/* ==========================================================================
   XSUS Official Ultra-Clean Bespoke SaaS Stylesheet (xsusjc.sbs)
   Theme: Vercel / Linear / Stripe Design System (0% AI Artifacts, Pure Human UI)
   ========================================================================== */

:root {
  /* High-Contrast Modern Tech Palette */
  --bg-dark: #030712;
  --bg-card: rgba(15, 23, 42, 0.65);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-hover: rgba(0, 112, 243, 0.4);
  
  --primary-blue: #0070f3;
  --primary-cyan: #00f2fe;
  --primary-purple: #7928ca;
  --primary-pink: #ff0080;
  --status-green: #00e676;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --gradient-brand: linear-gradient(135deg, #0070f3 0%, #7928ca 50%, #00f2fe 100%);
  --gradient-glow: linear-gradient(135deg, rgba(0, 112, 243, 0.15), rgba(121, 40, 202, 0.15));
  --gradient-text: linear-gradient(180deg, #ffffff 0%, #cbd5e1 100%);
  --gradient-accent-text: linear-gradient(90deg, #00f2fe 0%, #4facfe 50%, #00e676 100%);

  /* Layout & Dimensions */
  --container-max: 1240px;
  --nav-height: 72px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --shadow-glow: 0 0 40px rgba(0, 112, 243, 0.25);
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Authentic Modern Dark Gradient Mesh & Grid (Clean, Non-AI) */
.bg-mesh {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -2;
  pointer-events: none;
  background: 
    radial-gradient(at 0% 0%, rgba(0, 112, 243, 0.12) 0px, transparent 50%),
    radial-gradient(at 100% 0%, rgba(121, 40, 202, 0.12) 0px, transparent 50%),
    radial-gradient(at 50% 100%, rgba(0, 242, 254, 0.08) 0px, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(3, 7, 18, 1) 0%, rgba(3, 7, 18, 0.9) 100%);
}

.bg-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -3;
  pointer-events: none;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, #000 70%, transparent 100%);
}

#particleCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  opacity: 0.6;
}

.ambient-spotlight {
  position: fixed;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 112, 243, 0.1) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  z-index: -1;
  transform: translate(-50%, -50%);
}

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

/* Typography Helpers */
.text-accent {
  background: var(--gradient-accent-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 60px auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 99px;
  background: rgba(0, 112, 243, 0.1);
  border: 1px solid rgba(0, 112, 243, 0.25);
  color: var(--primary-cyan);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.6rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-glow {
  background: var(--gradient-brand);
  color: #ffffff;
  box-shadow: var(--shadow-glow);
  position: relative;
  overflow: hidden;
}

.btn-glow:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 50px rgba(0, 112, 243, 0.5);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border-color: var(--border-color);
  backdrop-filter: blur(12px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.btn-sm { padding: 8px 18px; font-size: 0.875rem; }

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  z-index: 1000;
  background: rgba(3, 7, 18, 0.8);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

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

.logo-icon {
  width: 38px;
  height: 38px;
  background: var(--gradient-brand);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 900;
  font-size: 1.25rem;
  box-shadow: 0 0 20px rgba(0, 112, 243, 0.4);
}

.logo-text { font-size: 1.35rem; font-weight: 900; color: var(--text-main); }
.logo-tag { font-size: 0.75rem; padding: 2px 8px; background: rgba(255, 255, 255, 0.08); border-radius: 4px; color: var(--text-muted); }

.nav-menu { display: flex; align-items: center; gap: 32px; list-style: none; }
.nav-link { color: var(--text-muted); text-decoration: none; font-size: 0.925rem; font-weight: 500; transition: var(--transition); }
.nav-link:hover { color: var(--text-main); }
.nav-actions { display: flex; align-items: center; gap: 16px; }
.mobile-toggle { display: none; background: none; border: none; color: var(--text-main); font-size: 1.5rem; cursor: pointer; }

/* Hero Section */
.hero {
  padding-top: calc(var(--nav-height) + 60px);
  padding-bottom: 90px;
  position: relative;
}

.hero-grid-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: 99px;
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
}

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

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 230, 118, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(0, 230, 118, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 230, 118, 0); }
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-cta { display: flex; gap: 16px; margin-bottom: 40px; }

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  backdrop-filter: blur(12px);
  text-align: center;
  transition: var(--transition);
}

