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

:root {
  /* 1. PALET DEEP SAPPHIRE & MIDNIGHT NAVY */
  --bg-obsidian: #050811;          /* Deep Midnight Obsidian */
  --bg-surface: #0B1120;           /* Dark Navy Slate */
  --bg-surface-elevated: #111A2E;  /* Elevated Navy Card */
  --bg-surface-hover: #18233D;     /* Hover Surface */
  
  --border-subtle: rgba(56, 189, 248, 0.12); /* Thin Ice Blue Border */
  --border-focus: rgba(96, 165, 250, 0.5);
  --border-glow: rgba(96, 165, 250, 0.25);
  
  /* Primary Sapphire Accent (HAPUS SEMUA HIJAU) */
  --sapphire-primary: #1E40AF;      /* Deep Sapphire Blue */
  --sapphire-bright: #2563EB;       /* Vibrant Sapphire */
  --sapphire-hover: #1D4ED8;        /* Royal Blue Hover */
  --sapphire-subtle: rgba(37, 99, 235, 0.15);
  --sapphire-rim: rgba(96, 165, 250, 0.25);

  /* Secondary Accent (Sky Steel Blue) */
  --sky-accent: #38BDF8;            /* Steel Sky Blue */
  --sky-subtle: rgba(56, 189, 248, 0.14);
  
  --amber-gold: #F59E0B;            /* Amber Gold for VIP Crown */
  --amber-subtle: rgba(245, 158, 11, 0.14);

  --rose-crimson: #EF4444;
  --rose-subtle: rgba(239, 68, 68, 0.14);

  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --text-sky: #38BDF8;

  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-pill: 9999px;

  --sidebar-width: 270px;
  --topbar-height: 64px;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-obsidian);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-obsidian);
}
::-webkit-scrollbar-thumb {
  background: rgba(56, 189, 248, 0.2);
  border-radius: var(--radius-pill);
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(56, 189, 248, 0.35);
}

/* Typography Helpers */
.font-mono {
  font-family: var(--font-mono);
}
.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.font-extrabold { font-weight: 800; }

.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-sky { color: var(--sky-accent); }
.text-blue { color: var(--sapphire-bright); }
.text-amber { color: var(--amber-gold); }
.text-rose { color: var(--rose-crimson); }
/* Alias emerald to sapphire/sky to prevent any accidental green */
.text-emerald { color: var(--sky-accent) !important; }

/* SVG Icons Default */
.icon {
  width: 18px;
  height: 18px;
  stroke-width: 1.75px;
  stroke: currentColor;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  vertical-align: middle;
  flex-shrink: 0;
}
.icon-sm { width: 15px; height: 15px; }
.icon-lg { width: 22px; height: 22px; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  text-decoration: none;
  white-space: nowrap;
}
.btn:active {
  transform: scale(0.98);
}

/* Deep Sapphire Primary Button */
.btn-sapphire, .btn-emerald, .btn-primary {
  background-color: var(--sapphire-bright) !important;
  color: #FFFFFF !important;
  border: 1px solid var(--sapphire-rim) !important;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
}
.btn-sapphire:hover, .btn-emerald:hover, .btn-primary:hover {
  background-color: var(--sapphire-hover) !important;
  border-color: rgba(96, 165, 250, 0.5) !important;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
}

.btn-blue {
  background-color: var(--sapphire-primary);
  color: #FFFFFF;
  border: 1px solid rgba(56, 189, 248, 0.25);
}
.btn-blue:hover {
  background-color: var(--sapphire-bright);
}

.btn-amber {
  background-color: var(--amber-gold);
  color: #050811;
  font-weight: 700;
}
.btn-amber:hover {
  background-color: #D97706;
}

.btn-secondary {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}
.btn-secondary:hover {
  background-color: var(--bg-surface-hover);
  border-color: rgba(56, 189, 248, 0.25);
  color: #FFFFFF;
}

.btn-danger {
  background-color: var(--rose-subtle);
  color: var(--rose-crimson);
  border: 1px solid rgba(239, 68, 68, 0.3);
}
.btn-danger:hover {
  background-color: rgba(239, 68, 68, 0.2);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.775rem;
}
.btn-lg {
  padding: 13px 26px;
  font-size: 1rem;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  font-size: 0.725rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.badge-vip {
  background-color: var(--amber-subtle);
  color: var(--amber-gold);
  border: 1px solid rgba(245, 158, 11, 0.35);
}
.badge-free {
  background-color: rgba(148, 163, 184, 0.1);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}
.badge-owner, .badge-blue {
  background-color: var(--sapphire-subtle);
  color: var(--sky-accent);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

/* Layout */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.app-sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 40;
  transition: transform 0.2s ease;
}

.sidebar-header {
  height: var(--topbar-height);
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.brand-logo-box {
  width: 36px;
  height: 36px;
  background-color: var(--sapphire-subtle);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--sky-accent);
  font-weight: 800;
  font-size: 1.05rem;
  box-shadow: 0 0 12px rgba(37, 99, 235, 0.25);
}
.brand-info {
  display: flex;
  flex-direction: column;
}
.brand-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: -0.01em;
}
.brand-sub {
  font-size: 0.68rem;
  color: var(--sky-accent);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.sidebar-action-wrap {
  padding: 16px 20px 8px;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 12px 14px 80px;
}

