/* ==========================================================================
   云海互联官网 (oceancloud.mom) - 原生现代化极致性能样式表
   零重型外部依赖 · 秒开级加载 · 响应式动态交互
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", Consolas, "Courier New", monospace;

  /* 品牌色彩系统 - 深邃云海与霓虹极光 */
  --bg-dark: #030816;
  --bg-deep: #061124;
  --bg-card: rgba(10, 24, 48, 0.72);
  --bg-card-hover: rgba(14, 34, 68, 0.88);
  --border-subtle: rgba(56, 189, 248, 0.16);
  --border-focus: rgba(0, 242, 254, 0.45);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --accent-cyan: #00f2fe;
  --accent-sky: #38bdf8;
  --accent-blue: #2563eb;
  --accent-indigo: #6366f1;
  --accent-purple: #a855f7;
  --accent-emerald: #10b981;
  --accent-rose: #f43f5e;
  --accent-amber: #f59e0b;

  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5), 0 0 20px -5px rgba(56, 189, 248, 0.12);
  --shadow-glow: 0 0 35px -5px rgba(0, 242, 254, 0.35);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --container-max: 1240px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 动态背景画布 */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
}

/* ==========================================================================
   动态苍穹背景系统：太阳、漂浮云朵与展翅飞鸟
   纯原生硬件加速 · 零重型库 · 极致60FPS
   ========================================================================== */
.dynamic-sky {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  user-select: none;
}

/* --- 1. 恒辉太阳与多重日光冕晕 --- */
.sky-sun-wrap {
  position: absolute;
  top: 35px;
  right: 12%;
  width: 160px;
  height: 160px;
  pointer-events: none;
}

/* 太阳核心亮球 */
.sun-core {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 78px;
  height: 78px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle, #ffffff 12%, #fef08a 38%, #f59e0b 72%, #ea580c 100%);
  box-shadow: 0 0 40px #fde047, 0 0 80px rgba(245, 158, 11, 0.65), 0 0 130px rgba(234, 88, 12, 0.4);
  animation: sunBreathing 7s infinite ease-in-out alternate;
}

/* 太阳旋转漫反射光芒 */
.sun-rays {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 200px;
  height: 200px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: repeating-conic-gradient(from 0deg, rgba(254, 240, 138, 0.22) 0deg 10deg, transparent 10deg 24deg);
  filter: blur(6px);
  animation: sunRaysSpin 48s infinite linear;
}

/* 中层与外层光晕 */
.sun-corona {
  position: absolute;
  top: 50%;
  left: 50%;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.sun-corona-mid {
  width: 140px;
  height: 140px;
  background: radial-gradient(circle, rgba(254, 240, 138, 0.35) 0%, rgba(245, 158, 11, 0.15) 60%, transparent 75%);
  filter: blur(16px);
  animation: coronaPulse 8s infinite ease-in-out alternate;
}

.sun-corona-outer {
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(251, 191, 36, 0.22) 0%, rgba(56, 189, 248, 0.18) 50%, transparent 70%);
  filter: blur(32px);
  animation: coronaPulse 12s infinite ease-in-out alternate-reverse;
}

@keyframes sunBreathing {
  0% {
    transform: translate(-50%, -50%) scale(0.95);
    box-shadow: 0 0 35px #fde047, 0 0 70px rgba(245, 158, 11, 0.55), 0 0 110px rgba(234, 88, 12, 0.35);
  }
  100% {
    transform: translate(-50%, -50%) scale(1.06);
    box-shadow: 0 0 50px #fffbeb, 0 0 95px rgba(245, 158, 11, 0.8), 0 0 150px rgba(56, 189, 248, 0.45);
  }
}

@keyframes sunRaysSpin {
  0% { transform: translate(-50%, -50%) rotate(0deg); }
  100% { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes coronaPulse {
  0% { transform: translate(-50%, -50%) scale(0.92); opacity: 0.7; }
  100% { transform: translate(-50%, -50%) scale(1.12); opacity: 1; }
}

