/* ==========================================================================
   3Shell 官方推广落地页 - 极客级全景真实界面设计系统
   Modern Cyberpunk & Glassmorphism Interactive Design System
   ========================================================================== */

:root {
  /* 品牌调色板 */
  --bg-dark: #06080d;
  --bg-surface: #0c101a;
  --bg-surface-elevated: #131926;
  --bg-card: rgba(16, 22, 36, 0.72);
  --bg-glass: rgba(10, 14, 24, 0.85);

  /* 点缀科技光色 */
  --primary: #38bdf8;
  --primary-hover: #7dd3fc;
  --primary-glow: rgba(56, 189, 248, 0.4);
  --indigo: #6366f1;
  --indigo-glow: rgba(99, 102, 241, 0.4);
  --emerald: #10b981;
  --emerald-glow: rgba(16, 185, 129, 0.35);
  --amber: #f59e0b;
  --rose: #f43f5e;
  --purple: #c084fc;

  /* 文字排版色彩 */
  --text-main: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-dim: #334155;

  /* 边框与光影 */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-bright: rgba(56, 189, 248, 0.35);
  --border-card-hover: rgba(56, 189, 248, 0.5);
  --shadow-card: 0 14px 40px -10px rgba(0, 0, 0, 0.7);
  --shadow-glow: 0 0 45px rgba(56, 189, 248, 0.22);

  /* 尺寸与圆角 */
  --max-width: 1260px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 9999px;

  /* 动画曲线 */
  --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background-color: var(--bg-dark);
  scroll-behavior: smooth;
  font-size: 16px;
  overflow-x: hidden;
}

body {
  line-height: 1.6;
  position: relative;
  overflow-x: hidden;
  min-height: 100vh;
  background: 
    radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.14) 0%, transparent 60%),
    radial-gradient(circle at 90% 18%, rgba(99, 102, 241, 0.12) 0%, transparent 50%),
    radial-gradient(circle at 10% 40%, rgba(16, 185, 129, 0.08) 0%, transparent 45%),
    var(--bg-dark);
}

/* 全局科技网格背景纹理 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  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);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

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

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

ul {
  list-style: none;
}

img, svg {
  vertical-align: middle;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ================= 顶部导航栏 ================= */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: rgba(6, 8, 13, 0.85);
  border-bottom: 1px solid var(--border-subtle);
  transition: all 0.3s ease;
}

.site-header.scrolled {
  background: rgba(6, 8, 13, 0.96);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  border-bottom-color: rgba(56, 189, 248, 0.25);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  color: #fff;
}

.logo-icon-box {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #38bdf8 0%, #6366f1 100%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px var(--primary-glow);
  position: relative;
  overflow: hidden;
}

.logo-icon-box::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  animation: shine 4s infinite;
}

.logo-text-group {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-weight: 800;
  font-size: 1.18rem;
  line-height: 1.1;
  background: linear-gradient(120deg, #ffffff 40%, #7dd3fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-sub {
  font-size: 0.68rem;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
  position: relative;
  padding: 6px 2px;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: all 0.25s var(--ease-smooth);
  transform: translateX(-50%);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.nav-btn-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 20px;
  background: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  color: #031024;
  font-weight: 700;
  font-size: 0.88rem;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 18px rgba(56, 189, 248, 0.4);
  transition: all 0.25s var(--ease-smooth);
}

.nav-btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(56, 189, 248, 0.6);
  filter: brightness(1.08);
}

/* 移动端汉堡按钮 */
.mobile-toggle-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: #fff;
}

.mobile-toggle-btn span {
  width: 20px;
  height: 2px;
  background-color: var(--text-main);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.mobile-toggle-btn.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-toggle-btn.open span:nth-child(2) {
  opacity: 0;
  transform: translateX(10px);
}
.mobile-toggle-btn.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 移动端全屏抽屉 */
.mobile-menu-drawer {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  width: 100%;
  height: calc(100vh - 72px);
  background: rgba(6, 8, 13, 0.98);
  backdrop-filter: blur(20px);
  padding: 30px 24px;
  flex-direction: column;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  z-index: 99;
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition: all 0.35s var(--ease-smooth);
}

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

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mobile-nav-item a {
  font-size: 1.12rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.mobile-nav-item a:hover {
  color: var(--primary);
  background: rgba(56, 189, 248, 0.08);
  border-color: rgba(56, 189, 248, 0.25);
}

/* ================= Hero 区域 ================= */
.hero-section {
  padding: 65px 0 30px;
  text-align: center;
  position: relative;
}

