/* ==========================================================================
   XEMAMLICH.COM - Main Stylesheet
   Vietnamese Lunar Calendar Application
   Created: November 30, 2025
   ========================================================================== */

/* ==========================================================================
   0. GLOBAL BASE STYLES
   ========================================================================== */
html {
  scroll-behavior: smooth;
}

body {
  background-color: #fafaf9; /* stone-50 */
  color: #1c1917; /* stone-900 */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.font-vietnamese {
  font-feature-settings: 'liga' 1, 'calt' 1;
}

/* Card Components */
.card {
  border-radius: 0.5rem;
  background-color: white;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  border: 1px solid #e7e5e4; /* stone-200 */
  overflow: hidden;
}

.card-hover {
  transition: all 0.2s;
}

.card-hover:hover {
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  border-color: #d6d3d1; /* stone-300 */
}

/* ==========================================================================
   1. CSS VARIABLES (Design System)
   ========================================================================== */
:root {
  /* Color Palette - Vietnamese Cultural Colors */
  --color-primary-50: #fef2f2;
  --color-primary-100: #fee2e2;
  --color-primary-200: #fecaca;
  --color-primary-300: #fca5a5;
  --color-primary-400: #f87171;
  --color-primary-500: #ef4444;
  --color-primary-600: #dc2626;
  --color-primary-700: #b91c1c;
  --color-primary-800: #991b1b;
  --color-primary-900: #7f1d1d;

  /* Green/Jade Colors */
  --color-green-50: #f0fdf4;
  --color-green-100: #dcfce7;
  --color-green-200: #bbf7d0;
  --color-green-300: #86efac;
  --color-green-400: #4ade80;
  --color-green-500: #22c55e;
  --color-green-600: #16a34a;
  --color-green-700: #15803d;
  --color-green-800: #166534;
  --color-green-900: #14532d;

  /* Golden Colors */
  --color-golden-50: #fffbeb;
  --color-golden-100: #fef3c7;
  --color-golden-200: #fde68a;
  --color-golden-300: #fcd34d;
  --color-golden-400: #fbbf24;
  --color-golden-500: #f59e0b;
  --color-golden-600: #d97706;
  --color-golden-700: #b45309;
  --color-golden-800: #92400e;
  --color-golden-900: #78350f;

  /* Neutral/Stone Colors */
  --color-stone-50: #fafaf9;
  --color-stone-100: #f5f5f4;
  --color-stone-200: #e7e5e4;
  --color-stone-300: #d6d3d1;
  --color-stone-400: #a8a29e;
  --color-stone-500: #78716c;
  --color-stone-600: #57534e;
  --color-stone-700: #44403c;
  --color-stone-800: #292524;
  --color-stone-900: #1c1917;

  /* Semantic Colors */
  --color-success: var(--color-green-600);
  --color-warning: var(--color-golden-500);
  --color-danger: var(--color-primary-600);
  --color-info: #3b82f6;

  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-family-vietnamese: 'Noto Sans', var(--font-family-base);

  /* Spacing Scale */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;

  /* Layout */
  --navbar-height: 48px;
  --container-max-width: 1440px;
  --content-max-width: 1280px;
}

/* ==========================================================================
   2. RESET & BASE STYLES
   ========================================================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-base);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-stone-900);
  background: linear-gradient(135deg, var(--color-stone-50) 0%, var(--color-green-50) 100%);
  min-height: 100vh;
  padding-top: var(--navbar-height);
  position: relative;
}

/* Background pattern with fade-in animation */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #fafaf9;
  background-image: url('/images/bg/lich-am-bg-lossless.webp');
  background-size: 280px 280px;
  background-repeat: repeat;
  opacity: 0;
  z-index: -1;
  pointer-events: none;
  animation: fadeInBg 0.3s ease-in 0.2s forwards;
}

@keyframes fadeInBg {
  from { opacity: 0.5; }
  to { opacity: 1; }
}

/* Mobile optimization - lighter opacity */
@media (max-width: 768px) {
  body::before {
    background-size: 200px 200px;
  }
  