/* --- 2. 漫步云海多层立体浮云 --- */
.sky-clouds-wrap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.cloud-item {
  position: absolute;
  pointer-events: none;
  opacity: 0.32;
  filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.35));
  will-change: transform;
}

.cloud-svg {
  display: block;
  width: 100%;
  height: auto;
}

/* 云朵 1: 高空大朵云 */
.cloud-1 {
  top: 50px;
  width: 380px;
  animation: cloudDriftSlow 75s infinite linear;
  animation-delay: -22s;
  opacity: 0.28;
}

/* 云朵 2: 掠过太阳的金霞云 */
.cloud-2 {
  top: 110px;
  width: 320px;
  animation: cloudDriftSlow 95s infinite linear;
  animation-delay: -55s;
  opacity: 0.35;
}

/* 云朵 3: 中空飘逸卷云 */
.cloud-3 {
  top: 190px;
  width: 440px;
  animation: cloudDriftSlow 62s infinite linear;
  animation-delay: -8s;
  opacity: 0.25;
}

/* 云朵 4: 低空柔和雾云 */
.cloud-4 {
  top: 290px;
  width: 300px;
  animation: cloudDriftSlow 115s infinite linear;
  animation-delay: -75s;
  opacity: 0.22;
}

/* 云朵 5: 右上方晨曦云 */
.cloud-5 {
  top: 30px;
  width: 260px;
  animation: cloudDriftSlow 82s infinite linear;
  animation-delay: -40s;
  opacity: 0.3;
}

@keyframes cloudDriftSlow {
  0% {
    transform: translate3d(-460px, 0, 0);
  }
  100% {
    transform: translate3d(calc(100vw + 460px), 0, 0);
  }
}

/* --- 3. 展翅翱翔飞鸟群 (动态扇动双翼) --- */
.sky-birds-wrap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.bird-unit {
  position: absolute;
  pointer-events: none;
  will-change: transform;
  filter: drop-shadow(0 2px 8px rgba(0, 242, 254, 0.45));
}

.bird-svg {
  display: block;
}

/* 翅膀扇动核心动画 (以双翼连接处 32px 18px 为中心点旋转) */
.bird-wing-left {
  transform-origin: 32px 18px;
  animation: flapWingLeft 0.55s ease-in-out infinite alternate;
}

.bird-wing-right {
  transform-origin: 32px 18px;
  animation: flapWingRight 0.55s ease-in-out infinite alternate;
}

@keyframes flapWingLeft {
  0% { transform: rotate(-35deg); }
  100% { transform: rotate(38deg); }
}

@keyframes flapWingRight {
  0% { transform: rotate(35deg); }
  100% { transform: rotate(-38deg); }
}

/* 飞鸟飞行轨迹 1 (领航鸟，大号) */
.bird-1 {
  top: 80px;
  width: 44px;
  height: 25px;
  animation: birdFlight1 22s infinite cubic-bezier(0.4, 0, 0.6, 1);
  animation-delay: -5s;
}

/* 飞鸟 2 (副翼鸟，中号) */
.bird-2 {
  top: 115px;
  width: 36px;
  height: 20px;
  animation: birdFlight2 25s infinite cubic-bezier(0.4, 0, 0.6, 1);
  animation-delay: -11s;
}

/* 飞鸟 3 (伴飞小鸟) */
.bird-3 {
  top: 65px;
  width: 28px;
  height: 16px;
  animation: birdFlight3 27s infinite cubic-bezier(0.4, 0, 0.6, 1);
  animation-delay: -18s;
}

/* 飞鸟 4 (远空微型鸟) */
.bird-4 {
  top: 155px;
  width: 22px;
  height: 13px;
  animation: birdFlight1 31s infinite cubic-bezier(0.4, 0, 0.6, 1);
  animation-delay: -14s;
  opacity: 0.75;
}

