/* ==========================================================================
   Gatern - Spatial Glass OS Theme
   Visual Direction: Spatial Computing + Glass OS + Floating Layers
   ========================================================================== */

:root {
  /* Color System */
  --bg-main: #F2F5F8;
  --bg-secondary: #EDF1F5;
  --bg-card: rgba(255, 255, 255, 0.58);
  --bg-card-hover: rgba(255, 255, 255, 0.75);
  --bg-card-solid: #FFFFFF;
  --bg-glass-pill: rgba(255, 255, 255, 0.65);
  
  --text-primary: #12161C;
  --text-body: #414854;
  --text-secondary: #747C88;
  --text-muted: #9BA3AF;
  
  --border-light: rgba(255, 255, 255, 0.75);
  --border-glass: rgba(150, 160, 175, 0.22);
  --border-accent: rgba(79, 124, 255, 0.35);

  --accent-blue: #4F7CFF;
  --accent-blue-hover: #3A68EE;
  --accent-blue-light: rgba(79, 124, 255, 0.1);
  --accent-cyan: #66C8C1;
  --accent-cyan-light: rgba(102, 200, 193, 0.12);
  --accent-purple: #9387FF;
  --accent-purple-light: rgba(147, 135, 255, 0.1);

  --shadow-sm: 0 4px 16px rgba(18, 22, 28, 0.04);
  --shadow-md: 0 8px 32px rgba(18, 22, 28, 0.06);
  --shadow-lg: 0 16px 48px rgba(18, 22, 28, 0.08);
  --shadow-glass: 0 12px 40px rgba(31, 38, 135, 0.06), inset 0 1px 0 rgba(255, 255, 255, 0.8);

  --blur-desktop: blur(18px);
  --blur-mobile: blur(10px);
  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 26px;
  --radius-full: 9999px;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --max-width: 1240px;
}

/* Base Reset & Typography */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-body);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* Background Soft Spatial Environment */
.spatial-bg-environment {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.spatial-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.6;
}

.orb-1 {
  top: -10%;
  left: 20%;
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(79, 124, 255, 0.15) 0%, rgba(255,255,255,0) 70%);
  animation: orbFloat 25s ease-in-out infinite alternate;
}

.orb-2 {
  top: 35%;
  right: -5%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(102, 200, 193, 0.15) 0%, rgba(255,255,255,0) 70%);
  animation: orbFloat 30s ease-in-out infinite alternate-reverse;
}

.orb-3 {
  bottom: 10%;
  left: -5%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(147, 135, 255, 0.12) 0%, rgba(255,255,255,0) 70%);
  animation: orbFloat 22s ease-in-out infinite alternate;
}

.spatial-grid-overlay {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(150, 160, 175, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(150, 160, 175, 0.05) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0) 80%);
}

@keyframes orbFloat {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -40px) scale(1.08); }
  100% { transform: translate(-20px, 20px) scale(0.95); }
}

/* Layout Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Reusable Glass Panel */
.glass-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-glass);
  backdrop-filter: var(--blur-desktop);
  -webkit-backdrop-filter: var(--blur-desktop);
  border-radius: var(--radius-lg);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.glass-panel-hover:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.9);
  transform: translateY(-4px);
  box-shadow: 0 18px 48px rgba(31, 38, 135, 0.09), inset 0 1px 0 #ffffff;
}

/* Buttons & CTAs */
.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.cta-btn-primary {
  background: var(--accent-blue);
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 6px 20px rgba(79, 124, 255, 0.3);
}

.cta-btn-primary:hover {
  background: var(--accent-blue-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(79, 124, 255, 0.4);
  color: #FFFFFF;
}

.cta-btn-secondary {
  background: rgba(255, 255, 255, 0.7);
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
  backdrop-filter: var(--blur-desktop);
}

.cta-btn-secondary:hover {
  background: #FFFFFF;
  border-color: rgba(79, 124, 255, 0.4);
  color: var(--accent-blue);
  transform: translateY(-2px);
}

.cta-btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
}

/* Floating Navigation Header */
.floating-header-wrapper {
  position: fixed;
  top: 20px;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  justify-content: center;
  padding: 0 20px;
}

.floating-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1140px;
  height: 64px;
  padding: 0 16px 0 24px;
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--border-light);
  box-shadow: 0 10px 30px rgba(31, 38, 135, 0.06), inset 0 1px 0 rgba(255, 255, 255, 0.9);
  backdrop-filter: var(--blur-desktop);
  -webkit-backdrop-filter: var(--blur-desktop);
  border-radius: var(--radius-full);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.brand-tag {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--accent-blue);
  background: var(--accent-blue-light);
  padding: 3px 8px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  border: 1px solid rgba(79, 124, 255, 0.2);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  color: var(--text-body);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--accent-blue);
}

