/* ==========================================================================
   sufe机场首页 (sufe.my) - 半透明磨砂叠层流 (Frosted Layer Stack)
   Color System:
     Base Canvas: #F1F5F9
     Frosted Panel: rgba(255, 255, 255, 0.75) + blur(20px)
     Frosted Border: rgba(255, 255, 255, 0.8)
     Primary Text: #334155
   ========================================================================== */

:root {
  --bg-base: #F1F5F9;
  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-bg-soft: rgba(255, 255, 255, 0.56);
  --glass-bg-strong: rgba(255, 255, 255, 0.86);
  --glass-border: rgba(255, 255, 255, 0.8);
  --glass-border-subtle: rgba(255, 255, 255, 0.55);
  --glass-border-hover: rgba(14, 165, 233, 0.55);
  --text-main: #334155;
  --text-strong: #1E293B;
  --text-muted: #64748B;
  --accent-ice: #0284C7;
  --accent-cyan: #0EA5E9;
  --accent-teal: #0D9488;
  --shadow-glass: 0 20px 50px -15px rgba(51, 65, 85, 0.08), 0 4px 16px -4px rgba(51, 65, 85, 0.04);
  --shadow-glass-lg: 0 30px 70px -20px rgba(30, 41, 59, 0.12), 0 8px 24px -6px rgba(51, 65, 85, 0.05);
  --radius-layer: 24px;
  --radius-capsule: 32px;
  --radius-pill: 9999px;
  --blur-amount: 20px;
  --max-width: 1160px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  background-color: var(--bg-base);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg-base);
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: clip;
  position: relative;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  background: transparent;
  border: none;
}

/* ==========================================================================
   Dynamic Background Layer (Canvas + Ambient Mesh Orbs)
   ========================================================================== */
.dynamic-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  background: radial-gradient(circle at 18% 12%, rgba(224, 242, 254, 0.85) 0%, rgba(241, 245, 249, 0.9) 48%, #F1F5F9 100%);
}

#bg-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(72px);
  opacity: 0.65;
  will-change: transform;
}

.bg-orb-1 {
  width: 56vw;
  height: 56vw;
  max-width: 680px;
  max-height: 680px;
  top: -14%;
  left: -10%;
  background: radial-gradient(circle, rgba(186, 230, 253, 0.85), rgba(224, 242, 254, 0));
  animation: orbFloatA 22s ease-in-out infinite alternate;
}

.bg-orb-2 {
  width: 50vw;
  height: 50vw;
  max-width: 620px;
  max-height: 620px;
  top: 28%;
  right: -12%;
  background: radial-gradient(circle, rgba(207, 250, 254, 0.8), rgba(203, 213, 225, 0.15));
  animation: orbFloatB 26s ease-in-out infinite alternate;
}

.bg-orb-3 {
  width: 48vw;
  height: 48vw;
  max-width: 580px;
  max-height: 580px;
  bottom: -16%;
  left: 24%;
  background: radial-gradient(circle, rgba(226, 232, 240, 0.95), rgba(186, 230, 253, 0.35));
  animation: orbFloatC 20s ease-in-out infinite alternate;
}

.bg-grid-sheen {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(148, 163, 184, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(148, 163, 184, 0.08) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 35%, rgba(0, 0, 0, 0.7), transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 35%, rgba(0, 0, 0, 0.7), transparent 100%);
}

@keyframes orbFloatA {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(6vw, 5vh, 0) scale(1.08); }
}

@keyframes orbFloatB {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(-7vw, -6vh, 0) scale(1.1); }
}

@keyframes orbFloatC {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(5vw, -7vh, 0) scale(1.06); }
}

/* ==========================================================================
   Frosted Glass Primitives (No Solid Blocks)
   ========================================================================== */
.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass);
}

.glass-pill {
  background: rgba(255, 255, 255, 0.68);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
}

