/* ==========================================================================
   CC加速器 官方落地页 - 电竞科技视觉系统规范
   品牌域名: ccspeed.sbs
   配色: 深蓝黑背景 #0B1020, 次级背景 #121C30, 卡片 #18243A, 品牌蓝 #168BFF, 荧光青 #00E5DD
   ========================================================================== */

:root {
  --bg-main: #0B1020;
  --bg-secondary: #121C30;
  --bg-card: #18243A;
  --bg-card-hover: #1f304d;
  --bg-card-glow: rgba(22, 139, 255, 0.12);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(0, 229, 221, 0.4);
  
  --primary-blue: #168BFF;
  --cyan-neon: #00E5DD;
  --text-main: #FFFFFF;
  --text-muted: #A6B4CE;
  --text-dim: #6B7C99;
  
  --btn-gradient: linear-gradient(110deg, #168BFF 0%, #00E5DD 100%);
  --btn-gradient-hover: linear-gradient(110deg, #1fa0ff 0%, #20f6ee 100%);
  --hero-glow: radial-gradient(circle at 50% 30%, rgba(22, 139, 255, 0.22) 0%, rgba(0, 229, 221, 0.08) 35%, transparent 70%);

  --font-sans: -apple-system, BlinkMacSystemFont, "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --font-mono: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --container-max: 1200px;
  --header-height: 72px;
  --transition-smooth: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(circle at 10% 15%, rgba(22, 139, 255, 0.09) 0%, transparent 40%),
    radial-gradient(circle at 90% 65%, rgba(0, 229, 221, 0.06) 0%, transparent 45%),
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
}

/* Links & Typography */
a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-smooth);
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  background: transparent;
}

.container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* Section Header Styles */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(22, 139, 255, 0.12);
  border: 1px solid rgba(0, 229, 221, 0.3);
  color: var(--cyan-neon);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}

.section-tag-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--cyan-neon);
  box-shadow: 0 0 8px var(--cyan-neon);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: #FFFFFF;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.65;
}

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

/* Common Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--btn-gradient);
  color: #070B14;
  font-weight: 700;
  font-size: 1rem;
  padding: 14px 28px;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 229, 221, 0.35), 0 0 0 1px rgba(255, 255, 255, 0.15) inset;
  transition: var(--transition-smooth);
  cursor: pointer;
}

.btn-primary:hover {
  background: var(--btn-gradient-hover);
  box-shadow: 0 6px 28px rgba(0, 229, 221, 0.55), 0 0 0 1px rgba(255, 255, 255, 0.3) inset;
  transform: translateY(-2px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-main);
  font-weight: 600;
  font-size: 1rem;
  padding: 14px 28px;
  border-radius: 8px;
  transition: var(--transition-smooth);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(0, 229, 221, 0.4);
  color: #FFFFFF;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.9rem;
  border-radius: 6px;
}

/* ==========================================================================
   SECTION 1 — Header & Navigation
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  background: rgba(11, 16, 32, 0.75);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.site-header.scrolled {
  background: rgba(11, 16, 32, 0.95);
  border-bottom: 1px solid rgba(22, 139, 255, 0.2);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

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

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

.brand-logo-svg {
  width: 36px;
  height: 36px;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  background: linear-gradient(90deg, #FFFFFF 0%, var(--cyan-neon) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: #FFFFFF;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--cyan-neon);
  transition: width 0.2s ease;
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

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

.mobile-toggle {
  display: none;
  background: transparent;
  color: var(--text-main);
  padding: 8px;
}

.mobile-toggle svg {
  width: 26px;
  height: 26px;
}

/* Mobile Nav Drawer */
.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: rgba(14, 21, 38, 0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: 24px;
  flex-direction: column;
  gap: 16px;
  z-index: 999;
}

.mobile-nav-drawer.open {
  display: flex;
}

.mobile-nav-link {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.mobile-nav-link:hover {
  color: var(--cyan-neon);
}

