/* ======================================================
   DESIGN TOKENS - LIGHT MODE (DEFAULT)
====================================================== */
:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: rgba(37, 99, 235, 0.1);
  --color-accent: #ec4899;
  --color-accent-hover: #db2777;

  --color-sidebar-bg: #1e293b;
  --color-sidebar-text: #f8fafc;
  --color-sidebar-muted: #94a3b8;

  --color-bg: #f1f5f9;
  --color-card: #ffffff;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;

  --color-text-primary: #0f172a;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;

  --color-success: #16a34a;
  --color-success-bg: #dcfce7;
  --color-warning: #f59e0b;
  --color-warning-bg: #fef3c7;
  --color-danger: #dc2626;
  --color-danger-bg: #fee2e2;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -1px rgba(0,0,0,.04);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.08), 0 4px 6px -2px rgba(0,0,0,.04);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,.1), 0 10px 10px -5px rgba(0,0,0,.04);

  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 300ms ease;
}

/* ======================================================
   DARK MODE
====================================================== */
body.dark-mode {
  --color-bg: #0f172a;
  --color-card: #1e293b;
  --color-border: #334155;
  --color-border-light: #1e293b;

  --color-text-primary: #f8fafc;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;

  --color-success-bg: rgba(34, 197, 94, 0.15);
  --color-warning-bg: rgba(245, 158, 11, 0.15);
  --color-danger-bg: rgba(239, 68, 68, 0.15);
  --color-primary-light: rgba(37, 99, 235, 0.15);

  --shadow-sm: 0 1px 3px rgba(0,0,0,.2), 0 1px 2px rgba(0,0,0,.15);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.25), 0 2px 4px -1px rgba(0,0,0,.15);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.3), 0 4px 6px -2px rgba(0,0,0,.15);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,.4), 0 10px 10px -5px rgba(0,0,0,.2);
}

body.dark-mode .top-bar {
  background: var(--color-card);
  border-color: var(--color-border);
}

body.dark-mode .modal-card {
  background: var(--color-card);
  color: var(--color-text-primary);
}

body.dark-mode input,
body.dark-mode select,
body.dark-mode textarea {
  background: #0f172a !important;
  color: #f1f5f9 !important;
  border-color: var(--color-border);
}

body.dark-mode input[readonly] {
  background: #1e293b !important;
  color: #94a3b8 !important;
  cursor: default;
}

body.dark-mode select option {
  background: #1e293b;
  color: #f1f5f9;
}

body.dark-mode input::placeholder,
body.dark-mode textarea::placeholder {
  color: var(--color-text-muted);
}

body.dark-mode .btn-secondary {
  background: #334155;
  color: var(--color-text-primary);
  border-color: var(--color-border);
}

body.dark-mode .btn-secondary:hover {
  background: #475569;
}

body.dark-mode .aluno-header,
body.dark-mode .aluno-footer,
body.dark-mode .aluno-info-row.aluno-info-highlight {
  background: rgba(0,0,0,0.2);
}

body.dark-mode .modal-btn-secondary {
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

body.dark-mode .modal-btn-secondary:hover {
  background: rgba(255,255,255,0.05);
}

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

html {
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--color-bg);
  color: var(--color-text-primary);
  height: 100vh;
  overflow: hidden;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ======================================================
   LAYOUT
====================================================== */
#app {
  display: flex;
  height: 100%;
}

/* ======================================================
   SIDEBAR
====================================================== */
#sidebar {
  width: 260px;
  background: linear-gradient(180deg, #1e293b, #0f172a);
  color: var(--color-sidebar-text);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.brand {
  padding: 1.5rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.sidebar-logo {
  width: 100%;
  max-width: 180px;
  height: auto;
  filter: invert(1);
}

.brand h2 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

#menu {
  list-style: none;
  padding: 0.75rem 0;
  flex: 1;
  overflow-y: auto;
}