  @keyframes fadeInBg {
    from { opacity: 0.5; }
    to { opacity: 1; }
  }
}

/* Fallback for browsers without WebP support */
@supports not (background-image: url('data:image/webp;base64,')) {
  body::before {
    background-image: url('/images/bg/lich-am-bg.png');
  }
}

/* Vietnamese Typography */
.font-vietnamese {
  font-family: var(--font-family-vietnamese);
  font-feature-settings: 'liga' 1, 'calt' 1;
}

/* ==========================================================================
   3. LAYOUT COMPONENTS
   ========================================================================== */

/* Container */
.container {
  width: 100%;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--spacing-lg);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--spacing-2xl);
  }
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-green-200);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
}

@media (min-width: 640px) {
  .navbar-container {
    padding: 0 1.5rem;
  }
}

@media (min-width: 1024px) {
  .navbar-container {
    padding: 0 3rem;
  }
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  color: var(--color-green-800);
  font-weight: 700;
  font-size: 1.25rem;
}

.navbar-logo {
  width: 32px;
  height: 32px;
}

.navbar-brand-subtitle {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--color-green-700);
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  list-style: none;
}

.navbar-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  text-decoration: none;
  color: var(--color-green-700);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.navbar-link:hover {
  background: var(--color-green-50);
  color: var(--color-green-800);
}

.navbar-link.active {
  background: var(--color-green-100);
  color: var(--color-green-900);
}

.navbar-icon {
  width: 16px;
  height: 16px;
}

.navbar-toggle-icon {
  width: 20px;
  height: 20px;
}

/* Mobile Menu Toggle */
.navbar-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--spacing-sm);
  cursor: pointer;
  color: var(--color-green-700);
}

@media (max-width: 768px) {
  .navbar-toggle {
    display: block;
  }

  .navbar-nav {
    display: none;
    position: absolute;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
  }

  .navbar-nav.active {
    display: flex;
  }
}

/* Main Content */
.main-content {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem 1rem;
}

@media (min-width: 640px) {
  .main-content {
    padding: 1rem 1.5rem;
  }
}

@media (min-width: 1024px) {
  .main-content {
    padding: 1.25rem 3rem;
  }
}

/* Footer */
.footer {
  background: linear-gradient(135deg, var(--color-green-800) 0%, var(--color-green-700) 50%, var(--color-green-900) 100%);
  color: white;
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-3xl);
}

.footer-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (min-width: 640px) {
  .footer-container {
    padding: 0 var(--spacing-lg);
  }
}

@media (min-width: 1024px) {
  .footer-container {
    padding: 0 3rem;
  }
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: white;
}

.footer-icon {
  width: 24px;
  height: 24px;
  color: white;
}

.footer-text {
  color: var(--color-green-100);
  font-size: 0.875rem;
  line-height: 1.6;
}

.footer-text-small {
  color: var(--color-green-100);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-sm);
}

.footer-text-small a {
  color: white;
}

.footer-link {
  display: block;
  color: var(--color-green-100);
  text-decoration: none;
  margin-bottom: var(--spacing-sm);
  transition: color var(--transition-base);
}

.footer-link:hover {
  color: white;
}

.footer-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: var(--spacing-md);
  text-align: center;
  color: var(--color-green-200);
  font-size: 0.875rem;
}

.footer-separator {
  margin: 0 var(--spacing-sm);
}

/* ==========================================================================
   4. CALENDAR COMPONENTS
   ========================================================================== */

/* Calendar Grid */
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 1px;
  background: var(--color-green-600);
  border: 1px solid var(--color-green-600);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

/* Calendar Header */
.calendar-header {
  background: var(--color-green-700);
  color: white;
  padding: var(--spacing-sm);
  text-align: center;
  font-weight: 600;
  font-size: 0.875rem;
}

/* Calendar Day Cell */
.calendar-day {
  background: white;
  padding: var(--spacing-sm);
  min-height: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
}

.calendar-day:hover {
  background: var(--color-green-50);
  transform: scale(1.02);
  z-index: 10;
  box-shadow: var(--shadow-md);
}

.calendar-day.today {
  background: var(--color-green-600);
  color: white;
  font-weight: 700;
}

.calendar-day.selected {
  background: var(--color-primary-600);
  color: white;
  font-weight: 700;
}

