/* ========================================
   GERADOR DE CALENDÁRIO - CSS PRINCIPAL
   Autor: Arquiteto Web Sênior
   Última atualização: 2024
   ======================================== */

/* ========================================
   VARIÁVEIS CSS E TEMAS
   ======================================== */

:root {
  /* Cores base */
  --color-primary: #2563eb;
  --color-secondary: #64748b;
  --color-accent: #f59e0b;
  --color-background: #ffffff;
  --color-surface: #f8fafc;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;

  /* Tipografia */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;

  /* Espaçamento */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  --spacing-20: 5rem;

  /* Bordas */
  --border-radius: 0.5rem;
  --border-radius-lg: 1rem;
  --border-width: 1px;

  /* Sombras */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --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);

  /* Transições */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;

  /* Layout */
  --container-max-width: 1200px;
  --header-height: 4rem;
}

/* Temas por estação */
[data-theme="spring"] {
  --color-primary: #10b981;
  --color-secondary: #059669;
  --color-accent: #f59e0b;
  --color-background: #f0fdf4;
  --color-surface: #dcfce7;
}

[data-theme="summer"] {
  --color-primary: #f59e0b;
  --color-secondary: #d97706;
  --color-accent: #ef4444;
  --color-background: #fffbeb;
  --color-surface: #fef3c7;
}

[data-theme="autumn"] {
  --color-primary: #dc2626;
  --color-secondary: #b91c1c;
  --color-accent: #f59e0b;
  --color-background: #fef2f2;
  --color-surface: #fee2e2;
}

[data-theme="winter"] {
  --color-primary: #2563eb;
  --color-secondary: #1d4ed8;
  --color-accent: #06b6d4;
  --color-background: #f0f9ff;
  --color-surface: #e0f2fe;
}

[data-theme="minimal"] {
  --color-primary: #374151;
  --color-secondary: #6b7280;
  --color-accent: #111827;
  --color-background: #ffffff;
  --color-surface: #f9fafb;
}

[data-theme="vibrant"] {
  --color-primary: #7c3aed;
  --color-secondary: #a855f7;
  --color-accent: #ec4899;
  --color-background: #faf5ff;
  --color-surface: #f3e8ff;
}

[data-theme="corporate"] {
  --color-primary: #1e40af;
  --color-secondary: #3b82f6;
  --color-accent: #059669;
  --color-background: #eff6ff;
  --color-surface: #dbeafe;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #0f172a;
    --color-surface: #1e293b;
    --color-text: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-border: #334155;
  }
}

/* ========================================
   RESET E ESTILOS BASE
   ======================================== */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

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

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

/* ========================================
   LAYOUT E UTILITÁRIOS
   ======================================== */

.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-3);
  }
}

/* Flexbox utilities */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-2 {
  gap: var(--spacing-2);
}

.gap-4 {
  gap: var(--spacing-4);
}

/* Grid utilities */
.grid {
  display: grid;
}

.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-cols-7 {
  grid-template-columns: repeat(7, 1fr);
}

.gap-2 {
  gap: var(--spacing-2);
}

.gap-4 {
  gap: var(--spacing-4);
}

/* ========================================
   HEADER
   ======================================== */

.header {
  background-color: var(--color-surface);
  border-bottom: var(--border-width) solid var(--color-border);
  padding: var(--spacing-6) 0;
}

.header__title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-2);
  text-align: center;
}

.header__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  text-align: center;
}

/* ========================================
   MAIN CONTENT
   ======================================== */

.main {
  flex: 1;
  padding: var(--spacing-8) 0;
}

.section-title {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-6);
  text-align: center;
}

/* ========================================
   FORMULÁRIO DE CONFIGURAÇÃO
   ======================================== */

.config-section {
  margin-bottom: var(--spacing-12);
}

.config-form {
  background-color: var(--color-surface);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-8);
  box-shadow: var(--shadow-lg);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-6);
  margin-bottom: var(--spacing-6);
}

.form-group {
  margin-bottom: var(--spacing-4);
}

.form-label {
  display: block;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--spacing-2);
  font-size: var(--font-size-sm);
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--spacing-3);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  background-color: var(--color-background);
  color: var(--color-text);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-file {
  width: 100%;
  padding: var(--spacing-2);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  background-color: var(--color-background);
  color: var(--color-text);
  font-size: var(--font-size-sm);
}

.form-color {
  width: 60px;
  height: 40px;
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  cursor: pointer;
}

.form-help {
  display: block;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  margin-top: var(--spacing-1);
}

.color-picker-group {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-4);
  padding: var(--spacing-4);
  background-color: var(--color-background);
  border-radius: var(--border-radius);
  border: var(--border-width) solid var(--color-border);
}

/* ========================================
   BOTÕES
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-6);
  border-radius: var(--border-radius);
  font-weight: 500;
  font-size: var(--font-size-base);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: var(--border-width) solid transparent;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background-color: color-mix(in srgb, var(--color-primary) 90%, black);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--color-secondary);
  color: white;
}

.btn-secondary:hover:not(:disabled) {
  background-color: color-mix(in srgb, var(--color-secondary) 90%, black);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover:not(:disabled) {
  background-color: var(--color-primary);
  color: white;
}

.form-actions {
  display: flex;
  gap: var(--spacing-4);
  justify-content: flex-end;
  margin-top: var(--spacing-8);
}

/* ========================================
   SEÇÃO DO CALENDÁRIO
   ======================================== */

.calendar-section {
  margin-top: var(--spacing-12);
}

.calendar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-8);
  flex-wrap: wrap;
  gap: var(--spacing-4);
}

.calendar-title {
  font-size: var(--font-size-3xl);
  font-weight: 600;
  color: var(--color-text);
}