/* ==========================================================================
   SECTION 2 — Hero Banner
   ========================================================================== */
.hero-section {
  position: relative;
  padding-top: calc(var(--header-height) + 64px);
  padding-bottom: 80px;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-glow-bg {
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 500px;
  background: var(--hero-glow);
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
}

.hero-grid-decor {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at center, transparent 30%, var(--bg-main) 80%);
  pointer-events: none;
  z-index: 1;
}

.hero-container {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(22, 139, 255, 0.15);
  border: 1px solid rgba(22, 139, 255, 0.35);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--cyan-neon);
  margin-bottom: 24px;
}

.hero-badge-pill {
  background: var(--primary-blue);
  color: #FFFFFF;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 700;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-title-gradient {
  background: linear-gradient(100deg, #FFFFFF 15%, #58C5FF 55%, #00E5DD 95%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  font-style: italic;
  padding-right: 6px;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 36px;
  max-width: 540px;
}

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

.hero-platforms {
  display: flex;
  align-items: center;
  gap: 18px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.85rem;
  color: var(--text-dim);
}

.hero-platform-icons {
  display: flex;
  align-items: center;
  gap: 14px;
}

.hero-platform-item {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
}

.hero-platform-item svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* Hero Right: Interactive Mockup Showcase */
.hero-mockup-wrapper {
  position: relative;
  perspective: 1000px;
}

.client-mockup-window {
  background: #10192A;
  border: 1px solid rgba(22, 139, 255, 0.3);
  border-radius: 14px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.65), 0 0 30px rgba(22, 139, 255, 0.15);
  overflow: hidden;
  transform: rotateY(-6deg) rotateX(4deg);
  transition: transform 0.4s ease;
}

.client-mockup-window:hover {
  transform: rotateY(0) rotateX(0);
}

.mockup-header-bar {
  background: #0C1220;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.mockup-controls {
  display: flex;
  gap: 6px;
}

.mockup-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
}

.mockup-dot.red { background: #FF5F56; }
.mockup-dot.yellow { background: #FFBD2E; }
.mockup-dot.green { background: #27C93F; }

.mockup-title {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-weight: 500;
}

.mockup-body {
  padding: 24px;
}

.mockup-status-card {
  background: rgba(22, 139, 255, 0.08);
  border: 1px dashed rgba(0, 229, 221, 0.35);
  border-radius: 10px;
  padding: 18px;
  text-align: center;
  margin-bottom: 20px;
}

.mockup-ping-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(0, 229, 221, 0.15);
  color: var(--cyan-neon);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.mockup-connect-btn {
  width: 110px;
  height: 110px;
  margin: 12px auto;
  border-radius: 50%;
  background: radial-gradient(circle, #168BFF 0%, #0c4ea3 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  box-shadow: 0 0 25px rgba(22, 139, 255, 0.6);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.mockup-connect-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 0 35px rgba(0, 229, 221, 0.8);
}

.mockup-node-select {
  background: #0E1626;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
}

.mockup-node-label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
}

.node-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan-neon);
}

.mockup-disclaimer {
  font-size: 0.72rem;
  color: var(--text-dim);
  text-align: center;
  margin-top: 14px;
}

/* ==========================================================================
   SECTION 3 — Core Features (左右交错大型板块)
   ========================================================================== */
.features-section {
  padding: 100px 0;
  position: relative;
}

.feature-rows {
  margin-top: 56px;
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 56px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 44px;
  position: relative;
  overflow: hidden;
  transition: var(--transition-smooth);
}

.feature-row:hover {
  border-color: rgba(22, 139, 255, 0.4);
  background: var(--bg-card-hover);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4), 0 0 20px var(--bg-card-glow);
}

.feature-row.reverse {
  direction: rtl;
}
.feature-row.reverse > * {
  direction: ltr;
}

.feature-content {
  position: relative;
  z-index: 2;
}

.feature-index {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 900;
  color: rgba(22, 139, 255, 0.25);
  line-height: 1;
  margin-bottom: 12px;
}

.feature-headline {
  font-size: 1.8rem;
  font-weight: 800;
  color: #FFFFFF;
  margin-bottom: 8px;
}

.feature-tagline {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--cyan-neon);
  margin-bottom: 16px;
}

