/* ==========================================================================
   飞机云 (feijicloud.buzz) - 高性能纯原生 CSS 样式系统
   100% 原生 CSS3 · 零外部重型 JS 依赖 · 秒开级极速加载 · GPU动态背景
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* 品牌核心配色：极光蓝、音速青与深空深色系 */
  --bg-deep: #030712;
  --bg-card: rgba(13, 23, 48, 0.75);
  --bg-card-hover: rgba(20, 36, 75, 0.9);
  --bg-glass: rgba(6, 12, 28, 0.82);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(56, 189, 248, 0.35);

  --cyan-primary: #00f2fe;
  --blue-primary: #38bdf8;
  --indigo-primary: #6366f1;
  --purple-primary: #818cf8;
  --emerald-accent: #10b981;
  --amber-accent: #f59e0b;
  --rose-accent: #f43f5e;

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

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

  --shadow-card: 0 12px 36px -10px rgba(0, 0, 0, 0.65);
  --shadow-glow: 0 0 28px rgba(0, 242, 254, 0.28);
  --shadow-btn: 0 8px 24px -6px rgba(254, 240, 138, 0.55), 0 0 16px rgba(253, 224, 71, 0.28);

  --container-max: 1240px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-family: var(--font-sans);
  background-color: #030614;
  color: var(--text-main);
  line-height: 1.65;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  background-color: transparent !important;
}

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

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

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

ul, ol {
  list-style: none;
}

/* ==========================================================================
   动态璀璨星空背景：各种各样的星星 (Dense Stars + Sparkling Stars + Meteors)
   100% 纯原生 CSS · GPU 加速 · 60fps 丝滑秒开 · 零 JS 负担
   ========================================================================== */
.dynamic-background {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  background: radial-gradient(ellipse 90% 65% at 50% 12%, #081a3e 0%, #04091e 50%, #020510 100%);
  pointer-events: none;
}

/* 深空宇宙极光星云 */
.dynamic-background::before {
  content: "";
  position: absolute;
  top: -10vh;
  left: 5vw;
  width: 90vw;
  height: 80vh;
  background: radial-gradient(ellipse 70% 60% at 50% 15%, rgba(254, 240, 138, 0.12) 0%, rgba(56, 189, 248, 0.15) 40%, rgba(99, 102, 241, 0.08) 75%, transparent 100%);
  filter: blur(60px);
  animation: auroraPulse 12s ease-in-out infinite alternate;
  will-change: opacity, transform;
}

/* 第一层：致密细小闪烁星辰 (Tiny Twinkling Stars) */
.stars-field-1 {
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle, #ffffff 1.5px, transparent 1.6px),
    radial-gradient(circle, #fef08a 2px, transparent 2.2px),
    radial-gradient(circle, #38bdf8 1.8px, transparent 2px),
    radial-gradient(circle, #ffffff 1.2px, transparent 1.5px),
    radial-gradient(circle, #fde047 2px, transparent 2.2px),
    radial-gradient(circle, #60a5fa 1.6px, transparent 1.8px),
    radial-gradient(circle, #ffffff 2.2px, transparent 2.5px),
    radial-gradient(circle, #00f2fe 1.8px, transparent 2px);
  background-position: 
    30px 40px, 120px 180px, 250px 80px, 380px 290px, 
    510px 140px, 640px 370px, 790px 60px, 920px 240px;
  background-size: 1050px 450px;
  background-repeat: repeat;
  animation: starTwinkle1 3.5s ease-in-out infinite alternate;
  opacity: 0.85;
}

/* 第二层：中号不同色彩与频率的群星 (Medium Colorful Stars) */
.stars-field-2 {
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle, #fef08a 2.5px, transparent 2.8px),
    radial-gradient(circle, #ffffff 2px, transparent 2.2px),
    radial-gradient(circle, #00f2fe 2.2px, transparent 2.5px),
    radial-gradient(circle, #fef9c3 3px, transparent 3.5px),
    radial-gradient(circle, #38bdf8 2px, transparent 2.3px),
    radial-gradient(circle, #ffffff 2.5px, transparent 2.8px);
  background-position: 
    75px 110px, 210px 320px, 430px 50px, 590px 260px, 740px 170px, 880px 380px;
  background-size: 960px 480px;
  background-repeat: repeat;
  animation: starTwinkle2 5s ease-in-out infinite alternate;
  opacity: 0.9;
}

