/* ==========================================================================
   Eun AI Agent Hub - Modern Calm Design System & Theme Engine
   ========================================================================== */

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

:root {
  /* Color Palette - Dark Mode (Default) */
  --bg-primary: #090d16;
  --bg-secondary: #0f1524;
  --bg-tertiary: #162035;
  --bg-card: rgba(15, 22, 38, 0.72);
  --bg-card-hover: rgba(22, 32, 54, 0.85);
  --bg-glass: rgba(15, 23, 42, 0.65);
  --bg-pill: rgba(255, 255, 255, 0.05);

  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-focus: rgba(99, 102, 241, 0.5);
  --border-card: rgba(255, 255, 255, 0.09);
  --border-card-hover: rgba(99, 102, 241, 0.35);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #090d16;

  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-primary-glow: rgba(99, 102, 241, 0.25);
  --accent-secondary: #10b981;
  --accent-secondary-glow: rgba(16, 185, 129, 0.2);
  --accent-amber: #f59e0b;
  --accent-cyan: #06b6d4;
  --accent-purple: #a855f7;

  --badge-bg-active: rgba(16, 185, 129, 0.12);
  --badge-text-active: #34d399;
  --badge-border-active: rgba(16, 185, 129, 0.3);

  --badge-bg-beta: rgba(99, 102, 241, 0.12);
  --badge-text-beta: #818cf8;
  --badge-border-beta: rgba(99, 102, 241, 0.3);

  --badge-bg-upcoming: rgba(245, 158, 11, 0.12);
  --badge-text-upcoming: #fbbf24;
  --badge-border-upcoming: rgba(245, 158, 11, 0.3);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 24px -4px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 36px -6px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.15);

  --canvas-node-color: rgba(148, 163, 184, 0.7);
  --canvas-line-color: rgba(99, 102, 241, 0.18);
  --canvas-active-line: rgba(99, 102, 241, 0.6);

  --font-sans: 'Pretendard', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --transition-fast: 0.18s ease;
  --transition-normal: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.45s cubic-bezier(0.16, 1, 0.3, 1);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-tertiary: #e2e8f0;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-glass: rgba(255, 255, 255, 0.78);
  --bg-pill: rgba(0, 0, 0, 0.04);

  --border-subtle: rgba(0, 0, 0, 0.07);
  --border-focus: rgba(79, 70, 229, 0.5);
  --border-card: rgba(0, 0, 0, 0.08);
  --border-card-hover: rgba(79, 70, 229, 0.3);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --accent-primary: #4f46e5;
  --accent-primary-hover: #4338ca;
  --accent-primary-glow: rgba(79, 70, 229, 0.15);
  --accent-secondary: #059669;
  --accent-secondary-glow: rgba(5, 150, 105, 0.15);

  --badge-bg-active: rgba(16, 185, 129, 0.1);
  --badge-text-active: #047857;
  --badge-border-active: rgba(16, 185, 129, 0.25);

  --badge-bg-beta: rgba(79, 70, 229, 0.08);
  --badge-text-beta: #4338ca;
  --badge-border-beta: rgba(79, 70, 229, 0.25);

  --badge-bg-upcoming: rgba(217, 119, 6, 0.1);
  --badge-text-upcoming: #b45309;
  --badge-border-upcoming: rgba(217, 119, 6, 0.25);

  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 20px -3px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 16px 32px -4px rgba(0, 0, 0, 0.09);
  --shadow-glow: 0 0 24px rgba(79, 70, 229, 0.1);

  --canvas-node-color: rgba(71, 85, 105, 0.6);
  --canvas-line-color: rgba(79, 70, 229, 0.12);
  --canvas-active-line: rgba(79, 70, 229, 0.5);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  position: relative;
}

/* Background Ambient Lighting */
.ambient-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.35;
  transition: opacity var(--transition-slow);
}

[data-theme="light"] .glow-orb {
  opacity: 0.18;
}

.glow-1 {
  top: -10%;
  left: 20%;
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.4) 0%, rgba(99, 102, 241, 0) 70%);
}

.glow-2 {
  top: 30%;
  right: -5%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.25) 0%, rgba(16, 185, 129, 0) 70%);
}

.glow-3 {
  bottom: 5%;
  left: 10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.22) 0%, rgba(168, 85, 247, 0) 70%);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: var(--bg-glass);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-normal);
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-icon-box {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent-primary), #818cf8);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: var(--shadow-glow);
  transition: transform var(--transition-fast);
}