.feature-text {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}

.feature-visual {
  position: relative;
  border-radius: 12px;
  background: #0D1424;
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 240px;
}

/* ==========================================================================
   SECTION 4 — Client Showcase (客户端展示)
   ========================================================================== */
.showcase-section {
  padding: 100px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.showcase-grid {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.showcase-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 28px;
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

.showcase-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 221, 0.35);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
}

.showcase-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.showcase-icon-box {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(22, 139, 255, 0.15);
  border: 1px solid rgba(22, 139, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan-neon);
}

.showcase-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #FFFFFF;
}

.showcase-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.showcase-graphic-box {
  background: #0B1020;
  border-radius: 8px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.04);
}

/* ==========================================================================
   SECTION 5 — Download Center (下载中心)
   ========================================================================== */
.download-section {
  padding: 100px 0;
  position: relative;
}

.os-detected-banner {
  max-width: 620px;
  margin: 32px auto 48px auto;
  background: rgba(22, 139, 255, 0.1);
  border: 1px solid rgba(0, 229, 221, 0.3);
  border-radius: 10px;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.os-detected-text {
  font-size: 0.92rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.os-detected-text strong {
  color: var(--cyan-neon);
}

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

.dl-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  position: relative;
}

.dl-card:hover {
  transform: translateY(-5px);
  border-color: rgba(22, 139, 255, 0.4);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5);
}

.dl-card.highlight-system {
  border-color: var(--cyan-neon);
  box-shadow: 0 0 25px rgba(0, 229, 221, 0.25);
}

.dl-badge-auto {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--cyan-neon);
  color: #070B14;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 999px;
  white-space: nowrap;
}

.dl-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 18px auto;
  color: var(--primary-blue);
}

.dl-card:hover .dl-icon {
  color: var(--cyan-neon);
  transform: scale(1.08);
  transition: transform 0.2s ease;
}

.dl-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 6px;
}

.dl-meta {
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 14px;
}

.dl-req {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  min-height: 40px;
  line-height: 1.4;
}

.dl-card .btn-primary, .dl-card .btn-secondary {
  width: 100%;
  margin-top: auto;
}

/* ==========================================================================
   SECTION 6 — 3-Step Guide (使用步骤)
   ========================================================================== */
.steps-section {
  padding: 90px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.steps-grid {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  position: relative;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 32px;
  position: relative;
}

.step-number {
  font-family: var(--font-mono);
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(180deg, var(--cyan-neon) 0%, rgba(0, 229, 221, 0.1) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 16px;
}

.step-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.step-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   SECTION 7 — Pricing (套餐介绍)
   ========================================================================== */
.pricing-section {
  padding: 100px 0;
}

.pricing-grid {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition-smooth);
}

.pricing-card.highlight {
  border-color: var(--primary-blue);
  box-shadow: 0 0 35px rgba(22, 139, 255, 0.28);
  transform: translateY(-8px);
}

.pricing-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--btn-gradient);
  color: #070B14;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 3px 14px;
  border-radius: 999px;
  letter-spacing: 0.05em;
}

.pricing-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 16px;
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.pricing-currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--cyan-neon);
}

.pricing-amount {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  color: #FFFFFF;
}

.pricing-period {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.pricing-specs {
  list-style: none;
  margin-bottom: 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-grow: 1;
}

.pricing-spec-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.pricing-spec-item svg {
  width: 16px;
  height: 16px;
  color: var(--cyan-neon);
  flex-shrink: 0;
}

/* ==========================================================================
   SECTION 8 — FAQ Accordion
   ========================================================================== */
.faq-section {
  padding: 90px 0;
  background: var(--bg-secondary);
}

.faq-list {
  max-width: 800px;
  margin: 48px auto 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
  transition: var(--transition-smooth);
}

.faq-item.open {
  border-color: rgba(22, 139, 255, 0.4);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 600;
  color: #FFFFFF;
  background: transparent;
  cursor: pointer;
}