/* 第三层：大号发光带光晕恒星 (Bright Glow Stars) */
.stars-field-3 {
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle, #ffffff 3px, rgba(254, 240, 138, 0.6) 4px, transparent 6px),
    radial-gradient(circle, #fef08a 3.5px, rgba(253, 224, 71, 0.6) 5px, transparent 8px),
    radial-gradient(circle, #38bdf8 3px, rgba(56, 189, 248, 0.6) 4px, transparent 7px);
  background-position: 160px 90px, 520px 310px, 860px 150px;
  background-size: 1100px 520px;
  background-repeat: repeat;
  animation: starTwinkle3 6s ease-in-out infinite alternate;
  opacity: 0.95;
}

/* 四芒与八芒璀璨钻石十字星 (Sparkling Diamond Cross Stars) */
.sparkle-star {
  position: absolute;
  width: 28px;
  height: 28px;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  will-change: transform, opacity;
}

.sparkle-star::before {
  content: "";
  position: absolute;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent 0%, var(--star-color, #ffffff) 50%, transparent 100%);
  border-radius: 999px;
  box-shadow: 0 0 12px var(--star-color, #ffffff), 0 0 20px var(--star-color, #ffffff);
}

.sparkle-star::after {
  content: "";
  position: absolute;
  height: 100%;
  width: 3px;
  background: linear-gradient(180deg, transparent 0%, var(--star-color, #ffffff) 50%, transparent 100%);
  border-radius: 999px;
  box-shadow: 0 0 12px var(--star-color, #ffffff), 0 0 20px var(--star-color, #ffffff);
}

.sparkle-star-center {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 0 10px #ffffff, 0 0 18px var(--star-color, #ffffff), 0 0 30px var(--star-color, #ffffff);
  z-index: 1;
}

/* 各位置与各形态四芒星 */
.star-1 {
  top: 14%;
  left: 12%;
  --star-color: #fef08a;
  transform: scale(0.95);
  animation: starPulseCross 4.5s ease-in-out infinite alternate;
}

.star-2 {
  top: 18%;
  right: 14%;
  --star-color: #ffffff;
  transform: scale(1.15);
  animation: starPulseCross 5.5s ease-in-out 1.2s infinite alternate;
}

.star-3 {
  top: 36%;
  left: 7%;
  --star-color: #38bdf8;
  transform: scale(0.9);
  animation: starPulseCross 6s ease-in-out 2.5s infinite alternate;
}

.star-4 {
  top: 44%;
  right: 9%;
  --star-color: #fde047;
  transform: scale(1.25);
  animation: starPulseCross 5s ease-in-out 0.8s infinite alternate;
}

.star-5 {
  top: 62%;
  left: 15%;
  --star-color: #00f2fe;
  transform: scale(1.0);
  animation: starPulseCross 4.8s ease-in-out 1.8s infinite alternate;
}

.star-6 {
  top: 72%;
  right: 16%;
  --star-color: #fffdf2;
  transform: scale(1.1);
  animation: starPulseCross 5.2s ease-in-out 3s infinite alternate;
}

.star-7 {
  top: 84%;
  left: 9%;
  --star-color: #fef9c3;
  transform: scale(0.85);
  animation: starPulseCross 4.2s ease-in-out 2.1s infinite alternate;
}

.star-8 {
  top: 26%;
  left: 48%;
  --star-color: #ffffff;
  transform: scale(0.8);
  animation: starPulseCross 6.5s ease-in-out 3.5s infinite alternate;
}

.star-9 {
  top: 28%;
  right: 26%;
  --star-color: #fef08a;
  transform: scale(0.95);
  animation: starPulseCross 4s ease-in-out 0.5s infinite alternate;
}

.star-10 {
  top: 48%;
  left: 26%;
  --star-color: #ffffff;
  transform: scale(1.1);
  animation: starPulseCross 5s ease-in-out 1.5s infinite alternate;
}

.star-11 {
  top: 15%;
  left: 35%;
  --star-color: #38bdf8;
  transform: scale(0.85);
  animation: starPulseCross 5.8s ease-in-out 2.8s infinite alternate;
}

.star-12 {
  top: 52%;
  right: 30%;
  --star-color: #fde047;
  transform: scale(1.15);
  animation: starPulseCross 4.6s ease-in-out 2s infinite alternate;
}

