/* ==========================================================================
   BiuBiu 官方推广落地页 - 街头机能潮流风格核心样式表 (style.css)
   STREETWEAR NEO-POP KINETIC STICKER UI DESIGN FOR "BIUBIU"
   High-Voltage Urban Palette: Pitch Asphalt Black, Volt Green (#ccff00),
   Spray-paint White & Holographic Chrome.
   ========================================================================== */

/* ---------------- 基础色彩变量体系 ---------------- */
:root {
  /* 默认白天模式 (High-Contrast Concrete Streetwear 浅泥灰白+硬朗工装黑) */
  --bg-pitch: #f4f5f8;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #fafafa;
  --bg-elevated: #e9ecef;
  
  --text-main: #0a0a0c;
  --text-secondary: #3f3f46;
  --text-muted: #71717a;
  
  /* 街头高压伏特绿核心与高对比点缀 */
  --volt-green: #a3e635; /* 白天模式下稍加饱和以保对比度 */
  --volt-green-raw: #ccff00;
  --volt-glow: rgba(163, 230, 53, 0.35);
  --volt-border: #0a0a0c;
  
  --chrome-1: #00f0ff;
  --chrome-2: #ff007a;
  --chrome-3: #ccff00;
  --chrome-gradient: linear-gradient(135deg, #ccff00 0%, #00f0ff 50%, #ff007a 100%);
  --hologram-shimmer: linear-gradient(115deg, transparent 20%, rgba(204,255,0,0.15) 40%, rgba(0,240,255,0.25) 50%, rgba(255,0,122,0.18) 60%, transparent 80%);

  --hazard-border: repeating-linear-gradient(-45deg, #0a0a0c, #0a0a0c 10px, #a3e635 10px, #a3e635 20px);
  --hazard-subtle: repeating-linear-gradient(-45deg, rgba(10,10,12,0.06), rgba(10,10,12,0.06) 8px, transparent 8px, transparent 16px);
  
  --border-strong: #0a0a0c;
  --border-card: 2px solid #0a0a0c;
  --shadow-brutal: 5px 5px 0px #0a0a0c;
  --shadow-brutal-lg: 8px 8px 0px #0a0a0c;
  --shadow-brutal-volt: 6px 6px 0px #a3e635;

  --font-display: "Impact", "Arial Black", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Courier, monospace;
  --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  
  --nav-height: 76px;
  --transition-fast: 0.18s cubic-bezier(0.2, 0, 0, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------------- 夜间暗黑模式 (Pitch Asphalt Black + Hyper-Acid Safety Volt Green) ---------------- */
[data-theme="dark"] {
  --bg-pitch: #0a0a0c;
  --bg-surface: #121217;
  --bg-card: #14141b;
  --bg-card-hover: #1b1b24;
  --bg-elevated: #22222d;
  
  --text-main: #f4f5f8;
  --text-secondary: #a1a1aa;
  --text-muted: #52525b;
  
  --volt-green: #ccff00;
  --volt-glow: rgba(204, 255, 0, 0.4);
  --volt-border: #ccff00;
  
  --border-strong: #272732;
  --border-card: 2px solid #272732;
  --shadow-brutal: 5px 5px 0px #ccff00;
  --shadow-brutal-lg: 8px 8px 0px #ccff00;
  --shadow-brutal-volt: 6px 6px 0px #0a0a0c;
  
  --hazard-border: repeating-linear-gradient(-45deg, #0a0a0c, #0a0a0c 10px, #ccff00 10px, #ccff00 20px);
  --hazard-subtle: repeating-linear-gradient(-45deg, rgba(204,255,0,0.08), rgba(204,255,0,0.08) 8px, transparent 8px, transparent 16px);
}

/* ---------------- 基础排版与重置 ---------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 24px);
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-pitch);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

/* 工业背景暗纹 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: radial-gradient(var(--border-strong) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.12;
  pointer-events: none;
  z-index: -2;
}