.menu-item {
  padding: 0.75rem 1.5rem;
  cursor: pointer;
  color: var(--color-sidebar-muted);
  font-size: 0.9rem;
  font-weight: 450;
  transition: background var(--transition-fast), color var(--transition-fast);
  border-left: 3px solid transparent;
  user-select: none;
}

.menu-item:hover {
  background: rgba(255,255,255,.05);
  color: #fff;
}

.menu-item:active {
  background: rgba(255,255,255,.08);
}

.menu-item.active {
  background: var(--color-primary);
  color: #fff;
  border-left-color: rgba(255,255,255,0.3);
}

/* ======================================================
   MAIN CONTENT
====================================================== */
#main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.top-bar {
  background: var(--color-card);
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-shrink: 0;
}

#page-title {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.user-profile {
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

#content-area {
  flex: 1;
  padding: 1.5rem;
  overflow-y: auto;
  overflow-x: hidden;
}

/* ======================================================
   SCROLLBAR STYLING
====================================================== */
#content-area::-webkit-scrollbar,
#menu::-webkit-scrollbar {
  width: 6px;
}

#content-area::-webkit-scrollbar-track,
#menu::-webkit-scrollbar-track {
  background: transparent;
}

#content-area::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

#menu::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.1);
  border-radius: 3px;
}

#content-area::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

/* ======================================================
   DASHBOARD
====================================================== */
.dashboard-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.summary-card {
  background: var(--color-card);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
  min-width: 280px;
}

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

.card-title {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.card-value {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

/* ======================================================
   EMPTY STATE
====================================================== */
.empty-state {
  min-height: 300px;
  background: var(--color-card);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: var(--color-text-secondary);
  text-align: center;
  padding: 2rem;
}

.empty-state h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

.empty-state p {
  font-size: 0.9rem;
  max-width: 280px;
  line-height: 1.5;
}

/* ======================================================
   BUTTONS - GLOBAL
====================================================== */
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.6rem 1.1rem;
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  white-space: nowrap;
}

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

.btn-primary:active {
  transform: translateY(1px);
}

.btn-primary:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

.btn-secondary {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 1.1rem;
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  color: var(--color-text-primary);
  transition: background var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}

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

.btn-secondary:active {
  transform: translateY(1px);
}

.btn-secondary:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn-sm {
  padding: 0.4rem 0.7rem;
  font-size: 0.8rem;
}

.btn-muted {
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.9rem;
  cursor: pointer;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  font-weight: 450;
  transition: all var(--transition-fast);
}

.btn-muted:hover {
  background: var(--color-border);
  color: var(--color-text-primary);
}

/* ======================================================
   MODAL
====================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15,23,42,.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
  animation: fadeIn 150ms ease;
}

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

@keyframes slideUp {
  from { 
    opacity: 0; 
    transform: translateY(10px) scale(0.98); 
  }
  to { 
    opacity: 1; 
    transform: translateY(0) scale(1); 
  }
}

.modal-card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  width: 520px;
  max-width: 100%;
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  animation: slideUp 200ms ease;
}

.modal-card::-webkit-scrollbar {
  width: 6px;
}

.modal-card::-webkit-scrollbar-track {
  background: transparent;
}

.modal-card::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

/* Container para selecao de turmas */
.turmas-select-container {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  max-height: 180px;
  overflow-y: auto;
  background: var(--color-input);
}

.turmas-select-container::-webkit-scrollbar {
  width: 6px;
}

.turmas-select-container::-webkit-scrollbar-track {
  background: transparent;
}

.turmas-select-container::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

.turma-checkbox-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.25rem;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-primary);
}

.turma-checkbox-item:last-child {
  border-bottom: none;
}

.turma-checkbox-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--color-primary);
}

.turma-checkbox-item label {
  cursor: pointer;
  flex: 1;
  font-size: 0.95rem;
}

.turma-checkbox-item .turma-unidade {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
}