/* 八芒超级新星 (8-Point Nova Burst) */
.nova-star {
  position: absolute;
  width: 38px;
  height: 38px;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  will-change: transform, opacity;
}

.nova-star::before {
  content: "";
  position: absolute;
  width: 100%;
  height: 3.5px;
  background: linear-gradient(90deg, transparent, #ffffff, transparent);
  box-shadow: 0 0 14px #fef08a, 0 0 28px #fef08a;
  border-radius: 999px;
}

.nova-star::after {
  content: "";
  position: absolute;
  height: 100%;
  width: 3.5px;
  background: linear-gradient(180deg, transparent, #ffffff, transparent);
  box-shadow: 0 0 14px #fef08a, 0 0 28px #fef08a;
  border-radius: 999px;
}

.nova-star-ray {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: rotate(45deg);
}

.nova-star-ray::before {
  content: "";
  position: absolute;
  width: 75%;
  height: 2.5px;
  background: linear-gradient(90deg, transparent, #fef9c3, transparent);
  border-radius: 999px;
  box-shadow: 0 0 10px #fef08a;
}

.nova-star-ray::after {
  content: "";
  position: absolute;
  height: 75%;
  width: 2.5px;
  background: linear-gradient(180deg, transparent, #fef9c3, transparent);
  border-radius: 999px;
  box-shadow: 0 0 10px #fef08a;
}

.nova-1 {
  top: 15%;
  right: 22%;
  animation: novaBlink 7s ease-in-out infinite;
}

.nova-2 {
  top: 68%;
  left: 28%;
  transform: scale(0.9);
  animation: novaBlink 8s ease-in-out 3.5s infinite;
}

/* 动感流星划过夜空 (Shooting Stars / Meteors) */
.shooting-star {
  position: absolute;
  height: 3px;
  background: linear-gradient(to right, rgba(255, 255, 255, 0) 0%, rgba(254, 240, 138, 0.4) 30%, rgba(254, 240, 138, 0.9) 70%, #ffffff 100%);
  border-radius: 999px;
  box-shadow: 0 0 10px #ffffff, 0 0 20px #fef08a;
  transform: rotate(-35deg);
  opacity: 0;
  pointer-events: none;
  will-change: transform, opacity;
}

.meteor-1 {
  top: 8%;
  right: 15%;
  width: 170px;
  animation: meteorFly1 7s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.meteor-2 {
  top: 25%;
  right: 5%;
  width: 220px;
  animation: meteorFly2 10s cubic-bezier(0.2, 0.8, 0.2, 1) 2.5s infinite;
}

.meteor-3 {
  top: 48%;
  right: 20%;
  width: 150px;
  animation: meteorFly3 8.5s cubic-bezier(0.2, 0.8, 0.2, 1) 5s infinite;
}

@keyframes meteorFly1 {
  0% { transform: translate(0, 0) rotate(-35deg); opacity: 0; }
  10% { opacity: 1; }
  25% { transform: translate(-800px, 560px) rotate(-35deg); opacity: 0; }
  100% { transform: translate(-800px, 560px) rotate(-35deg); opacity: 0; }
}

@keyframes meteorFly2 {
  0% { transform: translate(0, 0) rotate(-35deg); opacity: 0; }
  12% { opacity: 1; }
  30% { transform: translate(-950px, 665px) rotate(-35deg); opacity: 0; }
  100% { transform: translate(-950px, 665px) rotate(-35deg); opacity: 0; }
}

@keyframes meteorFly3 {
  0% { transform: translate(0, 0) rotate(-35deg); opacity: 0; }
  10% { opacity: 1; }
  28% { transform: translate(-750px, 525px) rotate(-35deg); opacity: 0; }
  100% { transform: translate(-750px, 525px) rotate(-35deg); opacity: 0; }
}

/* 星星与流星关键帧动画 (GPU 加速) */
@keyframes starTwinkle1 {
  0% { opacity: 0.45; transform: scale(0.98); }
  50% { opacity: 1; transform: scale(1.03); }
  100% { opacity: 0.55; transform: scale(1); }
}

@keyframes starTwinkle2 {
  0% { opacity: 0.9; transform: scale(1.03); }
  50% { opacity: 0.4; transform: scale(0.97); }
  100% { opacity: 0.95; transform: scale(1.01); }
}