/* 飞鸟 5 (高空掠行鸟) */
.bird-5 {
  top: 40px;
  width: 32px;
  height: 18px;
  animation: birdFlight2 29s infinite cubic-bezier(0.4, 0, 0.6, 1);
  animation-delay: -2s;
}

/* 飞鸟横跨苍穹的自然起伏曲线 */
@keyframes birdFlight1 {
  0% {
    transform: translate3d(-100px, 0, 0) scale(0.9);
  }
  20% {
    transform: translate3d(22vw, -25px, 0) scale(0.95);
  }
  45% {
    transform: translate3d(48vw, 20px, 0) scale(1);
  }
  70% {
    transform: translate3d(74vw, -18px, 0) scale(0.92);
  }
  100% {
    transform: translate3d(calc(100vw + 120px), 10px, 0) scale(0.85);
  }
}

@keyframes birdFlight2 {
  0% {
    transform: translate3d(-120px, 15px, 0) scale(0.85);
  }
  25% {
    transform: translate3d(26vw, 35px, 0) scale(0.88);
  }
  55% {
    transform: translate3d(56vw, -20px, 0) scale(0.92);
  }
  80% {
    transform: translate3d(82vw, 15px, 0) scale(0.86);
  }
  100% {
    transform: translate3d(calc(100vw + 120px), -10px, 0) scale(0.8);
  }
}

@keyframes birdFlight3 {
  0% {
    transform: translate3d(-90px, -10px, 0) scale(0.75);
  }
  30% {
    transform: translate3d(32vw, 25px, 0) scale(0.8);
  }
  60% {
    transform: translate3d(62vw, -15px, 0) scale(0.78);
  }
  100% {
    transform: translate3d(calc(100vw + 120px), 30px, 0) scale(0.72);
  }
}

/* 动态流光环境光晕 */
.ambient-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.28;
  animation: orbFloat 22s infinite alternate ease-in-out;
}

.glow-orb-1 {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.7), transparent 70%);
  top: -100px;
  left: -100px;
}

.glow-orb-2 {
  width: 650px;
  height: 650px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.55), transparent 70%);
  top: 35%;
  right: -150px;
  animation-duration: 28s;
  animation-delay: -7s;
}

.glow-orb-3 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.45), transparent 70%);
  bottom: 5%;
  left: 20%;
  animation-duration: 24s;
  animation-delay: -12s;
}

@keyframes orbFloat {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(60px, 80px) scale(1.12); }
  100% { transform: translate(-40px, 120px) scale(0.92); }
}

/* 全局容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 1;
}

/* 顶部导航栏 (左上方带有品牌专属Logo) */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: rgba(3, 8, 22, 0.82);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-img {
  height: 44px;
  width: auto;
  max-width: 210px;
  object-fit: contain;
  filter: drop-shadow(0 0 12px rgba(56, 189, 248, 0.3));
  transition: var(--transition);
}

.logo-link:hover .logo-img {
  transform: translateY(-1px) scale(1.02);
  filter: drop-shadow(0 0 16px rgba(0, 242, 254, 0.5));
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 6px 4px;
  position: relative;
  transition: var(--transition);
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
  transition: var(--transition);
}

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

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

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  line-height: 1.3;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.88rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

.btn-primary {
  background: linear-gradient(135deg, #00f2fe 0%, #0284c7 60%, #4338ca 100%);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(2, 132, 199, 0.38);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 242, 254, 0.5);
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 50%, #4f46e5 100%);
}

.btn-secondary {
  background: rgba(14, 34, 68, 0.7);
  border-color: rgba(56, 189, 248, 0.35);
  color: var(--text-main);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(20, 50, 95, 0.9);
  border-color: var(--accent-cyan);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-pulse {
  position: relative;
  overflow: hidden;
}

.btn-pulse::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.25) 10%, transparent 60%);
  transform: scale(0);
  animation: ripple 3s infinite ease-out;
}