.calendar-container {
  position: relative;
  background-color: var(--color-background);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.calendar-cover {
  position: relative;
  height: 400px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: white;
}

.calendar-cover-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

.calendar-cover-title {
  position: relative;
  z-index: 2;
  background: rgba(0, 0, 0, 0.5);
  padding: var(--spacing-8);
  border-radius: var(--border-radius-lg);
  backdrop-filter: blur(10px);
}

.calendar-cover-title h1 {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  margin-bottom: var(--spacing-2);
}

.calendar-cover-title p {
  font-size: var(--font-size-xl);
  opacity: 0.9;
}

.calendar-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  opacity: 0.1;
  z-index: 1;
}

.calendar-content {
  position: relative;
  z-index: 2;
  padding: var(--spacing-8);
}

.calendar-month-year {
  text-align: center;
  margin-bottom: var(--spacing-8);
}

.calendar-month {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-2);
}

.calendar-year {
  font-size: var(--font-size-2xl);
  color: var(--color-text-muted);
  font-weight: 300;
}

.calendar-grid {
  background-color: var(--color-surface);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-6);
  box-shadow: var(--shadow);
}

.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-4);
}

.weekday {
  text-align: center;
  font-weight: 600;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  padding: var(--spacing-3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.calendar-days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: var(--spacing-2);
}

.calendar-day {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-background);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.calendar-day:hover {
  background-color: var(--color-primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.calendar-day.empty {
  background-color: transparent;
  border: none;
  cursor: default;
}

.calendar-day.empty:hover {
  background-color: transparent;
  transform: none;
  box-shadow: none;
}

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

.calendar-day.today:hover {
  background-color: color-mix(in srgb, var(--color-accent) 90%, black);
}

.calendar-day.weekend {
  background-color: color-mix(in srgb, var(--color-surface) 50%, white);
}

.calendar-day.weekend:hover {
  background-color: var(--color-primary);
}

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

.footer {
  background-color: var(--color-surface);
  border-top: var(--border-width) solid var(--color-border);
  padding: var(--spacing-6) 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* ========================================
   IMPRESSÃO
   ======================================== */

@media print {
  body {
    background-color: white;
  }
  
  .header,
  .footer,
  .calendar-header {
    display: none;
  }
  
  .config-section {
    display: none;
  }
  
  .calendar-section {
    display: block !important;
    margin: 0;
    padding: 0;
  }
  
  .calendar-container {
    box-shadow: none;
    border: 1px solid #ccc;
    page-break-inside: avoid;
  }
  
  .calendar-content {
    padding: 1rem;
  }
  
  .calendar-day {
    border: 1px solid #ccc !important;
  }
}

/* ========================================
   RESPONSIVIDADE
   ======================================== */

@media (max-width: 768px) {
  .header__title {
    font-size: var(--font-size-2xl);
  }
  
  .config-form {
    padding: var(--spacing-4);
  }
  
  .form-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-4);
  }
  
  .form-actions {
    flex-direction: column;
  }
  
  .calendar-header {
    flex-direction: column;
    text-align: center;
  }
  
  .calendar-content {
    padding: var(--spacing-4);
  }
  
  .calendar-month {
    font-size: var(--font-size-2xl);
  }
  
  .calendar-grid {
    padding: var(--spacing-4);
  }
  
  .weekday {
    font-size: var(--font-size-xs);
    padding: var(--spacing-2);
  }
  
  .calendar-day {
    font-size: var(--font-size-sm);
  }
}

@media (max-width: 480px) {
  .calendar-days {
    gap: var(--spacing-1);
  }
  
  .calendar-day {
    aspect-ratio: auto;
    min-height: 40px;
  }
}

/* ========================================
   ANIMAÇÕES
   ======================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.calendar-section {
  animation: fadeIn var(--transition-normal);
}

.calendar-day {
  animation: slideInUp var(--transition-normal);
  animation-fill-mode: both;
}

.calendar-day:nth-child(7n + 1) { animation-delay: 0.1s; }
.calendar-day:nth-child(7n + 2) { animation-delay: 0.15s; }
.calendar-day:nth-child(7n + 3) { animation-delay: 0.2s; }
.calendar-day:nth-child(7n + 4) { animation-delay: 0.25s; }
.calendar-day:nth-child(7n + 5) { animation-delay: 0.3s; }
.calendar-day:nth-child(7n + 6) { animation-delay: 0.35s; }
.calendar-day:nth-child(7n + 7) { animation-delay: 0.4s; }

/* ========================================
   ESTADOS DE CARREGAMENTO
   ======================================== */

.loading {
  position: relative;
  overflow: hidden;
}

.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.6),
    transparent
  );
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% {
    left: -100%;
  }
  100% {
    left: 100%;
  }
}

/* ========================================
   CLASSES UTILITÁRIAS ADICIONAIS
   ======================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

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

.mb-4 {
  margin-bottom: var(--spacing-4);
}

.mb-6 {
  margin-bottom: var(--spacing-6);
}

.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1em;
  height: 1em;
}

/* ========================================
   RESPONSIVIDADE AVANÇADA
   ======================================== */

@media (max-width: 1024px) {
  :root {
    --container-max-width: 968px;
  }
}

@media (max-width: 768px) {
  :root {
    --container-max-width: 100%;
  }
}

/* ========================================
   MELHORIAS DE PERFORMANCE
   ======================================== */

.calendar-day {
  will-change: transform;
}

.calendar-day:hover {
  will-change: auto;
}

/* ========================================
   CUSTOM SCROLLBAR
   ======================================== */

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-surface);
}

::-webkit-scrollbar-thumb {
  background: var(--color-secondary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}