-between;
}
.nodes-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background: rgba(18, 31, 59, 0.5);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}
.node-item:hover, .node-item.selected {
  border-color: var(--cyan);
  background: rgba(0, 223, 245, 0.1);
}
.node-ping {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--lime);
}

.concept-disclaimer {
  text-align: center;
  margin-top: 14px;
  font-size: 12px;
  color: var(--text-muted);
}

/* ==========================================================================
   SECTION 05: 产品应用场景
   ========================================================================== */
.scenarios-section {
  padding: 90px 0;
}

.scenarios-nav {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 45px;
  flex-wrap: wrap;
}
.scenario-tab {
  padding: 10px 22px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-light);
  color: var(--text-body);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.scenario-tab:hover, .scenario-tab.active {
  background: var(--cyan);
  color: #050A19;
  border-color: var(--cyan);
  box-shadow: 0 4px 15px rgba(0, 223, 245, 0.3);
}

.scenarios-content {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.scenario-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition);
}
.scenario-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-cyan);
}
.scenario-card .icon-box {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-md);
  background: rgba(0, 223, 245, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--cyan);
}
.scenario-card h4 {
  font-size: 18px;
  margin-bottom: 10px;
}
.scenario-card p {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
}

/* ==========================================================================
   SECTION 06: 下载中心
   ========================================================================== */
.download-section {
  padding: 110px 0;
  background: radial-gradient(circle at 50% 50%, rgba(0, 223, 245, 0.08) 0%, transparent 60%);
  position: relative;
}

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

.platform-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 34px 24px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
}
.platform-card.current-os {
  border-color: var(--cyan);
  box-shadow: 0 0 30px rgba(0, 223, 245, 0.3);
  transform: translateY(-5px);
}
.current-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--cyan);
  color: #050A19;
  font-size: 11px;
  font-weight: 800;
  padding: 3px 12px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.plat-logo-wrap {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  color: var(--text-title);
  transition: var(--transition);
}
.platform-card:hover .plat-logo-wrap {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(0, 223, 245, 0.1);
}
.platform-card h3 {
  font-size: 20px;
  margin-bottom: 6px;
}
.plat-ver {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.plat-req {
  font-size: 12px;
  color: var(--text-body);
  margin-bottom: 24px;
  min-height: 36px;
}
.platform-card .btn {
  margin-top: auto;
  width: 100%;
}

/* ==========================================================================
   SECTION 07: 使用教程
   ========================================================================== */
.steps-section {
  padding: 90px 0;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  position: relative;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  position: relative;
}
.step-number {
  font-family: var(--font-mono);
  font-size: 42px;
  font-weight: 800;
  color: rgba(0, 223, 245, 0.25);
  line-height: 1;
  margin-bottom: 18px;
}
.step-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}
.step-card p {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.65;
}

/* ==========================================================================
   SECTION 08: 套餐展示
   ========================================================================== */
.pricing-section {
  padding: 100px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(18, 31, 59, 0.4) 50%, transparent 100%);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}
.pricing-card:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 255, 255, 0.2);
}

.pricing-card.featured {
  background: #152445;
  border-color: var(--cyan);
  box-shadow: 0 15px 45px rgba(0, 0, 0, 0.6), 0 0 35px rgba(0, 223, 245, 0.25);
  transform: scale(1.03);
}
.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-5px);
}

.featured-tag {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, var(--lime), #8ae010);
  color: #050A19;
  font-size: 12px;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-full);
}

.plan-head {
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 24px;
  margin-bottom: 24px;
}
.plan-name {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}
.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
}
.plan-currency {
  font-size: 22px;
  font-weight: 700;
  color: var(--cyan);
}
.plan-price {
  font-family: var(--font-mono);
  font-size: 46px;
  font-weight: 800;
  color: var(--text-title);
  line-height: 1;
}
.plan-period {
  font-size: 14px;
  color: var(--text-muted);
}
.plan-billing-note {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 6px;
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}
.plan-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-body);
}
.plan-features li svg {
  width: 16px;
  height: 16px;
  color: var(--cyan);
  flex-shrink: 0;
}

