/* =====================================================================
   NanoCloud · Holographic Cloud Console Design System
   Domain: nano-cloud.surf
   Framework: 02 | 全息云端控制台 (Cyan Holographic Console)
   ===================================================================== */

:root {
  --bg-dark: #060a13;
  --bg-deep: #080f1e;
  --bg-surface: rgba(13, 24, 46, 0.75);
  --bg-surface-hover: rgba(18, 34, 66, 0.85);
  --bg-glass: rgba(8, 17, 34, 0.65);
  
  --cyan-primary: #00f0ff;
  --cyan-glow: rgba(0, 240, 255, 0.35);
  --cyan-dim: rgba(0, 240, 255, 0.12);
  --cyan-border: rgba(0, 240, 255, 0.24);
  --cyan-border-bright: rgba(0, 240, 255, 0.65);
  
  --emerald-accent: #00f5a0;
  --emerald-dim: rgba(0, 245, 160, 0.15);
  --blue-accent: #3a86ff;
  --purple-accent: #8b5cf6;
  
  --text-white: #f5f9fc;
  --text-main: #d4e3f3;
  --text-muted: #8ca3be;
  --text-dim: #556c88;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", Consolas, "Liberation Mono", Menlo, Courier, monospace;
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  
  --shadow-hud: 0 0 25px rgba(0, 240, 255, 0.12), 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-neon: 0 0 16px rgba(0, 240, 255, 0.3);
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-base: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -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: 1.68;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Background Cyber Grid & Nebula */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(to right, rgba(0, 240, 255, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 240, 255, 0.04) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
  z-index: -2;
}

body::after {
  content: "";
  position: fixed;
  top: -15%;
  left: 20%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, rgba(0, 180, 255, 0.12) 0%, rgba(0, 240, 255, 0.03) 45%, transparent 70%);
  filter: blur(80px);
  pointer-events: none;
  z-index: -1;
}

a {
  color: var(--cyan-primary);
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

a:hover {
  color: #70f7ff;
}

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

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

@media (min-width: 768px) {
  .container {
    padding-left: 32px;
    padding-right: 32px;
  }
}

/* Monospace Utilities */
.mono {
  font-family: var(--font-mono);
}

/* =====================================================================
   HEADER & CONSOLE STATUS BAR
   ===================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(6, 10, 19, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--cyan-border);
  transition: all var(--transition-fast);
}

.top-telemetry-bar {
  display: none;
  background: rgba(0, 240, 255, 0.05);
  border-bottom: 1px solid rgba(0, 240, 255, 0.12);
  padding: 4px 0;
  font-size: 11px;
  color: var(--text-muted);
}

@media (min-width: 768px) {
  .top-telemetry-bar {
    display: block;
  }
}

.telemetry-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.telemetry-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--emerald-accent);
  box-shadow: 0 0 8px var(--emerald-accent);
  display: inline-block;
  animation: pulse 2.2s infinite;
}

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

.header-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

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

.brand-logo-img {
  height: 42px;
  width: auto;
}

.nav-desktop {
  display: none;
}

@media (min-width: 992px) {
  .nav-desktop {
    display: flex;
    align-items: center;
    gap: 28px;
  }
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-main);
  position: relative;
  padding: 6px 0;
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--cyan-primary);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--cyan-primary);
  box-shadow: 0 0 8px var(--cyan-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Mobile Toggle */
.mobile-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: var(--cyan-dim);
  border: 1px solid var(--cyan-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 8px;
}

@media (min-width: 992px) {
  .mobile-toggle {
    display: none;
  }
}

.mobile-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--cyan-primary);
  transition: all var(--transition-fast);
}

.mobile-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-toggle.open span:nth-child(2) {
  opacity: 0;
}
.mobile-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  top: 69px;
  left: 0;
  width: 100%;
  height: calc(100vh - 69px);
  background: rgba(6, 10, 19, 0.98);
  backdrop-filter: blur(20px);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transform: translateX(-100%);
  transition: transform var(--transition-base);
  z-index: 999;
  border-right: 1px solid var(--cyan-border);
  overflow-y: auto;
}

