/* ============================================================
   ikuku云 (ikuku Cloud) - 官方原生样式表
   风格：黑曜金星 + 暗夜宇宙 + 奢华神秘
   配色：#000000 (纯黑) -> #0A0808 | 主色 #D4AF37 (古典金) | 次色 #FFD700 (闪亮金)
   ============================================================ */

/* 采用零网络依赖、首屏秒开的高性能本地与系统优先字体栈 */

:root {
  /* 奢华黑曜与古典金调色板 */
  --bg-main: #000000;
  --bg-deep: #0A0808;
  --bg-card: rgba(14, 11, 11, 0.82);
  --bg-card-hover: rgba(24, 18, 16, 0.92);
  --bg-subtle: #0f0c0c;
  
  --border-color: rgba(212, 175, 55, 0.18);
  --border-focus: rgba(255, 215, 0, 0.48);
  --border-glow: rgba(212, 175, 55, 0.6);

  /* 金色系规范 */
  --primary: #D4AF37;           /* 古典金 */
  --secondary: #FFD700;         /* 闪亮金 */
  --gold-dark: #997A15;
  --gold-light: #FFE066;
  
  --gold-gradient: linear-gradient(135deg, #D4AF37 0%, #FFD700 50%, #D4AF37 100%);
  --gold-btn-gradient: linear-gradient(135deg, #D4AF37 0%, #FFD700 100%);
  --gold-btn-hover: linear-gradient(135deg, #FFD700 0%, #FFF099 100%);
  --gold-subtle-gradient: linear-gradient(135deg, rgba(212, 175, 55, 0.15) 0%, rgba(255, 215, 0, 0.05) 100%);

  /* 文字颜色 */
  --text-white: #FFFFFF;
  --text-gold: #D4AF37;
  --text-bright-gold: #FFD700;
  --text-primary: #EDE8D0;
  --text-secondary: #B8AF98;
  --text-muted: #7A7260;

  /* 辉光阴影与模糊 */
  --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.6);
  --shadow-gold-30: 0 0 30px rgba(212, 175, 55, 0.45);
  --shadow-gold-bright: 0 0 40px rgba(255, 215, 0, 0.75);
  --backdrop-blur: blur(20px);
  
  /* 圆角规范 */
  --radius-cta: 4px;            /* CTA 按钮圆角 4px 规范 */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  /* 字体规范：系统原生优先，兼顾极致中西文排版与首屏极速加载 */
  --font-serif: "Playfair Display", Didot, "Georgia", "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Inter, sans-serif;
  
  --max-width: 1200px;
  --transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* 锚点防固定页眉遮挡规范 */
[id] {
  scroll-margin-top: 80px;
}

/* 键盘无障碍跳跃链接 (Skip to main content) */
.skip-link {
  position: absolute;
  top: -9999px;
  left: 20px;
  background: var(--gold-btn-gradient);
  color: #000000;
  padding: 10px 18px;
  border-radius: var(--radius-cta);
  font-weight: 700;
  font-size: 14px;
  z-index: 100000;
  text-decoration: none;
  box-shadow: var(--shadow-gold-30);
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 15px;
  outline: 2px solid var(--secondary);
}

/* 屏幕阅读器与无障碍语义辅助类 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* 晕动症减弱动效规范 */
@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;
  }
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-primary);
  scroll-behavior: smooth;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  background: radial-gradient(circle at 50% 0%, #15100a 0%, #080606 45%, #000000 85%);
}

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

ul, ol {
  list-style: none;
}

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

/* ============================================================
   【背景动效】全屏 100 颗星点随机闪烁 + 10 秒周期横向金色扫光细线
   ============================================================ */

.cosmic-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

/* 横向金色细线（10秒一周期，从顶部缓慢扫到底部） */
.cosmic-scanline {
  position: absolute;
  left: 0;
  right: 0;
  height: 1.5px;
  background: linear-gradient(90deg, 
    transparent 0%, 
    rgba(212, 175, 55, 0.15) 15%, 
    #D4AF37 35%, 
    #FFD700 50%, 
    #D4AF37 65%, 
    rgba(212, 175, 55, 0.15) 85%, 
    transparent 100%);
  box-shadow: 
    0 0 12px rgba(255, 215, 0, 0.8),
    0 0 28px rgba(212, 175, 55, 0.45);
  animation: cosmicSweep 10s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes cosmicSweep {
  0% {
    top: -20px;
    opacity: 0;
  }
  8% {
    opacity: 1;
  }
  92% {
    opacity: 1;
  }
  100% {
    top: 105%;
    opacity: 0;
  }
}