.nav-toggle-btn {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
}

/* Spatial Hero Section */
.hero-section {
  padding-top: 150px;
  padding-bottom: 90px;
  position: relative;
}

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

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  align-self: flex-start;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  backdrop-filter: var(--blur-desktop);
}

.hero-tag-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

.hero-title-group {
  display: flex;
  flex-direction: column;
}

.hero-brand-name {
  font-size: clamp(3.5rem, 7vw, 6.5rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -2px;
  background: linear-gradient(135deg, #12161C 0%, #414854 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
  margin-top: 6px;
  letter-spacing: -0.8px;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-body);
  max-width: 520px;
  line-height: 1.65;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 8px;
}

/* Spatial Core & Floating Panels */
.hero-visual {
  position: relative;
  height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.spatial-core-wrapper {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.spatial-core-center {
  position: relative;
  width: 190px;
  height: 190px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--border-light);
  box-shadow: 0 16px 40px rgba(79, 124, 255, 0.12), inset 0 2px 4px #ffffff;
  backdrop-filter: var(--blur-desktop);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 5;
  text-align: center;
}

.core-ring {
  position: absolute;
  inset: -15px;
  border-radius: 50%;
  border: 1px solid rgba(79, 124, 255, 0.25);
  border-top-color: var(--accent-blue);
  animation: rotateRing 15s linear infinite;
}

.core-ring-outer {
  position: absolute;
  inset: -35px;
  border-radius: 50%;
  border: 1px dashed rgba(102, 200, 193, 0.3);
  animation: rotateRing 25s linear infinite reverse;
}

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

.core-brand {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: 1px;
}

.core-status {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-cyan);
  background: var(--accent-cyan-light);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  margin-top: 6px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.core-status-pulse {
  width: 6px;
  height: 6px;
  background: var(--accent-cyan);
  border-radius: 50%;
  animation: pulse 1.8s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(102, 200, 193, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(102, 200, 193, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(102, 200, 193, 0); }
}

/* Floating Widgets around Core */
.floating-panel {
  position: absolute;
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--border-light);
  box-shadow: 0 8px 24px rgba(31, 38, 135, 0.06);
  backdrop-filter: var(--blur-desktop);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 10;
  transition: transform 0.3s ease;
}

.fp-1 {
  top: 15px;
  left: 20px;
  animation: floatWidget1 6s ease-in-out infinite alternate;
}

.fp-2 {
  top: 40px;
  right: 15px;
  animation: floatWidget2 7s ease-in-out infinite alternate;
}

.fp-3 {
  bottom: 50px;
  left: 10px;
  animation: floatWidget3 6.5s ease-in-out infinite alternate;
}

.fp-4 {
  bottom: 25px;
  right: 30px;
  animation: floatWidget4 7.5s ease-in-out infinite alternate;
}

.fp-5 {
  top: 50%;
  left: -20px;
  transform: translateY(-50%);
  animation: floatWidget5 8s ease-in-out infinite alternate;
}

@keyframes floatWidget1 { 0% { transform: translateY(0); } 100% { transform: translateY(-10px); } }
@keyframes floatWidget2 { 0% { transform: translateY(0); } 100% { transform: translateY(12px); } }
@keyframes floatWidget3 { 0% { transform: translateY(0); } 100% { transform: translateY(-8px); } }
@keyframes floatWidget4 { 0% { transform: translateY(0); } 100% { transform: translateY(10px); } }
@keyframes floatWidget5 { 0% { transform: translateY(-50%) translateX(0); } 100% { transform: translateY(-50%) translateX(-8px); } }

.fp-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.fp-icon-blue { background: var(--accent-blue-light); color: var(--accent-blue); }
.fp-icon-cyan { background: var(--accent-cyan-light); color: var(--accent-cyan); }
.fp-icon-purple { background: var(--accent-purple-light); color: var(--accent-purple); }

.fp-text {
  display: flex;
  flex-direction: column;
}

.fp-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.fp-value {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-primary);
}

/* Section Shared Typography */
.section {
  padding: 80px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 50px auto;
}

.section-subtitle {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-blue);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  background: var(--accent-blue-light);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
  border: 1px solid rgba(79, 124, 255, 0.2);
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-body);
  margin-top: 12px;
}

/* Product Overview (Gatern OS Window) */
.os-window-panel {
  padding: 36px;
}

.os-window-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-glass);
  margin-bottom: 30px;
}

.os-dots {
  display: flex;
  align-items: center;
  gap: 8px;
}

.os-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.os-dot-red { background: #FF5F56; }
.os-dot-yellow { background: #FFBD2E; }
.os-dot-green { background: #27C93F; }