@keyframes starTwinkle3 {
  0% { opacity: 0.5; }
  50% { opacity: 1; }
  100% { opacity: 0.6; }
}

@keyframes starPulseCross {
  0% { opacity: 0.35; transform: scale(0.7) rotate(0deg); }
  50% { opacity: 1; transform: scale(1.3) rotate(45deg); }
  100% { opacity: 0.4; transform: scale(0.75) rotate(90deg); }
}

@keyframes novaBlink {
  0%, 100% { opacity: 0.3; transform: scale(0.75); }
  35% { opacity: 1; transform: scale(1.35); }
  55% { opacity: 0.85; transform: scale(1.1); }
}

/* 网格科技纹理与柔光浮动粒子 */
.bg-grid-overlay {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(56, 189, 248, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(56, 189, 248, 0.035) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(circle at 50% 30%, black 40%, transparent 85%);
  -webkit-mask-image: radial-gradient(circle at 50% 30%, black 40%, transparent 85%);
}

.plane-orb {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  will-change: transform;
}

.plane-orb-1 {
  top: 18%;
  left: 8%;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.12) 0%, transparent 70%);
  filter: blur(50px);
  animation: floatOrb1 18s ease-in-out infinite alternate;
}

.plane-orb-2 {
  top: 55%;
  right: 5%;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(129, 140, 248, 0.1) 0%, transparent 70%);
  filter: blur(65px);
  animation: floatOrb2 22s ease-in-out infinite alternate;
}

@keyframes auroraPulse {
  0% { transform: scale(1) translateY(0); opacity: 0.8; }
  50% { transform: scale(1.08) translateY(20px); opacity: 1; }
  100% { transform: scale(0.95) translateY(-15px); opacity: 0.85; }
}

@keyframes floatOrb1 {
  0% { transform: translate(0, 0); }
  100% { transform: translate(80px, 60px); }
}

@keyframes floatOrb2 {
  0% { transform: translate(0, 0); }
  100% { transform: translate(-70px, -80px); }
}

/* ==========================================================================
   页面容器与排版基准
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.text-grad {
  background: linear-gradient(135deg, #ffffff 15%, var(--blue-primary) 55%, var(--cyan-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.text-grad-alt {
  background: linear-gradient(135deg, var(--cyan-primary) 0%, var(--purple-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* 按钮规范与呼吁动作 (CTA) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  text-align: center;
  white-space: nowrap;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, #fffdf2 0%, #fef9c3 35%, #fef08a 70%, #fde047 100%);
  color: #030712;
  box-shadow: 0 8px 24px -6px rgba(254, 240, 138, 0.55), 0 0 16px rgba(253, 224, 71, 0.28);
  font-weight: 700;
}

.btn-primary:hover {
  transform: translateY(-2px);
  background: linear-gradient(135deg, #ffffff 0%, #fffde7 30%, #fef9c3 65%, #fef08a 100%);
  box-shadow: 0 12px 28px -6px rgba(254, 240, 138, 0.75), 0 0 24px rgba(253, 224, 71, 0.5);
  color: #000000;
}

.btn-glow {
  background: linear-gradient(135deg, #ffffff 0%, #fffde7 25%, #fef9c3 50%, #fef08a 75%, #fde047 100%);
  background-size: 200% 200%;
  color: #030712;
  font-weight: 800;
  box-shadow: 0 8px 26px -4px rgba(254, 240, 138, 0.6), 0 0 18px rgba(253, 224, 71, 0.35);
  animation: glowShiftYellow 4s ease infinite alternate;
}

.btn-glow:hover {
  transform: translateY(-2px) scale(1.02);
  background: linear-gradient(135deg, #ffffff 0%, #fffde7 30%, #fef08a 60%, #facc15 100%);
  box-shadow: 0 14px 34px -4px rgba(254, 240, 138, 0.8), 0 0 26px rgba(253, 224, 71, 0.55);
  color: #000000;
}

@keyframes glowShiftYellow {
  0% { background-position: 0% 50%; }
  100% { background-position: 100% 50%; }
}

.btn-outline {
  border: 1.5px solid var(--border-highlight);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  border-color: var(--cyan-primary);
  background: rgba(56, 189, 248, 0.12);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-lg {
  padding: 15px 32px;
  font-size: 16px;
  border-radius: var(--radius-full);
}

