/* ============================================
   DESIGN SYSTEM - Curso de Inglês Irlanda
   Modern, Clean, Sophisticated
   ============================================ */

/* --- Google Font: Inter --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* --- Accessibility layer (shared across design-system pages) --- */
@import url('accessibility.css');

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
  /* Primary: Irish Emerald */
  --color-primary-50: #ecfdf5;
  --color-primary-100: #d1fae5;
  --color-primary-200: #a7f3d0;
  --color-primary-300: #6ee7b7;
  --color-primary-400: #34d399;
  --color-primary-500: #10b981;
  --color-primary-600: #059669;
  --color-primary-700: #047857;
  --color-primary-800: #065f46;
  --color-primary-900: #064e3b;

  /* Neutrals: Slate */
  --color-slate-50: #f8fafc;
  --color-slate-100: #f1f5f9;
  --color-slate-200: #e2e8f0;
  --color-slate-300: #cbd5e1;
  --color-slate-400: #94a3b8;
  --color-slate-500: #64748b;
  --color-slate-600: #475569;
  --color-slate-700: #334155;
  --color-slate-800: #1e293b;
  --color-slate-900: #0f172a;

  /* Accents */
  --color-amber-500: #f59e0b;
  --color-amber-100: #fef3c7;
  --color-rose-500: #f43f5e;
  --color-rose-100: #ffe4e6;
  --color-sky-500: #0ea5e9;
  --color-sky-100: #e0f2fe;
  --color-violet-500: #8b5cf6;
  --color-violet-100: #ede9fe;

  /* Semantic */
  --color-bg: #ffffff;
  --color-bg-soft: var(--color-slate-50);
  --color-bg-muted: var(--color-slate-100);
  --color-surface: #ffffff;
  --color-surface-elevated: #ffffff;
  --color-text: var(--color-slate-900);
  --color-text-secondary: var(--color-slate-500);
  --color-text-muted: var(--color-slate-400);
  --color-border: var(--color-slate-200);
  --color-border-light: var(--color-slate-100);

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);

  /* Radii */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

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

  /* Sidebar */
  --sidebar-width: 260px;
  --sidebar-collapsed: 72px;
  --header-height: 64px;
}

/* ============================================
   DARK MODE
   ============================================ */
[data-theme="dark"] {
  --color-bg: var(--color-slate-900);
  --color-bg-soft: var(--color-slate-800);
  --color-bg-muted: var(--color-slate-700);
  --color-surface: var(--color-slate-800);
  --color-surface-elevated: var(--color-slate-700);
  --color-text: var(--color-slate-50);
  --color-text-secondary: var(--color-slate-400);
  --color-text-muted: var(--color-slate-500);
  --color-border: var(--color-slate-700);
  --color-border-light: var(--color-slate-800);

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5), 0 4px 6px -4px rgb(0 0 0 / 0.5);
}

/* ============================================
   RESET & BASE
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg-soft);
  min-height: 100vh;
}

a {
  color: var(--color-primary-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-700);
}

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

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  letter-spacing: -0.025em;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

.text-xs { font-size: 0.75rem; }
.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: 1.5rem; }
.text-3xl { font-size: 1.875rem; }

.font-light { font-weight: 300; }
.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.font-extrabold { font-weight: 800; }

.text-muted { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }
.text-primary { color: var(--color-primary-600); }
.text-success { color: var(--color-primary-600); }
.text-warning { color: var(--color-amber-500); }
.text-danger { color: var(--color-rose-500); }
.text-info { color: var(--color-sky-500); }

/* ============================================
   LAYOUT UTILITIES
   ============================================ */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }
.block { display: block; }
.hidden { display: none; }

.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }

.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }

.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.flex-wrap { flex-wrap: wrap; }
.flex-1 { flex: 1 1 0%; }
.flex-shrink-0 { flex-shrink: 0; }

.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }

/* ============================================
   SPACING
   ============================================ */
.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }

.px-2 { padding-left: 0.5rem; padding-right: 0.5rem; }
.px-3 { padding-left: 0.75rem; padding-right: 0.75rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }

.py-1 { padding-top: 0.25rem; padding-bottom: 0.25rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-3 { padding-top: 0.75rem; padding-bottom: 0.75rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }

.m-0 { margin: 0; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }

.mr-2 { margin-right: 0.5rem; }
.mr-3 { margin-right: 0.75rem; }
.ml-auto { margin-left: auto; }

/* ============================================
   COMPONENTS: BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.25;
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn:focus {
  outline: transparent;
  box-shadow: 0 0 0 3px var(--color-primary-100);
}

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

.btn-primary:hover {
  background-color: var(--color-primary-700);
  border-color: var(--color-primary-700);
  color: white;
}