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

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

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------------- 战术动态准星 (Acoustic Crosshair) ---------------- */
.tactical-crosshair {
  position: fixed;
  width: 36px;
  height: 36px;
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 9999;
  transition: width 0.15s ease, height 0.15s ease, opacity 0.2s ease;
  display: none; /* 移动端触屏默认不显示，仅由 JS 在鼠标移动时唤醒 */
}

@media (pointer: fine) {
  .tactical-crosshair {
    display: block;
  }
}

.crosshair-ring {
  position: absolute;
  inset: 0;
  border: 1.5px dashed var(--volt-green);
  border-radius: 50%;
  animation: radarSpin 12s linear infinite;
  opacity: 0.85;
}

.crosshair-dot {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 4px;
  height: 4px;
  background-color: var(--volt-green);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 8px var(--volt-green);
}

.crosshair-axis-x, .crosshair-axis-y {
  position: absolute;
  background: var(--volt-green);
  opacity: 0.7;
}

.crosshair-axis-x {
  top: 50%;
  left: -8px;
  right: -8px;
  height: 1px;
  transform: translateY(-50%);
}

.crosshair-axis-y {
  left: 50%;
  top: -8px;
  bottom: -8px;
  width: 1px;
  transform: translateX(-50%);
}

.crosshair-sonar {
  position: absolute;
  inset: -12px;
  border-radius: 50%;
  border: 1px solid var(--volt-green);
  opacity: 0;
  pointer-events: none;
}

.crosshair-sonar.ping {
  animation: sonarPing 0.65s cubic-bezier(0, 0, 0.2, 1) forwards;
}

@keyframes radarSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes sonarPing {
  0% { transform: scale(0.6); opacity: 0.9; }
  100% { transform: scale(2.4); opacity: 0; }
}

/* ---------------- 顶部导航栏 (Asymmetric Brutalist Header) ---------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(244, 245, 248, 0.92);
  border-bottom: 2px solid var(--border-strong);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  z-index: 1000;
  transition: background-color var(--transition-smooth), border-color var(--transition-smooth);
}

[data-theme="dark"] .site-header {
  background: rgba(10, 10, 12, 0.92);
  border-bottom: 2px solid #272732;
}

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

/* 品牌 Logo: 街头模版喷绘风格 */
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 1.7rem;
  letter-spacing: -0.5px;
  font-weight: 900;
  text-transform: uppercase;
}

.brand-sticker-wrap {
  position: relative;
  background: var(--volt-green);
  color: #0a0a0c;
  padding: 4px 10px;
  border-radius: 4px;
  border: 2px solid #0a0a0c;
  box-shadow: 2px 2px 0px #0a0a0c;
  transform: rotate(-3deg);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: transform var(--transition-fast);
}

.brand-logo:hover .brand-sticker-wrap {
  transform: rotate(0deg) scale(1.05);
}

.brand-serial {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 1px;
}

/* 导航链接目录 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 4px;
  position: relative;
  transition: all var(--transition-fast);
  text-transform: uppercase;
}

.nav-link:hover {
  color: var(--text-main);
  background: rgba(204, 255, 0, 0.2);
}

.nav-link.active-link {
  color: #0a0a0c;
  background: var(--volt-green);
  border: 1px solid #0a0a0c;
}

[data-theme="dark"] .nav-link.active-link {
  color: #0a0a0c;
  background: var(--volt-green);
}

/* 推荐资讯高能胶带高亮标签 */
.nav-link-news {
  position: relative;
  background: #0a0a0c;
  color: var(--volt-green) !important;
  border: 1px dashed var(--volt-green);
}

[data-theme="dark"] .nav-link-news {
  background: #1e1e28;
  color: var(--volt-green) !important;
}

.nav-link-news::after {
  content: "HOT";
  position: absolute;
  top: -8px;
  right: -6px;
  background: #ff0055;
  color: #fff;
  font-size: 0.6rem;
  padding: 1px 4px;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-weight: 800;
  transform: rotate(6deg);
}