.btn-full {
  width: 100%;
}

/* ==========================================================================
   顶部导航栏（左上方高亮 Logo）
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-normal);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 20px;
}

.brand-logo-link {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-logo-img {
  height: 44px;
  width: auto;
  transition: transform var(--transition-fast);
}

.brand-logo-link:hover .brand-logo-img {
  transform: scale(1.03);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: #ffffff;
}

.nav-link.active::after, .nav-link:hover::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--cyan-primary);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* ==========================================================================
   页面区块基础排版 Section
   ========================================================================== */
.section, main, .cta-banner-section, .site-footer {
  position: relative;
  z-index: 1;
}

.section {
  padding: 85px 0;
}

.section-head {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 50px auto;
}

.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--cyan-primary);
  background: rgba(0, 242, 254, 0.1);
  padding: 5px 14px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(0, 242, 254, 0.25);
  margin-bottom: 14px;
}

.section-title {
  font-size: 34px;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.3;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   主视觉区 Hero Section
   ========================================================================== */
.hero-section {
  padding: 70px 0 90px 0;
  text-align: center;
}

.hero-badge-wrap {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(13, 23, 48, 0.85);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 8px 20px;
  border-radius: var(--radius-full);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--blue-primary);
  margin-bottom: 24px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

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

@keyframes dotPulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: 48px;
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 22px;
  color: #ffffff;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 860px;
  margin: 0 auto 34px auto;
  line-height: 1.8;
}

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

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 35px;
  flex-wrap: wrap;
}

.hero-guarantee {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 45px;
}

.hero-guarantee-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-guarantee-item span {
  color: var(--emerald-accent);
  font-weight: 800;
}

/* 监控指标条 */
.status-bar-wrap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(12px);
}

.status-stat-item {
  text-align: center;
  padding: 0 10px;
  border-right: 1px solid var(--border-subtle);
}

.status-stat-item:last-child {
  border-right: none;
}

.stat-value {
  font-size: 28px;
  font-weight: 800;
  font-family: var(--font-mono);
  line-height: 1.2;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
}

/* ==========================================================================
   核心优势卡片组 Features
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.feature-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--blue-primary), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

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

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

.feature-box-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 20px;
}

.feature-box-title {
  font-size: 19px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 10px;
}

.feature-box-desc {
  font-size: 14.5px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   价格套餐体系：严格要求“所有价格要同排” Pricing Section
   ========================================================================== */
.pricing-section {
  position: relative;
}

.pricing-notice-banner {
  max-width: 960px;
  margin: 0 auto 30px auto;
  background: rgba(56, 189, 248, 0.08);
  border: 1px dashed rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 14px;
  color: #bae6fd;
}

/* 核心：4列同排布局网格 (All 4 cards in the exact same row) */
.pricing-grid-same-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
  backdrop-filter: blur(12px);
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-highlight);
  background: var(--bg-card-hover);
  box-shadow: 0 16px 40px -10px rgba(0, 0, 0, 0.7), var(--shadow-glow);
}

/* 爆款高亮卡片 */
.pricing-card.is-popular {
  border-color: rgba(0, 242, 254, 0.55);
  background: linear-gradient(180deg, rgba(16, 32, 68, 0.9) 0%, rgba(10, 18, 38, 0.85) 100%);
  box-shadow: 0 12px 36px -10px rgba(0, 242, 254, 0.25);
}

.popular-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #00f2fe 0%, #38bdf8 100%);
  color: #030712;
  font-size: 12px;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(0, 242, 254, 0.4);
}

.card-header-block {
  margin-bottom: 18px;
}

.plan-tier-tag {
  display: inline-block;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--blue-primary);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 10px;
}

.pricing-card.is-popular .plan-tier-tag {
  color: var(--cyan-primary);
  border-color: rgba(0, 242, 254, 0.4);
  background: rgba(0, 242, 254, 0.15);
}

.plan-name {
  font-size: 22px;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
  min-height: 40px;
}

/* 价格展示框 */
.price-display-box {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 14px;
  margin-bottom: 20px;
}

.price-main {
  display: flex;
  align-items: baseline;
  justify-content: center;
  margin-bottom: 10px;
}

.price-currency {
  font-size: 20px;
  font-weight: 700;
  color: var(--cyan-primary);
  margin-right: 4px;
}