.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

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

.btn-danger {
  background-color: var(--color-rose-500);
  color: white;
  border-color: var(--color-rose-500);
}

.btn-danger:hover {
  background-color: #e11d48;
  border-color: #e11d48;
  color: white;
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
  border-color: transparent;
}

.btn-ghost:hover {
  background-color: var(--color-bg-muted);
  color: var(--color-text);
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
}

/* ============================================
   COMPONENTS: CARDS
   ============================================ */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-body {
  padding: 1.5rem;
}

.card-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
}

/* ============================================
   COMPONENTS: STAT CARD
   ============================================ */
.stat-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.stat-icon.green { background-color: var(--color-primary-100); color: var(--color-primary-600); }
.stat-icon.blue { background-color: var(--color-sky-100); color: var(--color-sky-500); }
.stat-icon.amber { background-color: var(--color-amber-100); color: var(--color-amber-500); }
.stat-icon.rose { background-color: var(--color-rose-100); color: var(--color-rose-500); }
.stat-icon.violet { background-color: var(--color-violet-100); color: var(--color-violet-500); }

.stat-value {
  font-size: 1.875rem;
  font-weight: 800;
  color: var(--color-text);
  line-height: 1;
  margin-bottom: 0.25rem;
}

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

/* ============================================
   COMPONENTS: FORMS
   ============================================ */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 0.375rem;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-size: 0.9375rem;
  font-family: inherit;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: transparent;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px var(--color-primary-100);
}

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

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* ============================================
   COMPONENTS: TABLES
   ============================================ */
.table-container,
.table-responsive {
  overflow-x: auto;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
}

.table-responsive .data-table {
  min-width: 640px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.data-table thead {
  background-color: var(--color-bg-muted);
}

.data-table th {
  padding: 0.875rem 1.25rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
}

.data-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text);
}

.data-table tbody tr {
  transition: background-color var(--transition-fast);
}

.data-table tbody tr:hover {
  background-color: var(--color-bg-soft);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

/* ============================================
   COMPONENTS: BADGES
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
}

.badge-green { background-color: var(--color-primary-100); color: var(--color-primary-700); }
.badge-blue { background-color: var(--color-sky-100); color: var(--color-slate-700); }
.badge-amber { background-color: var(--color-amber-100); color: #92400e; }
.badge-rose { background-color: var(--color-rose-100); color: #be123c; }
.badge-slate { background-color: var(--color-slate-100); color: var(--color-slate-700); }

/* ============================================
   COMPONENTS: PROGRESS
   ============================================ */
.progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--color-bg-muted);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background-color: var(--color-primary-500);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

/* ============================================
   COMPONENTS: MODAL
   ============================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background-color: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-base);
}

.modal-overlay.active .modal-content {
  transform: scale(1) translateY(0);
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--color-border-light);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* ============================================
   COMPONENTS: TOAST
   ============================================ */
.toast-container {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 1100;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 300px;
  animation: toastIn 300ms ease forwards;
}

.toast.success { border-left: 4px solid var(--color-primary-500); }
.toast.error { border-left: 4px solid var(--color-rose-500); }
.toast.warning { border-left: 4px solid var(--color-amber-500); }

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

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

.toast.hiding {
  animation: toastOut 300ms ease forwards;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

.animate-fade-in {
  animation: fadeIn 400ms ease forwards;
}

.animate-fade-in-up {
  animation: fadeInUp 400ms ease forwards;
}

.animate-slide-in-left {
  animation: slideInLeft 400ms ease forwards;
}

/* Stagger children */
.stagger-children > * {
  opacity: 0;
  animation: fadeInUp 400ms ease forwards;
}

.stagger-children > *:nth-child(1) { animation-delay: 0ms; }
.stagger-children > *:nth-child(2) { animation-delay: 50ms; }
.stagger-children > *:nth-child(3) { animation-delay: 100ms; }
.stagger-children > *:nth-child(4) { animation-delay: 150ms; }
.stagger-children > *:nth-child(5) { animation-delay: 200ms; }
.stagger-children > *:nth-child(6) { animation-delay: 250ms; }

/* ============================================
   RESPONSIVE UTILITIES
   ============================================ */
@media (max-width: 768px) {
  .hide-mobile { display: none !important; }
  .container { padding: 0 1rem; }
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.25rem; }
}

@media (min-width: 769px) {
  .hide-desktop { display: none !important; }
}

/* ============================================
   SCROLLBAR
   ============================================ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background-color: var(--color-slate-300);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background-color: var(--color-slate-400);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background-color: var(--color-slate-600);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background-color: var(--color-slate-500);
}