.brand-wrapper:hover .brand-icon-box {
  transform: rotate(6deg) scale(1.05);
}

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

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.brand-badge {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-full);
  background: var(--accent-primary-glow);
  color: var(--accent-primary);
  border: 1px solid var(--border-card-hover);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.brand-subtitle {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 400;
}

.nav-center {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

@media (max-width: 768px) {
  .nav-center {
    display: none;
  }
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.85rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-pill);
}

.nav-link.active {
  color: var(--accent-primary);
  background: var(--accent-primary-glow);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.server-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.8rem;
  background: var(--bg-pill);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-secondary);
  position: relative;
}

.status-dot::after {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  background-color: var(--accent-secondary);
  animation: pulse-ring 1.8s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.9); opacity: 0.8; }
  70% { transform: scale(2.2); opacity: 0; }
  100% { transform: scale(2.2); opacity: 0; }
}

.theme-toggle-btn, .btn-icon {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover, .btn-icon:hover {
  color: var(--text-primary);
  border-color: var(--border-card-hover);
  background: var(--bg-card-hover);
  transform: translateY(-1px);
}

.btn-header-info {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.95rem;
  background: var(--accent-primary);
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.btn-header-info:hover {
  background: var(--accent-primary-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

/* ==========================================================================
   Hero Section with Canvas Animation
   ========================================================================== */
.hero-section {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4.5rem 1.5rem 3.5rem;
  overflow: hidden;
}

.hero-canvas-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: auto;
}

.hero-gradient-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(9, 13, 22, 0.2) 0%, var(--bg-primary) 85%);
  z-index: 2;
  pointer-events: none;
}

[data-theme="light"] .hero-gradient-overlay {
  background: radial-gradient(circle at 50% 50%, rgba(248, 250, 252, 0.2) 0%, var(--bg-primary) 85%);
}

.hero-content {
  position: relative;
  z-index: 10;
  max-width: 860px;
  text-align: center;
  margin: 0 auto;
}

.hero-badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}

.hero-badge-tag i {
  color: var(--accent-primary);
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.hero-title-gradient {
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="light"] .hero-title-gradient {
  background: linear-gradient(135deg, #0f172a 30%, #4f46e5 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: clamp(1rem, 2vw, 1.18rem);
  color: var(--text-secondary);
  line-height: 1.65;
  margin: 0 auto 2.2rem;
  max-width: 680px;
  font-weight: 400;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.6rem;
  background: var(--accent-primary);
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 4px 14px var(--accent-primary-glow);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.btn-primary:hover {
  background: var(--accent-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-primary-glow);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.6rem;
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  border: 1px solid var(--border-card);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ==========================================================================
   Section Layout & Containers
   ========================================================================== */
.main-content {
  position: relative;
  z-index: 10;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem 5rem;
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 1.8rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.section-title-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.section-title {
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.section-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition-fast);
  backdrop-filter: blur(8px);
}

.section-action-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateX(2px);
}

/* ==========================================================================
   Server Metrics Dashboard (4 Cards)
   ========================================================================== */
.server-dashboard-section {
  margin-bottom: 4.5rem;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

@media (max-width: 1024px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .metrics-grid {
    grid-template-columns: 1fr;
  }
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.4rem;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

.metric-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.metric-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-card-hover);
  box-shadow: var(--shadow-md);
}

.metric-card:hover::before {
  opacity: 1;
}

.metric-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.1rem;
}

.metric-icon-wrap {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-pill);
  border: 1px solid var(--border-subtle);
  color: var(--accent-primary);
  transition: transform var(--transition-fast);
}

.metric-card:hover .metric-icon-wrap {
  transform: scale(1.08);
}

.metric-icon-wrap.cpu { color: #6366f1; background: rgba(99, 102, 241, 0.1); }
.metric-icon-wrap.ram { color: #10b981; background: rgba(16, 185, 129, 0.1); }
.metric-icon-wrap.disk { color: #06b6d4; background: rgba(6, 182, 212, 0.1); }
.metric-icon-wrap.uptime { color: #f59e0b; background: rgba(245, 158, 11, 0.1); }

.metric-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-full);
  background: var(--bg-pill);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
}

