/* ==========================================================================
   号本 (SIMs) - 静态官网与上架网关样式表
   Design System: Deep Obsidian Dark Mode + Neon Aurora Glow + Apple Glassmorphism
   ========================================================================== */

:root {
  --bg-main: #09090D;
  --bg-surface: rgba(22, 22, 30, 0.7);
  --bg-surface-hover: rgba(32, 32, 44, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.04);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(255, 255, 255, 0.16);
  --border-active: rgba(168, 85, 247, 0.45);

  --text-primary: #FFFFFF;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --text-dim: #475569;

  --accent-pink: #F43F5E;
  --accent-fuchsia: #D946EF;
  --accent-purple: #8B5CF6;
  --accent-indigo: #6366F1;
  --accent-cyan: #06B6D4;
  --accent-emerald: #10B981;

  --gradient-aurora: linear-gradient(135deg, #FF5E62 0%, #D946EF 45%, #8B5CF6 100%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.06) 0%, rgba(255, 255, 255, 0.01) 100%);
  --gradient-btn: linear-gradient(135deg, #FF6080 0%, #B845ED 50%, #6366F1 100%);

  --shadow-subtle: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --shadow-card: 0 20px 40px -15px rgba(0, 0, 0, 0.7), 0 0 0 1px var(--border-subtle);
  --shadow-glow: 0 0 60px -15px rgba(217, 70, 239, 0.25);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", Menlo, Monaco, Consolas, monospace;

  --container-width: 1180px;
  --transition-smooth: all 0.3s 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-sans);
  background-color: var(--bg-main);
  color: var(--text-primary);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  background-color: var(--bg-main);
  background-image: 
    radial-gradient(circle at 50% -10%, rgba(217, 70, 239, 0.15), transparent 45%),
    radial-gradient(circle at 15% 30%, rgba(99, 102, 241, 0.12), transparent 40%),
    radial-gradient(circle at 85% 65%, rgba(244, 63, 94, 0.10), transparent 45%);
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-smooth);
}

img {
  max-width: 100%;
  display: block;
  user-select: none;
}

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

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

/* ==========================================================================
   导航栏 Header & Navbar
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(9, 9, 13, 0.72);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition-smooth);
}

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

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

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(217, 70, 239, 0.3);
  object-fit: cover;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-sub {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
}

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

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  background: var(--bg-surface);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.nav-cta:hover {
  border-color: var(--accent-fuchsia);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(217, 70, 239, 0.25);
}

/* ==========================================================================
   Hero 头部主视觉
   ========================================================================== */
.hero-section {
  padding-top: 150px;
  padding-bottom: 80px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  color: #E2E8F0;
  margin-bottom: 24px;
}

.pill-dot {
  width: 7px;
  height: 7px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-emerald);
}

.hero-title {
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.035em;
  margin-bottom: 24px;
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
}

.gradient-text {
  background: var(--gradient-aurora);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-description {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 660px;
  margin: 0 auto 36px;
  font-weight: 400;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: var(--gradient-btn);
  color: #FFFFFF;
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-full);
  box-shadow: 0 8px 24px rgba(217, 70, 239, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(217, 70, 239, 0.5);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-highlight);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-full);
  backdrop-filter: blur(10px);
}

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

.hero-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.badge-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.badge-item svg {
  color: var(--accent-fuchsia);
}

/* ==========================================================================
   交互式截图画廊 (Showcase Section)
   ========================================================================== */
.showcase-section {
  padding: 50px 0 100px;
}

.showcase-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-fuchsia);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* 截图导航 Tabs */
.showcase-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 600;
  transition: var(--transition-smooth);
}

.tab-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}

.tab-btn.active {
  background: rgba(217, 70, 239, 0.15);
  border-color: var(--border-active);
  color: #FFFFFF;
  box-shadow: 0 0 20px rgba(217, 70, 239, 0.2);
}

/* 截图展示舞台 */
.showcase-stage {
  max-width: 980px;
  margin: 0 auto;
  position: relative;
  background: radial-gradient(circle at center, rgba(217, 70, 239, 0.12), transparent 70%);
  border-radius: var(--radius-xl);
  padding: 30px;
  border: 1px solid var(--border-subtle);
}

.screen-display-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.8), 0 0 40px -10px rgba(217, 70, 239, 0.3);
  transition: var(--transition-smooth);
}

.screen-item {
  display: none;
  width: 100%;
  animation: fadeIn 0.4s ease forwards;
}

.screen-item.active {
  display: block;
}

.screen-item img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
}

.screen-caption {
  margin-top: 24px;
  text-align: center;
}

.caption-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.caption-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: scale(0.985);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ==========================================================================
   功能特性网格 (Feature Bento Grid)
   ========================================================================== */
.features-section {
  padding: 80px 0;
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
  margin-top: 50px;
}