.calendar-day.other-month {
  background: var(--color-stone-100);
  color: var(--color-stone-400);
}

.calendar-day.holiday {
  background: var(--color-golden-50);
  color: var(--color-golden-700);
}

.calendar-day.good-day {
  background: var(--color-green-50);
  border-left: 3px solid var(--color-green-600);
}

.calendar-day.bad-day {
  background: var(--color-primary-50);
  border-left: 3px solid var(--color-primary-600);
}

/* Calendar Day Content */
.calendar-day-solar {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.calendar-day-lunar {
  font-size: 0.75rem;
  color: var(--color-stone-500);
}

.calendar-day.today .calendar-day-lunar,
.calendar-day.selected .calendar-day-lunar {
  color: rgba(255, 255, 255, 0.9);
}

/* ==========================================================================
   5. UI COMPONENTS
   ========================================================================== */

/* Cards */
.card {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-stone-200);
  overflow: hidden;
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-stone-300);
}

.card-header {
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-stone-200);
  background: var(--color-stone-50);
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-stone-900);
  margin: 0;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  line-height: 1.5;
}

.btn-primary {
  background: var(--color-green-600);
  color: white;
}

.btn-primary:hover {
  background: var(--color-green-700);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--color-stone-100);
  color: var(--color-stone-700);
}

.btn-secondary:hover {
  background: var(--color-stone-200);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--color-green-600);
  color: var(--color-green-600);
}

.btn-outline:hover {
  background: var(--color-green-600);
  color: white;
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.8125rem;
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1rem;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  line-height: 1;
}

.badge-success {
  background: var(--color-green-100);
  color: var(--color-green-800);
}

.badge-warning {
  background: var(--color-golden-100);
  color: var(--color-golden-800);
}

.badge-danger {
  background: var(--color-primary-100);
  color: var(--color-primary-800);
}

.badge-info {
  background: #dbeafe;
  color: #1e40af;
}

/* Info Panels */
.info-panel {
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-green-200);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.info-panel-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-green-600);
}

.info-panel-icon {
  width: 24px;
  height: 24px;
  color: var(--color-green-600);
}

.info-panel-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-green-800);
  margin: 0;
}

.info-panel-content {
  color: var(--color-stone-700);
  line-height: 1.7;
}

/* ==========================================================================
   6. UTILITY CLASSES
   ========================================================================== */

/* Spacing */
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }
.p-5 { padding: var(--spacing-xl); }

/* Text */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.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: 1.4rem; }
.text-3xl { font-size: 1.875rem; }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

/* Colors */
.text-green { color: var(--color-green-700); }
.text-golden { color: var(--color-golden-700); }
.text-red { color: var(--color-primary-700); }
.text-gray { color: var(--color-stone-600); }

.bg-green { background: var(--color-green-50); }
.bg-golden { background: var(--color-golden-50); }
.bg-red { background: var(--color-primary-50); }

/* Flexbox */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--spacing-sm); }
.gap-3 { gap: var(--spacing-md); }
.gap-4 { gap: var(--spacing-lg); }

/* Grid */
.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Display */
.hidden { display: none; }
.block { display: block; }

/* ==========================================================================
   7. ANIMATIONS
   ========================================================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    transform: translateY(10px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes slideDown {
  from {
    transform: translateY(-10px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.animate-fade-in {
  animation: fadeIn 0.5s ease-in-out;
}

.animate-slide-up {
  animation: slideUp 0.3s ease-out;
}

.animate-slide-down {
  animation: slideDown 0.3s ease-out;
}

/* Loading Spinner */
.spinner {
  border: 3px solid var(--color-stone-200);
  border-top-color: var(--color-green-600);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ==========================================================================
   8. RESPONSIVE BREAKPOINTS
   ========================================================================== */

@media (max-width: 640px) {
  .calendar-day {
    min-height: 60px;
    padding: var(--spacing-xs);
  }
  
  .calendar-day-solar {
    font-size: 0.875rem;
  }
  
  .calendar-day-lunar {
    font-size: 0.6875rem;
  }
}

@media (min-width: 768px) {
  .calendar-day {
    min-height: 100px;
  }
}

@media (min-width: 1024px) {
  .calendar-day {
    min-height: 120px;
  }
}