.nav-group-title {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 16px 10px 6px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 12px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.12s ease;
  position: relative;
  user-select: none;
}
.nav-item:hover {
  background-color: var(--bg-surface-hover);
  color: var(--text-primary);
}
.nav-item.active {
  background-color: var(--sapphire-subtle);
  color: var(--sky-accent);
  font-weight: 600;
  border-left: 3px solid var(--sapphire-bright);
}
.nav-item .nav-badge {
  margin-left: auto;
  font-size: 0.68rem;
  padding: 2px 6px;
  border-radius: var(--radius-pill);
}

.sidebar-footer {
  padding: 14px 18px;
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
}
.user-profile-card {
  display: flex;
  align-items: center;
  gap: 10px;
}
.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  border: 1px solid var(--border-subtle);
}
.user-details {
  flex: 1;
  min-width: 0;
}
.user-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.user-status {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Main Content Area */
.app-main {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 100vh;
}

/* Topbar */
.app-topbar {
  height: var(--topbar-height);
  background-color: rgba(5, 8, 17, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  position: sticky;
  top: 0;
  z-index: 30;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 14px;
}
.topbar-title-group {
  display: flex;
  flex-direction: column;
}
.topbar-breadcrumbs {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  color: var(--sky-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.topbar-page-title {
  font-size: 1rem;
  font-weight: 700;
  color: #FFFFFF;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-icon-utility {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.12s ease;
}
.btn-icon-utility:hover {
  background-color: var(--bg-surface-hover);
  color: var(--text-primary);
  border-color: rgba(56, 189, 248, 0.3);
}

/* Page Body Container */
.page-container {
  flex: 1;
  padding: 28px;
  max-width: 1360px;
  width: 100%;
  margin: 0 auto;
  padding-bottom: 100px; /* Room for floating dock */
}

/* Hero Section */
.hero-member {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 36px;
  margin-bottom: 28px;
  position: relative;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

.hero-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
}
.hero-greeting {
  font-size: 1.5rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 4px;
}
.hero-sub {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Search Capsule */
.search-capsule-wrap {
  position: relative;
  max-width: 720px;
  margin: 0 auto 28px;
}
.search-capsule-input {
  width: 100%;
  height: 50px;
  background-color: var(--bg-obsidian);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  padding: 0 110px 0 48px;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.search-capsule-input:focus {
  border-color: var(--sapphire-bright);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}
.search-capsule-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}
.search-shortcut-badge {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  color: var(--sky-accent);
  font-family: var(--font-mono);
}

/* Quick Action 8-Grid */
.quick-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
@media (max-width: 1024px) {
  .quick-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .quick-grid { grid-template-columns: 1fr; }
}

.quick-card {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
  color: inherit;
}
.quick-card:hover {
  background-color: var(--bg-surface-hover);
  border-color: rgba(56, 189, 248, 0.3);
  transform: translateY(-2px);
}
.quick-icon-box {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.quick-icon-box.emerald, .quick-icon-box.sapphire {
  background-color: var(--sapphire-subtle);
  color: var(--sky-accent);
}
.quick-icon-box.blue {
  background-color: rgba(56, 189, 248, 0.15);
  color: var(--sky-accent);
}
.quick-icon-box.amber {
  background-color: var(--amber-subtle);
  color: var(--amber-gold);
}
.quick-icon-box.purple {
  background-color: rgba(147, 197, 253, 0.12);
  color: #93C5FD;
}

.quick-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.quick-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Cards & Surfaces */
.surface-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
}

.card-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}
.card-header-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #FFFFFF;
}

/* Progress Section */
.progress-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.progress-bar-bg {
  width: 100%;
  height: 8px;
  background-color: var(--bg-obsidian);
  border-radius: var(--radius-pill);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}
.progress-bar-fill {
  height: 100%;
  background-color: var(--sapphire-bright);
  box-shadow: 0 0 10px rgba(37, 99, 235, 0.6);
  border-radius: var(--radius-pill);
  transition: width 0.3s ease;
}

/* Floating Dock */
.floating-dock {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background-color: rgba(11, 17, 32, 0.92);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  padding: 6px 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  z-index: 50;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.6);
}
.dock-item {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-pill);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
  position: relative;
  text-decoration: none;
}
.dock-item:hover {
  background-color: var(--bg-surface-hover);
  color: var(--text-primary);
  transform: translateY(-3px);
}
.dock-item.active {
  background-color: var(--sapphire-bright);
  color: #FFFFFF;
  box-shadow: 0 0 12px rgba(37, 99, 235, 0.5);
}
.dock-divider {
  width: 1px;
  height: 20px;
  background-color: var(--border-subtle);
  margin: 0 4px;
}

/* Video Player Wrapper (Protected) */
.custom-video-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: #000000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  user-select: none;
}

.custom-video-iframe {
  width: 100%;
  height: 100%;
  border: none;
  pointer-events: none;
}