.mobile-drawer.open {
  transform: translateX(0);
}

.mobile-drawer .nav-link {
  font-size: 16px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: rgba(13, 24, 46, 0.5);
  border: 1px solid rgba(0, 240, 255, 0.1);
  display: block;
}

.mobile-drawer .nav-link:hover, .mobile-drawer .nav-link.active {
  background: rgba(0, 240, 255, 0.12);
  border-color: var(--cyan-primary);
}

/* =====================================================================
   BUTTONS (Strict copy: “注册 / 查看套餐”, “进入服务入口”, “开始使用”)
   ===================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  font-family: var(--font-sans);
}

.btn-primary {
  background: linear-gradient(135deg, #00d2ff 0%, #0077ff 100%);
  color: #ffffff;
  border: 1px solid rgba(0, 240, 255, 0.6);
  box-shadow: 0 0 16px rgba(0, 210, 255, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #24ddff 0%, #1e8aff 100%);
  color: #ffffff;
  box-shadow: 0 0 24px rgba(0, 240, 255, 0.6);
  transform: translateY(-1px);
}

.btn-outline {
  background: rgba(0, 240, 255, 0.06);
  color: var(--cyan-primary);
  border: 1px solid var(--cyan-border);
}

.btn-outline:hover {
  background: rgba(0, 240, 255, 0.16);
  border-color: var(--cyan-primary);
  color: #ffffff;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
  border-radius: var(--radius-md);
}

/* =====================================================================
   BREADCRUMBS
   ===================================================================== */
.breadcrumb-nav {
  padding: 16px 0 8px 0;
  font-size: 13px;
  color: var(--text-dim);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  gap: 8px;
}

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

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

.breadcrumb-item.active {
  color: var(--cyan-primary);
  font-weight: 500;
}

.breadcrumb-separator {
  color: var(--text-dim);
  user-select: none;
}

/* =====================================================================
   HERO / BANNER SECTION
   ===================================================================== */
.hero-section {
  padding: 48px 0 64px 0;
  position: relative;
}

@media (min-width: 768px) {
  .hero-section {
    padding: 72px 0 96px 0;
  }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

@media (min-width: 992px) {
  .hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
  }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid var(--cyan-border);
  font-size: 12px;
  color: var(--cyan-primary);
  margin-bottom: 20px;
}

.hero-title {
  font-size: 28px;
  line-height: 1.25;
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

@media (min-width: 375px) {
  .hero-title {
    font-size: 32px;
  }
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 42px;
  }
}

@media (min-width: 1024px) {
  .hero-title {
    font-size: 46px;
  }
}

.text-gradient {
  background: linear-gradient(135deg, #00f0ff 20%, #4facfe 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-bottom: 28px;
}

.hero-meta-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 13px;
  color: var(--text-dim);
}

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

/* Hero Terminal HUD Display Card */
.hud-console-card {
  background: var(--bg-surface);
  border: 1px solid var(--cyan-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-hud);
  overflow: hidden;
  position: relative;
}

.hud-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0, 240, 255, 0.06);
  padding: 12px 16px;
  border-bottom: 1px solid var(--cyan-border);
}

.hud-dots {
  display: flex;
  gap: 6px;
}

.hud-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.hud-dot.red { background: #ff5f56; }
.hud-dot.yellow { background: #ffbd2e; }
.hud-dot.green { background: #27c93f; }

.hud-terminal-title {
  font-size: 12px;
  color: var(--cyan-primary);
  font-family: var(--font-mono);
}

.hud-body {
  padding: 20px;
}

.hud-metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 18px;
}

.metric-pill {
  background: rgba(6, 10, 19, 0.7);
  border: 1px solid rgba(0, 240, 255, 0.15);
  border-radius: var(--radius-sm);
  padding: 12px;
}

.metric-pill .label {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 4px;
  font-family: var(--font-mono);
}

.metric-pill .val {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-white);
  font-family: var(--font-mono);
}