/* 100 颗星点基础样式 */
.star {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  animation: starTwinkle ease-in-out infinite alternate;
}

/* 80% 普通白色星点 */
.star-white {
  background: #FFFFFF;
  box-shadow: 0 0 3px rgba(255, 255, 255, 0.8);
}

/* 20% 金色星点（带双层辉光阴影） */
.star-gold {
  background: #FFD700;
  box-shadow: 
    0 0 5px #FFD700, 
    0 0 12px #D4AF37;
  animation-name: goldStarTwinkle;
}

@keyframes starTwinkle {
  0% {
    opacity: 0.15;
    transform: scale(0.7);
  }
  100% {
    opacity: 0.95;
    transform: scale(1.15);
  }
}

@keyframes goldStarTwinkle {
  0% {
    opacity: 0.25;
    transform: scale(0.8);
    box-shadow: 0 0 3px #FFD700, 0 0 8px #D4AF37;
  }
  100% {
    opacity: 1;
    transform: scale(1.35);
    box-shadow: 0 0 8px #FFD700, 0 0 20px #D4AF37;
  }
}

/* ============================================================
   布局容器与排版
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

.section {
  padding: 96px 0;
  position: relative;
}

.section-title-wrap {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--secondary);
  background: rgba(212, 175, 55, 0.08);
  border: 1px solid rgba(212, 175, 55, 0.35);
  border-radius: var(--radius-full);
  margin-bottom: 18px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  box-shadow: 0 0 16px rgba(212, 175, 55, 0.15);
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2.35rem;
  font-weight: 700;
  color: var(--text-white);
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section-title span {
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 15px rgba(212, 175, 55, 0.35));
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 顶部导航 */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 6, 6, 0.88);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  font-style: italic;
  color: var(--text-white);
  letter-spacing: -0.01em;
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: var(--gold-btn-gradient);
  border-radius: var(--radius-cta);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px rgba(212, 175, 55, 0.55);
}

.logo-text {
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 12px rgba(212, 175, 55, 0.4));
}

.logo-text span {
  font-family: var(--font-sans);
  font-style: normal;
  font-weight: 700;
  color: var(--secondary);
  -webkit-text-fill-color: var(--secondary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
}

.nav-link:hover {
  color: var(--secondary);
  text-shadow: 0 0 10px rgba(255, 215, 0, 0.4);
}

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

/* ============================================================
   【CTA 按钮】金到亮金渐变，圆角 4px，30px 金色辉光，hover 变亮金
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  border-radius: var(--radius-cta) !important; /* 严格规范 4px 圆角 */
  padding: 12px 26px;
  font-size: 0.95rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gold-btn-gradient);
  color: #050402 !important;
  box-shadow: var(--shadow-gold-30);
  border: 1px solid rgba(255, 215, 0, 0.6);
  letter-spacing: 0.02em;
}

.btn-primary:hover {
  transform: translateY(-2px);
  background: var(--gold-btn-hover);
  box-shadow: var(--shadow-gold-bright), 0 0 60px rgba(212, 175, 55, 0.4);
  color: #000000 !important;
}

.btn-secondary {
  background: rgba(212, 175, 55, 0.06);
  border-color: rgba(212, 175, 55, 0.35);
  color: var(--secondary);
  box-shadow: 0 0 15px rgba(212, 175, 55, 0.15);
}

.btn-secondary:hover {
  background: rgba(212, 175, 55, 0.15);
  border-color: var(--secondary);
  box-shadow: 0 0 25px rgba(255, 215, 0, 0.45);
  color: var(--text-white);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.08rem;
  min-height: 52px;
}

.btn-block {
  width: 100%;
}

/* ============================================================
   【大标题布局与黑曜石宝石双环动效】
   左侧：Playfair Display 700 斜体 + 金到亮金到金三段渐变 + 双层金色文字阴影
   右侧：2层虚线圆环反向旋转 + 200×240px 黑曜石宝石 SVG (5个切面) + 4星点
   ============================================================ */

.hero-section {
  padding: 85px 0 70px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  align-items: center;
  gap: 40px;
  margin-bottom: 56px;
}

.hero-left {
  text-align: left;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  background: rgba(212, 175, 55, 0.08);
  border: 1px solid rgba(212, 175, 55, 0.35);
  border-radius: var(--radius-full);
  color: var(--secondary);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 24px;
  box-shadow: 0 0 20px rgba(212, 175, 55, 0.15);
}