.price-amount {
  font-size: 40px;
  font-weight: 900;
  color: #ffffff;
  line-height: 1;
  font-family: var(--font-mono);
}

.price-cycle {
  font-size: 14px;
  color: var(--text-muted);
  margin-left: 6px;
}

.price-discount-list {
  font-size: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.price-discount-item {
  display: flex;
  justify-content: space-between;
  color: var(--text-muted);
}

.price-discount-item strong {
  color: var(--emerald-accent);
  font-weight: 600;
}

/* 特权清单 */
.plan-features-list {
  display: flex;
  flex-direction: column;
  gap: 11px;
  margin-bottom: 24px;
  flex-grow: 1;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-size: 13px;
  color: #e2e8f0;
  line-height: 1.45;
}

.feature-icon-check {
  width: 17px;
  height: 17px;
  color: var(--cyan-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.card-action-btn-wrap {
  margin-top: auto;
}

/* ==========================================================================
   节点矩阵表格 Nodes Section
   ========================================================================== */
.node-matrix-table-wrap {
  overflow-x: auto;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 10px;
  box-shadow: var(--shadow-card);
}

.node-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}

.node-table th, .node-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border-subtle);
}

.node-table th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 13px;
  background: rgba(0, 0, 0, 0.2);
}

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

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

.node-flag {
  font-size: 18px;
  margin-right: 8px;
}

.tag-status-online {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--emerald-accent);
  font-weight: 600;
  font-size: 12.5px;
}

.tag-status-online::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--emerald-accent);
  box-shadow: 0 0 6px var(--emerald-accent);
}

/* ==========================================================================
   客户端生态与支持 Clients Section
   ========================================================================== */
.client-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.client-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  text-align: center;
  transition: all var(--transition-normal);
}

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

.client-icon {
  font-size: 36px;
  margin-bottom: 12px;
}

.client-title {
  font-size: 17px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 6px;
}

.client-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ==========================================================================
   知识库文章网格（8篇高质量内部跳转文章） Articles Section
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

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

.article-tag-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.article-tag {
  font-size: 11px;
  font-weight: 600;
  color: var(--cyan-primary);
  background: rgba(0, 242, 254, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
}

.article-title-link {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.45;
  margin-bottom: 10px;
  transition: color var(--transition-fast);
}

.article-card:hover .article-title-link {
  color: var(--cyan-primary);
}

.article-excerpt {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-dim);
  border-top: 1px solid var(--border-subtle);
  padding-top: 12px;
}

/* ==========================================================================
   用户评价与真实使用场景 Reviews Section
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

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

.review-stars {
  color: #facc15;
  font-size: 16px;
  margin-bottom: 12px;
}

.review-quote {
  font-size: 14px;
  color: #e2e8f0;
  line-height: 1.7;
  margin-bottom: 18px;
  font-style: italic;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 14px;
}

.avatar-circle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue-primary) 0%, var(--purple-primary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #ffffff;
  font-size: 16px;
  flex-shrink: 0;
}

.author-info {
  line-height: 1.35;
}

.author-name {
  font-size: 14px;
  font-weight: 700;
  color: #ffffff;
}

.author-title {
  font-size: 12px;
  color: var(--text-muted);
}

/* ==========================================================================
   常见问题 FAQ Section (HTML 原生 details/summary 交互)
   ========================================================================== */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

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

.faq-question {
  padding: 18px 22px;
  font-size: 16px;
  font-weight: 700;
  color: #ffffff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

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

.faq-icon-arrow {
  width: 18px;
  height: 18px;
  color: var(--cyan-primary);
  transition: transform var(--transition-fast);
}

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

.faq-answer {
  padding: 0 22px 20px 22px;
  font-size: 14.5px;
  color: var(--text-muted);
  line-height: 1.75;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 4px;
  padding-top: 14px;
}

/* ==========================================================================
   底部呼吁横幅 CTA Banner
   ========================================================================== */
.cta-banner-section {
  padding: 60px 0;
}

.cta-banner-card {
  background: linear-gradient(135deg, rgba(14, 28, 62, 0.95) 0%, rgba(8, 16, 38, 0.95) 100%);
  border: 1.5px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 50px 40px;
  text-align: center;
  box-shadow: 0 20px 50px -15px rgba(0, 242, 254, 0.25);
  position: relative;
  overflow: hidden;
}