.bento-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  position: relative;
  overflow: hidden;
  transition: var(--transition-smooth);
}

.bento-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
}

.bento-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-highlight);
  box-shadow: 0 15px 35px -10px rgba(0, 0, 0, 0.6);
}

.col-7 { grid-column: span 7; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-12 { grid-column: span 12; }

.bento-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 22px;
  color: var(--accent-fuchsia);
}

.bento-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.bento-desc {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.bento-tag-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.bento-tag {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--text-muted);
}

/* ==========================================================================
   安全与隐私横幅 (Privacy Callout)
   ========================================================================== */
.privacy-callout-section {
  padding: 60px 0;
}

.callout-box {
  background: linear-gradient(135deg, rgba(30, 27, 46, 0.8) 0%, rgba(18, 16, 28, 0.9) 100%);
  border: 1px solid rgba(168, 85, 247, 0.25);
  border-radius: var(--radius-xl);
  padding: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  box-shadow: 0 20px 50px -15px rgba(0, 0, 0, 0.7);
  position: relative;
  overflow: hidden;
}

.callout-box::after {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, rgba(217, 70, 239, 0.15), transparent 70%);
  pointer-events: none;
}

.callout-content {
  max-width: 650px;
}

.callout-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-emerald);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.callout-title {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.callout-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.callout-btn {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  color: #FFFFFF;
}

.callout-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--text-primary);
}

/* ==========================================================================
   常见问题 FAQ
   ========================================================================== */
.faq-section {
  padding: 80px 0;
}

.faq-list {
  max-width: 800px;
  margin: 40px auto 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-smooth);
}

.faq-item:hover {
  border-color: var(--border-highlight);
}

.faq-question {
  width: 100%;
  padding: 22px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
}

.faq-icon {
  font-size: 1.2rem;
  color: var(--text-muted);
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--accent-fuchsia);
}

.faq-answer {
  display: none;
  padding: 0 24px 22px;
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.faq-item.active .faq-answer {
  display: block;
  animation: fadeIn 0.3s ease;
}

/* ==========================================================================
   下载与转化 CTA 区域
   ========================================================================== */
.cta-section {
  padding: 100px 0;
  text-align: center;
}

.cta-card {
  background: radial-gradient(circle at 50% 0%, rgba(217, 70, 239, 0.25), transparent 70%), var(--bg-surface);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-xl);
  padding: 70px 30px;
  max-width: 900px;
  margin: 0 auto;
  box-shadow: var(--shadow-glow);
  position: relative;
}

.cta-app-icon {
  width: 80px;
  height: 80px;
  border-radius: 20px;
  margin: 0 auto 24px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 0 25px rgba(217, 70, 239, 0.4);
}

.cta-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.cta-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin: 0 auto 36px;
}

/* ==========================================================================
   法律与文档页样式 (privacy.html, support.html, terms.html)
   ========================================================================== */
.legal-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 140px 24px 100px;
}

.legal-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.legal-meta {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.legal-article {
  color: #CBD5E1;
  font-size: 1.02rem;
  line-height: 1.8;
}

.legal-article h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 40px;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.legal-article h3 {
  font-size: 1.18rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 24px;
  margin-bottom: 10px;
}

.legal-article p {
  margin-bottom: 18px;
}

.legal-article ul {
  padding-left: 24px;
  margin-bottom: 20px;
}

.legal-article li {
  margin-bottom: 10px;
}

.legal-highlight-box {
  background: rgba(255, 255, 255, 0.04);
  border-left: 4px solid var(--accent-fuchsia);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 18px 22px;
  margin: 24px 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.support-contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin: 30px 0 40px;
}

.contact-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.contact-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
}

.contact-value {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* ==========================================================================
   页脚 Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: #060608;
  padding: 60px 0 40px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.footer-brand {
  max-width: 320px;
}

.footer-nav-group {
  display: flex;
  gap: 60px;
  flex-wrap: wrap;
}

.footer-col-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 16px;
}

/* ==========================================================================
   移动端与响应式适配
   ========================================================================== */
@media (max-width: 900px) {
  .bento-grid {
    grid-template-columns: 1fr;
  }
  .col-7, .col-5, .col-6, .col-12 {
    grid-column: span 1;
  }
  .callout-box {
    flex-direction: column;
    align-items: flex-start;
    padding: 32px;
  }
  .showcase-stage {
    padding: 16px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .hero-section {
    padding-top: 120px;
    padding-bottom: 50px;
  }
  .showcase-tabs {
    gap: 6px;
  }
  .tab-btn {
    padding: 8px 14px;
    font-size: 0.85rem;
  }
  .footer-top {
    flex-direction: column;
  }
  .footer-nav-group {
    gap: 36px;
  }
}

/* 语言切换按钮 */
.lang-switch-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.lang-switch-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
  border-color: var(--border-highlight);
  transform: translateY(-1px);
}