.hero-badge .pulse-dot {
  width: 7px;
  height: 7px;
  background-color: var(--secondary);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--secondary);
}

/* 大标题：H1「ikuku云」使用 Playfair Display 衬线字体 + 斜体，金色到亮金到金三段渐变 + 双层金色文字阴影 */
.hero-headline {
  font-family: var(--font-serif);
  font-weight: 700;
  font-style: italic;
  font-size: 3.8rem;
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin-bottom: 18px;
  
  background: linear-gradient(135deg, #D4AF37 0%, #FFD700 50%, #D4AF37 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  
  /* 双层金色文字阴影 (滤镜形式保证跨引擎完美渲染) */
  filter: drop-shadow(0 0 20px rgba(212, 175, 55, 0.55)) 
          drop-shadow(0 0 45px rgba(255, 215, 0, 0.32));
}

.hero-headline-sub {
  display: block;
  font-family: var(--font-sans);
  font-style: normal;
  font-weight: 700;
  font-size: 1.85rem;
  color: var(--text-white);
  margin-top: 8px;
  letter-spacing: 0.02em;
  filter: none;
}

.hero-subheadline {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

/* 主视觉区平台深度简介框 */
.hero-synopsis {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-cta);
  padding: 20px 24px;
  margin-bottom: 32px;
  text-align: left;
  backdrop-filter: var(--backdrop-blur);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.6), inset 0 0 20px rgba(212, 175, 55, 0.04);
  position: relative;
  border-left: 3px solid var(--secondary);
}

.hero-synopsis-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--secondary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero-synopsis-text {
  font-size: 0.94rem;
  color: var(--text-primary);
  line-height: 1.75;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

/* ============================================================
   右侧动画展示：2层虚线圆环 + 200×240px 黑曜石宝石 SVG + 4星点
   ============================================================ */

.hero-right-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  width: 100%;
  min-height: 380px;
}

.gem-stage {
  position: relative;
  width: 340px;
  height: 340px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 外层虚线圆环（金，逆时针旋转，慢速 24s） */
.ring-outer {
  position: absolute;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  border: 1.5px dashed rgba(212, 175, 55, 0.65);
  box-shadow: 0 0 20px rgba(212, 175, 55, 0.2);
  animation: spinCounterClockwise 24s linear infinite;
  pointer-events: none;
}

/* 内层虚线圆环（亮金，实线+虚线组合，顺时针旋转，中速 16s） */
.ring-inner {
  position: absolute;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  border: 2px dashed rgba(255, 215, 0, 0.85);
  border-top-style: solid;
  border-bottom-style: solid;
  box-shadow: 0 0 25px rgba(255, 215, 0, 0.35);
  animation: spinClockwise 16s linear infinite;
  pointer-events: none;
}

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

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

/* 200×240px 黑曜石宝石容器（上下浮动 + 轻微旋转，4秒一周期，双层 drop-shadow 辉光） */
.obsidian-gem-wrap {
  width: 200px;
  height: 240px;
  position: relative;
  z-index: 5;
  filter: drop-shadow(0 0 15px rgba(212, 175, 55, 0.65))
          drop-shadow(0 0 32px rgba(255, 215, 0, 0.42));
  animation: gemFloat 4s ease-in-out infinite;
}

@keyframes gemFloat {
  0%, 100% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-12px) rotate(2.5deg);
  }
}

/* 镜面高光闪烁动画 */
.specular-shine {
  animation: shinePulse 3s ease-in-out infinite alternate;
}

@keyframes shinePulse {
  0% { opacity: 0.3; }
  50% { opacity: 0.95; }
  100% { opacity: 0.4; }
}

/* 宝石周围 4 个金色 sparkle 星点随机位置闪烁（1.8秒一周期） */
.gem-sparkle {
  position: absolute;
  width: 16px;
  height: 16px;
  z-index: 6;
  pointer-events: none;
  animation: sparkleTwinkle 1.8s ease-in-out infinite alternate;
}

.sparkle-1 { top: 25px; left: 40px; animation-delay: 0s; }
.sparkle-2 { top: 45px; right: 35px; animation-delay: 0.45s; }
.sparkle-3 { bottom: 50px; left: 30px; animation-delay: 0.9s; }
.sparkle-4 { bottom: 30px; right: 45px; animation-delay: 1.35s; }