.hero-glow-blob {
  position: absolute;
  top: 15%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 700px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(56, 189, 248, 0.22) 0%, rgba(99, 102, 241, 0.16) 45%, transparent 70%);
  filter: blur(90px);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-pill);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 24px;
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.15);
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 8px var(--primary);
  animation: pulseDot 2s infinite;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 4.1rem);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.03em;
  margin-bottom: 22px;
}

.gradient-text {
  background: linear-gradient(135deg, #ffffff 20%, #38bdf8 65%, #818cf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: clamp(1rem, 2vw, 1.22rem);
  color: var(--text-secondary);
  max-width: 800px;
  margin: 0 auto 38px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 45px;
}

.btn-primary-glow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 34px;
  background: linear-gradient(135deg, #38bdf8 0%, #2563eb 100%);
  color: #fff;
  font-weight: 700;
  font-size: 1.02rem;
  border-radius: var(--radius-md);
  box-shadow: 0 6px 28px rgba(56, 189, 248, 0.45);
  transition: all 0.3s var(--ease-smooth);
}

.btn-primary-glow:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 10px 36px rgba(56, 189, 248, 0.65);
}

.btn-secondary-glass {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  font-weight: 600;
  font-size: 1.02rem;
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.btn-secondary-glass:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-3px);
}

/* 全平台快速直达芯片栏 */
.hero-platform-chips {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin: 22px auto 35px;
}

.chips-label {
  font-size: 0.84rem;
  color: var(--text-muted);
  font-weight: 500;
}

.platform-chip-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 15px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  color: var(--text-secondary);
  transition: all 0.25s ease;
  backdrop-filter: blur(8px);
  text-decoration: none;
}

.platform-chip-link:hover {
  background: rgba(56, 189, 248, 0.12);
  border-color: rgba(56, 189, 248, 0.4);
  color: #fff;
  transform: translateY(-2px);
}

.platform-chip-link.active {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--primary);
  color: var(--primary);
}

/* ================= Hero 真实应用界面大画幅悬浮展示 ================= */
.hero-screen-showcase {
  margin: 10px auto 40px;
  max-width: 1140px;
  position: relative;
}

.hero-screen-frame {
  background: #080c14;
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-lg);
  box-shadow: 0 25px 80px -15px rgba(0, 0, 0, 0.85), var(--shadow-glow);
  overflow: hidden;
  position: relative;
  transition: transform 0.4s var(--ease-smooth);
}

.hero-screen-frame:hover {
  transform: translateY(-4px);
}

.frame-topbar {
  background: #0e1422;
  padding: 10px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.frame-dots {
  display: flex;
  gap: 7px;
}

.f-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.f-dot.red { background: #ef4444; }
.f-dot.yellow { background: #f59e0b; }
.f-dot.green { background: #10b981; }

.frame-title {
  font-size: 0.82rem;
  color: #94a3b8;
  font-family: 'Cascadia Code', monospace;
  display: flex;
  align-items: center;
  gap: 8px;
}

.frame-img-box {
  width: 100%;
  line-height: 0;
  background: #06080d;
  position: relative;
  cursor: pointer;
}

.frame-img-box img {
  width: 100%;
  height: auto;
  display: block;
  transition: filter 0.3s ease;
}

.frame-zoom-hint {
  position: absolute;
  bottom: 18px;
  right: 20px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  font-size: 0.78rem;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 6px;
  pointer-events: none;
  opacity: 0.85;
  transition: opacity 0.2s;
}

.frame-img-box:hover .frame-zoom-hint {
  opacity: 1;
}

/* 核心背书指标栏 */
.hero-metrics-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 980px;
  margin: 30px auto 0;
  padding: 18px 24px;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.metric-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.metric-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
  font-family: 'Cascadia Code', Consolas, monospace;
}

.metric-num span {
  color: var(--primary);
}

.metric-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ================= 真实界面交互画廊 (Real Screen Gallery) ================= */
.real-gallery-section {
  padding: 80px 0 90px;
  position: relative;
}

.section-head {
  text-align: center;
  margin-bottom: 45px;
}

.section-tag {
  text-transform: uppercase;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--primary);
  margin-bottom: 8px;
  display: block;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 12px;
}

.section-sub {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 680px;
  margin: 0 auto;
}

/* 截图导航 Tabs */
.gallery-tabs-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.g-tab-btn {
  padding: 9px 20px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  transition: all 0.25s var(--ease-smooth);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.g-tab-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  transform: translateY(-1px);
}

.g-tab-btn.active {
  background: rgba(56, 189, 248, 0.16);
  color: var(--primary);
  border-color: rgba(56, 189, 248, 0.45);
  box-shadow: 0 0 18px rgba(56, 189, 248, 0.25);
}

