/* ===================================================================
   SIP Intercom Hub - Modern Enterprise Web Platform Stylesheet
   Inspired by Linphone & Modern WebRTC Communication Platforms
   =================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
  /* Color Palette - Dark Theme (Default) */
  --bg-primary: #0a0e17;
  --bg-secondary: #0f172a;
  --bg-tertiary: #1e293b;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --bg-glass: rgba(15, 23, 42, 0.65);
  --bg-elevated: #162032;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(0, 242, 254, 0.4);
  --border-strong: rgba(255, 255, 255, 0.16);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  --accent-cyan: #00f2fe;
  --accent-blue: #3b82f6;
  --accent-indigo: #6366f1;
  --accent-purple: #8b5cf6;
  --accent-emerald: #10b981;
  --accent-ruby: #ef4444;
  --accent-amber: #f59e0b;

  --gradient-brand: linear-gradient(135deg, #00f2fe 0%, #4facfe 50%, #6366f1 100%);
  --gradient-glow: linear-gradient(135deg, rgba(0, 242, 254, 0.25) 0%, rgba(99, 102, 241, 0.25) 100%);
  --gradient-card: linear-gradient(180deg, rgba(30, 41, 59, 0.6) 0%, rgba(15, 23, 42, 0.8) 100%);
  --gradient-accent: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 35px rgba(0, 242, 254, 0.2);
  --shadow-glow-emerald: 0 0 35px rgba(16, 185, 129, 0.25);

  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);

  --container-max-width: 1280px;
  --header-height: 76px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(0, 242, 254, 0.06) 0%, transparent 40%),
    radial-gradient(circle at 85% 65%, rgba(99, 102, 241, 0.06) 0%, transparent 45%);
  background-attachment: fixed;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

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

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

code, pre {
  font-family: var(--font-mono);
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
  position: relative;
}

.section-title-wrap {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 56px;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.25);
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.badge-pill.emerald {
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.25);
  color: var(--accent-emerald);
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 26px;
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #0b0f19;
  box-shadow: 0 4px 18px rgba(0, 242, 254, 0.35);
  font-weight: 700;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(0, 242, 254, 0.45);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  background: var(--bg-elevated);
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.btn-emerald {
  background: var(--accent-emerald);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.3);
}

.btn-emerald:hover {
  background: #059669;
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(16, 185, 129, 0.4);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

/* Navigation Header */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  min-height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  display: flex;
  align-items: center;
  padding: 8px 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 16px;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-logo-img {
  height: 40px;
  width: auto;
  border-radius: 8px;
}

.brand-title-box {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.version-pill {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 12px;
  background: rgba(0, 242, 254, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 242, 254, 0.3);
  font-family: var(--font-mono);
}

.brand-tagline {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-item a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 0;
  position: relative;
}

.nav-item a:hover,
.nav-item a.active {
  color: var(--text-primary);
}

.nav-item a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--gradient-brand);
  transition: width var(--transition-fast);
}

.nav-item a:hover::after,
.nav-item a.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.theme-toggle-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  color: var(--accent-cyan);
  border-color: var(--border-focus);
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero-section {
  padding: 80px 0 100px;
  overflow: hidden;
  position: relative;
}

.hero-glow-bg {
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.12) 0%, rgba(99, 102, 241, 0.08) 50%, transparent 70%);
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 940px;
  margin: 0 auto;
}

.hero-headline {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -0.03em;
}

.hero-subhead {
  font-size: 1.25rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.hero-stats-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  margin-bottom: 56px;
  flex-wrap: wrap;
}

.hero-stat-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.hero-stat-item svg {
  color: var(--accent-emerald);
}

/* Hero Mockup Preview */
.hero-mockup-wrap {
  position: relative;
  max-width: 1080px;
  margin: 0 auto;
  border-radius: var(--radius-xl);
  padding: 12px;
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.25) 0%, rgba(255, 255, 255, 0.05) 50%, rgba(99, 102, 241, 0.25) 100%);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.mockup-inner {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  position: relative;
}

.mockup-img {
  width: 100%;
  height: auto;
  display: block;
}

.mockup-floating-badge {
  position: absolute;
  background: rgba(15, 23, 42, 0.88);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 14px;
}

.badge-top-right {
  top: 24px;
  right: 24px;
}

.badge-bottom-left {
  bottom: 24px;
  left: 24px;
}

.pulse-circle {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 12px var(--accent-emerald);
  animation: pulseGreen 1.8s infinite;
}

@keyframes pulseGreen {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* Hardware Ecosystem Strip */
.ecosystem-strip {
  padding: 40px 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(15, 23, 42, 0.4);
}

.ecosystem-title {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  margin-bottom: 24px;
}