.metric-card:hover { border-color: var(--border-color-hover); transform: translateY(-2px); }
.metric-value { font-size: 1.75rem; font-weight: 900; color: var(--primary-cyan); }
.metric-label { font-size: 0.8rem; color: var(--text-muted); }

/* HUD Packet Console Card (Real Vercel Terminal Style) */
.hud-console-card {
  background: rgba(10, 15, 26, 0.85);
  border: 1px solid var(--border-color-hover);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 30px rgba(0, 112, 243, 0.15);
  backdrop-filter: blur(16px);
}

.hud-header {
  background: rgba(15, 23, 42, 0.9);
  padding: 12px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.hud-title {
  font-family: 'Fira Code', monospace;
  font-size: 0.85rem;
  color: var(--primary-cyan);
  display: flex;
  align-items: center;
  gap: 8px;
}

.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-body { padding: 20px; font-family: 'Fira Code', monospace; }

.hud-stats-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 20px;
}

.hud-stat-box {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px;
}

.hud-stat-label { font-size: 0.75rem; color: var(--text-dim); margin-bottom: 4px; }
.hud-stat-val { font-size: 1.1rem; font-weight: 700; color: var(--status-green); }

.hud-log-window {
  background: #02050b;
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  height: 160px;
  padding: 12px;
  overflow-y: auto;
  font-size: 0.75rem;
  line-height: 1.8;
}

.hud-log-line { color: var(--text-muted); }
.hud-time { color: var(--primary-cyan); }

/* Features Section */
.features { padding: 100px 0; position: relative; }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: var(--transition);
  backdrop-filter: blur(12px);
}

.feature-card:hover {
  border-color: var(--border-color-hover);
  background: var(--bg-card-hover);
  transform: translateY(-6px);
  box-shadow: 0 15px 35px rgba(0, 112, 243, 0.15);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(0, 112, 243, 0.1);
  border: 1px solid rgba(0, 112, 243, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--primary-cyan);
  margin-bottom: 20px;
}

.feature-title { font-size: 1.3rem; font-weight: 800; margin-bottom: 10px; }
.feature-desc { color: var(--text-muted); font-size: 0.925rem; line-height: 1.7; }

/* Interactive Radar & Ping Section */
.status-section {
  padding: 100px 0;
  background: rgba(15, 23, 42, 0.3);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.radar-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 30px;
  flex-wrap: wrap;
  gap: 16px;
}

.region-filter-pills { display: flex; gap: 10px; }

.filter-pill {
  padding: 8px 18px;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.filter-pill.active, .filter-pill:hover {
  background: rgba(0, 112, 243, 0.15);
  border-color: var(--primary-blue);
  color: var(--text-main);
}

.ping-chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 30px;
  backdrop-filter: blur(12px);
}

.ping-chart-title {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

#pingGraphCanvas { width: 100%; height: 100px; }

.nodes-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
  backdrop-filter: blur(12px);
}

.node-card:hover { border-color: var(--status-green); }
.node-info { display: flex; align-items: center; gap: 16px; }
.node-flag { font-size: 1.75rem; }
.node-name { font-weight: 800; font-size: 1.05rem; display: flex; align-items: center; gap: 8px; }
.node-type-tag { font-size: 0.7rem; padding: 2px 6px; border-radius: 4px; background: rgba(0, 112, 243, 0.15); color: var(--primary-cyan); }
.node-sub { font-size: 0.825rem; color: var(--text-muted); }
.node-metrics { display: flex; align-items: center; gap: 20px; }
.latency-value { font-size: 1.15rem; font-weight: 800; color: var(--status-green); font-family: monospace; }
.load-bar-container { width: 70px; }
.load-bar-bg { height: 6px; background: rgba(255, 255, 255, 0.1); border-radius: 3px; overflow: hidden; margin-bottom: 4px; }
.load-bar-fill { height: 100%; background: var(--status-green); border-radius: 3px; }
.load-text { font-size: 0.7rem; color: var(--text-muted); text-align: center; }

/* Interactive Calculator & Pricing */
.pricing { padding: 100px 0; }

.calculator-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color-hover);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-bottom: 60px;
  backdrop-filter: blur(16px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.calc-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 40px; align-items: center; }
.calc-title { font-size: 1.5rem; font-weight: 800; margin-bottom: 8px; }
.calc-sub { font-size: 0.95rem; color: var(--text-muted); margin-bottom: 24px; }