/* 右上角操作区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ---------------- 昼夜模式切换按钮 (精致透明机能质感) ---------------- */
.theme-toggle-btn {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  border: 2px solid var(--border-strong);
  background: var(--bg-surface);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  cursor: pointer;
  box-shadow: 2px 2px 0px var(--border-strong);
  transition: all var(--transition-fast);
  overflow: hidden;
}

.theme-toggle-btn:hover {
  background: var(--volt-green);
  color: #0a0a0c;
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0px #0a0a0c;
}

.theme-icon {
  width: 20px;
  height: 20px;
  position: absolute;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.25s ease;
}

.theme-icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.theme-icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.4);
}

[data-theme="dark"] .theme-icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.4);
}

[data-theme="dark"] .theme-icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* ---------------- 街头机能按扭 (CTA Buttons) ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: 6px;
  cursor: pointer;
  white-space: nowrap;
  position: relative;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--volt-green);
  color: #0a0a0c;
  border: 2px solid #0a0a0c;
  padding: 12px 26px;
  font-size: 0.95rem;
  box-shadow: 4px 4px 0px #0a0a0c;
}

.btn-primary:hover {
  background: #d9ff33;
  color: #0a0a0c;
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0px #0a0a0c;
}

[data-theme="dark"] .btn-primary {
  box-shadow: 4px 4px 0px #ccff00;
}

[data-theme="dark"] .btn-primary:hover {
  box-shadow: 6px 6px 0px #ffffff;
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-main);
  border: 2px solid var(--border-strong);
  padding: 12px 24px;
  font-size: 0.95rem;
  box-shadow: 4px 4px 0px var(--border-strong);
}

.btn-secondary:hover {
  background: var(--text-main);
  color: var(--bg-surface);
  transform: translate(-2px, -2px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
  box-shadow: 2px 2px 0px var(--border-strong);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
  box-shadow: 6px 6px 0px #0a0a0c;
}

.btn-block {
  width: 100%;
}

.btn-icon svg {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-fast);
}

.btn:hover .btn-icon svg {
  transform: translateX(4px);
}

/* ---------------- 警示胶带横幅 (Hazard Tape Banner) ---------------- */
.hazard-tape-bar {
  background: var(--hazard-border);
  height: 14px;
  width: 100%;
  border-top: 1px solid #0a0a0c;
  border-bottom: 1px solid #0a0a0c;
}

/* ---------------- 主视觉区 (Hero Section - Asymmetric Poster) ---------------- */
.hero-section {
  padding-top: calc(var(--nav-height) + 50px);
  padding-bottom: 80px;
  position: relative;
  overflow: hidden;
}

.hero-poster-frame {
  border: 3px solid var(--border-strong);
  background: var(--bg-surface);
  box-shadow: var(--shadow-brutal-lg);
  border-radius: 12px;
  padding: 50px 40px;
  position: relative;
  overflow: hidden;
}

/* 贴纸贴角装饰 */
.hero-poster-frame::before {
  content: "BIUBIU_CORE_v2.6 // ARMED";
  position: absolute;
  top: 14px;
  right: 20px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 2px;
}

.hero-meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: #0a0a0c;
  color: var(--volt-green);
  padding: 6px 14px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 800;
  margin-bottom: 24px;
  border: 1px solid var(--volt-green);
  box-shadow: 2px 2px 0px var(--volt-green);
  transform: rotate(-1deg);
}

.hero-meta-badge .status-ping {
  width: 8px;
  height: 8px;
  background: var(--volt-green);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--volt-green);
  animation: pulse 1.5s infinite ease-in-out;
}

/* 大标题：包含品牌名 BiuBiu */
.hero-headline {
  font-family: var(--font-display);
  font-size: 3.8rem;
  line-height: 1.08;
  letter-spacing: -1.5px;
  text-transform: uppercase;
  margin-bottom: 24px;
  color: var(--text-main);
}

