/* UglyCalc - Main Styles */
/* Modern, colorful, polished design */

/* ========================================
   CSS Custom Properties (Design Tokens)
   ======================================== */

:root {
  /* Base sizing */
  --font-base: 18px;
  --font-sm: 14px;
  --font-lg: 24px;
  --font-xl: 32px;
  --font-2xl: 48px;

  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  --button-min-size: 48px;
  --input-height: 56px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Light theme - warmer tones */
  --color-bg: #faf9f7;
  --color-bg-secondary: #f5f3f0;
  --color-bg-card: #ffffff;
  --color-text: #1a1a2e;
  --color-text-secondary: #5a5a72;
  --color-text-muted: #8a8a9a;
  --color-border: #e8e6e3;
  --color-border-hover: #d5d3d0;
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-primary-light: rgba(79, 70, 229, 0.08);
  --color-accent: #f43f5e;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-shadow: rgba(26, 26, 46, 0.06);
  --color-shadow-lg: rgba(26, 26, 46, 0.12);

  /* Category colors */
  --color-finance: #10b981;
  --color-finance-light: rgba(16, 185, 129, 0.08);
  --color-health: #ef4444;
  --color-health-light: rgba(239, 68, 68, 0.08);
  --color-date: #8b5cf6;
  --color-date-light: rgba(139, 92, 246, 0.08);
  --color-math: #3b82f6;
  --color-math-light: rgba(59, 130, 246, 0.08);
  --color-convert: #f59e0b;
  --color-convert-light: rgba(245, 158, 11, 0.08);
  --color-home: #06b6d4;
  --color-home-light: rgba(6, 182, 212, 0.08);
  --color-everyday: #ec4899;
  --color-everyday-light: rgba(236, 72, 153, 0.08);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  --gradient-hero: linear-gradient(135deg, #faf9f7 0%, #f0f0ff 50%, #fff5f5 100%);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark theme */
.dark-mode {
  --color-bg: #0f0f1a;
  --color-bg-secondary: #1a1a2e;
  --color-bg-card: #1e1e32;
  --color-text: #f5f5f7;
  --color-text-secondary: #a0a0b2;
  --color-text-muted: #6a6a7a;
  --color-border: #2a2a3e;
  --color-border-hover: #3a3a4e;
  --color-primary: #818cf8;
  --color-primary-hover: #a5b4fc;
  --color-primary-light: rgba(129, 140, 248, 0.12);
  --color-shadow: rgba(0, 0, 0, 0.4);
  --color-shadow-lg: rgba(0, 0, 0, 0.6);
  --gradient-hero: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 50%, #1e1e32 100%);

  --color-finance-light: rgba(16, 185, 129, 0.12);
  --color-health-light: rgba(239, 68, 68, 0.12);
  --color-date-light: rgba(139, 92, 246, 0.12);
  --color-math-light: rgba(59, 130, 246, 0.12);
  --color-convert-light: rgba(245, 158, 11, 0.12);
  --color-home-light: rgba(6, 182, 212, 0.12);
  --color-everyday-light: rgba(236, 72, 153, 0.12);
}

/* Senior mode */
.senior-mode {
  --font-base: 22px;
  --font-sm: 18px;
  --font-lg: 30px;
  --font-xl: 40px;
  --font-2xl: 56px;
  --spacing-xs: 0.75rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 2.5rem;
  --spacing-2xl: 4rem;
  --button-min-size: 64px;
  --input-height: 68px;
  --radius-md: 16px;
  --radius-lg: 20px;
}

/* ========================================
   Reset & Base
   ======================================== */

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

html {
  font-size: var(--font-base);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

a:hover {
  color: var(--color-primary-hover);
}

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.02em;
}

h1 { font-size: var(--font-2xl); }
h2 { font-size: var(--font-xl); }
h3 { font-size: var(--font-lg); }

p { margin-bottom: var(--spacing-md); }

/* ========================================
   Layout
   ======================================== */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.page-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  flex: 1;
  padding: var(--spacing-xl) 0;
}

/* ========================================
   Header - Compact Modern Design
   ======================================== */

.header {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}

.logo:hover { opacity: 0.85; }

.logo-img {
  height: 72px;
  width: auto;
}

.senior-mode .logo-img { height: 88px; }

/* Logo switching for dark mode */
.logo-light { display: block; }
.logo-dark { display: none; }
.dark-mode .logo-light { display: none; }
.dark-mode .logo-dark { display: block; }