.glass-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  color: var(--text-strong);
  font-weight: 600;
  font-size: 0.94rem;
  letter-spacing: 0.01em;
  transition: border-color 0.25s ease, background-color 0.25s ease, transform 0.2s ease, box-shadow 0.25s ease;
}

.glass-btn:hover {
  border-color: rgba(14, 165, 233, 0.65);
  background: rgba(255, 255, 255, 0.88);
  transform: translateY(-1px);
  box-shadow: 0 10px 26px -10px rgba(14, 165, 233, 0.25);
}

.glass-btn-primary {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.88), rgba(224, 242, 254, 0.78));
  border: 1px solid rgba(14, 165, 233, 0.45);
  color: #0F172A;
  box-shadow: 0 12px 30px -12px rgba(2, 132, 199, 0.22);
}

.glass-btn-primary:hover {
  border-color: rgba(2, 132, 199, 0.85);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(224, 242, 254, 0.9));
}

.container {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ==========================================================================
   Top Frosted Navigation Bar
   ========================================================================== */
.site-header {
  position: sticky;
  top: 14px;
  z-index: 100;
  padding: 0 20px;
  margin-bottom: 18px;
}

.nav-shell {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 10px 16px 10px 20px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  box-shadow: 0 12px 32px -12px rgba(51, 65, 85, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.04rem;
  color: var(--text-strong);
  white-space: nowrap;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(14, 165, 233, 0.4);
  display: grid;
  place-items: center;
  color: var(--accent-ice);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.nav-links a {
  padding: 7px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-main);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  background: rgba(255, 255, 255, 0.78);
  border-color: rgba(255, 255, 255, 0.9);
  color: var(--accent-ice);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-cta {
  padding: 8px 16px;
  font-size: 0.86rem;
  white-space: nowrap;
}

.mobile-menu-btn {
  display: none;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid var(--glass-border);
  align-items: center;
  justify-content: center;
}

.mobile-drawer {
  display: none;
  max-width: var(--max-width);
  margin: 10px auto 0;
  padding: 14px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.84);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass);
}

.mobile-drawer.open {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.mobile-drawer a {
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--glass-border-subtle);
  font-size: 0.9rem;
  font-weight: 500;
  text-align: center;
}

/* ==========================================================================
   Hero Slogan & Highlights
   ========================================================================== */
.hero-section {
  padding: 36px 0 34px;
  text-align: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--accent-ice);
  margin-bottom: 20px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10B981;
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.18);
  animation: pulseDot 2.2s ease-in-out infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.65; transform: scale(1.15); }
}

.hero-title {
  font-size: clamp(2rem, 4.3vw, 3.35rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-strong);
  max-width: 860px;
  margin: 0 auto 18px;
}

.hero-title span {
  background: linear-gradient(120deg, #0F172A 0%, #0284C7 55%, #0D9488 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-subtitle {
  max-width: 720px;
  margin: 0 auto 26px;
  font-size: clamp(1rem, 1.4vw, 1.12rem);
  color: var(--text-main);
  opacity: 0.92;
}

.hero-cta-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 28px;
}

.hero-highlights {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  max-width: 980px;
  margin: 0 auto;
}

.highlight-chip {
  padding: 14px 16px;
  border-radius: 18px;
  text-align: left;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.highlight-chip:hover {
  border-color: rgba(14, 165, 233, 0.55);
  transform: translateY(-2px);
}

.highlight-chip strong {
  display: block;
  font-size: 0.96rem;
  color: var(--text-strong);
  margin-bottom: 3px;
}

.highlight-chip span {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   3-Card Frosted Layer Stack (Sticky Overlapping Architecture)
   ========================================================================== */
.frosted-stack {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 38px;
  padding: 16px 0 36px;
}

.layer-slot {
  position: relative;
}

.layer-card {
  position: sticky;
  top: 86px;
  border-radius: var(--radius-layer);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass-lg);
  padding: 36px;
  transition: transform 0.35s ease, opacity 0.35s ease, border-color 0.3s ease;
  will-change: transform;
}

