/* Design System - Plataforma de Estudo Manejo de Vias Aéreas */
:root {
  --primary-color: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: #e0f2fe;
  --accent-color: #06b6d4;
  --secondary-color: #3b82f6;
  
  --bg-body: #f8fafc;
  --bg-card: #ffffff;
  --bg-sidebar: #0f172a;
  --text-sidebar: #94a3b8;
  --text-sidebar-active: #ffffff;
  
  --text-main: #1e293b;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --card-hover-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  
  --alert-warning-bg: #fffbeb;
  --alert-warning-border: #fde68a;
  --alert-warning-text: #92400e;
  
  --alert-danger-bg: #fef2f2;
  --alert-danger-border: #fecaca;
  --alert-danger-text: #991b1b;
  
  --alert-info-bg: #f0f9ff;
  --alert-info-border: #bae6fd;
  --alert-info-text: #075985;
  
  --alert-success-bg: #f0fdf4;
  --alert-success-border: #bbf7d0;
  --alert-success-text: #166534;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

[data-theme="dark"] {
  --bg-body: #090d16;
  --bg-card: #131c2e;
  --bg-sidebar: #070a12;
  --text-sidebar: #64748b;
  --text-sidebar-active: #38bdf8;
  
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --border-color: #1e293b;
  
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --card-hover-shadow: 0 10px 20px -3px rgba(0, 0, 0, 0.6);
  
  --alert-warning-bg: #2d2006;
  --alert-warning-border: #78350f;
  --alert-warning-text: #fde68a;
  
  --alert-danger-bg: #311313;
  --alert-danger-border: #7f1d1d;
  --alert-danger-text: #fecaca;
  
  --alert-info-bg: #0c2a3a;
  --alert-info-border: #0369a1;
  --alert-info-text: #bae6fd;
  
  --alert-success-bg: #092e1b;
  --alert-success-border: #14532d;
  --alert-success-text: #bbf7d0;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.6;
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* App Container Layout */
#app-container {
  display: flex;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar Styling */
aside.sidebar {
  width: 320px;
  background-color: var(--bg-sidebar);
  display: flex;
  flex-direction: column;
  border-right: 1px solid rgba(255, 255, 255, 0.05);
  z-index: 100;
  transition: transform var(--transition-normal);
}

.sidebar-header {
  padding: 24px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.brand-title {
  color: #ffffff;
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.01em;
}

.brand-title svg {
  color: #38bdf8;
}

.brand-subtitle {
  color: var(--text-sidebar);
  font-size: 0.78rem;
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sidebar-search {
  padding: 16px 20px 8px;
}

.search-input-wrapper {
  position: relative;
}

.search-input-wrapper input {
  width: 100%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 10px 14px 10px 38px;
  color: #ffffff;
  font-size: 0.85rem;
  outline: none;
  transition: all var(--transition-fast);
}

.search-input-wrapper input:focus {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-color);
  box-shadow: 0 0 0 2px rgba(6, 182, 212, 0.2);
}

.search-input-wrapper svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-sidebar);
}

/* Sidebar Nav Menu */
.nav-menu {
  flex: 1;
  overflow-y: auto;
  padding: 16px 12px;
}

.nav-section-title {
  font-size: 0.7rem;
  font-weight: 700;
  color: #64748b;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 12px 12px 6px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  color: var(--text-sidebar);
  text-decoration: none;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-bottom: 4px;
}

.nav-item:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: #ffffff;
}

.nav-item.active {
  background-color: rgba(56, 189, 248, 0.15);
  color: #38bdf8;
  font-weight: 600;
  border-left: 3px solid #38bdf8;
}

.nav-item-badge {
  margin-left: auto;
  background: rgba(255, 255, 255, 0.1);
  color: #cbd5e1;
  font-size: 0.72rem;
  padding: 2px 6px;
  border-radius: 12px;
}