/* Header Actions (theme toggle + menu) */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

/* Icon Buttons */
.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
}

.icon-btn.active,
.icon-btn[aria-pressed="true"] {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

/* Theme toggle icon switching */
.theme-icon-light { display: none; }
.theme-icon-dark { display: block; }
.dark-mode .theme-icon-light { display: block; }
.dark-mode .theme-icon-dark { display: none; }

/* Search Bar - inline in header */
.search-wrapper {
  position: relative;
  flex: 1;
  max-width: 320px;
  min-width: 120px;
}

.search-input {
  width: 100%;
  height: 40px;
  padding: 8px 16px 8px 40px;
  font-size: 0.9rem;
  font-family: inherit;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.search-input:hover { border-color: var(--color-border-hover); }

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background-color: var(--color-bg-card);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

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

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  pointer-events: none;
  color: var(--color-text-muted);
}

/* ========================================
   Mobile Menu
   ======================================== */

.menu-btn { display: flex; }

.mobile-menu {
  position: fixed;
  top: 0;
  right: -300px;
  width: 280px;
  max-width: 85vw;
  height: 100vh;
  background-color: var(--color-bg-card);
  box-shadow: -4px 0 24px var(--color-shadow-lg);
  z-index: 1000;
  transition: right 0.3s ease;
  display: flex;
  flex-direction: column;
}

.mobile-menu.open { right: 0; }

.mobile-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.mobile-menu-title {
  font-weight: 700;
  font-size: 1.1rem;
}

.mobile-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-sm) 0;
}

.mobile-nav-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--color-text);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.mobile-nav-item i {
  width: 24px;
  text-align: center;
  color: var(--color-text-secondary);
}

.mobile-nav-item:hover,
.mobile-nav-item.active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

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

.mobile-menu-settings {
  padding: var(--spacing-md);
  border-top: 1px solid var(--color-border);
}

.mobile-setting-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  width: 100%;
  padding: var(--spacing-md);
  background: var(--color-bg-secondary);
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mobile-setting-btn:hover { background: var(--color-border); }

.mobile-setting-btn i {
  color: var(--color-text-secondary);
}

.toggle-indicator {
  margin-left: auto;
  width: 44px;
  height: 24px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  position: relative;
  transition: background var(--transition-fast);
}

.toggle-indicator::after {
  content: '';
  position: absolute;
  left: 2px;
  top: 2px;
  width: 20px;
  height: 20px;
  background: white;
  border-radius: 50%;
  transition: transform var(--transition-fast);
}

.mobile-setting-btn[aria-pressed="true"] .toggle-indicator {
  background: var(--color-primary);
}

.mobile-setting-btn[aria-pressed="true"] .toggle-indicator::after {
  transform: translateX(20px);
}

.menu-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.menu-backdrop.open {
  opacity: 1;
  visibility: visible;
}

/* ========================================
   Desktop Category Navigation
   ======================================== */

.category-nav {
  display: none;
  background-color: var(--color-bg-secondary);
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.category-nav .container {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xs);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.category-nav .container::-webkit-scrollbar { display: none; }

.category-nav-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background-color: transparent;
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.category-nav-item i { font-size: 0.9em; }

.category-nav-item:hover {
  background-color: var(--color-bg-card);
  color: var(--color-primary);
}

.category-nav-item.active {
  background: var(--gradient-primary);
  color: white;
}

/* ========================================
   Toggle Buttons
   ======================================== */

.toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: var(--button-min-size);
  min-height: 44px;
  padding: 8px 16px;
  background-color: var(--color-bg-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.toggle-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.toggle-btn.active {
  background: var(--gradient-primary);
  color: white;
  border-color: transparent;
}

.toggle-btn-icon { font-size: 1.1em; }

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

.section-title {
  margin-bottom: var(--spacing-2xl);
  padding: var(--spacing-2xl) var(--spacing-lg);
  text-align: center;
  background: var(--gradient-hero);
  border-radius: var(--radius-xl);
  margin-top: calc(-1 * var(--spacing-xl));
}

.section-title h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-sm);
}

.section-subtitle {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  max-width: 500px;
  margin: 0 auto;
}

/* ========================================
   Calculator Grid (Homepage)
   ======================================== */

.calculator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.calculator-card {
  display: flex;
  flex-direction: column;
  padding: var(--spacing-xl);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 8px var(--color-shadow);
  transition: all var(--transition-normal);
  text-decoration: none;
  color: var(--color-text);
  position: relative;
}