.os-window-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: 1px;
}

.os-stack-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.os-module-card {
  padding: 24px;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: all 0.3s ease;
}

.os-module-card:hover {
  background: rgba(255, 255, 255, 0.8);
  transform: translateY(-4px);
  border-color: rgba(79, 124, 255, 0.3);
}

.module-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--accent-blue-light);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.module-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.module-desc {
  font-size: 0.88rem;
  color: var(--text-body);
  line-height: 1.55;
}

/* Global Nodes (Floating Region Selector) */
.region-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.region-tab {
  padding: 10px 24px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.25s ease;
  backdrop-filter: var(--blur-desktop);
}

.region-tab:hover, .region-tab.active {
  background: #FFFFFF;
  color: var(--accent-blue);
  border-color: rgba(79, 124, 255, 0.4);
  box-shadow: 0 4px 16px rgba(79, 124, 255, 0.12);
}

.nodes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.node-card {
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.node-info {
  display: flex;
  align-items: center;
  gap: 14px;
}

.node-flag-code {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(79, 124, 255, 0.08);
  color: var(--accent-blue);
  font-weight: 800;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(79, 124, 255, 0.15);
}

.node-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.node-ping {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.node-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

/* Device Support Pane */
.devices-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.device-pane {
  padding: 30px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.device-svg-icon {
  width: 60px;
  height: 60px;
  color: var(--accent-blue);
  padding: 12px;
  background: var(--accent-blue-light);
  border-radius: 16px;
  border: 1px solid rgba(79, 124, 255, 0.15);
}

.device-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.device-tag {
  font-size: 0.75rem;
  color: var(--accent-cyan);
  background: var(--accent-cyan-light);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

/* AI & Streaming Spatial Service Dock */
.dock-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.dock-column {
  padding: 32px;
}

.dock-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.dock-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.dock-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
}

.dock-badge {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-blue);
  background: var(--accent-blue-light);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

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

.service-tile {
  padding: 16px;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.service-code {
  font-size: 1.1rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: 0.5px;
}

.service-label {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.service-status {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background: var(--accent-cyan-light);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

/* Spatial Plan Selector (Pricing) */
.pricing-container {
  max-width: 1000px;
  margin: 0 auto;
}

/* Desktop Plan Selector View */
.spatial-plan-selector {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 30px;
  align-items: stretch;
}

.plan-nav-tabs {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.plan-tab-btn {
  padding: 20px;
  text-align: left;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.plan-tab-btn:hover, .plan-tab-btn.active {
  background: #FFFFFF;
  border-color: rgba(79, 124, 255, 0.4);
  box-shadow: 0 8px 24px rgba(79, 124, 255, 0.1);
  transform: translateX(4px);
}

.tab-plan-name {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tab-plan-badge {
  font-size: 0.65rem;
  font-weight: 700;
  color: #FFFFFF;
  background: var(--accent-blue);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.tab-plan-price {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-blue);
}

.plan-detail-window {
  padding: 36px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.detail-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-glass);
  margin-bottom: 24px;
}

.detail-name-group {
  display: flex;
  flex-direction: column;
}

.detail-plan-code {
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--accent-blue);
  letter-spacing: 1px;
}

.detail-plan-title {
  font-size: 2rem;
  font-weight: 900;
  color: var(--text-primary);
}

.detail-price-box {
  text-align: right;
}

.detail-price {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1;
}

.detail-unit {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.detail-features {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 30px;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.98rem;
  color: var(--text-body);
}

.feature-check {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-cyan-light);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 800;
}

/* Mobile Pricing Cards (Shown on small screens) */
.mobile-pricing-grid {
  display: none;
  flex-direction: column;
  gap: 20px;
}

.mobile-plan-card {
  padding: 28px;
  position: relative;
}

.mobile-plan-card.recommended {
  border-color: rgba(79, 124, 255, 0.4);
  box-shadow: 0 12px 32px rgba(79, 124, 255, 0.15);
}

.mobile-recommended-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 0.68rem;
  font-weight: 800;
  color: #FFFFFF;
  background: var(--accent-blue);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

/* Knowledge Space (SEO Articles Grid) */
.knowledge-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 30px;
}

.featured-article-card {
  padding: 40px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 24px;
}

.article-category {
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--accent-blue);
  letter-spacing: 1px;
}

.featured-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.3;
}

.featured-desc {
  font-size: 0.98rem;
  color: var(--text-body);
  line-height: 1.6;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.article-tiles-column {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.article-mini-tile {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-decoration: none;
  color: inherit;
}

.article-mini-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: color 0.2s ease;
}