@keyframes sparkleTwinkle {
  0% {
    opacity: 0.1;
    transform: scale(0.6) rotate(0deg);
  }
  50% {
    opacity: 1;
    transform: scale(1.3) rotate(45deg);
    filter: drop-shadow(0 0 8px #FFD700);
  }
  100% {
    opacity: 0.2;
    transform: scale(0.7) rotate(90deg);
  }
}

/* 信任指标栏 */
.hero-trust-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.trust-item svg {
  color: var(--secondary);
  flex-shrink: 0;
}

/* ============================================================
   核心优势卡片 (3 Cards)
   ============================================================ */

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-cta);
  padding: 36px 30px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  backdrop-filter: var(--backdrop-blur);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7), 0 0 25px rgba(212, 175, 55, 0.25);
}

.feature-icon-wrap {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-cta);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: #050402;
  background: var(--gold-btn-gradient);
  box-shadow: 0 0 20px rgba(212, 175, 55, 0.45);
}

.feature-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 14px;
}

.feature-desc {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feature-pill {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: rgba(212, 175, 55, 0.08);
  border: 1px solid rgba(212, 175, 55, 0.25);
  color: var(--secondary);
}

/* ============================================================
   流媒体与 AI 支持图卡
   ============================================================ */

.media-ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.media-ai-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-cta);
  padding: 40px;
  position: relative;
  overflow: hidden;
  backdrop-filter: var(--backdrop-blur);
  transition: var(--transition);
}

.media-ai-card:hover {
  border-color: var(--secondary);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.6), 0 0 25px rgba(255, 215, 0, 0.2);
}

.card-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 18px;
  background: rgba(212, 175, 55, 0.12);
  color: var(--secondary);
  border: 1px solid rgba(212, 175, 55, 0.35);
}

.media-ai-title {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 14px;
}

.media-ai-desc {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 28px;
}

.app-tags-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.app-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(212, 175, 55, 0.15);
  border-radius: var(--radius-cta);
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: var(--transition);
}

.app-item:hover {
  background: rgba(212, 175, 55, 0.08);
  border-color: rgba(255, 215, 0, 0.4);
}

.app-item-icon {
  width: 28px;
  height: 28px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: bold;
}

.app-item-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-white);
}

.app-item-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.media-specs {
  display: flex;
  gap: 20px;
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
}

.spec-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.86rem;
  color: var(--secondary);
  font-weight: 600;
}

/* ============================================================
   套餐价格对比表
   ============================================================ */

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-cta);
  padding: 32px 24px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  backdrop-filter: var(--backdrop-blur);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-focus);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7), 0 0 20px rgba(212, 175, 55, 0.25);
}

.pricing-card.featured {
  border-color: var(--secondary);
  background: rgba(22, 16, 14, 0.9);
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.8), 0 0 35px rgba(212, 175, 55, 0.35);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.9), var(--shadow-gold-bright);
}

.popular-ribbon {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gold-btn-gradient);
  color: #050402;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-cta);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  box-shadow: 0 0 16px rgba(255, 215, 0, 0.6);
}

.plan-name {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 40px;
  margin-bottom: 16px;
}

.plan-price-wrap {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.plan-price-currency {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--secondary);
  vertical-align: top;
}

.plan-price-num {
  font-size: 2.75rem;
  font-weight: 900;
  color: var(--text-white);
  line-height: 1;
}

.plan-price-unit {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.plan-features {
  flex-grow: 1;
  margin-bottom: 28px;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.plan-feature-item svg {
  color: var(--secondary);
  flex-shrink: 0;
}

.plan-feature-item.highlight {
  color: var(--text-white);
  font-weight: 600;
}

/* 参数对比速查表 */
.pricing-table-container {
  overflow-x: auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-cta);
  padding: 24px;
  margin-top: 30px;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.comparison-table th, 
.comparison-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.92rem;
}

.comparison-table th {
  font-family: var(--font-serif);
  color: var(--text-white);
  font-weight: 700;
  background: rgba(212, 175, 55, 0.04);
}

.comparison-table td {
  color: var(--text-secondary);
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

.comparison-table tr:hover td {
  background: rgba(212, 175, 55, 0.05);
}

.badge-yes {
  color: var(--secondary);
  font-weight: 700;
}

/* ============================================================
   用户口碑评价
   ============================================================ */

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

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-cta);
  padding: 32px 26px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6), 0 0 20px rgba(212, 175, 55, 0.15);
}