.metric-badge.live {
  background: var(--badge-bg-active);
  color: var(--badge-text-active);
  border-color: var(--badge-border-active);
}

.metric-title {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.metric-value-row {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  margin-bottom: 0.85rem;
}

.metric-primary-val {
  font-family: var(--font-mono);
  font-size: 1.95rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1;
}

.metric-unit {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}

.metric-bar-container {
  width: 100%;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 0.85rem;
}

.metric-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.metric-bar-fill.cpu { background: linear-gradient(90deg, #6366f1, #818cf8); }
.metric-bar-fill.ram { background: linear-gradient(90deg, #10b981, #34d399); }
.metric-bar-fill.disk { background: linear-gradient(90deg, #06b6d4, #38bdf8); }
.metric-bar-fill.uptime { background: linear-gradient(90deg, #f59e0b, #fbbf24); }

.metric-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
  padding-top: 0.75rem;
}

.metric-footer-val {
  font-weight: 600;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

/* ==========================================================================
   AI Agent Features Grid
   ========================================================================== */
.features-section {
  margin-bottom: 4.5rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

@media (max-width: 1100px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
  position: relative;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-card-hover);
  box-shadow: var(--shadow-md);
}

.feature-card-top {
  margin-bottom: 1.2rem;
}

.feature-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.feature-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-pill);
  border: 1px solid var(--border-subtle);
  color: var(--accent-primary);
  transition: all var(--transition-fast);
}

.feature-card:hover .feature-icon-box {
  background: var(--accent-primary-glow);
  transform: scale(1.08);
}

.feature-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
}

.feature-badge.active {
  background: var(--badge-bg-active);
  color: var(--badge-text-active);
  border: 1px solid var(--badge-border-active);
}

.feature-badge.beta {
  background: var(--badge-bg-beta);
  color: var(--badge-text-beta);
  border: 1px solid var(--badge-border-beta);
}

.feature-badge.upcoming {
  background: var(--badge-bg-upcoming);
  color: var(--badge-text-upcoming);
  border: 1px solid var(--badge-border-upcoming);
}

.feature-title {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.45rem;
  letter-spacing: -0.01em;
}

.feature-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.feature-footer {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.feature-tags {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.feature-tag-chip {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  background: var(--bg-pill);
  color: var(--text-muted);
}

.feature-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  background: var(--bg-pill);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  transition: all var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
}

.feature-action-btn:hover {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
  transform: translateY(-1px);
}

.feature-action-btn.primary-btn {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: transparent;
}

.feature-action-btn.primary-btn:hover {
  background: var(--accent-primary-hover);
}

/* ==========================================================================
   Quick Info / Server Migration Banner
   ========================================================================== */
.migration-banner {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(16, 185, 129, 0.08));
  border: 1px solid var(--border-card-hover);
  border-radius: var(--radius-lg);
  padding: 1.8rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 4rem;
  backdrop-filter: blur(12px);
}

@media (max-width: 768px) {
  .migration-banner {
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem;
  }
}

.banner-content {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

.banner-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--accent-primary-glow);
  border: 1px solid var(--border-focus);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
  flex-shrink: 0;
}

.banner-text-group h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.banner-text-group p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.banner-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.75rem 1.4rem;
  background: var(--accent-primary);
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  box-shadow: 0 4px 14px var(--accent-primary-glow);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.banner-btn:hover {
  background: var(--accent-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--accent-primary-glow);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  padding: 3rem 1.5rem 2rem;
  color: var(--text-muted);
}

.footer-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-brand-info {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.footer-brand-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  flex-wrap: wrap;
}

.footer-link {
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-system-info {
  font-family: var(--font-mono);
  color: var(--text-muted);
}

/* ==========================================================================
   Interactive Feature Modal
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-backdrop.show {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-card-hover);
  border-radius: var(--radius-lg);
  max-width: 520px;
  width: 100%;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px) scale(0.96);
  transition: transform var(--transition-normal);
  position: relative;
}

.modal-backdrop.show .modal-card {
  transform: translateY(0) scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: var(--bg-pill);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.modal-icon-wrap {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: var(--accent-primary-glow);
  border: 1px solid var(--border-focus);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
  margin-bottom: 1.25rem;
}

.modal-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.modal-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.modal-details-box {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-bottom: 1.5rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.modal-details-row {
  display: flex;
  justify-content: space-between;
}

.modal-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
}