.calculator-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px var(--color-shadow-lg);
  border-color: transparent;
  border-left-color: var(--color-primary);
}

.calculator-card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-sm);
  flex-shrink: 0;
}

.calculator-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.calculator-card-description {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  flex: 1;
  line-height: 1.6;
}

/* Category Sections with colored backgrounds */
.category-section {
  margin-bottom: var(--spacing-2xl);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
}

/* Finance */
.category-section[data-category="finance"] {
  background-color: var(--color-finance-light);
}
.category-section[data-category="finance"] .calculator-card {
  border-left-color: var(--color-finance);
}
.category-section[data-category="finance"] .calculator-card-icon {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--color-finance);
}

/* Health */
.category-section[data-category="health"] {
  background-color: var(--color-health-light);
}
.category-section[data-category="health"] .calculator-card {
  border-left-color: var(--color-health);
}
.category-section[data-category="health"] .calculator-card-icon {
  background-color: rgba(239, 68, 68, 0.15);
  color: var(--color-health);
}

/* Date */
.category-section[data-category="date"] {
  background-color: var(--color-date-light);
}
.category-section[data-category="date"] .calculator-card {
  border-left-color: var(--color-date);
}
.category-section[data-category="date"] .calculator-card-icon {
  background-color: rgba(139, 92, 246, 0.15);
  color: var(--color-date);
}

/* Math */
.category-section[data-category="math"] {
  background-color: var(--color-math-light);
}
.category-section[data-category="math"] .calculator-card {
  border-left-color: var(--color-math);
}
.category-section[data-category="math"] .calculator-card-icon {
  background-color: rgba(59, 130, 246, 0.15);
  color: var(--color-math);
}

/* Convert */
.category-section[data-category="convert"] {
  background-color: var(--color-convert-light);
}
.category-section[data-category="convert"] .calculator-card {
  border-left-color: var(--color-convert);
}
.category-section[data-category="convert"] .calculator-card-icon {
  background-color: rgba(245, 158, 11, 0.15);
  color: var(--color-convert);
}

/* Home */
.category-section[data-category="home"] {
  background-color: var(--color-home-light);
}
.category-section[data-category="home"] .calculator-card {
  border-left-color: var(--color-home);
}
.category-section[data-category="home"] .calculator-card-icon {
  background-color: rgba(6, 182, 212, 0.15);
  color: var(--color-home);
}

/* Everyday */
.category-section[data-category="everyday"] {
  background-color: var(--color-everyday-light);
}
.category-section[data-category="everyday"] .calculator-card {
  border-left-color: var(--color-everyday);
}
.category-section[data-category="everyday"] .calculator-card-icon {
  background-color: rgba(236, 72, 153, 0.15);
  color: var(--color-everyday);
}

.category-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

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

.footer {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0 var(--spacing-xl);
  margin-top: auto;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
  text-align: center;
}

.footer-links {
  display: flex;
  gap: var(--spacing-xl);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-link {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  transition: color var(--transition-fast);
}

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

.footer-copyright {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.footer-disclaimer {
  max-width: 700px;
  padding-top: var(--spacing-lg);
  margin-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.footer-disclaimer-text {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin: 0;
}

/* ========================================
   Utilities
   ======================================== */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

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

/* Desktop: show category nav, hide menu button */
@media (min-width: 769px) {
  .category-nav.desktop-only { display: block; }
  .menu-btn { display: none; }
}

/* Mobile */
@media (max-width: 768px) {
  .calculator-grid {
    grid-template-columns: 1fr;
  }

  .header-top {
    flex-wrap: wrap;
  }

  .logo-img {
    height: 64px;
  }

  .header-actions {
    gap: 4px;
  }

  .icon-btn {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }

  .search-wrapper {
    order: 10;
    flex-basis: 100%;
    max-width: 100%;
    margin-top: var(--spacing-sm);
  }

  .search-input {
    height: 44px;
    font-size: 0.95rem;
  }

  .category-section {
    padding: var(--spacing-lg);
    margin-left: calc(-1 * var(--spacing-md));
    margin-right: calc(-1 * var(--spacing-md));
    border-radius: 0;
  }
}

@media (max-width: 480px) {
  .logo-img {
    height: 56px;
  }

  .calculator-card {
    padding: var(--spacing-lg);
  }

  .footer-links {
    gap: var(--spacing-md);
  }
}