.video-shield-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 50px;
  z-index: 10;
  background: transparent;
  cursor: pointer;
}

.custom-video-controls {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 52px;
  background: linear-gradient(180deg, transparent 0%, rgba(5, 8, 17, 0.95) 100%);
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 18px;
  z-index: 20;
}

.video-progress-container {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background-color: rgba(255, 255, 255, 0.15);
  cursor: pointer;
  transition: height 0.15s ease;
}
.video-progress-container:hover {
  height: 7px;
}
.video-progress-filled {
  height: 100%;
  background-color: var(--sapphire-bright);
  box-shadow: 0 0 8px rgba(37, 99, 235, 0.8);
  width: 0%;
  position: relative;
}

/* Template Code Snippets */
.code-box {
  background-color: #03060C;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #E2E8F0;
  overflow-x: auto;
  white-space: pre-wrap;
  position: relative;
  max-height: 400px;
}

/* Modal */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(3, 5, 12, 0.82);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}
.modal-content {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  max-width: 650px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 28px;
  position: relative;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
}

/* Form Inputs */
.form-group {
  margin-bottom: 16px;
}
.form-label {
  display: block;
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.form-input, .form-textarea, .form-select {
  width: 100%;
  background-color: var(--bg-obsidian);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  color: var(--text-primary);
  font-size: 0.875rem;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--sapphire-bright);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}
.form-textarea {
  min-height: 100px;
  resize: vertical;
}

/* Table */
.data-table {
  width: 100%;
  border-collapse: collapse;
}
.data-table th {
  text-align: left;
  padding: 12px 16px;
  background-color: var(--bg-obsidian);
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-subtle);
}
.data-table td {
  padding: 14px 16px;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}
.data-table tr:hover td {
  background-color: var(--bg-surface-elevated);
  color: var(--text-primary);
}

/* ======================================================== */
/* 3D HARDWARE-ACCELERATED HERO SHOWCASE & TILT SYSTEM     */
/* ======================================================== */
.perspective-container {
  perspective: 1200px;
  transform-style: preserve-3d;
}

.hero-3d-stack {
  position: relative;
  width: 100%;
  max-width: 540px;
  height: 420px;
  margin: 0 auto;
  transform-style: preserve-3d;
  will-change: transform;
  transition: transform 0.12s cubic-bezier(0.2, 0, 0, 1);
}

.stack-layer {
  position: absolute;
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.65), 0 0 0 1px var(--border-subtle);
  transition: transform 0.12s cubic-bezier(0.2, 0, 0, 1), box-shadow 0.2s ease;
  will-change: transform;
  background: var(--bg-surface);
  overflow: hidden;
}

/* Back Layer: Dark Navy Google Sheets Table */
.stack-layer-back {
  top: 10px;
  left: 0;
  width: 440px;
  height: 250px;
  background: #090E1A;
  border: 1px solid rgba(56, 189, 248, 0.18);
  transform: translateZ(0px) rotateX(8deg) rotateY(-8deg);
  z-index: 1;
}

/* Middle Layer: Code.gs Window */
.stack-layer-middle {
  top: 90px;
  right: 10px;
  width: 400px;
  height: 230px;
  background: #0B1224;
  border: 1px solid rgba(37, 99, 235, 0.35);
  transform: translateZ(40px) rotateX(8deg) rotateY(-8deg);
  z-index: 2;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.75), 0 0 20px rgba(37, 99, 235, 0.15);
}

/* Front Layer: Finished Web App Card */
.stack-layer-front {
  bottom: 10px;
  left: 40px;
  width: 420px;
  background: #0E172C;
  border: 1px solid rgba(56, 189, 248, 0.35);
  transform: translateZ(80px) rotateX(8deg) rotateY(-8deg);
  z-index: 3;
  padding: 18px 22px;
  box-shadow: 0 36px 70px rgba(0, 0, 0, 0.8), 0 0 30px rgba(56, 189, 248, 0.18);
}

/* 3D Bento Tilt Card */
.bento-tilt-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  transform-style: preserve-3d;
  will-change: transform;
  transition: transform 0.18s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.18s ease, box-shadow 0.18s ease;
  position: relative;
  overflow: hidden;
}

.bento-tilt-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(56, 189, 248, 0.4), transparent);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.bento-tilt-card:hover {
  border-color: rgba(56, 189, 248, 0.35);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5), 0 0 24px rgba(37, 99, 235, 0.12);
}

.bento-tilt-card:hover::before {
  opacity: 1;
}

/* Landing Page Navbar */
.landing-navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(5, 8, 17, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
}

@media (max-width: 768px) {
  .app-sidebar {
    transform: translateX(-100%);
  }
  .app-sidebar.open {
    transform: translateX(0);
  }
  .app-main {
    margin-left: 0;
  }
  .page-container {
    padding: 16px;
  }
  .landing-navbar {
    padding: 0 20px;
  }
  .stack-layer-back, .stack-layer-middle, .stack-layer-front {
    width: 310px;
  }
  .hero-3d-stack {
    height: 340px;
  }
}