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.theme-toggle-btn {
  background: rgba(255, 255, 255, 0.08);
  border: none;
  color: #e2e8f0;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* Main Content Area */
main.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  background-color: var(--bg-body);
}

/* Top Navbar */
.top-header {
  height: 64px;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  z-index: 10;
}

.header-title-wrapper {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  cursor: pointer;
}

.current-module-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-header-action {
  background: var(--primary-light);
  color: var(--primary-color);
  border: none;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.btn-header-action:hover {
  background: var(--primary-hover);
  color: #ffffff;
}

/* Content Container */
.content-body {
  flex: 1;
  overflow-y: auto;
  padding: 32px;
  scroll-behavior: smooth;
}

.module-content-wrapper {
  max-width: 1080px;
  margin: 0 auto;
}

/* Responsive adjustments */
@media (max-width: 992px) {
  aside.sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    transform: translateX(-100%);
  }
  
  aside.sidebar.open {
    transform: translateX(0);
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .content-body {
    padding: 20px 16px;
  }
}

/* ===== RESPONSIVE: Tablet (768px - 992px) ===== */
@media (max-width: 992px) {
  /* sidebar já tratado acima — overlay mode */
  aside.sidebar { width: 300px; }
  .sidebar-header { padding: 20px 16px; }
  .brand-title { font-size: 1.05rem; }
  .brand-subtitle { font-size: 0.7rem; }
  .sidebar-search { padding: 12px 16px 6px; }
  .nav-item { padding: 10px 12px; font-size: 0.82rem; }
  .sidebar-footer { padding: 12px 16px; }
  
  .top-header { 
    height: auto; min-height: 56px; 
    padding: 10px 20px; flex-wrap: wrap; gap: 10px;
  }
  .current-module-title { font-size: 0.95rem; }
  .btn-header-action { font-size: 0.78rem; padding: 6px 12px; }
  
  .content-body { padding: 24px 20px; }
  
  .module-hero { padding: 28px 24px; }
  .module-hero-title { font-size: 1.5rem; }
  .module-hero-description { font-size: 0.9rem; }
  
  .content-section { padding: 24px 20px; }
  .section-title { font-size: 1.15rem; }
  .section-icon { width: 32px; height: 32px; }
  
  .grid-2-cols, .grid-3-cols {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 14px;
  }
  
  .info-card { padding: 16px; }
  .info-card-header { font-size: 0.95rem; }
  
  .flashcard-container { max-width: 440px; height: 280px; }
  .flashcard-front, .flashcard-back { padding: 24px; }
  .flashcard-question { font-size: 1.1rem; }
  .flashcard-answer { font-size: 0.95rem; }
  
  .gallery-grid { grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 12px; }
  .gallery-item img { height: 130px; }
  
  .quiz-card { padding: 20px; }
  .quiz-option { padding: 12px 14px; }
  
  .alert-card { padding: 14px 18px; }
  
  .mnemonic-box { padding: 18px; }
  .mnemonic-letter { width: 28px; height: 28px; font-size: 1rem; }
  
  table.medical-table { font-size: 0.8rem; }
  table.medical-table th, table.medical-table td { padding: 10px 12px; }
}

/* ===== RESPONSIVE: Phone landscape / large phones (600px - 768px) ===== */
@media (max-width: 768px) {
  aside.sidebar { width: 280px; }
  .brand-title { font-size: 1rem; }
  .brand-subtitle { font-size: 0.65rem; }
  
  .top-header { padding: 8px 16px; gap: 8px; }
  .current-module-title { font-size: 0.85rem; max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .btn-header-action { font-size: 0.7rem; padding: 5px 10px; gap: 4px; }
  .header-actions { gap: 6px; }
  
  .content-body { padding: 16px 14px; }
  
  .module-hero { 
    padding: 22px 18px; border-radius: var(--radius-md);
    margin-bottom: 20px;
  }
  .module-hero-tag { font-size: 0.7rem; padding: 3px 10px; }
  .module-hero-title { font-size: 1.3rem; }
  .module-hero-description { font-size: 0.82rem; }
  