.layer-card-1 { z-index: 10; }
.layer-card-2 { z-index: 20; }
.layer-card-3 { z-index: 30; }

.layer-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 26px;
}

.layer-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--glass-border);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-ice);
  margin-bottom: 10px;
}

.layer-title {
  font-size: clamp(1.38rem, 2.2vw, 1.85rem);
  font-weight: 700;
  color: var(--text-strong);
  line-height: 1.3;
}

.layer-desc {
  font-size: 0.94rem;
  color: var(--text-muted);
  max-width: 560px;
}

/* --- Layer 1: Node Latency Gauges & Status --- */
.telemetry-grid {
  display: grid;
  grid-template-columns: 310px minmax(0, 1fr);
  gap: 24px;
  align-items: stretch;
}

.gauge-panel {
  border-radius: 20px;
  padding: 24px 20px;
  background: rgba(255, 255, 255, 0.52);
  border: 1px solid var(--glass-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.gauge-ring-wrap {
  position: relative;
  width: 184px;
  height: 184px;
  margin-bottom: 14px;
}

.gauge-ring-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.gauge-track {
  fill: none;
  stroke: rgba(148, 163, 184, 0.22);
  stroke-width: 11;
}

.gauge-progress {
  fill: none;
  stroke: url(#gaugeGrad);
  stroke-width: 11;
  stroke-linecap: round;
  stroke-dasharray: 440;
  stroke-dashoffset: 68;
  transition: stroke-dashoffset 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.gauge-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.gauge-value {
  font-size: 2.1rem;
  font-weight: 700;
  color: var(--text-strong);
  line-height: 1.1;
}

.gauge-unit {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.gauge-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  width: 100%;
  margin-top: 12px;
}

.gauge-stat {
  padding: 9px 10px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid var(--glass-border);
}

.gauge-stat span {
  display: block;
  font-size: 0.74rem;
  color: var(--text-muted);
}

.gauge-stat strong {
  font-size: 0.94rem;
  color: var(--text-strong);
}

.nodes-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.node-filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.filter-tab {
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--glass-border);
  font-size: 0.83rem;
  font-weight: 500;
  color: var(--text-main);
  transition: all 0.2s ease;
}

.filter-tab.active,
.filter-tab:hover {
  background: rgba(255, 255, 255, 0.92);
  border-color: rgba(14, 165, 233, 0.6);
  color: var(--accent-ice);
}

.node-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.node-item {
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: border-color 0.22s ease, transform 0.22s ease;
}

.node-item:hover {
  border-color: rgba(14, 165, 233, 0.55);
  transform: translateY(-1px);
}

.node-info strong {
  display: block;
  font-size: 0.94rem;
  color: var(--text-strong);
}

.node-info span {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.node-metrics {
  text-align: right;
  flex-shrink: 0;
}

.node-ping {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--accent-teal);
}

.node-ping::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
}

.node-ping.mid {
  color: var(--accent-ice);
}

.node-load {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --- Layer 2: Protocols & Devices + In-Place Download Drawer --- */
.device-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.device-card {
  padding: 26px 22px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid var(--glass-border);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  transition: border-color 0.25s ease, background-color 0.25s ease, transform 0.22s ease;
}

.device-card:hover,
.device-card.active {
  background: rgba(255, 255, 255, 0.86);
  border-color: rgba(14, 165, 233, 0.7);
  transform: translateY(-2px);
}

.device-icon-box {
  width: 58px;
  height: 58px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid var(--glass-border);
  display: grid;
  place-items: center;
  color: var(--text-strong);
}

.device-card h3 {
  font-size: 1.1rem;
  color: var(--text-strong);
}

.device-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.device-hint {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-ice);
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--glass-border);
}

.download-drawer {
  margin-top: 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.68);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  padding: 0 24px;
  transition: max-height 0.4s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.3s ease, padding 0.3s ease, margin-top 0.3s ease;
}