/* 展台主体：左右两栏卡片 */
.gallery-showcase-card {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px);
  align-items: center;
}

/* 截图展示区 */
.gallery-image-viewport {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.6);
  background: #05070c;
  position: relative;
  cursor: pointer;
  group: true;
}

.gallery-image-viewport img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.4s var(--ease-smooth);
}

.gallery-image-viewport:hover img {
  transform: scale(1.015);
}

.gallery-image-overlay {
  position: absolute;
  inset: 0;
  background: rgba(3, 7, 18, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.gallery-image-viewport:hover .gallery-image-overlay {
  opacity: 1;
}

.zoom-badge {
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  background: rgba(14, 19, 31, 0.9);
  border: 1px solid var(--primary);
  color: var(--primary);
  font-size: 0.84rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.4);
}

/* 展台右侧亮点深度解读区 */
.gallery-info-pane {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.gallery-tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.gallery-title {
  font-size: 1.7rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.25;
}

.gallery-desc {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.gallery-feature-points {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 6px;
}

.g-point-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.g-point-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(56, 189, 248, 0.12);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  flex-shrink: 0;
  margin-top: 2px;
}

.g-point-text {
  font-size: 0.92rem;
  color: #cbd5e1;
  line-height: 1.5;
}

.g-point-text strong {
  color: #fff;
}

.gallery-micro-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.g-chip {
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.78rem;
  color: var(--text-secondary);
}

/* ================= 六大颠覆性特性矩阵 (Features) ================= */
.features-section {
  padding: 70px 0;
  position: relative;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  transition: all 0.35s var(--ease-smooth);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-card-hover);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

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

.feat-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feat-icon-wrapper.cyan {
  background: rgba(56, 189, 248, 0.12);
  color: var(--primary);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.feat-icon-wrapper.indigo {
  background: rgba(99, 102, 241, 0.12);
  color: var(--indigo);
  border: 1px solid rgba(99, 102, 241, 0.25);
}

.feat-icon-wrapper.emerald {
  background: rgba(16, 185, 129, 0.12);
  color: var(--emerald);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.feat-icon-wrapper.amber {
  background: rgba(245, 158, 11, 0.12);
  color: var(--amber);
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.feat-icon-wrapper.rose {
  background: rgba(244, 63, 94, 0.12);
  color: var(--rose);
  border: 1px solid rgba(244, 63, 94, 0.25);
}

.feat-title {
  font-size: 1.22rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}

.feat-desc {
  color: var(--text-secondary);
  font-size: 0.93rem;
  line-height: 1.65;
}

.feat-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.feat-micro-tag {
  font-size: 0.74rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
}

/* ================= 竞品硬核横向对比 (Comparison Table) ================= */
.comparison-section {
  padding: 80px 0;
  background: linear-gradient(180deg, transparent, rgba(12, 16, 26, 0.5) 50%, transparent);
}

.table-responsive-wrapper {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 680px;
}

.compare-table th, .compare-table td {
  padding: 18px 22px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.compare-table th {
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.compare-table th.highlight-col, .compare-table td.highlight-col {
  background: rgba(56, 189, 248, 0.05);
  color: #fff;
  border-left: 1px solid rgba(56, 189, 248, 0.15);
  border-right: 1px solid rgba(56, 189, 248, 0.15);
}

.compare-table td {
  font-size: 0.94rem;
  color: var(--text-secondary);
}

.badge-yes {
  color: #10b981;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.badge-no {
  color: #64748b;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ================= 专属下载中心 (Download Center) ================= */
.download-section {
  padding: 80px 0 100px;
  position: relative;
}

/* 操作系统切换 Tab 导航 (科技毛玻璃) */
.download-os-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  max-width: 780px;
  margin: 0 auto 20px;
  padding: 6px;
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  backdrop-filter: blur(16px);
}

.os-tab-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 18px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.os-tab-btn:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
}

.os-tab-btn.active {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.2) 0%, rgba(37, 99, 235, 0.25) 100%);
  border-color: rgba(56, 189, 248, 0.5);
  color: #fff;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.4), inset 0 0 12px rgba(56, 189, 248, 0.15);
}

.os-tag-badge {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
  font-weight: 500;
}

.os-tab-btn.active .os-tag-badge {
  background: rgba(56, 189, 248, 0.25);
  color: #38bdf8;
}