@keyframes ripple {
  0% { transform: scale(0); opacity: 1; }
  100% { transform: scale(1); opacity: 0; }
}

.btn-block {
  width: 100%;
}

/* 移动端菜单开关 */
.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-main);
  cursor: pointer;
  padding: 6px;
}

.menu-toggle svg {
  width: 28px;
  height: 28px;
}

/* ==========================================================================
   Hero 主屏英雄区
   ========================================================================== */
.hero-section {
  padding: 72px 0 60px;
  text-align: center;
  position: relative;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(14, 34, 68, 0.85);
  border: 1px solid rgba(56, 189, 248, 0.4);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  color: var(--accent-sky);
  margin-bottom: 24px;
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.15);
}

.hero-pill-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulseDot 2s infinite ease-in-out;
}

@keyframes pulseDot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.7; }
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-title .text-gradient {
  background: linear-gradient(135deg, #ffffff 15%, #38bdf8 55%, #00f2fe 80%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 860px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-subtitle strong {
  color: #ffffff;
  font-weight: 600;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1040px;
  margin: 0 auto;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.stat-num {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 800;
  color: var(--accent-cyan);
}

.stat-label {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ==========================================================================
   价格方案区 (所有价格严格同排展示)
   ========================================================================== */
.pricing-section {
  padding: 80px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent-cyan);
  margin-bottom: 12px;
  padding: 4px 14px;
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.25);
  border-radius: var(--radius-full);
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* 核心：4个价格卡片同排对齐 */
.pricing-row-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 24px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: var(--transition);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card);
}

.price-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
  box-shadow: 0 16px 36px -10px rgba(0, 0, 0, 0.6), 0 0 28px -5px rgba(0, 242, 254, 0.28);
}

.price-card.featured {
  border-color: rgba(0, 242, 254, 0.65);
  background: linear-gradient(180deg, rgba(14, 38, 77, 0.9) 0%, rgba(10, 25, 52, 0.95) 100%);
  box-shadow: 0 16px 40px -10px rgba(0, 0, 0, 0.65), 0 0 35px rgba(0, 242, 254, 0.35);
  transform: scale(1.025);
  z-index: 2;
}

.price-card.featured:hover {
  transform: scale(1.035) translateY(-6px);
}

.featured-ribbon {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #00f2fe, #3b82f6, #a855f7);
  color: #030816;
  font-size: 0.76rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  white-space: nowrap;
  box-shadow: 0 3px 12px rgba(0, 242, 254, 0.5);
}

.plan-header {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 20px;
  margin-bottom: 20px;
}

.plan-name-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: #ffffff;
}

.plan-badge {
  font-size: 0.74rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
}

.highlight-badge {
  background: rgba(0, 242, 254, 0.16);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 242, 254, 0.3);
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 40px;
  line-height: 1.45;
  margin-bottom: 16px;
}

.plan-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.currency {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.price-num {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 900;
  color: #ffffff;
  letter-spacing: -0.02em;
}

.price-cycle {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.plan-annual-tip {
  font-size: 0.78rem;
  color: var(--accent-emerald);
  margin-top: 6px;
  font-weight: 600;
}

.plan-specs {
  list-style: none;
  margin-bottom: 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.plan-specs li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: #cbd5e1;
  line-height: 1.45;
}

.plan-specs li svg {
  width: 17px;
  height: 17px;
  color: var(--accent-cyan);
  flex-shrink: 0;
  margin-top: 2px;
}

.plan-specs li strong {
  color: #ffffff;
}

/* ==========================================================================
   核心技术特性与架构
   ========================================================================== */
.features-section {
  padding: 80px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  transition: var(--transition);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-card);
}

.feature-icon-box {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--accent-cyan);
}

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

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #ffffff;
}

.feature-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ==========================================================================
   实测跑分与节点测速矩阵
   ========================================================================== */
.speedtest-section {
  padding: 70px 0;
}

.speed-table-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.speed-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
  min-width: 720px;
}