/* ======================================================
   MODAL FORM
====================================================== */
.modal-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.field label {
  font-size: 0.825rem;
  font-weight: 500;
  color: var(--color-text-primary);
}

.field small {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.field input,
.field select,
.field textarea {
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--color-text-primary);
  background: var(--color-card);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.field input::placeholder,
.field textarea::placeholder {
  color: var(--color-text-muted);
}

.field input:hover,
.field select:hover,
.field textarea:hover {
  border-color: var(--color-text-muted);
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.field select {
  cursor: pointer;
}

.field select option {
  background: #ffffff;
  color: #1e293b;
}

body.dark-mode .field select option {
  background: #1e293b;
  color: #f1f5f9;
}

.field textarea {
  resize: vertical;
  min-height: 80px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border);
}

/* ======================================================
   MODAL BUTTONS
====================================================== */
.modal-btn-primary {
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.6rem 1.25rem;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.modal-btn-primary:hover {
  background: var(--color-accent-hover);
}

.modal-btn-primary:active {
  transform: translateY(1px);
}

.modal-btn-primary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.modal-btn-secondary {
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 1.1rem;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

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

.modal-btn-secondary:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ======================================================
   CHARTS - FIXED HEIGHT
====================================================== */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.chart-card {
  padding: 1.25rem;
}

.chart-title {
  margin: 0 0 0.75rem 0;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.chart-wrapper {
  position: relative;
  height: 200px;
  width: 100%;
}

.chart-wrapper canvas {
  max-height: 100%;
  max-width: 100%;
}

/* ======================================================
   STUDENT CARD - PROFESSIONAL LAYOUT
====================================================== */
.aluno-card {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: 0;
  overflow: hidden;
}

.aluno-card.aluno-pendente {
  border-left: 3px solid var(--color-warning);
}

.aluno-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 1rem 1.25rem;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.aluno-nome {
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
  color: var(--color-text-primary);
  line-height: 1.3;
  flex: 1 0 auto;
  min-width: 120px;
}

.aluno-badges {
  display: flex;
  gap: 0.3rem;
  flex-wrap: wrap;
  justify-content: flex-start;
  margin-left: auto;
}

/* ======================================================
   BADGES
====================================================== */
.badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  white-space: nowrap;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.badge-success {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.badge-warning {
  background: var(--color-warning-bg);
  color: #b45309;
}

.badge-info {
  background: #dbeafe;
  color: #1d4ed8;
}

.badge-danger {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

.badge-muted {
  background: var(--color-border-light);
  color: var(--color-text-secondary);
}

body.dark-mode .badge-success {
  color: #4ade80;
}

body.dark-mode .badge-warning {
  color: #fbbf24;
}

body.dark-mode .badge-info {
  background: rgba(59, 130, 246, 0.2);
  color: #60a5fa;
}

body.dark-mode .badge-danger {
  color: #f87171;
}

body.dark-mode .badge-muted {
  background: rgba(100, 116, 139, 0.2);
  color: #94a3b8;
}

/* ======================================================
   STUDENT CARD BODY
====================================================== */
.aluno-body {
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}

.aluno-info-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.4;
}

.aluno-info-row.aluno-info-primary {
  color: var(--color-text-primary);
  font-weight: 500;
}

.aluno-info-row.aluno-info-highlight {
  background: var(--color-bg);
  margin: 0.25rem -1.25rem;
  padding: 0.5rem 1.25rem;
}

.aluno-info-row.aluno-info-secondary {
  font-size: 0.8rem;
}

.info-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  background: var(--color-border);
  border-radius: 4px;
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

/* ======================================================
   STUDENT CARD FOOTER
====================================================== */
.aluno-footer {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem 1rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.aluno-actions-primary,
.aluno-actions-secondary {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.aluno-actions-secondary {
  padding-top: 0.5rem;
  border-top: 1px solid var(--color-border);
}