.metric-pill .val.highlight {
  color: var(--cyan-primary);
}

.hud-status-stream {
  background: rgba(0, 0, 0, 0.45);
  border-radius: var(--radius-sm);
  padding: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  color: var(--text-muted);
  border-left: 2px solid var(--cyan-primary);
}

.hud-status-stream span.time {
  color: var(--text-dim);
  margin-right: 8px;
}

.hud-status-stream span.ok {
  color: var(--emerald-accent);
}

/* =====================================================================
   SECTION SHARED STYLES
   ===================================================================== */
.section {
  padding: 64px 0;
  position: relative;
}

@media (min-width: 768px) {
  .section {
    padding: 88px 0;
  }
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px auto;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  color: var(--cyan-primary);
  letter-spacing: 1.5px;
  margin-bottom: 10px;
  background: var(--cyan-dim);
  padding: 4px 12px;
  border-radius: 4px;
  border: 1px solid var(--cyan-border);
}

.section-title {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 14px;
}

@media (min-width: 768px) {
  .section-title {
    font-size: 34px;
  }
}

.section-subtitle {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* =====================================================================
   PLANS / PRICING SECTION (Strict Reference Data)
   ¥1/100GB, ¥10/300GB, ¥15/480GB, ¥20/650GB
   ===================================================================== */
.plans-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 600px) {
  .plans-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .plans-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.plan-card {
  background: var(--bg-surface);
  border: 1px solid var(--cyan-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-base);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.plan-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan-border-bright);
  box-shadow: var(--shadow-hud);
}

.plan-card.popular {
  border-color: var(--cyan-primary);
  background: linear-gradient(180deg, rgba(16, 32, 62, 0.9) 0%, rgba(10, 18, 36, 0.8) 100%);
}

.plan-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background: linear-gradient(135deg, #00f0ff 0%, #0077ff 100%);
  color: #060a13;
  font-weight: 800;
  font-size: 11px;
  letter-spacing: 0.5px;
  padding: 3px 10px;
  border-radius: 999px;
  text-transform: uppercase;
}

.plan-tier-code {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan-primary);
  margin-bottom: 6px;
}

.plan-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 12px;
}

.plan-price-wrap {
  margin-bottom: 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.plan-price {
  font-size: 34px;
  font-weight: 800;
  color: var(--text-white);
  font-family: var(--font-sans);
}

.plan-period {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 400;
}

.plan-feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13.5px;
  color: var(--text-main);
  line-height: 1.45;
}

.feature-check {
  color: var(--cyan-primary);
  flex-shrink: 0;
  margin-top: 1px;
}

.feature-note {
  font-size: 11.5px;
  color: var(--text-dim);
  display: block;
}

.plan-btn-wrap {
  margin-top: auto;
}

.plan-btn-wrap .btn {
  width: 100%;
}

.pricing-notice-box {
  margin-top: 36px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  background: rgba(0, 240, 255, 0.04);
  border: 1px solid rgba(0, 240, 255, 0.16);
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: flex-start;
  gap: 12px;
  line-height: 1.6;
}

/* =====================================================================
   INTERACTIVE TRAFFIC CALCULATOR WIDGET
   ===================================================================== */
.calculator-card {
  background: var(--bg-surface);
  border: 1px solid var(--cyan-border);
  border-radius: var(--radius-xl);
  padding: 32px 24px;
  box-shadow: var(--shadow-hud);
}

@media (min-width: 768px) {
  .calculator-card {
    padding: 40px;
  }
}

.calculator-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

@media (min-width: 992px) {
  .calculator-grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
  }
}

.calc-sliders {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.slider-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
}