.speed-table th {
  background: rgba(14, 34, 68, 0.85);
  padding: 16px 20px;
  font-weight: 700;
  color: var(--accent-sky);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  letter-spacing: 0.5px;
}

.speed-table td {
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: #e2e8f0;
}

.speed-table tr:hover td {
  background: rgba(56, 189, 248, 0.05);
}

.node-flag-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.node-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-emerald);
  font-weight: 600;
}

.node-status-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-emerald);
}

/* ==========================================================================
   全平台客户端支持
   ========================================================================== */
.clients-section {
  padding: 70px 0;
  text-align: center;
}

.clients-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  margin-top: 36px;
}

.client-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px 16px;
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.client-item:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
}

.client-icon {
  font-size: 2rem;
}

.client-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
}

.client-os {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ==========================================================================
   深度推荐文章专栏 (7-8篇围绕关键词)
   ========================================================================== */
.articles-section {
  padding: 80px 0;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  text-decoration: none;
  color: inherit;
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-card);
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.article-category {
  padding: 3px 10px;
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent-sky);
  border-radius: var(--radius-full);
  font-weight: 600;
}

.article-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.45;
  margin-bottom: 12px;
  transition: var(--transition);
}

.article-card:hover h3 {
  color: var(--accent-cyan);
}

.article-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.article-tag {
  font-size: 0.74rem;
  padding: 2px 8px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 4px;
  color: #94a3b8;
}

.article-link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

.article-card:hover .article-link-arrow svg {
  transform: translateX(4px);
}

.article-link-arrow svg {
  width: 16px;
  height: 16px;
  transition: var(--transition);
}

/* ==========================================================================
   真实用户评价区
   ========================================================================== */
.reviews-section {
  padding: 80px 0;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: var(--transition);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
}

.review-stars {
  color: #facc15;
  font-size: 1.1rem;
  margin-bottom: 14px;
}

.review-text {
  font-size: 0.92rem;
  color: #cbd5e1;
  line-height: 1.65;
  margin-bottom: 20px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 16px;
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-sky), var(--accent-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  color: #ffffff;
}

.author-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: #ffffff;
}

.author-role {
  font-size: 0.78rem;
  color: var(--text-dim);
}

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

.faq-container {
  max-width: 860px;
  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: var(--transition);
}

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

.faq-question {
  padding: 22px 26px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  user-select: none;
  list-style: none;
}

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

.faq-icon {
  width: 22px;
  height: 22px;
  color: var(--accent-cyan);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

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

.faq-answer {
  padding: 0 26px 22px;
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   底部 CTA 横幅
   ========================================================================== */
.bottom-cta-section {
  padding: 60px 0 80px;
}

.bottom-cta-box {
  background: linear-gradient(135deg, rgba(14, 38, 77, 0.95) 0%, rgba(30, 27, 75, 0.9) 100%);
  border: 1px solid rgba(0, 242, 254, 0.4);
  border-radius: var(--radius-lg);
  padding: 56px 40px;
  text-align: center;
  box-shadow: 0 20px 50px -15px rgba(0, 0, 0, 0.7), 0 0 35px rgba(0, 242, 254, 0.25);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.bottom-cta-box h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 16px;
  color: #ffffff;
}

.bottom-cta-box p {
  font-size: 1.05rem;
  color: #cbd5e1;
  max-width: 680px;
  margin: 0 auto 32px;
}

/* ==========================================================================
   页脚与权威外链
   ========================================================================== */
.site-footer {
  background: #020610;
  border-top: 1px solid var(--border-subtle);
  padding: 64px 0 36px;
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 14px;
  line-height: 1.65;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}

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

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--accent-cyan);
  transform: translateX(2px);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* ==========================================================================
   响应式断点优化
   ========================================================================== */
@media (max-width: 1140px) {
  .pricing-row-container {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .clients-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-row-container {
    grid-template-columns: 1fr;
  }
  .price-card.featured {
    transform: none;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}