/* ======================================================
   MOBILE SIDEBAR TOGGLE
====================================================== */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 200;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  width: 40px;
  height: 40px;
  cursor: pointer;
  font-size: 1.25rem;
  font-weight: 600;
  box-shadow: var(--shadow-md);
  transition: background var(--transition-fast);
}

.sidebar-toggle:hover {
  background: var(--color-primary-hover);
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 99;
}

/* ======================================================
   THEME TOGGLE
====================================================== */
#theme-toggle {
  padding: 1rem 1.5rem;
  border-top: 1px solid rgba(255,255,255,.08);
  cursor: pointer;
  color: var(--color-sidebar-muted);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: color var(--transition-fast), background var(--transition-fast);
  user-select: none;
}

#theme-toggle:hover {
  color: #fff;
  background: rgba(255,255,255,.05);
}

/* ======================================================
   ALERTS & NOTIFICATIONS
====================================================== */
.alert-card {
  background: var(--color-warning-bg);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
}

.alert-card-danger {
  background: var(--color-danger-bg);
  border-color: rgba(220, 38, 38, 0.3);
}

.alert-card-success {
  background: var(--color-success-bg);
  border-color: rgba(22, 163, 74, 0.3);
}

/* ======================================================
   TABLES (for reports)
====================================================== */
table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background: var(--color-bg);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-text-secondary);
}

td {
  font-size: 0.9rem;
}

tbody tr:hover {
  background: var(--color-bg);
}

/* ======================================================
   UTILITY CLASSES
====================================================== */
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-danger { color: var(--color-danger); }
.text-muted { color: var(--color-text-muted); }

.bg-success { background: var(--color-success-bg); }
.bg-warning { background: var(--color-warning-bg); }
.bg-danger { background: var(--color-danger-bg); }

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

/* ======================================================
   RESPONSIVE - TABLET (<1024px)
====================================================== */
@media (max-width: 1024px) {
  #content-area {
    padding: 1.25rem;
  }
  
  .dashboard-cards {
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 0.875rem;
  }
  
  .summary-card {
    padding: 1rem;
  }
  
  .modal-grid {
    grid-template-columns: 1fr;
  }
  
  .charts-grid {
    grid-template-columns: 1fr;
  }
  
  .card-value {
    font-size: 1.5rem;
  }
}

/* ======================================================
   RESPONSIVE - MOBILE (<768px)
====================================================== */
@media (max-width: 768px) {
  .sidebar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .sidebar-overlay.active {
    display: block;
  }
  
  #sidebar {
    position: fixed;
    left: -280px;
    top: 0;
    height: 100%;
    z-index: 100;
    transition: left var(--transition-slow);
    box-shadow: var(--shadow-xl);
  }
  
  #sidebar.open {
    left: 0;
  }
  
  #main-content {
    width: 100%;
  }
  
  .top-bar {
    padding: 0.875rem 1rem;
    padding-left: 3.5rem;
  }
  
  #page-title {
    font-size: 1.25rem;
  }
  
  #content-area {
    padding: 1rem;
  }
  
  .dashboard-cards {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }
  
  .summary-card {
    padding: 0.875rem;
  }
  
  .card-title {
    font-size: 0.7rem;
  }
  
  .card-value {
    font-size: 1.35rem;
  }
  
  .modal-card {
    padding: 1.25rem;
    border-radius: var(--radius-md);
  }
  
  .modal-title {
    font-size: 1.1rem;
  }
  
  .modal-actions {
    flex-direction: column-reverse;
    gap: 0.5rem;
  }
  
  .modal-actions button {
    width: 100%;
    justify-content: center;
  }
  
  .aluno-footer {
    flex-direction: column;
  }
  
  .aluno-actions-primary,
  .aluno-actions-secondary {
    width: 100%;
  }
  
  .aluno-actions-primary button,
  .aluno-actions-secondary button {
    flex: 1;
    min-width: 0;
    text-align: center;
  }
  