.os-detect-hint {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.os-detect-hint span {
  display: inline-block;
  padding: 4px 16px;
  background: rgba(56, 189, 248, 0.06);
  border: 1px solid rgba(56, 189, 248, 0.15);
  border-radius: var(--radius-pill);
  color: #7dd3fc;
}

/* 平台内容面板切换 */
.os-panel {
  display: none;
}

.os-panel.active {
  display: block;
  animation: panelFadeIn 0.35s ease;
}

@keyframes panelFadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mac-tip-box {
  max-width: 900px;
  margin: 28px auto 0;
  padding: 14px 20px;
  background: rgba(168, 85, 247, 0.05);
  border: 1px solid rgba(168, 85, 247, 0.2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.mac-tip-box code {
  background: rgba(0, 0, 0, 0.4);
  padding: 2px 7px;
  border-radius: 4px;
  font-family: 'Cascadia Code', monospace;
  color: #38bdf8;
}

.download-cards-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  max-width: 900px;
  margin: 0 auto;
}

.download-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 38px 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  transition: all 0.35s var(--ease-smooth);
}

.download-card.popular {
  border-color: rgba(56, 189, 248, 0.4);
  background: linear-gradient(145deg, rgba(14, 25, 48, 0.8) 0%, rgba(12, 16, 26, 0.8) 100%);
  box-shadow: 0 15px 40px -10px rgba(0, 0, 0, 0.6), var(--shadow-glow);
}

.popular-ribbon {
  position: absolute;
  top: 18px;
  right: -32px;
  background: linear-gradient(90deg, #38bdf8, #2563eb);
  color: #031024;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 4px 38px;
  transform: rotate(45deg);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  text-transform: uppercase;
}

.dl-card-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.dl-os-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(56, 189, 248, 0.12);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.dl-title-box h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
}

.dl-version-tag {
  font-size: 0.78rem;
  color: var(--primary);
  font-weight: 600;
}

.dl-features-list {
  margin: 20px 0 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.dl-features-list li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.dl-features-list li svg {
  color: #10b981;
  flex-shrink: 0;
}

.dl-btn-action {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 1.02rem;
  transition: all 0.25s ease;
  text-align: center;
}

.dl-btn-action.primary {
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
  color: #031024;
  box-shadow: 0 4px 20px rgba(56, 189, 248, 0.4);
}

.dl-btn-action.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(56, 189, 248, 0.6);
}

.dl-btn-action.secondary {
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
  border: 1px solid var(--border-subtle);
}

.dl-btn-action.secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

.dl-meta-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 14px;
}

.sha256-box {
  margin-top: 36px;
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.sha256-code {
  font-family: 'Cascadia Code', Consolas, monospace;
  color: #38bdf8;
  word-break: break-all;
}

.copy-sha-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-secondary);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  white-space: nowrap;
  transition: all 0.2s;
}

.copy-sha-btn:hover {
  color: #fff;
  border-color: var(--primary);
}

/* ================= 常见问答 FAQ ================= */
.faq-section {
  padding: 60px 0 90px;
}

.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s;
}

.faq-item.active {
  border-color: rgba(56, 189, 248, 0.35);
}

.faq-question {
  width: 100%;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  text-align: left;
}

.faq-arrow {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-arrow {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s var(--ease-smooth);
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.94rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  padding-bottom: 20px;
}

/* ================= 底部 CTA 横幅 ================= */
.bottom-cta-banner {
  margin: 40px auto 70px;
  padding: 54px 40px;
  background: linear-gradient(135deg, rgba(14, 25, 48, 0.9) 0%, rgba(20, 18, 45, 0.9) 100%);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 50px -10px rgba(0, 0, 0, 0.7), var(--shadow-glow);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.bottom-cta-title {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 14px;
}

.bottom-cta-sub {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto 30px;
}

/* ================= 页脚 Footer ================= */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: #04060a;
  padding: 50px 0 30px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 30px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

.footer-link {
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.footer-link:hover {
  color: var(--primary);
}

/* ================= 高清全屏灯箱放大遮罩 (Lightbox Modal) ================= */
.lightbox-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(3, 5, 10, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.lightbox-modal.open {
  display: flex;
  opacity: 1;
}

.lightbox-content {
  max-width: 95vw;
  max-height: 90vh;
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 25px 80px rgba(0, 0, 0, 0.9), 0 0 50px rgba(56, 189, 248, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.lightbox-content img {
  width: auto;
  max-width: 100%;
  max-height: 86vh;
  display: block;
  object-fit: contain;
}

.lightbox-close-btn {
  position: absolute;
  top: 16px;
  right: 20px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 1010;
  transition: all 0.2s;
}