.brands-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.brand-logo-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.brand-logo-pill:hover {
  border-color: var(--accent-cyan);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* Interactive Simulator Section */
.simulator-section {
  background: radial-gradient(circle at 50% 30%, rgba(15, 23, 42, 0.8) 0%, var(--bg-primary) 100%);
  position: relative;
}

.sim-container {
  display: grid;
  grid-template-columns: 320px 1fr 340px;
  gap: 24px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--shadow-lg);
}

/* Simulator: Left Directory */
.sim-col-dir {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.sim-dir-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.sim-dir-title {
  font-size: 1.05rem;
  font-weight: 700;
}

.sim-intercom-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
  max-height: 480px;
}

.sim-device-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sim-device-item:hover,
.sim-device-item.active {
  background: rgba(0, 242, 254, 0.12);
  border-color: var(--accent-cyan);
}

.sim-device-info {
  display: flex;
  flex-direction: column;
}

.sim-device-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.sim-device-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Simulator: Center Live Call Console */
.sim-col-viewport {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.sim-screen-card {
  position: relative;
  background: #020617;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sim-video-canvas {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.sim-video-overlay {
  position: absolute;
  top: 16px;
  left: 16px;
  right: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
}

.sim-status-chip {
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  padding: 5px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.sim-codec-chip {
  background: rgba(16, 185, 129, 0.2);
  color: var(--accent-emerald);
  padding: 4px 10px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.sim-watermark {
  position: absolute;
  bottom: 16px;
  left: 16px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: rgba(255, 255, 255, 0.6);
  background: rgba(0, 0, 0, 0.5);
  padding: 4px 8px;
  border-radius: 4px;
}

.sim-controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 14px 20px;
}

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

.sim-btn-round {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.sim-btn-round:hover {
  transform: scale(1.08);
}

.sim-btn-call {
  background: var(--accent-emerald);
  color: #fff;
}

.sim-btn-hangup {
  background: var(--accent-ruby);
  color: #fff;
}

.sim-spectrum-box {
  flex: 1;
  margin: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sim-spectrum-bars {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 28px;
}

.spectrum-bar {
  flex: 1;
  background: var(--accent-cyan);
  border-radius: 2px;
  height: 20%;
  transition: height 0.08s ease;
}

/* Simulator: Right Door Release & Telemetry */
.sim-col-telemetry {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.sim-door-panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.door-release-btn {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  border: 2px solid var(--border-focus);
  background: radial-gradient(circle, rgba(0, 242, 254, 0.15) 0%, rgba(15, 23, 42, 0.9) 70%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  color: #fff;
  transition: all var(--transition-normal);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  position: relative;
  outline: none;
}

.door-release-btn:hover {
  transform: scale(1.04);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 35px rgba(0, 242, 254, 0.35);
}

.door-release-btn.unlocked {
  border-color: var(--accent-emerald);
  background: radial-gradient(circle, rgba(16, 185, 129, 0.35) 0%, rgba(15, 23, 42, 0.9) 70%);
  box-shadow: var(--shadow-glow-emerald);
  animation: pulseGreen 1s infinite;
}

.door-label {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.door-status-text {
  margin-top: 14px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.door-status-text.granted {
  color: var(--accent-emerald);
  font-weight: 700;
}

.sim-stats-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 18px;
}

.sim-stat-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  font-size: 0.85rem;
}

.sim-stat-row:last-child {
  border-bottom: none;
}

.sim-stat-label {
  color: var(--text-muted);
}

.sim-stat-value {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-primary);
}

/* Architecture & Modular Ecosystem (Linphone Inspired) */
.product-suite-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 64px;
}

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px 30px;
  transition: all var(--transition-normal);
  position: relative;
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.product-card-icon {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: var(--gradient-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  margin-bottom: 24px;
  border: 1px solid var(--border-subtle);
}

.product-card-title {
  font-size: 1.4rem;
  margin-bottom: 12px;
}

.product-card-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 24px;
  flex-grow: 1;
}

.product-specs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.product-spec-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.product-spec-item svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

/* Architecture Deep Dive */
.arch-diagram-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  display: grid;
  grid-template-columns: 1.2fr 1fr;
}

.arch-img-pane {
  background: #020617;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-right: 1px solid var(--border-subtle);
}

.arch-content-pane {
  padding: 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.arch-points-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 28px;
}

.arch-point-item {
  display: flex;
  gap: 16px;
}

.arch-point-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(0, 242, 254, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  flex-shrink: 0;
  border: 1px solid rgba(0, 242, 254, 0.2);
}

.arch-point-text h4 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.arch-point-text p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 28px;
}

.feature-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px;
  transition: all var(--transition-fast);
}

.feature-box:hover {
  border-color: var(--border-strong);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.feature-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(59, 130, 246, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-blue);
  margin-bottom: 20px;
}