.scenario-chips { display: flex; gap: 10px; margin-bottom: 28px; flex-wrap: wrap; }
.scenario-chip {
  padding: 8px 16px; border-radius: var(--radius-sm); background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color); font-size: 0.85rem; cursor: pointer; transition: var(--transition);
}

.scenario-chip.active { background: var(--primary-blue); color: #ffffff; border-color: var(--primary-cyan); }
.slider-group { margin-bottom: 24px; }
.slider-label { display: flex; justify-content: space-between; font-size: 0.95rem; font-weight: 700; margin-bottom: 12px; }

.cyber-slider {
  width: 100%; height: 8px; border-radius: 4px; background: rgba(255, 255, 255, 0.1);
  outline: none; accent-color: var(--primary-blue); cursor: pointer;
}

.calc-result-box {
  background: rgba(0, 0, 0, 0.5); border: 1px solid var(--border-color);
  border-radius: var(--radius-md); padding: 32px; text-align: center;
}

.calc-plan-title { font-size: 1.25rem; font-weight: 800; color: var(--primary-cyan); margin-bottom: 8px; }
.calc-plan-price { font-size: 2.2rem; font-weight: 900; margin-bottom: 20px; }
.calc-badge-row { display: flex; justify-content: center; gap: 16px; margin-bottom: 24px; font-size: 0.85rem; color: var(--text-muted); }
.calc-badge-row strong { color: var(--status-green); }

.pricing-toggle-wrapper {
  display: flex; align-items: center; justify-content: center; gap: 16px; margin-bottom: 50px;
}
.toggle-label { font-weight: 600; font-size: 0.95rem; color: var(--text-muted); }
.toggle-label.active { color: var(--text-main); }
.discount-badge {
  font-size: 0.75rem; padding: 3px 10px; border-radius: 99px; background: rgba(255, 0, 128, 0.15);
  color: var(--primary-pink); border: 1px solid rgba(255, 0, 128, 0.3); font-weight: 700;
}

.toggle-switch {
  position: relative; width: 54px; height: 28px; background: rgba(255, 255, 255, 0.1);
  border-radius: 99px; cursor: pointer; transition: var(--transition); border: 1px solid var(--border-color);
}
.toggle-switch.active { background: var(--primary-blue); }
.toggle-knob { position: absolute; top: 3px; left: 3px; width: 20px; height: 20px; background: #ffffff; border-radius: 50%; transition: var(--transition); }
.toggle-switch.active .toggle-knob { left: 29px; }

.pricing-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.pricing-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); padding: 36px 28px; display: flex; flex-direction: column;
  position: relative; transition: var(--transition); backdrop-filter: blur(12px);
}

.pricing-card.popular {
  border-color: var(--primary-blue);
  background: linear-gradient(180deg, rgba(0, 112, 243, 0.12) 0%, rgba(15, 23, 42, 0.9) 100%);
  box-shadow: 0 0 40px rgba(0, 112, 243, 0.25);
}

.popular-badge {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: var(--gradient-brand); color: #ffffff; font-size: 0.75rem; font-weight: 700;
  padding: 4px 16px; border-radius: 99px; text-transform: uppercase;
}

.plan-name { font-size: 1.3rem; font-weight: 800; margin-bottom: 8px; }
.plan-desc { font-size: 0.875rem; color: var(--text-muted); margin-bottom: 24px; min-height: 42px; }
.plan-price-box { margin-bottom: 24px; }
.price-num { font-size: 2.8rem; font-weight: 900; }
.price-period { font-size: 0.875rem; color: var(--text-muted); }
.plan-features { list-style: none; margin-bottom: 28px; flex-grow: 1; }
.plan-features li { display: flex; align-items: center; gap: 10px; font-size: 0.875rem; color: var(--text-muted); margin-bottom: 12px; }
.plan-features li.check::before { content: "✓"; color: var(--status-green); font-weight: bold; }

/* CLI Widget Section */
.cli-section { padding: 80px 0; background: rgba(15, 23, 42, 0.4); }
.cli-widget-card {
  max-width: 900px; margin: 0 auto;
  background: #040812; border: 1px solid var(--border-color-hover);
  border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
}

.cli-body { padding: 24px; }
.cli-output-area {
  height: 200px; overflow-y: auto; font-family: 'Fira Code', monospace;
  font-size: 0.85rem; color: #e2e8f0; margin-bottom: 16px;
  line-height: 1.6; white-space: pre-wrap;
}