  .content-section { 
    padding: 18px 16px; margin-bottom: 16px;
    border-radius: var(--radius-md);
  }
  .section-header { flex-wrap: wrap; gap: 8px; margin-bottom: 14px; padding-bottom: 10px; }
  .section-title { font-size: 1.05rem; }
  .section-icon { width: 28px; height: 28px; font-size: 0.9rem; }
  
  .grid-2-cols, .grid-3-cols {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  
  .info-card { padding: 14px; }
  .info-card-header { font-size: 0.9rem; }
  .info-card p { font-size: 0.85rem; }
  
  .prose { font-size: 0.9rem; line-height: 1.65; }
  .prose p { margin-bottom: 12px; }
  
  .flashcard-container { max-width: 100%; height: 260px; margin: 20px auto; }
  .flashcard-front, .flashcard-back { padding: 20px; }
  .flashcard-category { font-size: 0.68rem; }
  .flashcard-question { font-size: 1rem; }
  .flashcard-answer { font-size: 0.88rem; }
  .flashcard-hint { font-size: 0.7rem; }
  .flashcard-controls { gap: 10px; }
  .btn-card-ctrl { padding: 8px 14px; font-size: 0.8rem; }
  
  .gallery-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 10px; }
  .gallery-item img { height: 110px; }
  .gallery-item-title { font-size: 0.7rem; padding: 6px 8px; }
  
  .quiz-card { padding: 16px; margin: 16px 0; }
  .quiz-option { 
    padding: 10px 12px; margin-bottom: 8px;
    font-size: 0.85rem; gap: 8px;
  }
  .quiz-explanation { padding: 10px 14px; font-size: 0.82rem; }
  
  .alert-card { 
    padding: 12px 14px; margin: 14px 0;
    gap: 10px;
  }
  .alert-icon { font-size: 1.1rem; }
  .alert-content h4 { font-size: 0.88rem; }
  .alert-content p { font-size: 0.82rem; }
  
  .mnemonic-box { padding: 14px; }
  .mnemonic-item { gap: 10px; padding: 8px 0; }
  .mnemonic-letter { width: 26px; height: 26px; font-size: 0.9rem; }
  .mnemonic-desc h5 { font-size: 0.88rem; }
  .mnemonic-desc p { font-size: 0.8rem; }
  
  table.medical-table { font-size: 0.75rem; }
  table.medical-table th, table.medical-table td { padding: 8px 10px; }
  table.medical-table th { font-size: 0.7rem; }
  
  .figure-wrapper { margin: 16px 0; padding: 10px; }
  .figure-caption { font-size: 0.75rem; }
  
  .lightbox-content { padding: 12px; max-width: 95vw; }
  .lightbox-content img { max-width: 85vw; max-height: 70vh; }
  .lightbox-close { top: 6px; right: 10px; font-size: 1.5rem; }
}

/* ===== RESPONSIVE: Small phones (<480px) ===== */
@media (max-width: 480px) {
  aside.sidebar { width: 100%; }
  .sidebar-header { padding: 16px 14px; }
  .sidebar-search { padding: 10px 14px 4px; }
  .search-input-wrapper input { padding: 10px 12px 10px 34px; font-size: 0.8rem; }
  .nav-item { padding: 10px 12px; font-size: 0.8rem; gap: 8px; }
  .nav-section-title { font-size: 0.65rem; padding: 10px 10px 4px; }
  
  .top-header { 
    padding: 8px 12px; gap: 6px; min-height: 50px;
    flex-direction: column; align-items: stretch;
  }
  .header-title-wrapper { gap: 8px; }
  .current-module-title { font-size: 0.8rem; }
  .header-actions { justify-content: flex-start; }
  .btn-header-action { font-size: 0.68rem; padding: 5px 8px; gap: 3px; }
  