.download-drawer.open {
  max-height: 460px;
  opacity: 1;
  padding: 22px 24px;
}

.drawer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.22);
  margin-bottom: 16px;
}

.drawer-top h4 {
  font-size: 1.08rem;
  color: var(--text-strong);
}

.drawer-close {
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--glass-border);
  font-size: 0.8rem;
}

.drawer-body {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 20px;
  align-items: center;
}

.drawer-specs {
  list-style: none;
  display: grid;
  gap: 8px;
  font-size: 0.9rem;
}

.drawer-specs li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.drawer-specs strong {
  color: var(--text-strong);
  min-width: 84px;
}

.drawer-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-start;
}

.protocol-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.protocol-tag {
  padding: 5px 13px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.56);
  border: 1px solid var(--glass-border);
  font-size: 0.8rem;
  color: var(--text-main);
}

/* --- Layer 3: Transparent Subscription Capsules --- */
.pricing-capsules {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  align-items: stretch;
}

.capsule-card {
  border-radius: var(--radius-capsule);
  background: rgba(255, 255, 255, 0.62);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.8);
  padding: 30px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.28s ease;
}

/* Hover rule per spec: 鼠标悬浮时仅有细边框微微提亮 */
.capsule-card:hover {
  border-color: rgba(14, 165, 233, 0.92);
}

.capsule-plan {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.capsule-plan h3 {
  font-size: 1.15rem;
  color: var(--text-strong);
}

.capsule-tag {
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--glass-border);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-ice);
}

.capsule-price {
  margin-bottom: 18px;
}

.capsule-price .amount {
  font-size: 2.45rem;
  font-weight: 700;
  color: var(--text-strong);
  letter-spacing: -0.02em;
}

.capsule-price .period {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-left: 4px;
}

.capsule-features {
  list-style: none;
  display: grid;
  gap: 10px;
  margin-bottom: 24px;
  font-size: 0.9rem;
}

.capsule-features li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.check-icon {
  width: 17px;
  height: 17px;
  color: var(--accent-ice);
  flex-shrink: 0;
}

.capsule-cta {
  width: 100%;
  text-align: center;
}

/* ==========================================================================
   Standard Frosted Sections (Advantages, FAQ, Knowledge Base, Reviews)
   ========================================================================== */
.content-section {
  padding: 42px 0;
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 28px;
}

.section-head h2 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  color: var(--text-strong);
  margin-bottom: 10px;
}

.section-head p {
  font-size: 0.96rem;
  color: var(--text-muted);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.adv-card {
  border-radius: 22px;
  padding: 26px 22px;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.adv-card:hover {
  border-color: rgba(14, 165, 233, 0.55);
  transform: translateY(-2px);
}

.adv-icon {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--glass-border);
  display: grid;
  place-items: center;
  color: var(--accent-ice);
  margin-bottom: 14px;
}

.adv-card h3 {
  font-size: 1.06rem;
  color: var(--text-strong);
  margin-bottom: 8px;
}

.adv-card p {
  font-size: 0.89rem;
  color: var(--text-muted);
}

/* --- FAQ Accordion --- */
.faq-list {
  display: grid;
  gap: 12px;
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  border-radius: 18px;
  overflow: hidden;
  transition: border-color 0.25s ease;
}

.faq-item.open {
  border-color: rgba(14, 165, 233, 0.55);
}

.faq-question {
  width: 100%;
  padding: 18px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  text-align: left;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text-strong);
}

.faq-chevron {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  transition: transform 0.25s ease;
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 22px;
  font-size: 0.92rem;
  color: var(--text-main);
}

.faq-item.open .faq-answer {
  max-height: 260px;
  padding: 0 22px 18px;
}

/* --- Knowledge Base Grid --- */
.kb-filter-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-bottom: 24px;
}

.kb-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.kb-card {
  border-radius: 22px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 14px;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.kb-card:hover {
  border-color: rgba(14, 165, 233, 0.65);
  transform: translateY(-2px);
}