.hero-headline .brand-highlight {
  background: var(--volt-green);
  color: #0a0a0c;
  padding: 0 12px;
  border: 2px solid #0a0a0c;
  display: inline-block;
  transform: skewX(-6deg);
  box-shadow: 4px 4px 0px #0a0a0c;
}

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

.hero-subheadline {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 780px;
  margin-bottom: 36px;
}

.hero-subheadline strong {
  color: var(--text-main);
  background: rgba(204, 255, 0, 0.25);
  padding: 2px 6px;
  border-radius: 2px;
}

.hero-actions-group {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 44px;
}

/* 战术状态条码与性能网格 */
.hero-telemetry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  border-top: 2px dashed var(--border-strong);
  padding-top: 30px;
}

.telemetry-item {
  background: var(--bg-card);
  border: 2px solid var(--border-strong);
  border-radius: 8px;
  padding: 16px;
  position: relative;
  transition: all var(--transition-fast);
}

.telemetry-item:hover {
  transform: translateY(-3px);
  border-color: var(--volt-green);
}

.telemetry-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  display: block;
  margin-bottom: 4px;
}

.telemetry-value {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1.1;
}

.telemetry-item:nth-child(1) .telemetry-value { color: var(--volt-green); }
.telemetry-item:nth-child(2) .telemetry-value { color: #00f0ff; }
.telemetry-item:nth-child(3) .telemetry-value { color: #ff007a; }

.telemetry-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ---------------- 模块通则与野兽派排版 ---------------- */
.section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  margin-bottom: 48px;
  position: relative;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--volt-green);
  background: #0a0a0c;
  padding: 4px 10px;
  display: inline-block;
  border: 1px solid var(--volt-green);
  margin-bottom: 12px;
  transform: rotate(-1deg);
}

.section-title {
  font-family: var(--font-display);
  font-size: 2.6rem;
  line-height: 1.15;
  letter-spacing: -1px;
  text-transform: uppercase;
  color: var(--text-main);
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 680px;
}

/* ---------------- 产品核心优势 (3个模切贴纸图文卡片) ---------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

/* 3D Corner Peel-Up Sticker Deformation & Hologram foil */
.sticker-card {
  background: var(--bg-surface);
  border: 2px solid var(--border-strong);
  border-radius: 12px;
  padding: 34px 28px;
  position: relative;
  box-shadow: var(--shadow-brutal);
  transition: transform 0.25s cubic-bezier(0.2, 0, 0, 1), box-shadow 0.25s ease;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* 全息反光扫光层 */
.sticker-card::before {
  content: "";
  position: absolute;
  inset: -100%;
  background: var(--hologram-shimmer);
  transform: rotate(35deg);
  opacity: 0;
  transition: opacity 0.4s ease, transform 0.6s ease;
  pointer-events: none;
}

.sticker-card:hover::before {
  opacity: 1;
  transform: rotate(35deg) translate(50%, 50%);
}

/* 3D 卷角撕开贴纸效果 (Corner Peel-up) */
.sticker-card::after {
  content: "";
  position: absolute;
  bottom: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 0 0 0;
  border-color: transparent transparent var(--border-strong) transparent;
  transition: border-width 0.25s ease;
  box-shadow: -2px -2px 5px rgba(0,0,0,0.2);
}

.sticker-card:hover::after {
  border-width: 0 0 28px 28px;
  border-color: transparent transparent var(--volt-green) transparent;
}

.sticker-card:hover {
  transform: translateY(-6px) rotate(0.5deg);
  box-shadow: var(--shadow-brutal-lg);
  border-color: var(--volt-green);
}

.sticker-badge-serial {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--border-strong);
}

.sticker-icon-box {
  width: 54px;
  height: 54px;
  background: #0a0a0c;
  color: var(--volt-green);
  border: 2px solid var(--volt-green);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  box-shadow: 3px 3px 0px var(--volt-green);
}