.pricing-card .btn {
  width: 100%;
}

/* ==========================================================================
   SECTION 09: FAQ 手风琴
   ========================================================================== */
.faq-section {
  padding: 90px 0;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.active {
  border-color: var(--border-cyan);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  color: var(--text-title);
  font-size: 16px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  cursor: pointer;
}
.faq-arrow {
  transition: transform 0.3s ease;
  color: var(--cyan);
}
.faq-item.active .faq-arrow {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
  color: var(--text-body);
  font-size: 14px;
  line-height: 1.7;
}
.faq-item.active .faq-answer {
  padding: 0 24px 20px 24px;
}

/* ==========================================================================
   SECTION 10: 页脚 Footer
   ========================================================================== */
.site-footer {
  background: var(--bg-darker);
  border-top: 1px solid var(--border-light);
  padding: 70px 0 30px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-about p {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 14px;
  line-height: 1.6;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 18px;
}
.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links li a {
  font-size: 14px;
  color: var(--text-muted);
}
.footer-links li a:hover {
  color: var(--cyan);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-muted);
}

/* ==========================================================================
   购买流程与通用下载弹窗 Modal
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(5, 10, 25, 0.85);
  backdrop-filter: blur(10px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.28s ease;
}
.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-dialog {
  background: #0D162C;
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-lg);
  box-shadow: 0 25px 70px rgba(0, 0, 0, 0.8), 0 0 40px rgba(0, 223, 245, 0.2);
  width: 100%;
  max-width: 580px;
  overflow: hidden;
  transform: scale(0.95) translateY(10px);
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}
.modal-overlay.active .modal-dialog {
  transform: scale(1) translateY(0);
}

.modal-header {
  padding: 24px 28px 18px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}
.modal-title-group h3 {
  font-size: 20px;
  margin-bottom: 6px;
}
.modal-title-group p {
  font-size: 13px;
  color: var(--text-muted);
}
.modal-close-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.modal-close-btn:hover {
  color: var(--text-title);
  background: rgba(255, 255, 255, 0.08);
}

.modal-body {
  padding: 24px 28px;
}
.modal-detected-bar {
  background: rgba(0, 223, 245, 0.08);
  border: 1px solid rgba(0, 223, 245, 0.25);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.detected-text {
  font-size: 13px;
  color: var(--cyan);
  font-weight: 600;
}

.modal-download-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.modal-dl-item {
  background: rgba(18, 31, 59, 0.6);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: var(--transition);
  cursor: pointer;
}
.modal-dl-item:hover, .modal-dl-item.detected {
  border-color: var(--cyan);
  background: rgba(0, 223, 245, 0.08);
}
.dl-name {
  font-weight: 700;
  font-size: 15px;
  color: var(--text-title);
}
.dl-meta {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.modal-footer {
  padding: 16px 28px;
  background: #091022;
  border-top: 1px solid var(--border-light);
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
}

/* 手机底部固定悬浮下载栏 */
.mobile-fixed-bottom {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: rgba(8, 15, 36, 0.95);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--border-cyan);
  padding: 12px 20px;
  z-index: 990;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.6);
}
.mobile-fixed-bottom .btn {
  width: 100%;
}

/* ==========================================================================
   移动端响应式适配 (390px, 430px, 768px, 1024px)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-actions {
    justify-content: center;
  }
  .platform-support {
    justify-content: center;
  }
  .showcase-inner {
    grid-template-columns: 1fr;
  }
  .client-sidebar, .client-nodes-pane {
    display: none;
  }
  .platforms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hamburger {
    display: block;
  }
  .nav-links {
    position: fixed;
    top: 74px;
    left: 0;
    width: 100%;
    background: #091022;
    border-bottom: 1px solid var(--border-cyan);
    flex-direction: column;
    padding: 24px;
    gap: 18px;
    display: none;
  }
  .nav-links.open {
    display: flex;
  }
  .header-actions .btn-nav-download {
    display: none;
  }
  .modules-grid {
    grid-template-columns: 1fr;
  }
  .scenarios-content {
    grid-template-columns: 1fr;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-4px);
  }
  .platforms-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
  .modal-download-grid {
    grid-template-columns: 1fr;
  }
  .mobile-fixed-bottom {
    display: block;
  }
  body {
    padding-bottom: 70px;
  }
}