.kb-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.kb-cat {
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--glass-border);
  color: var(--accent-ice);
  font-weight: 600;
}

.kb-card h3 {
  font-size: 1.08rem;
  color: var(--text-strong);
  line-height: 1.4;
}

.kb-card p {
  font-size: 0.89rem;
  color: var(--text-muted);
}

.kb-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.kb-kw {
  font-size: 0.76rem;
  padding: 2px 9px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.56);
  border: 1px solid var(--glass-border-subtle);
  color: var(--text-main);
}

.kb-read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-ice);
}

/* --- Reviews Grid --- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.review-card {
  border-radius: 22px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
}

.review-stars {
  color: #0284C7;
  font-size: 0.9rem;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.92rem;
  color: var(--text-main);
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(148, 163, 184, 0.2);
}

.avatar-glass {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--glass-border);
  display: grid;
  place-items: center;
  font-weight: 700;
  color: var(--accent-ice);
  font-size: 0.88rem;
}

.review-author strong {
  display: block;
  font-size: 0.9rem;
  color: var(--text-strong);
}

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

/* ==========================================================================
   Article Pages (Knowledge Base Standalone Pages)
   ========================================================================== */
.article-wrap {
  padding: 26px 0 60px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.breadcrumb a:hover {
  color: var(--accent-ice);
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 24px;
  align-items: start;
}

.article-panel {
  border-radius: var(--radius-layer);
  padding: 36px 38px;
}

.article-header {
  padding-bottom: 22px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.24);
  margin-bottom: 24px;
}

.article-header h1 {
  font-size: clamp(1.55rem, 2.7vw, 2.15rem);
  color: var(--text-strong);
  line-height: 1.32;
  margin: 12px 0;
}

.article-submeta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.84rem;
  color: var(--text-muted);
}

.article-body h2 {
  font-size: 1.24rem;
  color: var(--text-strong);
  margin: 26px 0 12px;
}

.article-body h3 {
  font-size: 1.05rem;
  color: var(--text-strong);
  margin: 18px 0 8px;
}

.article-body p {
  margin-bottom: 14px;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--text-main);
}

.article-body ul,
.article-body ol {
  margin: 10px 0 16px 22px;
  display: grid;
  gap: 8px;
  font-size: 0.95rem;
}

.article-callout {
  margin: 22px 0;
  padding: 18px 20px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(14, 165, 233, 0.35);
}

.article-sidebar {
  position: sticky;
  top: 92px;
  display: grid;
  gap: 18px;
}

.sidebar-card {
  border-radius: 22px;
  padding: 22px;
}

.sidebar-card h3 {
  font-size: 1rem;
  color: var(--text-strong);
  margin-bottom: 12px;
}

.sidebar-links {
  list-style: none;
  display: grid;
  gap: 9px;
  font-size: 0.87rem;
}

.sidebar-links a {
  display: block;
  padding: 8px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.54);
  border: 1px solid var(--glass-border-subtle);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.sidebar-links a:hover {
  border-color: rgba(14, 165, 233, 0.6);
  color: var(--accent-ice);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  padding: 26px 0 46px;
}

.footer-panel {
  border-radius: var(--radius-layer);
  padding: 28px 32px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--accent-ice);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 980px) {
  .nav-links {
    display: none;
  }
  .mobile-menu-btn {
    display: inline-flex;
  }
  .hero-highlights {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .layer-card {
    position: relative;
    top: 0;
    padding: 26px 20px;
  }
  .telemetry-grid,
  .drawer-body,
  .article-layout {
    grid-template-columns: 1fr;
  }
  .pricing-capsules,
  .advantages-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .device-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .hero-highlights,
  .node-list,
  .device-grid,
  .kb-grid {
    grid-template-columns: 1fr;
  }
  .article-panel {
    padding: 24px 20px;
  }
  .nav-cta {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .bg-orb,
  .status-dot {
    animation: none;
  }
  html {
    scroll-behavior: auto;
  }
}