/* ============================================ */
/* DARK MINIMALIST BENTO GRID - COLOR SYSTEM */
/* ============================================ */

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

:root {
  /* Pure Black Palette */
  --bg-primary: #000000;
  --bg-secondary: #121212;
  --bg-tertiary: #1C1C1E;
  
  /* Text Colors */
  --text-primary: #FFFFFF;
  --text-secondary: #B0B0B0;
  --text-muted: #9A9A9A;
  
  /* Glassmorphism */
  --glass-bg: rgba(28, 28, 30, 0.8);
  --glass-border: rgba(255, 255, 255, 0.08);
  
  /* Spacing */
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  
  /* Border Radius - Heavy rounded */
  --radius-sm: 16px;
  --radius-md: 20px;
  --radius-lg: 24px;
  --radius-xl: 28px;
  
  /* Transitions */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================ */
/* BASE STYLES */
/* ============================================ */

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-weight: 400;
  padding-bottom: 100px; /* Space for floating nav */
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text-primary);
}

/* ============================================ */
/* FLOATING NAVIGATION */
/* ============================================ */

.navbar {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  padding: 0;
  background: transparent;
  border: none;
  box-shadow: none;
}

.navbar .container {
  padding: 0;
  max-width: auto;
  display: flex;
  justify-content: center;
  align-items: center;
}

.nav-content {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 12px 20px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
}

.nav-brand {
  display: none; /* Hidden in floating nav */
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--space-xs);
  margin: 0;
  padding: 0;
}

.nav-links li {
  margin: 0;
}

.nav-links a {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  padding: 10px 16px;
  border-radius: 50px;
  transition: var(--transition);
  font-size: 14px;
  white-space: nowrap;
}

.nav-links a:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.nav-links a.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.1);
}

/* Mobile nav adjustments */
@media (max-width: 768px) {
  .nav-links a span {
    display: none; /* Icon only on mobile */
  }
  
  .nav-content {
    padding: 10px 16px;
  }
}

/* ============================================ */
/* CONTAINER & LAYOUT */
/* ============================================ */

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ============================================ */
/* HERO SECTION - BENTO STYLE */
/* ============================================ */

.hero {
  padding: var(--space-2xl) 0 var(--space-xl);
  background: var(--bg-primary);
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.hero-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: 72px;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
  margin-bottom: var(--space-md);
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  line-height: 1.6;
  font-weight: 400;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-visual {
  display: none; /* Minimalist - no mockup */
}

/* ============================================ */
/* BUTTONS */
/* ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 32px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  font-family: 'Inter', sans-serif;
}

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

.btn-primary:hover {
  opacity: 0.9;
}

/* ============================================ */
/* BENTO GRID - BENEFITS */
/* ============================================ */

.benefits {
  padding: var(--space-xl) 0;
}

.section-title {
  text-align: center;
  font-size: 48px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: var(--space-xl);
  letter-spacing: -0.02em;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.benefit-card {
  background: var(--bg-secondary);
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  border: 1px solid transparent;
  transition: var(--transition);
}

.benefit-card:hover {
  background: var(--bg-tertiary);
  border-color: var(--glass-border);
}

.benefit-icon {
  font-size: 32px;
  margin-bottom: var(--space-md);
  opacity: 0.9;
}

.benefit-card h3 {
  font-size: 20px;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  font-weight: 700;
}

.benefit-card p {
  color: var(--text-secondary);
  line-height: 1.6;
  font-size: 15px;
}

/* ============================================ */
/* CTA SECTION */
/* ============================================ */

.cta-section {
  padding: var(--space-2xl) 0;
  text-align: center;
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  margin: var(--space-xl) 0;
}

.cta-section h2 {
  font-size: 42px;
  margin-bottom: var(--space-sm);
  font-weight: 800;
  color: var(--text-primary);
}

.cta-section p {
  font-size: 18px;
  margin-bottom: var(--space-lg);
  color: var(--text-secondary);
}