.feature-box h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.feature-box p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.65;
}

/* Quick Start & Installation Tabs */
.quickstart-wrapper {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.tabs-nav {
  display: flex;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-subtle);
  overflow-x: auto;
}

.tab-btn {
  padding: 16px 24px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.02);
}

.tab-btn.active {
  color: var(--accent-cyan);
  border-bottom-color: var(--accent-cyan);
  background: rgba(0, 242, 254, 0.04);
}

.tab-content-panel {
  padding: 36px;
  display: none;
}

.tab-content-panel.active {
  display: block;
}

.code-snippet-box {
  background: #060911;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 16px 0;
  position: relative;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.copy-btn {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

.code-snippet-box pre {
  padding: 20px;
  overflow-x: auto;
  font-size: 0.9rem;
  color: #e2e8f0;
  line-height: 1.6;
}

/* Comparison Table */
.comparison-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.comparison-table th,
.comparison-table td {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.comparison-table th {
  background: var(--bg-elevated);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
}

.comparison-table th.highlight-col,
.comparison-table td.highlight-col {
  background: rgba(0, 242, 254, 0.05);
  border-left: 1px solid rgba(0, 242, 254, 0.2);
  border-right: 1px solid rgba(0, 242, 254, 0.2);
}

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

.check-icon {
  color: var(--accent-emerald);
  font-weight: bold;
}

.cross-icon {
  color: var(--text-muted);
}

/* Downloads Section */
.download-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.download-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  position: relative;
}

.download-card.featured {
  border-color: var(--accent-cyan);
  background: linear-gradient(180deg, rgba(0, 242, 254, 0.08) 0%, rgba(15, 23, 42, 0.8) 100%);
  box-shadow: var(--shadow-glow);
}

.card-ribbon {
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 4px 12px;
  background: var(--gradient-brand);
  color: #0b0f19;
  font-weight: 700;
  font-size: 0.72rem;
  text-transform: uppercase;
  border-radius: var(--radius-full);
}

.download-card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  margin-bottom: 20px;
}

.download-card-title {
  font-size: 1.35rem;
  margin-bottom: 8px;
}

.download-meta-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 16px;
}

.download-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 28px;
  flex-grow: 1;
}

.download-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* FAQ Accordion */
.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

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

.faq-question {
  width: 100%;
  padding: 22px 24px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-toggle-icon {
  transition: transform var(--transition-fast);
  color: var(--accent-cyan);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  max-height: 400px;
  padding: 0 24px 22px;
}

/* Footer (Linphone inspired) */
.site-footer {
  background: #050811;
  border-top: 1px solid var(--border-subtle);
  padding: 80px 0 32px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 64px;
}

.footer-brand-col p {
  margin-top: 16px;
  line-height: 1.7;
  max-width: 340px;
}

.footer-col h5 {
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 20px;
  font-weight: 600;
}

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

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

.footer-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 32px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Toast Notification */
.toast-notice {
  position: fixed;
  bottom: 28px;
  right: 28px;
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--accent-cyan);
  padding: 14px 22px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 2000;
  transform: translateY(100px);
  opacity: 0;
  transition: all var(--transition-normal);
  font-weight: 500;
}

.toast-notice.show {
  transform: translateY(0);
  opacity: 1;
}

/* ===================================================================
   Hardware Integrations Showcase & Manufacturer Gallery
   =================================================================== */
/* Manufacturer Directory Cards Grid */
.hw-catalog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.hw-catalog-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.hw-catalog-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.hw-catalog-thumb {
  height: 200px;
  background: #060911;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
}

.hw-catalog-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.hw-catalog-card:hover .hw-catalog-thumb img {
  transform: scale(1.04);
}

.hw-catalog-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.hw-catalog-badge.featured {
  background: rgba(16, 185, 129, 0.2);
  border-color: var(--accent-emerald);
  color: #34d399;
}

.hw-catalog-body {
  padding: 22px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.hw-catalog-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.hw-catalog-models {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-cyan);
  margin-bottom: 12px;
}

.hw-catalog-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
}

.hw-model-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.hw-model-pill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .hero-headline {
    font-size: 2.75rem;
  }
  .sim-container {
    grid-template-columns: 1fr;
  }
  .arch-diagram-card {
    grid-template-columns: 1fr;
  }
  .arch-img-pane {
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
  .safr-models-grid,
  .hw-catalog-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .safr-flagship-card {
    padding: 24px 18px;
  }
  .safr-models-grid,
  .safr-scenes-strip,
  .hw-catalog-grid {
    grid-template-columns: 1fr;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-lg);
  }
  .nav-links.mobile-open {
    display: flex;
  }
  .header-cta {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-headline {
    font-size: 2.2rem;
  }
  .faq-grid {
    grid-template-columns: 1fr;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom-bar {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}