.article-mini-tile:hover .article-mini-title {
  color: var(--accent-blue);
}

/* User Feedback (Floating Feedback Windows) */
.feedback-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feedback-window {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.feedback-tag {
  align-self: flex-start;
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--accent-purple);
  background: var(--accent-purple-light);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.feedback-text {
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.65;
  font-style: italic;
}

.feedback-author {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-glass);
  padding-top: 12px;
}

/* FAQ Settings Panel */
.faq-settings-panel {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 30px;
  padding: 36px;
}

.faq-categories {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-right: 1px solid var(--border-glass);
  padding-right: 20px;
}

.faq-cat-btn {
  padding: 12px 16px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
}

.faq-cat-btn:hover, .faq-cat-btn.active {
  background: rgba(255, 255, 255, 0.7);
  color: var(--accent-blue);
}

.faq-accordion-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  border-bottom: 1px solid var(--border-glass);
  padding-bottom: 14px;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  background: transparent;
  border: none;
  text-align: left;
  cursor: pointer;
  padding: 10px 0;
}

.faq-icon {
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--text-secondary);
  transition: transform 0.25s ease;
}

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

.faq-answer {
  display: none;
  padding: 8px 0 16px 0;
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.65;
}

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

/* Spatial Footer */
.spatial-footer {
  background: #E9EEF4;
  border-top: 1px solid var(--border-glass);
  padding: 70px 0 30px 0;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--text-primary);
}

.footer-tagline {
  font-size: 0.88rem;
  color: var(--text-secondary);
  max-width: 320px;
}

.footer-col-title {
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 18px;
}

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

.footer-links a {
  color: var(--text-body);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid rgba(150, 160, 175, 0.2);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* Article Reader Base Styling */
.article-container {
  max-width: 860px;
  margin: 140px auto 80px auto;
  padding: 0 24px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.breadcrumb a {
  color: var(--text-body);
  text-decoration: none;
}

.article-header {
  margin-bottom: 40px;
}

.article-page-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 16px;
}

.article-body-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-body);
}

.article-body-content h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 40px 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-glass);
}

.article-body-content h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 28px 0 12px 0;
}

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

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

.article-body-content li {
  margin-bottom: 8px;
}

.article-cta-box {
  margin: 50px 0;
  padding: 36px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

/* Mobile Nav Menu Drawer */
.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: 90px;
  left: 20px;
  right: 20px;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(20px);
  z-index: 999;
  flex-direction: column;
  gap: 16px;
}

.mobile-nav-drawer.open {
  display: flex;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 50px;
    text-align: center;
  }
  
  .hero-content {
    align-items: center;
  }
  
  .hero-desc {
    max-width: 100%;
  }

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

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

  .dock-grid {
    grid-template-columns: 1fr;
  }

  .knowledge-grid {
    grid-template-columns: 1fr;
  }

  .spatial-plan-selector {
    display: none;
  }

  .mobile-pricing-grid {
    display: flex;
  }

  .faq-settings-panel {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .faq-categories {
    flex-direction: row;
    overflow-x: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-glass);
    padding-right: 0;
    padding-bottom: 12px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
}

@media (max-width: 768px) {
  .glass-panel {
    backdrop-filter: var(--blur-mobile);
    -webkit-backdrop-filter: var(--blur-mobile);
  }

  .floating-header-wrapper {
    top: 12px;
  }

  .floating-header {
    height: 56px;
    padding: 0 12px 0 18px;
  }

  .header-nav {
    display: none;
  }

  .nav-toggle-btn {
    display: block;
  }

  .hero-section {
    padding-top: 110px;
  }

  .hero-visual {
    height: 380px;
  }

  .floating-panel {
    padding: 8px 12px;
    font-size: 0.8rem;
  }

  .fp-icon {
    width: 28px;
    height: 28px;
    font-size: 0.8rem;
  }

  .fp-5 {
    display: none;
  }

  .os-stack-grid {
    grid-template-columns: 1fr;
  }

  .feedback-grid {
    grid-template-columns: 1fr;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-brand-name {
    font-size: 3.2rem;
  }

  .hero-subtitle {
    font-size: 1.5rem;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }

  .cta-btn {
    width: 100%;
  }

  .devices-grid {
    grid-template-columns: 1fr;
  }

  .spatial-core-center {
    width: 140px;
    height: 140px;
  }

  .core-ring { inset: -10px; }
  .core-ring-outer { inset: -20px; }

  .fp-1 { top: 5px; left: 0; }
  .fp-2 { top: 20px; right: 0; }
  .fp-3 { bottom: 20px; left: 0; }
  .fp-4 { bottom: 5px; right: 0; }
}