.cta-banner-title {
  font-size: 32px;
  font-weight: 900;
  color: #ffffff;
  margin-bottom: 12px;
}

.cta-banner-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 28px auto;
}

/* ==========================================================================
   网站底部 Footer & 外链/内链矩阵
   ========================================================================== */
.site-footer {
  background-color: #02050e;
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 35px 0;
  font-size: 14px;
  color: var(--text-muted);
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 35px;
  margin-bottom: 45px;
}

.footer-brand-desc {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-top: 14px;
  max-width: 340px;
}

.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
}

.footer-links-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-list a {
  color: var(--text-muted);
  font-size: 13.5px;
}

.footer-links-list a:hover {
  color: var(--cyan-primary);
  transform: translateX(3px);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 25px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12.5px;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 15px;
}

/* ==========================================================================
   文章详情页专有排版 Article Template Layout
   ========================================================================== */
.article-page-wrap {
  padding: 50px 0 80px 0;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 25px;
  flex-wrap: wrap;
}

.breadcrumb-nav a {
  color: var(--text-muted);
}

.breadcrumb-nav a:hover {
  color: var(--cyan-primary);
}

.article-header {
  margin-bottom: 35px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 25px;
}

.article-main-title {
  font-size: 36px;
  font-weight: 900;
  color: #ffffff;
  line-height: 1.35;
  margin-bottom: 18px;
}

.article-header-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 13.5px;
  color: var(--text-dim);
  flex-wrap: wrap;
}

.article-content {
  font-size: 16px;
  line-height: 1.85;
  color: #e2e8f0;
}

.article-content h2 {
  font-size: 26px;
  font-weight: 800;
  color: #ffffff;
  margin: 40px 0 16px 0;
  padding-left: 14px;
  border-left: 4px solid var(--cyan-primary);
}

.article-content h3 {
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  margin: 28px 0 12px 0;
}

.article-content p {
  margin-bottom: 20px;
}

.article-content strong {
  color: #ffffff;
}

.article-content ul, .article-content ol {
  margin: 15px 0 24px 20px;
}

.article-content ul li {
  list-style: disc;
  margin-bottom: 8px;
}

.article-content ol li {
  list-style: decimal;
  margin-bottom: 8px;
}

.article-callout {
  background: rgba(56, 189, 248, 0.08);
  border-left: 4px solid var(--cyan-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 18px 22px;
  margin: 28px 0;
  font-size: 15px;
  color: #bae6fd;
}

.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
}

.article-inline-cta {
  background: var(--bg-card);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  text-align: center;
  margin: 40px 0;
}

.article-nav-prev-next {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 50px 0 30px 0;
  border-top: 1px solid var(--border-subtle);
  padding-top: 30px;
}

.article-nav-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  transition: all var(--transition-normal);
}

.article-nav-box:hover {
  border-color: var(--border-highlight);
  background: var(--bg-card-hover);
}

.article-nav-label {
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.article-nav-link {
  font-size: 14.5px;
  font-weight: 600;
  color: #ffffff;
  display: block;
}

/* ==========================================================================
   响应式媒体查询 (严格保证桌面端价格4列同排，手机端自适应)
   ========================================================================== */
@media (max-width: 1100px) {
  .pricing-grid-same-row {
    gap: 14px;
  }
  .pricing-card {
    padding: 22px 16px;
  }
  .price-amount {
    font-size: 34px;
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .client-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: repeat(1, 1fr);
  }
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }
  .status-bar-wrap {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .status-stat-item:nth-child(2) {
    border-right: none;
  }
  /* 在宽平板下依然保持横向排布或平滑并列 */
  .pricing-grid-same-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 32px;
  }
  .hero-subtitle {
    font-size: 15px;
  }
  .section {
    padding: 55px 0;
  }
  .section-title {
    font-size: 26px;
  }
  .nav-menu {
    display: none;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid-same-row {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .client-grid {
    grid-template-columns: 1fr;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .status-bar-wrap {
    grid-template-columns: 1fr;
  }
  .status-stat-item {
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 12px;
  }
  .status-stat-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }
  .article-nav-prev-next {
    grid-template-columns: 1fr;
  }
  .cta-banner-card {
    padding: 35px 20px;
  }
}