/* ============================================ */
/* APP DASHBOARD - BENTO LAYOUT */
/* ============================================ */

.app-section {
  padding: var(--space-xl) 0;
  min-height: 100vh;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.stat-card {
  background: var(--bg-secondary);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  transition: var(--transition);
}

.stat-card:hover {
  border-color: var(--glass-border);
}

.stat-card h3 {
  font-size: 48px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  letter-spacing: -0.02em;
}

.stat-card p {
  color: var(--text-muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
}

/* ============================================ */
/* APP CARD - MAIN INTERFACE */
/* ============================================ */

.app-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  border: 1px solid transparent;
}

/* Task Input */
.task-input-section {
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.task-input,
.task-date,
.task-category {
  padding: 14px var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: 15px;
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  transition: var(--transition);
}

.task-input::placeholder {
  color: var(--text-muted);
}

.task-input:focus,
.task-date:focus,
.task-category:focus {
  outline: none;
  border-color: var(--glass-border);
  background: var(--bg-primary);
}

/* Tag Input */
.tag-input-section {
  margin-bottom: var(--space-lg);
}

.tag-input {
  width: 100%;
  padding: 14px var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  margin-bottom: var(--space-sm);
}

.tag-input::placeholder {
  color: var(--text-muted);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  min-height: 36px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: var(--transition);
}

.tag:hover {
  background: var(--bg-primary);
  opacity: 0.8;
}

/* ============================================ */
/* FILTERS */
/* ============================================ */

.filters {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--glass-border);
  flex-wrap: wrap;
}

.filter-btn {
  padding: 10px 20px;
  background: var(--bg-tertiary);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  font-family: 'Inter', sans-serif;
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--glass-border);
}

.filter-btn.active {
  background: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
}

.category-filter {
  padding: 10px 16px;
  background: var(--bg-tertiary);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  margin-left: auto;
  font-family: 'Inter', sans-serif;
}

/* ============================================ */
/* TASK LIST */
/* ============================================ */

.tasks-list {
  min-height: 400px;
}

.task-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-sm);
  transition: var(--transition);
  border: 1px solid transparent;
}

.task-item:hover {
  border-color: var(--glass-border);
}

.task-item.completed {
  opacity: 0.5;
}

.task-checkbox {
  width: 24px;
  height: 24px;
  border: 2px solid var(--text-secondary);
  border-radius: 8px;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  background: transparent;
}

.task-checkbox:hover {
  border-color: var(--text-primary);
}

.task-checkbox.checked {
  background: var(--text-primary);
  border-color: var(--text-primary);
}

.task-checkbox.checked::after {
  content: '✓';
  color: var(--bg-primary);
  font-size: 14px;
  font-weight: bold;
}

.task-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.task-text {
  font-size: 15px;
  color: var(--text-primary);
  font-weight: 500;
}

.task-item.completed .task-text {
  text-decoration: line-through;
  color: var(--text-muted);
}

.task-meta {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  align-items: center;
}

.task-category-badge {
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 700;
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1px solid var(--glass-border);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.task-date-badge {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.task-tags {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.task-tag {
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1px solid var(--glass-border);
}

.task-delete {
  padding: 8px 14px;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
  flex-shrink: 0;
  font-family: 'Inter', sans-serif;
}

.task-delete:hover {
  background: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
}

/* ============================================ */
/* EMPTY STATE */
/* ============================================ */

.empty-state {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
}

.empty-icon {
  font-size: 64px;
  margin-bottom: var(--space-md);
  opacity: 0.3;
}

.empty-state h3 {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
  font-weight: 700;
}

.empty-state p {
  color: var(--text-muted);
  font-size: 15px;
}

/* ============================================ */
/* PAGE SECTIONS */
/* ============================================ */

.page-section {
  padding: var(--space-2xl) 0;
  min-height: 100vh;
}

.page-title {
  font-size: 56px;
  font-weight: 800;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: var(--space-xl);
}