.slider-title {
  color: var(--text-white);
  font-weight: 600;
}

.slider-val-badge {
  font-family: var(--font-mono);
  color: var(--cyan-primary);
  font-weight: 700;
  background: var(--cyan-dim);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 13px;
}

input[type="range"].cyber-range {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: rgba(0, 240, 255, 0.15);
  border-radius: 3px;
  outline: none;
}

input[type="range"].cyber-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--cyan-primary);
  box-shadow: 0 0 10px var(--cyan-primary);
  cursor: pointer;
  transition: transform 0.1s ease;
}

input[type="range"].cyber-range::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.calc-result-panel {
  background: rgba(6, 10, 19, 0.85);
  border: 1px solid var(--cyan-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.calc-est-label {
  font-size: 12px;
  text-transform: uppercase;
  color: var(--text-dim);
  font-family: var(--font-mono);
  margin-bottom: 6px;
}

.calc-est-number {
  font-size: 38px;
  font-weight: 800;
  color: var(--emerald-accent);
  font-family: var(--font-mono);
  line-height: 1.1;
  margin-bottom: 16px;
}

.calc-rec-box {
  padding: 16px;
  background: rgba(0, 240, 255, 0.06);
  border-radius: var(--radius-md);
  border: 1px solid var(--cyan-border);
  margin-bottom: 20px;
}

.calc-rec-title {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.calc-rec-plan {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-white);
}

/* =====================================================================
   ARTICLES & BLOG SECTION / LIST / SINGLE POST
   ===================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 600px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.article-card {
  background: var(--bg-surface);
  border: 1px solid var(--cyan-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-base);
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan-border-bright);
  box-shadow: var(--shadow-hud);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 12px;
  font-family: var(--font-mono);
}

.article-card-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-white);
  line-height: 1.4;
  margin-bottom: 12px;
}

.article-card-title a {
  color: var(--text-white);
}

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

.article-card-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 13px;
}

.read-more-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--cyan-primary);
  font-weight: 600;
}

/* Article Single Post Layout */
.article-single-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  margin-top: 24px;
}

@media (min-width: 992px) {
  .article-single-wrap {
    grid-template-columns: 1fr 300px;
  }
}

.article-content-box {
  background: var(--bg-surface);
  border: 1px solid var(--cyan-border);
  border-radius: var(--radius-xl);
  padding: 28px 20px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

@media (min-width: 768px) {
  .article-content-box {
    padding: 44px 36px;
  }
}

.article-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.article-header h1 {
  font-size: 26px;
  line-height: 1.3;
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 16px;
}

@media (min-width: 768px) {
  .article-header h1 {
    font-size: 34px;
  }
}

.article-author-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
}

.author-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--cyan-primary);
  font-weight: 600;
}

/* Table of contents inside article or sidebar */
.toc-box {
  background: rgba(6, 10, 19, 0.7);
  border: 1px solid var(--cyan-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 32px;
}

.toc-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--cyan-primary);
  text-transform: uppercase;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toc-list li a {
  font-size: 14px;
  color: var(--text-muted);
  display: block;
  padding-left: 10px;
  border-left: 2px solid transparent;
  transition: all var(--transition-fast);
}

.toc-list li a:hover {
  color: var(--cyan-primary);
  border-left-color: var(--cyan-primary);
}

/* Article Prose (GEO Optimized) */
.prose {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-main);
}

.prose h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-white);
  margin-top: 40px;
  margin-bottom: 14px;
  padding-left: 14px;
  border-left: 3px solid var(--cyan-primary);
  letter-spacing: -0.01em;
}

@media (min-width: 768px) {
  .prose h2 {
    font-size: 25px;
  }
}

.prose h3 {
  font-size: 18px;
  font-weight: 600;
  color: #cbe3f7;
  margin-top: 24px;
  margin-bottom: 10px;
}

.prose p {
  margin-bottom: 18px;
  color: #c0d3e8;
}

.prose strong {
  color: var(--text-white);
}

.prose ul, .prose ol {
  margin-bottom: 22px;
  padding-left: 22px;
}

.prose li {
  margin-bottom: 8px;
  color: #c0d3e8;
}

/* Cyber Data Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 24px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--cyan-border);
}

.cyber-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
  background: rgba(8, 14, 28, 0.7);
}

.cyber-table th, .cyber-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(0, 240, 255, 0.12);
}