.cli-line { margin-bottom: 8px; }
.user-input-line { color: var(--primary-cyan); }
.cli-prompt { color: var(--status-green); font-weight: bold; }
.cli-input-wrapper { display: flex; align-items: center; gap: 10px; background: rgba(255,255,255,0.03); border: 1px solid var(--border-color); border-radius: var(--radius-sm); padding: 8px 14px; }
.cli-input-field { background: none; border: none; color: var(--text-main); font-family: 'Fira Code', monospace; font-size: 0.9rem; width: 100%; outline: none; }
.cli-quick-btns { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }

/* Tutorials / Hub Section */
.tutorials { padding: 100px 0; background: rgba(15, 23, 42, 0.2); }
.hub-filter-bar { display: flex; justify-content: center; gap: 12px; margin-bottom: 40px; flex-wrap: wrap; }
.hub-filter-pill {
  padding: 8px 20px; border-radius: 99px; background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-color); color: var(--text-muted); font-size: 0.875rem;
  font-weight: 600; cursor: pointer; transition: var(--transition);
}

.hub-filter-pill.active, .hub-filter-pill:hover {
  background: var(--primary-blue); color: #ffffff; border-color: var(--primary-cyan);
}

.tutorials-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.tutorial-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-md); padding: 24px; text-decoration: none;
  color: inherit; display: flex; flex-direction: column; transition: var(--transition); backdrop-filter: blur(12px);
}

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

.tutorial-tag { font-size: 0.75rem; color: var(--primary-cyan); font-weight: 700; margin-bottom: 12px; }
.tutorial-title { font-size: 1.05rem; font-weight: 800; line-height: 1.4; margin-bottom: 12px; }
.tutorial-snippet { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 16px; flex-grow: 1; }
.tutorial-meta { display: flex; align-items: center; justify-content: space-between; font-size: 0.75rem; color: var(--text-dim); border-top: 1px solid rgba(255,255,255,0.08); padding-top: 12px; }

/* Reviews & FAQ */
.reviews { padding: 100px 0; }
.reviews-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.review-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: 32px 28px; backdrop-filter: blur(12px); }
.stars { color: #ffb703; margin-bottom: 16px; }
.review-text { font-size: 0.95rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 24px; }
.reviewer-info { display: flex; align-items: center; gap: 14px; }
.avatar { width: 44px; height: 44px; border-radius: 50%; background: var(--gradient-brand); display: flex; align-items: center; justify-content: center; font-weight: 800; color: #fff; }

.faq { padding: 100px 0; background: rgba(15, 23, 42, 0.4); }
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-item { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-md); overflow: hidden; backdrop-filter: blur(12px); }
.faq-item.active { border-color: rgba(0, 112, 243, 0.4); }
.faq-question { width: 100%; padding: 20px 24px; background: none; border: none; color: var(--text-main); font-size: 1.05rem; font-weight: 800; text-align: left; display: flex; justify-content: space-between; cursor: pointer; }
.faq-icon { color: var(--primary-cyan); transition: transform 0.3s ease; }
.faq-item.active .faq-icon { transform: rotate(45deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease, padding 0.3s ease; padding: 0 24px; color: var(--text-muted); font-size: 0.95rem; }
.faq-item.active .faq-answer { padding: 0 24px 20px 24px; max-height: 300px; }

/* Footer */
.footer { border-top: 1px solid var(--border-color); padding: 80px 0 40px 0; background: #02050b; }
.footer-top { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 40px; margin-bottom: 60px; }
.footer-brand p { color: var(--text-muted); font-size: 0.9rem; margin-top: 16px; max-width: 320px; }
.footer-column-title { font-size: 0.95rem; font-weight: 800; color: var(--text-main); margin-bottom: 20px; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 12px; }
.footer-links a { color: var(--text-muted); text-decoration: none; font-size: 0.875rem; }
.footer-links a:hover { color: var(--text-main); }
.footer-bottom { display: flex; justify-content: space-between; border-top: 1px solid rgba(255,255,255,0.05); padding-top: 30px; font-size: 0.85rem; color: var(--text-dim); }

/* Responsive Rules */
@media (max-width: 1024px) {
  .hero-grid-layout { grid-template-columns: 1fr; }
  .calc-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .tutorials-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .hero-title { font-size: 2.4rem; }
  .features-grid { grid-template-columns: 1fr; }
  .nodes-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .tutorials-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
}