.lightbox-close-btn:hover {
  background: rgba(239, 68, 68, 0.8);
  transform: scale(1.08);
}

/* ================= 手机端吸底快速下载条 ================= */
.mobile-sticky-download {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: rgba(10, 14, 24, 0.96);
  backdrop-filter: blur(16px);
  border-top: 1px solid rgba(56, 189, 248, 0.25);
  padding: 10px 16px;
  z-index: 90;
  box-shadow: 0 -8px 24px rgba(0, 0, 0, 0.6);
  justify-content: space-between;
  align-items: center;
}

.sticky-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.sticky-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: #fff;
}

.sticky-sub {
  font-size: 0.72rem;
  color: var(--primary);
}

.sticky-btn {
  padding: 8px 18px;
  background: linear-gradient(135deg, #38bdf8 0%, #2563eb 100%);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
  border-radius: var(--radius-pill);
  box-shadow: 0 2px 10px rgba(56, 189, 248, 0.4);
}

/* 关键帧动画 */
@keyframes pulseDot {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 8px rgba(56, 189, 248, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(56, 189, 248, 0); }
}

@keyframes shine {
  0% { left: -100%; }
  20% { left: 100%; }
  100% { left: 100%; }
}

/* ================= 响应式断点适配 ================= */
@media (max-width: 1024px) {
  .gallery-showcase-card {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 24px;
  }
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-metrics-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (max-width: 768px) {
  html, body {
    overflow-x: hidden !important;
    width: 100%;
    position: relative;
  }

  .container {
    padding: 0 16px;
    max-width: 100%;
    box-sizing: border-box;
  }

  .nav-links, .nav-actions {
    display: none;
  }
  .mobile-toggle-btn {
    display: flex;
  }
  .mobile-menu-drawer {
    display: flex;
  }
  .mobile-sticky-download {
    display: flex;
  }

  .hero-section {
    padding: 40px 0 35px;
  }
  .hero-title {
    font-size: 2.15rem;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .btn-primary-glow, .btn-secondary-glass {
    width: 100%;
    justify-content: center;
  }

  .hero-screen-showcase {
    margin: 20px auto;
  }
  .frame-zoom-hint {
    display: none;
  }

  .gallery-tabs-nav {
    gap: 8px;
  }
  .g-tab-btn {
    font-size: 0.8rem;
    padding: 7px 14px;
  }

  .hero-metrics-bar {
    grid-template-columns: 1fr 1fr;
    padding: 14px;
    gap: 14px;
  }
  .metric-num {
    font-size: 1.45rem;
  }

  .feature-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .feature-card {
    padding: 24px 20px;
  }

  .download-cards-container {
    grid-template-columns: 1fr;
    gap: 22px;
  }
  .download-card {
    padding: 30px 22px;
  }

  /* 操作系统选择 Tab 导航 (移动端自适应与平滑横滑，防止边缘截断遮挡) */
  .download-os-tabs {
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 8px;
    padding: 5px 8px;
    margin: 0 auto 16px;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-x: contain;
    -ms-overflow-style: none;
    scrollbar-width: none;
    border-radius: 9999px;
  }
  .download-os-tabs::-webkit-scrollbar {
    display: none;
  }
  .os-tab-btn {
    flex: 0 0 auto;
    padding: 8px 14px;
    font-size: 0.85rem;
    gap: 6px;
    border-radius: 9999px;
  }
  .os-tab-btn svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
  }
  .os-tag-badge {
    font-size: 0.65rem;
    padding: 2px 6px;
    border-radius: 8px;
  }
  .os-detect-hint {
    margin-bottom: 20px;
    padding: 0 8px;
  }
  .os-detect-hint span {
    display: inline-block;
    max-width: 100%;
    font-size: 0.76rem;
    padding: 5px 12px;
    line-height: 1.45;
    word-break: break-word;
    border-radius: 9999px;
  }

  .bottom-cta-banner {
    padding: 36px 20px;
    margin: 20px auto 50px;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }

  body {
    padding-bottom: 65px;
  }
}

@media (max-width: 480px) {
  .download-os-tabs {
    gap: 6px;
    padding: 4px 6px;
    margin-bottom: 14px;
  }
  .os-tab-btn {
    padding: 7px 11px;
    font-size: 0.8rem;
    gap: 5px;
  }
  .os-tab-btn svg {
    width: 15px;
    height: 15px;
  }
  .os-tag-badge {
    font-size: 0.6rem;
    padding: 1px 5px;
  }
  .section-title {
    font-size: 1.55rem;
    line-height: 1.25;
  }
  .section-sub {
    font-size: 0.86rem;
  }
}