.sticker-icon-box svg {
  width: 28px;
  height: 28px;
}

.sticker-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
  color: var(--text-main);
}

.sticker-desc {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex-grow: 1;
}

.sticker-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.mini-sticker-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--bg-pitch);
  color: var(--text-main);
  border: 1px solid var(--border-strong);
  padding: 3px 8px;
  border-radius: 3px;
}

/* ---------------- 流媒体图卡 & AI 支持图卡 (街头机能无 Generic Bot) ---------------- */
.showcase-dual-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.tactical-media-card {
  background: var(--bg-surface);
  border: 2px solid var(--border-strong);
  border-radius: 12px;
  padding: 38px 32px;
  box-shadow: var(--shadow-brutal);
  position: relative;
  overflow: hidden;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.tactical-media-card:hover {
  transform: translateY(-5px);
  border-color: var(--volt-green);
  box-shadow: var(--shadow-brutal-lg);
}

.media-card-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 3px;
  display: inline-block;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.label-stream {
  background: #ff0055;
  color: #ffffff;
  border: 1px solid #0a0a0c;
}

.label-ai {
  background: var(--volt-green);
  color: #0a0a0c;
  border: 1px solid #0a0a0c;
}

.media-card-title {
  font-family: var(--font-display);
  font-size: 1.85rem;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
  color: var(--text-main);
}

.media-card-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 品牌贴纸方阵 (无通用 AI 机器人图标，硬核街头机能标志) */
.brand-stickers-wrap {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 26px 0;
}

.brand-sticker-pill {
  background: var(--bg-pitch);
  border: 1.5px solid var(--border-strong);
  border-radius: 6px;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--text-main);
  transition: all var(--transition-fast);
}

.brand-sticker-pill:hover {
  background: var(--volt-green);
  color: #0a0a0c;
  border-color: #0a0a0c;
  transform: scale(1.04) rotate(-1deg);
}

.brand-glyph {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 900;
  color: #fff;
  flex-shrink: 0;
}

.media-bullet-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border-top: 2px dashed var(--border-strong);
  padding-top: 18px;
}

.media-bullet-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.media-bullet-list svg {
  width: 18px;
  height: 18px;
  color: var(--volt-green);
  flex-shrink: 0;
}

/* ---------------- 真实套餐价格对比表 (Pricing) ---------------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.price-card {
  background: var(--bg-surface);
  border: 2px solid var(--border-strong);
  border-radius: 10px;
  padding: 32px 22px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-brutal);
  transition: all 0.25s ease;
}

.price-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-brutal-lg);
  border-color: var(--volt-green);
}

/* 推荐主推款 (爆款高亮) */
.price-card.featured {
  border: 3px solid var(--volt-green);
  box-shadow: 6px 6px 0px var(--volt-green);
  background: var(--bg-surface);
  transform: scale(1.02);
  z-index: 2;
}

.price-flag {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--volt-green);
  color: #0a0a0c;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 900;
  padding: 3px 12px;
  border: 2px solid #0a0a0c;
  border-radius: 4px;
  box-shadow: 2px 2px 0px #0a0a0c;
  white-space: nowrap;
}

.price-header {
  text-align: center;
  margin-bottom: 20px;
}

.price-plan-name {
  font-family: var(--font-display);
  font-size: 1.4rem;
  letter-spacing: -0.5px;
  color: var(--text-main);
  margin-bottom: 6px;
}

.price-plan-tagline {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.price-amount-box {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 2px;
  margin: 18px 0 10px 0;
}

.price-currency {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--volt-green);
}

.price-val {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-main);
}

.price-cycle {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-left: 4px;
}

.price-quota-badge {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 800;
  background: #0a0a0c;
  color: var(--volt-green);
  padding: 4px 10px;
  border-radius: 4px;
  display: inline-block;
  margin-top: 6px;
}