  .content-body { padding: 12px 10px; }
  
  .module-hero { 
    padding: 18px 14px; border-radius: var(--radius-sm);
    margin-bottom: 16px;
  }
  .module-hero-tag { font-size: 0.65rem; padding: 2px 8px; margin-bottom: 8px; }
  .module-hero-title { font-size: 1.15rem; }
  .module-hero-description { font-size: 0.78rem; }
  .module-hero::after { display: none; }
  
  .content-section { 
    padding: 14px 12px; margin-bottom: 12px;
    border-radius: var(--radius-sm);
  }
  .section-header { margin-bottom: 10px; padding-bottom: 8px; }
  .section-title { font-size: 0.95rem; }
  .section-icon { width: 26px; height: 26px; }
  
  .grid-2-cols, .grid-3-cols { gap: 10px; }
  .info-card { padding: 12px; }
  .info-card-header { font-size: 0.85rem; }
  .info-card p { font-size: 0.8rem; }
  
  .prose { font-size: 0.85rem; }
  
  .flashcard-container { height: 240px; margin: 16px auto; }
  .flashcard-front, .flashcard-back { padding: 16px; }
  .flashcard-question { font-size: 0.92rem; }
  .flashcard-answer { font-size: 0.82rem; }
  .flashcard-hint { font-size: 0.68rem; }
  .btn-card-ctrl { padding: 7px 12px; font-size: 0.75rem; }
  
  .gallery-grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: 8px; }
  .gallery-item img { height: 90px; }
  .gallery-item-title { font-size: 0.65rem; padding: 4px 6px; }
  
  .quiz-card { padding: 14px; margin: 12px 0; }
  .quiz-option { padding: 8px 10px; font-size: 0.8rem; gap: 6px; }
  .quiz-option span:first-child { font-size: 0.85rem; min-width: 20px; }
  
  .alert-card { padding: 10px 12px; gap: 8px; }
  .alert-icon { font-size: 1rem; }
  .alert-content h4 { font-size: 0.82rem; }
  .alert-content p { font-size: 0.78rem; }
  
  .mnemonic-box { padding: 12px; border-radius: var(--radius-md); }
  .mnemonic-letter { width: 24px; height: 24px; font-size: 0.82rem; }
  .mnemonic-desc h5 { font-size: 0.82rem; }
  
  table.medical-table { font-size: 0.7rem; }
  table.medical-table th, table.medical-table td { padding: 6px 8px; }
  table.medical-table th { font-size: 0.65rem; }
  
  .figure-wrapper { margin: 12px 0; padding: 8px; }
  .figure-caption { font-size: 0.7rem; margin-top: 8px; }
  
  .lightbox-content img { max-width: 92vw; max-height: 65vh; }
  .lightbox-close { font-size: 1.3rem; }
  .lightbox-caption { font-size: 0.75rem; }
  
  .mobile-menu-toggle svg { width: 20px; height: 20px; }
}

/* ===== Touch-friendly improvements ===== */
@media (hover: none) and (pointer: coarse) {
  .nav-item, .quiz-option, .gallery-item, .btn-card-ctrl, .btn-header-action {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
  }
  
  .nav-item { padding: 14px 14px; }
  .quiz-option { padding: 14px 14px; }
  .btn-card-ctrl { padding: 12px 18px; }
  
  .info-card:hover { transform: none; }
  .gallery-item:hover { transform: none; }
}

/* ===== Safe area for notched phones ===== */
@supports (padding: env(safe-area-inset-bottom)) {
  .sidebar-footer {
    padding-bottom: calc(16px + env(safe-area-inset-bottom));
  }
  
  .content-body {
    padding-bottom: calc(32px + env(safe-area-inset-bottom));
  }
}

/* ===== PWA standalone mode tweaks ===== */
@media (display-mode: standalone) {
  body {
    -webkit-user-select: none;
    user-select: none;
    overscroll-behavior: none;
  }
  
  .top-header {
    padding-top: env(safe-area-inset-top);
  }
}