.cyber-table th {
  background: rgba(0, 240, 255, 0.08);
  color: var(--cyan-primary);
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: 13px;
  white-space: nowrap;
}

.cyber-table tr:hover {
  background: rgba(0, 240, 255, 0.04);
}

.cyber-table td {
  color: var(--text-main);
}

/* Callout Info Box */
.callout-box {
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: var(--radius-md);
  background: rgba(0, 240, 255, 0.05);
  border-left: 3px solid var(--cyan-primary);
  font-size: 14px;
  color: var(--text-main);
}

.callout-box.tip {
  border-left-color: var(--emerald-accent);
  background: rgba(0, 245, 160, 0.05);
}

/* Internal link pill */
.internal-link-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid var(--cyan-border);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  color: var(--cyan-primary);
  margin: 2px 4px 2px 0;
  transition: all var(--transition-fast);
}

.internal-link-pill:hover {
  background: rgba(0, 240, 255, 0.2);
  border-color: var(--cyan-primary);
}

/* Article Sidebar Widget */
.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-card {
  background: var(--bg-surface);
  border: 1px solid var(--cyan-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.sidebar-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.related-articles-list li a {
  font-size: 14px;
  color: var(--text-muted);
  display: block;
  line-height: 1.45;
  transition: color var(--transition-fast);
}

.related-articles-list li a:hover {
  color: var(--cyan-primary);
}

/* =====================================================================
   FAQ ACCORDION COMPONENT
   ===================================================================== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
}

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

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

.faq-question {
  width: 100%;
  padding: 18px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  color: var(--text-white);
  font-size: 16px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-sans);
}

.faq-icon {
  color: var(--cyan-primary);
  font-size: 18px;
  transition: transform var(--transition-fast);
  flex-shrink: 0;
  margin-left: 12px;
}

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

.faq-answer {
  display: none;
  padding: 0 20px 20px 20px;
  color: var(--text-muted);
  font-size: 14.5px;
  line-height: 1.7;
  border-top: 1px solid rgba(0, 240, 255, 0.08);
  margin-top: 4px;
}

.faq-item.active .faq-answer {
  display: block;
}

/* =====================================================================
   USER FEEDBACK SECTION (用户反馈 / 提交使用体验)
   Strict compliance: No fake 5-star ratings, real submission interface
   ===================================================================== */
.feedback-card {
  background: var(--bg-surface);
  border: 1px solid var(--cyan-border);
  border-radius: var(--radius-xl);
  padding: 32px 24px;
  box-shadow: var(--shadow-hud);
}

@media (min-width: 768px) {
  .feedback-card {
    padding: 40px;
  }
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-white);
  margin-bottom: 8px;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  background: rgba(6, 10, 19, 0.7);
  border: 1px solid var(--cyan-border);
  border-radius: var(--radius-sm);
  color: var(--text-white);
  font-family: var(--font-sans);
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  border-color: var(--cyan-primary);
  box-shadow: 0 0 10px rgba(0, 240, 255, 0.2);
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
}

/* =====================================================================
   FOOTER
   ===================================================================== */
.site-footer {
  background: rgba(4, 7, 14, 0.95);
  border-top: 1px solid var(--cyan-border);
  padding: 64px 0 24px 0;
  margin-top: 64px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  margin-bottom: 48px;
}

@media (min-width: 600px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
  }
}

.footer-col-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-white);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 18px;
  font-family: var(--font-mono);
}

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

.footer-links a {
  font-size: 14px;
  color: var(--text-muted);
}

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

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 12px;
  color: var(--text-dim);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.footer-disclaimer {
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.6;
  margin-top: 10px;
}

/* =====================================================================
   RESPONSIVE UTILITIES (320px, 375px, 390px, 768px, 1024px)
   ===================================================================== */
@media (max-width: 360px) {
  .hero-title {
    font-size: 24px;
  }
  .btn {
    padding: 8px 14px;
    font-size: 13px;
  }
  .plan-price {
    font-size: 28px;
  }
  .hud-metrics-grid {
    grid-template-columns: 1fr;
  }
}