  .chart-wrapper {
    height: 180px;
  }
  
  .charts-grid {
    gap: 0.875rem;
  }
  
  .btn-primary,
  .btn-secondary,
  .btn-muted {
    padding: 0.55rem 0.9rem;
    font-size: 0.825rem;
  }
}

/* ======================================================
   RESPONSIVE - SMALL MOBILE (<480px)
====================================================== */
@media (max-width: 480px) {
  .dashboard-cards {
    grid-template-columns: 1fr;
  }
  
  .top-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
  }
  
  .user-profile {
    font-size: 0.8rem;
  }
  
  .brand {
    padding: 1rem;
  }
  
  .brand h2 {
    font-size: 1.1rem;
  }
  
  .menu-item {
    padding: 0.7rem 1.25rem;
    font-size: 0.875rem;
  }
  
  .aluno-header {
    padding: 0.875rem 1rem;
    gap: 0.5rem;
  }
  
  .aluno-nome {
    flex: 0 0 100%;
    width: 100%;
    min-width: 0;
  }
  
  .aluno-badges {
    justify-content: flex-start;
    margin-left: 0;
  }
  
  .aluno-body {
    padding: 0.875rem 1rem;
  }
  
  .aluno-footer {
    padding: 0.75rem 1rem;
  }
  
  .aluno-info-row.aluno-info-highlight {
    margin: 0.25rem -1rem;
    padding: 0.5rem 1rem;
  }
  
  .chart-wrapper {
    height: 160px;
  }
  
  .modal-grid {
    gap: 0.875rem;
  }
  
  .field input,
  .field select,
  .field textarea {
    padding: 0.55rem 0.65rem;
    font-size: 0.875rem;
  }
}

/* ======================================================
   WELCOME / LOGIN SCREEN
====================================================== */
.welcome-screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  overflow: hidden;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

.welcome-background {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background-image: url('./logo-original.png');
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.08;
}

.welcome-overlay {
  position: absolute;
  inset: 0;
  background: transparent;
}

.welcome-container {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2.5rem;
  max-width: 420px;
  width: 90%;
  background: rgba(15, 23, 42, 0.6);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}


.welcome-title {
  font-size: 1.6rem;
  font-weight: 600;
  color: #f8fafc;
  margin: 0 0 0.5rem 0;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.welcome-subtitle {
  font-size: 1.25rem;
  color: #e2b866;
  font-weight: 500;
  margin: 0 0 2rem 0;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.login-form {
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.login-form .field {
  margin-bottom: 1rem;
  text-align: left;
}

.login-form .field label {
  color: #f8fafc;
}

.login-form .field input {
  background: #0f172a;
  color: #f8fafc;
  border-color: #334155;
}

.login-form .field input::placeholder {
  color: #64748b;
}

.login-error {
  background: var(--color-danger-bg);
  color: var(--color-danger);
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  font-size: 0.875rem;
}

.btn-full {
  width: 100%;
}

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: 1.1rem;
}

.user-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* ======================================================
   MANUAL DE USO
====================================================== */
.manual-container {
  max-width: 100%;
}

.manual-section {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.manual-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.manual-section h3 {
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 1rem 0;
}

.manual-section h4 {
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 600;
  margin: 1.25rem 0 0.5rem 0;
}

.manual-section p {
  color: var(--text-primary);
  line-height: 1.6;
  margin: 0.5rem 0;
}

.manual-section ul,
.manual-section ol {
  color: var(--text-primary);
  margin: 0.5rem 0;
  padding-left: 1.5rem;
  line-height: 1.8;
}

.manual-section li {
  margin-bottom: 0.25rem;
}

.manual-section strong {
  color: var(--text-primary);
}

/* ======================================================
   PRINT STYLES
====================================================== */
@media print {
  #sidebar,
  .sidebar-toggle,
  .sidebar-overlay,
  .btn-primary,
  .btn-secondary,
  .btn-muted,
  .aluno-footer {
    display: none !important;
  }
  
  #main-content {
    width: 100%;
  }
  
  .summary-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ddd;
  }
}