.faq-icon-arrow {
  width: 20px;
  height: 20px;
  color: var(--cyan-neon);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.faq-item.open .faq-icon-arrow {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  max-height: 300px;
  padding-bottom: 20px;
  transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
}

/* ==========================================================================
   SECTION 9 — Footer
   ========================================================================== */
.site-footer {
  background: #070B14;
  border-top: 1px solid var(--border-color);
  padding: 64px 0 32px 0;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-desc {
  color: var(--text-muted);
  margin-top: 16px;
  max-width: 320px;
  line-height: 1.6;
}

.footer-column h4 {
  color: #FFFFFF;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a:hover {
  color: var(--cyan-neon);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

/* ==========================================================================
   SECTION 10 — Download Modal (客户端下载统一弹窗)
   ========================================================================== */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(4, 7, 14, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.modal-overlay.active {
  display: flex;
  opacity: 1;
}

.modal-content {
  background: #0E1626;
  border: 1px solid rgba(22, 139, 255, 0.35);
  border-radius: 18px;
  max-width: 600px;
  width: 100%;
  padding: 36px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8), 0 0 35px rgba(22, 139, 255, 0.2);
  position: relative;
  transform: scale(0.95);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active .modal-content {
  transform: scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: var(--transition-smooth);
}

.modal-close-btn:hover {
  background: rgba(255, 255, 255, 0.16);
  color: #FFFFFF;
}

.modal-header {
  text-align: center;
  margin-bottom: 28px;
}

.modal-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: #FFFFFF;
  margin-bottom: 8px;
}

.modal-subtitle {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.modal-options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.modal-os-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  transition: var(--transition-smooth);
  cursor: pointer;
  text-align: left;
}

.modal-os-card:hover {
  border-color: var(--cyan-neon);
  background: var(--bg-card-hover);
}

.modal-os-card.highlight {
  border-color: var(--cyan-neon);
  background: rgba(0, 229, 221, 0.08);
}

.modal-os-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  color: var(--primary-blue);
}

.modal-os-card:hover .modal-os-icon {
  color: var(--cyan-neon);
}

.modal-os-name {
  font-size: 1rem;
  font-weight: 700;
  color: #FFFFFF;
}

.modal-os-info {
  font-size: 0.78rem;
  color: var(--text-dim);
}

.modal-footer-notice {
  margin-top: 24px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 16px;
}

/* Toast Message */
.toast-notice {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: #18243A;
  border: 1px solid var(--cyan-neon);
  color: #FFFFFF;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 0.9rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  z-index: 3000;
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
}

.toast-notice.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ==========================================================================
   Sub-pages Specific (下载页、定价页、功能页、帮助页等)
   ========================================================================== */
.subpage-hero {
  padding-top: calc(var(--header-height) + 64px);
  padding-bottom: 48px;
  text-align: center;
  background: radial-gradient(circle at 50% 20%, rgba(22, 139, 255, 0.15) 0%, transparent 60%);
}

.subpage-content {
  padding-bottom: 80px;
}

.policy-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 40px;
  color: var(--text-muted);
  line-height: 1.8;
  max-width: 900px;
  margin: 0 auto;
}

.policy-card h2 {
  color: #FFFFFF;
  font-size: 1.4rem;
  margin: 32px 0 12px 0;
}

.policy-card h2:first-child {
  margin-top: 0;
}

.policy-card p {
  margin-bottom: 16px;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .hero-platforms {
    justify-content: center;
  }
  .hero-mockup-wrapper {
    max-width: 520px;
    margin: 0 auto;
  }
  .client-mockup-window {
    transform: none;
  }
  .feature-row {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .feature-row.reverse {
    direction: ltr;
  }
  .showcase-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .download-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }
  .pricing-card.highlight {
    transform: none;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-desktop {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2.5rem;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .showcase-grid {
    grid-template-columns: 1fr;
  }
  .modal-options-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .os-detected-banner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2.1rem;
  }
  .download-cards-grid {
    grid-template-columns: 1fr;
  }
  .section-title {
    font-size: 1.75rem;
  }
  .feature-row {
    padding: 24px;
  }
  .modal-content {
    padding: 24px 18px;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}