/* ============================================ */
/* FEATURES - BENTO GRID */
/* ============================================ */

.features-list {
  display: grid;
  gap: var(--space-md);
  max-width: 1200px;
  margin: 0 auto;
}

.feature-item {
  display: flex;
  gap: var(--space-lg);
  background: var(--bg-secondary);
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  border: 1px solid transparent;
  transition: var(--transition);
}

.feature-item:hover {
  border-color: var(--glass-border);
}

.feature-icon {
  font-size: 40px;
  flex-shrink: 0;
  opacity: 0.9;
}

.feature-content h3 {
  font-size: 20px;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  font-weight: 700;
}

.feature-content p {
  color: var(--text-secondary);
  line-height: 1.6;
  font-size: 15px;
}

/* ============================================ */
/* CONTENT CARD */
/* ============================================ */

.content-card {
  background: var(--bg-secondary);
  padding: var(--space-2xl);
  border-radius: var(--radius-xl);
  max-width: 900px;
  margin: 0 auto;
  border: 1px solid transparent;
}

.content-card h2 {
  font-size: 28px;
  color: var(--text-primary);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
  font-weight: 700;
}

.content-card h2:first-child {
  margin-top: 0;
}

.content-card p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-md);
  font-size: 15px;
}

.philosophy-list {
  list-style: none;
  padding-left: 0;
}

.philosophy-list li {
  padding: var(--space-md);
  margin-bottom: var(--space-sm);
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  line-height: 1.7;
  border: 1px solid transparent;
  transition: var(--transition);
}

.philosophy-list li:hover {
  border-color: var(--glass-border);
}

.philosophy-list strong {
  color: var(--text-primary);
  font-weight: 700;
}

/* ============================================ */
/* CONTACT - BENTO GRID */
/* ============================================ */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.contact-info {
  background: var(--bg-secondary);
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  height: fit-content;
  border: 1px solid transparent;
}

.contact-info h2 {
  font-size: 24px;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  font-weight: 700;
}

.contact-item {
  margin-bottom: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: var(--transition);
}

.contact-item:hover {
  border-color: var(--glass-border);
}

.contact-item h3 {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.contact-item p {
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 500;
}

.contact-form-card {
  background: var(--bg-secondary);
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  border: 1px solid transparent;
}

.contact-form-card h2 {
  font-size: 24px;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  font-weight: 700;
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-group label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 14px var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-family: 'Inter', sans-serif;
  color: var(--text-primary);
  transition: var(--transition);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--glass-border);
  background: var(--bg-primary);
}

.form-textarea {
  resize: vertical;
  min-height: 140px;
}

.contact-status {
  margin-top: var(--space-sm);
  font-size: 14px;
  font-weight: 600;
  padding: var(--space-sm);
  border-radius: var(--radius-md);
  text-align: center;
}

/* ============================================ */
/* FOOTER */
/* ============================================ */

.footer {
  background: transparent;
  border-top: 1px solid var(--glass-border);
  color: var(--text-muted);
  padding: var(--space-xl) 0;
  text-align: center;
  margin-top: var(--space-2xl);
}

.footer p {
  font-size: 13px;
  font-weight: 500;
}

/* ============================================ */
/* RESPONSIVE */
/* ============================================ */

@media (max-width: 768px) {
  .hero-title {
    font-size: 42px;
  }

  .section-title,
  .page-title {
    font-size: 36px;
  }

  .task-input-section {
    grid-template-columns: 1fr;
  }

  .category-filter {
    width: 100%;
    margin-left: 0;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .benefits-grid {
    grid-template-columns: 1fr;
  }

  .feature-item {
    flex-direction: column;
  }

  body {
    padding-bottom: 80px;
  }

  .navbar {
    bottom: 16px;
  }
  
  .nav-content {
    gap: 4px;
    padding: 8px 12px;
  }
  
  .nav-links a {
    padding: 8px 12px;
  }
}