.testimonial-stars {
  color: var(--secondary);
  margin-bottom: 16px;
  display: flex;
  gap: 4px;
  letter-spacing: 2px;
}

.testimonial-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.68;
  margin-bottom: 24px;
  flex-grow: 1;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-cta);
  background: var(--gold-btn-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #050402;
  font-size: 0.95rem;
  box-shadow: 0 0 12px rgba(212, 175, 55, 0.4);
}

.author-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-white);
}

.author-title {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ============================================================
   常见问题解答 (FAQ) - 原生纯 CSS Accordion
   ============================================================ */

.faq-grid {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item:hover {
  border-color: rgba(255, 215, 0, 0.35);
}

.faq-question {
  padding: 22px 26px;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-white);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-icon {
  transition: transform 0.25s ease;
  color: var(--secondary);
  flex-shrink: 0;
}

details[open] .faq-icon {
  transform: rotate(180deg);
}

details[open] .faq-item {
  border-color: var(--border-focus);
  box-shadow: 0 0 25px rgba(212, 175, 55, 0.15);
}

.faq-answer {
  padding: 0 26px 22px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  border-top: 1px solid rgba(212, 175, 55, 0.1);
  padding-top: 16px;
}

/* ============================================================
   底部 CTA 诱导区
   ============================================================ */

.cta-banner-section {
  padding: 70px 0;
}

.cta-banner {
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.12) 0%, rgba(255, 215, 0, 0.05) 100%);
  border: 1px solid rgba(255, 215, 0, 0.4);
  border-radius: var(--radius-cta);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 30px rgba(212, 175, 55, 0.2);
}

.cta-banner-title {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 16px;
}

.cta-banner-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 32px;
}

/* ============================================================
   页脚 (只保留四个指定标题，新窗口打开)
   ============================================================ */

.footer {
  background: #040303;
  border-top: 1px solid var(--border-color);
  padding: 50px 0 35px;
  margin-top: auto;
  position: relative;
  z-index: 2;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.footer-nav-link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition);
  padding: 6px 14px;
  border-radius: var(--radius-cta);
}

.footer-nav-link:hover {
  color: var(--secondary);
  background: rgba(212, 175, 55, 0.08);
  box-shadow: 0 0 15px rgba(255, 215, 0, 0.25);
}

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid rgba(212, 175, 55, 0.1);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-bottom p {
  margin-bottom: 6px;
}

/* ============================================================
   子页面专属样式 (关于/条款/隐私/地图/科普)
   ============================================================ */

.page-header {
  padding: 70px 0 40px;
  text-align: center;
  background: rgba(14, 11, 11, 0.6);
  border-bottom: 1px solid var(--border-color);
}

.page-title {
  font-family: var(--font-serif);
  font-size: 2.6rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 12px;
}

.page-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

.legal-content-wrap {
  max-width: 880px;
  margin: 50px auto 80px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-cta);
  padding: 48px;
  backdrop-filter: var(--backdrop-blur);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.6);
}

.legal-section {
  margin-bottom: 40px;
}

.legal-section:last-child {
  margin-bottom: 0;
}

.legal-h2 {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(212, 175, 55, 0.12);
  display: flex;
  align-items: center;
  gap: 10px;
}

.legal-h2 svg {
  color: var(--secondary);
}

.legal-p {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 14px;
}

.legal-list {
  list-style: disc;
  margin-left: 24px;
  margin-bottom: 16px;
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.8;
}

.legal-list li {
  margin-bottom: 8px;
}

.alert-box {
  background: rgba(212, 175, 55, 0.08);
  border-left: 4px solid var(--secondary);
  padding: 16px 20px;
  border-radius: 0 var(--radius-cta) var(--radius-cta) 0;
  margin: 20px 0;
  color: var(--text-primary);
  font-size: 0.95rem;
  line-height: 1.65;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-top: 24px;
}

.sitemap-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-cta);
  padding: 24px;
}

.sitemap-card-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sitemap-links li {
  margin-bottom: 10px;
}

.sitemap-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sitemap-links a:hover {
  color: var(--secondary);
  transform: translateX(4px);
}

/* ============================================================
   SEO 知识科普专区与 9 篇深度长文专有样式
   ============================================================ */

.article-toc-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-cta);
  padding: 32px 28px;
  margin-bottom: 48px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7);
  border-left: 4px solid var(--secondary);
}