.price-features-list {
  list-style: none;
  margin: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-grow: 1;
  border-top: 1px dashed var(--border-strong);
  padding-top: 18px;
}

.price-features-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.price-features-list svg {
  width: 16px;
  height: 16px;
  color: var(--volt-green);
  flex-shrink: 0;
}

/* ---------------- 用户真实评价 (User Reviews) ---------------- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-post-it {
  background: var(--bg-surface);
  border: 2px solid var(--border-strong);
  border-radius: 8px;
  padding: 28px 24px;
  box-shadow: var(--shadow-brutal);
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease;
}

.review-post-it:hover {
  transform: translateY(-4px) rotate(-0.5deg);
}

.review-post-it:nth-child(2) {
  transform: rotate(0.8deg);
}

.review-post-it:nth-child(2):hover {
  transform: translateY(-4px) rotate(0deg);
}

.review-rating-stars {
  display: flex;
  gap: 4px;
  color: var(--volt-green);
  margin-bottom: 14px;
}

.review-rating-stars svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.review-text {
  font-size: 0.96rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-style: italic;
  flex-grow: 1;
}

.review-user-footer {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px dashed var(--border-strong);
  padding-top: 14px;
}

.review-avatar-box {
  width: 38px;
  height: 38px;
  border-radius: 6px;
  background: #0a0a0c;
  color: var(--volt-green);
  border: 1px solid var(--volt-green);
  font-family: var(--font-display);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.review-meta-name {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--text-main);
}

.review-meta-role {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ---------------- 常见问题解答 (FAQ) ---------------- */
.faq-box-wrap {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-card-item {
  background: var(--bg-surface);
  border: 2px solid var(--border-strong);
  border-radius: 8px;
  box-shadow: var(--shadow-brutal);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-card-item:hover {
  border-color: var(--volt-green);
}

.faq-trigger-btn {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  gap: 16px;
}

.faq-q-title {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.faq-q-num {
  color: var(--volt-green);
  font-size: 0.9rem;
}

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

.faq-card-item.active .faq-arrow-icon {
  transform: rotate(180deg);
  color: var(--volt-green);
}

.faq-drawer-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.96rem;
  line-height: 1.75;
}

.faq-card-item.active .faq-drawer-content {
  max-height: 500px;
  transition: max-height 0.4s ease-in-out;
  padding-bottom: 22px;
}

/* ---------------- 街头海报风底部转化横幅 (Bottom Banner) ---------------- */
.bottom-mega-banner {
  background: #0a0a0c;
  color: #ffffff;
  border: 3px solid var(--volt-green);
  border-radius: 12px;
  padding: 60px 40px;
  text-align: center;
  box-shadow: var(--shadow-brutal-volt);
  position: relative;
  overflow: hidden;
  margin-top: 40px;
}

.bottom-mega-banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
  background: var(--hazard-border);
}

.bottom-banner-title {
  font-family: var(--font-display);
  font-size: 2.8rem;
  letter-spacing: -1px;
  text-transform: uppercase;
  margin-bottom: 16px;
  color: #ffffff;
}

.bottom-banner-title .neon-green {
  color: var(--volt-green);
}

.bottom-banner-desc {
  font-size: 1.15rem;
  color: #a1a1aa;
  max-width: 660px;
  margin: 0 auto 32px auto;
  line-height: 1.7;
}

/* ---------------- 页脚规范 (Footer) ----------------
   用户严格要求：页脚只保留这四个标题，内容打开新的页面展示
   -------------------------------------------------- */
.site-footer {
  background: var(--bg-surface);
  border-top: 2px solid var(--border-strong);
  padding: 50px 0 36px 0;
  position: relative;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  text-align: center;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
}

.footer-link {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-main);
  padding: 6px 10px;
  border: 1px solid transparent;
  border-radius: 4px;
  position: relative;
  transition: all var(--transition-fast);
}

