/* ==========================================================================
   ToDoz - Modern Sovereign Productivity Design System
   Aesthetic: Sleek dark mode, glassmorphism, dynamic gradients, crisp typography
   ========================================================================== */

:root {
  --bg-primary: #0a0d14;
  --bg-secondary: #0f1523;
  --bg-surface: #141c2e;
  --bg-surface-elevated: rgba(26, 36, 58, 0.7);
  --bg-glass: rgba(18, 25, 42, 0.65);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(56, 189, 248, 0.35);

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

  --accent-cyan: #06b6d4;
  --accent-blue: #3b82f6;
  --accent-indigo: #6366f1;
  --accent-purple: #8b5cf6;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;

  --gradient-brand: linear-gradient(135deg, #06b6d4 0%, #3b82f6 50%, #8b5cf6 100%);
  --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.04) 0%, rgba(255, 255, 255, 0.01) 100%);
  --gradient-glow: radial-gradient(circle at 50% 0%, rgba(59, 130, 246, 0.25) 0%, rgba(10, 13, 20, 0) 70%);

  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --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 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 35px rgba(59, 130, 246, 0.2);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  line-height: 1.6;
  background: var(--bg-primary);
  background-image: 
    radial-gradient(at 10% 15%, rgba(6, 182, 212, 0.12) 0px, transparent 40%),
    radial-gradient(at 90% 20%, rgba(139, 92, 246, 0.14) 0px, transparent 45%),
    radial-gradient(at 50% 80%, rgba(59, 130, 246, 0.10) 0px, transparent 50%);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  background: rgba(10, 13, 20, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-glass);
  z-index: 1000;
  transition: all 0.3s ease;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.4);
}

.brand-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-full);
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* ==========================================================================
   Buttons & UI Elements
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.75rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  text-decoration: none;
  font-family: inherit;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(59, 130, 246, 0.55);
}

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

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

.btn-lg {
  padding: 0.95rem 1.85rem;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
  padding: 10.5rem 1.5rem 4rem;
  text-align: center;
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.25);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.75rem;
  box-shadow: 0 0 25px rgba(6, 182, 212, 0.2);
}

.hero-title {
  font-size: clamp(2.5rem, 5.5vw, 4.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  max-width: 950px;
  margin-left: auto;
  margin-right: auto;
}

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

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto 2.5rem;
  font-weight: 400;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 4rem;
}

/* ==========================================================================
   Interactive Hero UI Mockup (Calendar & Today view)
   ========================================================================== */

.mockup-wrapper {
  position: relative;
  max-width: 1040px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  padding: 1px;
  background: linear-gradient(180deg, rgba(56, 189, 248, 0.4) 0%, rgba(255, 255, 255, 0.05) 50%, transparent 100%);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.mockup-inner {
  background: var(--bg-surface);
  border-radius: calc(var(--radius-lg) - 1px);
  overflow: hidden;
  border: 1px solid var(--border-glass);
}

.mockup-header {
  height: 48px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.25rem;
}

.window-dots {
  display: flex;
  gap: 7px;
}

.dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.mockup-titlebar {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.mockup-content {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 440px;
  text-align: left;
}

.mockup-sidebar {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-glass);
  padding: 1.25rem 1rem;
}

.sidebar-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.sidebar-item.active {
  background: rgba(59, 130, 246, 0.15);
  color: #38bdf8;
  font-weight: 600;
}

.mockup-main {
  padding: 1.5rem 2rem;
  background: var(--bg-surface);
}

.mockup-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-glass);
}

.mockup-quickadd {
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: #cbd5e1;
}

.tag-preview {
  display: inline-flex;
  gap: 0.4rem;
}
.token-due { color: #38bdf8; font-weight: 600; }
.token-p1 { color: #f43f5e; font-weight: 600; }
.token-proj { color: #a855f7; font-weight: 600; }

.task-row {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.75rem 0.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.task-check {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--accent-rose);
  cursor: pointer;
  transition: background 0.2s;
}
.task-check.blue { border-color: var(--accent-blue); }
.task-check.amber { border-color: var(--accent-amber); }

.task-title {
  font-size: 0.92rem;
  font-weight: 500;
  flex: 1;
}

.task-badges {
  display: flex;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-date {
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.1);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
}

.badge-tag {
  color: #c084fc;
  background: rgba(192, 132, 252, 0.1);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   Features Section
   ========================================================================== */

.section {
  padding: 6rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-tag {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 650px;
  margin: 0 auto;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.75rem;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(59, 130, 246, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  margin-bottom: 1.5rem;
  border: 1px solid rgba(59, 130, 246, 0.25);
}

.feature-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.feature-card-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   Interactive Showcase / Tabbed View
   ========================================================================== */

.interactive-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.tab-nav {
  display: flex;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-glass);
  overflow-x: auto;
}

.tab-btn {
  padding: 1.1rem 1.8rem;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.95rem;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

.tab-btn.active {
  color: var(--text-primary);
  border-bottom-color: var(--accent-cyan);
  background: rgba(255, 255, 255, 0.02);
}

.tab-pane {
  display: none;
  padding: 3rem;
}

.tab-pane.active {
  display: block;
}

.code-box {
  background: #07090e;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: #38bdf8;
  overflow-x: auto;
  line-height: 1.8;
}

/* ==========================================================================
   Platform Downloads Matrix
   ========================================================================== */

.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.download-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.75rem;
  text-align: center;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.download-card:hover {
  transform: translateY(-5px);
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
}

.download-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.04);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  color: var(--accent-cyan);
}

.download-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.download-version {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.download-specs {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
  line-height: 1.5;
  flex: 1;
}

.download-btn {
  width: 100%;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  border-top: 1px solid var(--border-glass);
  background: var(--bg-secondary);
  padding: 4rem 1.5rem 2.5rem;
  margin-top: 6rem;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-legal {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-nav {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.footer-nav a:hover {
  color: var(--text-primary);
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */

@media (max-width: 850px) {
  .navbar {
    padding: 0 1.25rem;
  }
  .nav-links {
    display: none;
  }
  .mockup-content {
    grid-template-columns: 1fr;
  }
  .mockup-sidebar {
    display: none;
  }
  .hero {
    padding-top: 8rem;
  }
}