.article-toc-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-toc-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.article-toc-item {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(212, 175, 55, 0.15);
  border-radius: var(--radius-cta);
  padding: 14px 16px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.article-toc-item:hover {
  background: rgba(212, 175, 55, 0.08);
  border-color: var(--secondary);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(212, 175, 55, 0.15);
}

.article-toc-num {
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--secondary);
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.article-toc-text {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.5;
}

/* 独立 SEO 文章卡片 */
.seo-article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-cta);
  padding: 42px 36px;
  margin-bottom: 40px;
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.65);
  position: relative;
  transition: var(--transition);
}

.seo-article-card:hover {
  border-color: rgba(255, 215, 0, 0.35);
}

.seo-meta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(212, 175, 55, 0.12);
  flex-wrap: wrap;
  gap: 10px;
}

.seo-tag-badge {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--secondary);
  background: rgba(212, 175, 55, 0.1);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(212, 175, 55, 0.3);
}

.seo-word-count {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.seo-article-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-white);
  line-height: 1.35;
  margin-bottom: 20px;
}

.seo-article-body {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.85;
}

.seo-article-body p {
  margin-bottom: 16px;
}

.seo-article-body h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--secondary);
  margin: 24px 0 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.seo-article-body strong {
  color: var(--text-white);
  font-weight: 700;
}

/* 文章内专属 FAQ 容器 */
.article-faq-wrap {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px dashed rgba(212, 175, 55, 0.25);
}

.article-faq-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-faq-wrap .faq-item {
  margin-bottom: 10px;
  border-radius: var(--radius-cta);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(212, 175, 55, 0.15);
}

.article-faq-wrap .faq-question {
  padding: 14px 18px;
  font-size: 0.96rem;
}

.article-faq-wrap .faq-answer {
  padding: 0 18px 14px;
  font-size: 0.92rem;
  line-height: 1.65;
}

/* 内链高亮强调样式 */
.internal-link {
  color: var(--secondary) !important;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: var(--transition);
}

.internal-link:hover {
  color: #FFFFFF !important;
  text-shadow: 0 0 10px rgba(255, 215, 0, 0.8);
}

@media (max-width: 1024px) {
  .article-toc-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .article-toc-grid {
    grid-template-columns: 1fr;
  }
  .seo-article-card {
    padding: 28px 20px;
  }
  .seo-article-title {
    font-size: 1.35rem;
  }
}

/* ============================================================
   响应式媒体查询 (@media)
   ============================================================ */

@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 32px;
  }
  
  .hero-left {
    text-align: center;
  }
  
  .hero-synopsis {
    text-align: left;
  }

  .hero-cta-group {
    justify-content: center;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  
  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }

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

@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }
  
  .hero-section {
    padding: 60px 0 50px;
  }
  
  .hero-headline {
    font-size: 2.6rem;
  }
  
  .hero-headline-sub {
    font-size: 1.4rem;
  }
  
  .hero-subheadline {
    font-size: 1.05rem;
    margin-bottom: 24px;
  }
  
  .hero-cta-group {
    flex-direction: column;
    gap: 14px;
    width: 100%;
  }

  .btn-lg {
    width: 100%;
    min-height: 50px;
    font-size: 1.05rem;
  }
  
  .hero-trust-bar {
    gap: 16px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  
  .media-ai-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .media-ai-card {
    padding: 26px 20px;
  }

  .app-tags-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .testimonials-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 18px;
  }
  
  .nav-links {
    display: none;
  }
  
  .legal-content-wrap {
    padding: 24px 18px;
    margin: 30px auto 50px;
  }
  
  .sitemap-grid {
    grid-template-columns: 1fr;
  }
  
  .cta-banner {
    padding: 40px 20px;
  }
  
  .cta-banner-title {
    font-size: 1.8rem;
  }

  .gem-stage {
    width: 280px;
    height: 280px;
  }

  .ring-outer {
    width: 270px;
    height: 270px;
  }

  .ring-inner {
    width: 220px;
    height: 220px;
  }
}

@media (max-width: 480px) {
  .hero-headline {
    font-size: 2.2rem;
  }

  .hero-headline-sub {
    font-size: 1.2rem;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .container {
    padding: 0 16px;
  }

  .btn {
    min-height: 48px;
    padding: 12px 20px;
  }

  .faq-question {
    padding: 18px 20px;
    font-size: 0.98rem;
  }
  
  .faq-answer {
    padding: 0 20px 18px;
    font-size: 0.9rem;
  }
}