.footer-link:hover {
  background: var(--volt-green);
  color: #0a0a0c;
  border-color: #0a0a0c;
  box-shadow: 2px 2px 0px #0a0a0c;
}

.footer-sep {
  width: 100%;
  max-width: 700px;
  height: 2px;
  background: var(--hazard-border);
}

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

.footer-copyright a {
  color: var(--text-main);
  text-decoration: underline;
}

/* ---------------- 推荐资讯页与内页公共样式 (News & Legal) ---------------- */
.page-container {
  padding-top: calc(var(--nav-height) + 50px);
  padding-bottom: 90px;
  max-width: 960px;
  margin: 0 auto;
}

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

.page-title {
  font-family: var(--font-display);
  font-size: 2.8rem;
  letter-spacing: -1px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.article-box {
  background: var(--bg-surface);
  border: 2px solid var(--border-strong);
  border-radius: 12px;
  padding: 44px 38px;
  box-shadow: var(--shadow-brutal);
  line-height: 1.85;
}

.article-box h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  margin: 32px 0 16px 0;
  color: var(--text-main);
  border-bottom: 2px dashed var(--border-strong);
  padding-bottom: 8px;
}

.article-box h3 {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  margin: 20px 0 10px 0;
  color: var(--text-main);
}

.article-box p {
  margin-bottom: 16px;
  font-size: 1rem;
  color: var(--text-secondary);
}

.article-box ul, .article-box ol {
  margin-bottom: 20px;
  padding-left: 24px;
  color: var(--text-secondary);
}

.article-box li {
  margin-bottom: 8px;
}

.news-card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.news-item-card {
  background: var(--bg-pitch);
  border: 2px solid var(--border-strong);
  border-radius: 8px;
  padding: 24px;
  transition: all var(--transition-fast);
}

.news-item-card:hover {
  transform: translateY(-4px);
  border-color: var(--volt-green);
  box-shadow: var(--shadow-brutal);
}

.news-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 800;
  background: var(--volt-green);
  color: #0a0a0c;
  padding: 2px 8px;
  border-radius: 3px;
  display: inline-block;
  margin-bottom: 12px;
}

.news-item-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin-bottom: 10px;
  color: var(--text-main);
}

/* ---------------- 响应式媒体查询 (@media) ---------------- */
@media (max-width: 1080px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

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

  .showcase-dual-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 68px;
  }

  .section {
    padding: 60px 0;
  }

  .hero-headline {
    font-size: 2.3rem;
  }

  .hero-poster-frame {
    padding: 30px 20px;
  }

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

  .features-grid,
  .pricing-grid,
  .reviews-grid,
  .news-card-grid {
    grid-template-columns: 1fr; /* 移动端单栏完美显示 */
  }

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

  /* 移动端菜单抽屉 */
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 2px solid var(--border-strong);
    flex-direction: column;
    padding: 20px;
    gap: 12px;
    box-shadow: var(--shadow-brutal-lg);
  }

  .nav-links.active {
    display: flex;
  }

  .mobile-menu-btn {
    display: flex;
    width: 44px;
    height: 44px;
    border: 2px solid var(--border-strong);
    border-radius: 8px;
    background: var(--bg-surface);
    color: var(--text-main);
    align-items: center;
    justify-content: center;
    box-shadow: 2px 2px 0px var(--border-strong);
  }

  .mobile-menu-btn svg {
    width: 22px;
    height: 22px;
  }

  .header-actions .btn {
    display: none;
  }

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

  .hero-actions-group .btn {
    width: 100%;
    padding: 16px 20px;
  }

  .bottom-mega-banner {
    padding: 40px 20px;
  }

  .bottom-banner-title {
    font-size: 1.9rem;
  }

  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
}

@media (max-width: 480px) {
  .hero-headline {
    font-size: 1.95rem;
  }

  .brand-stickers-wrap {
    grid-template-columns: 1fr;
  }

  .hero-telemetry-grid {
    grid-template-columns: 1fr;
  }
}