:root {
  /* Cores principais - Esmeralda */
  --color-primary: #10b981;
  --color-primary-hover: #059669;
  --color-primary-light: rgba(16, 185, 129, 0.1);
  --color-primary-dark: #047857;
  
  /* Estados */
  --color-success: #10b981;
  --color-danger: #ef4444;
  --color-danger-hover: #dc2626;
  --color-warning: #f59e0b;
  --color-info: #3b82f6;
  
  /* Tema claro */
  --color-bg: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-focus: #10b981;
  
  /* Sombras e bordas */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Fontes */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Transições */
  --transition: 150ms ease;
}

[data-theme="dark"] {
  --color-primary: #34d399;
  --color-primary-hover: #10b981;
  --color-primary-light: rgba(52, 211, 153, 0.1);
  --color-bg: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-bg-tertiary: #334155;
  --color-text: #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #64748b;
  --color-border: #334155;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}

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

.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

/* Botões */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
}

.btn:focus { outline: none; box-shadow: 0 0 0 3px var(--color-primary-light); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-hover); transform: translateY(-1px); }

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

.btn-danger { background: var(--color-danger); color: #fff; }
.btn-danger:hover { background: var(--color-danger-hover); }

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

.btn-sm { padding: 0.375rem 0.75rem; font-size: 0.8125rem; }
.btn-lg { padding: 0.875rem 1.75rem; font-size: 1rem; }

/* Inputs */
.input-group { display: flex; flex-direction: column; gap: 0.5rem; }
.input-group label { font-size: 0.875rem; font-weight: 500; }

.input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.9375rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: border var(--transition), box-shadow var(--transition);
}

.input:focus { outline: none; border-color: var(--color-border-focus); box-shadow: 0 0 0 3px var(--color-primary-light); }
.input::placeholder { color: var(--color-text-muted); }
textarea.input { resize: vertical; min-height: 120px; }

.input-error-text {
  color: var(--color-danger);
  font-size: 0.75rem;
  margin-top: 0.25rem;
  display: block;
  min-height: 1rem;
}

.input.error {
  border-color: var(--color-danger);
}

.input.error:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

/* Cards */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card-header { padding: 1.25rem 1.5rem; border-bottom: 1px solid var(--color-border); background: var(--color-bg-secondary); }
.card-body { padding: 1.5rem; }
.card-footer { padding: 1rem 1.5rem; border-top: 1px solid var(--color-border); background: var(--color-bg-secondary); }

/* Header */
.header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content { display: flex; align-items: center; justify-content: space-between; }

.logo { display: flex; align-items: center; gap: 0.75rem; font-size: 1.375rem; font-weight: 700; color: var(--color-primary); }
.logo img { width: 2rem; height: 2rem; }

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

/* Theme Toggle */
.theme-toggle {
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  font-size: 1.125rem;
  cursor: pointer;
  transition: all var(--transition);
}

.theme-toggle:hover { background: var(--color-bg-tertiary); }

/* Alertas */
.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

.alert-success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
[data-theme="dark"] .alert-success { background: #064e3b; color: #a7f3d0; border-color: #065f46; }
[data-theme="dark"] .alert-error { background: #450a0a; color: #fecaca; border-color: #991b1b; }

/* Loading */
.spinner {
  width: 1.25rem;
  height: 1.25rem;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.loading-content {
  background: var(--color-bg);
  padding: 2rem 3rem;
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.loading-content .spinner { width: 2.5rem; height: 2.5rem; border-width: 3px; }

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.modal {
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 28rem;
  max-height: 90vh;
  overflow: auto;
}

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

.modal-title { font-size: 1.125rem; font-weight: 600; }

.modal-close {
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.5rem;
  color: var(--color-text-secondary);
}

.modal-close:hover { background: var(--color-bg-secondary); }

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

/* Badge */
.badge {
  display: inline-flex;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 9999px;
}

.badge-primary { background: var(--color-primary-light); color: var(--color-primary-dark); }
.badge-success { background: #ecfdf5; color: #065f46; }
.badge-danger { background: #fef2f2; color: #991b1b; }
[data-theme="dark"] .badge-success { background: #064e3b; color: #6ee7b7; }
[data-theme="dark"] .badge-danger { background: #450a0a; color: #fca5a5; }

/* Table */
.table-container { overflow-x: auto; border-radius: var(--radius-lg); border: 1px solid var(--color-border); }
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { padding: 1rem 1.25rem; text-align: left; }
.table th { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-text-secondary); background: var(--color-bg-secondary); border-bottom: 1px solid var(--color-border); }
.table td { border-bottom: 1px solid var(--color-border); }
.table tbody tr:last-child td { border-bottom: none; }
.table tbody tr:hover td { background: var(--color-bg-secondary); }

/* Files */
.file-list { display: flex; flex-direction: column; gap: 0.5rem; }

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 1rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.file-item:hover { border-color: var(--color-primary); }

.file-info { display: flex; align-items: center; gap: 0.875rem; }

.file-icon {
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  font-size: 1rem;
}

.file-name { font-size: 0.875rem; font-weight: 500; }
.file-size { font-size: 0.75rem; color: var(--color-text-muted); margin-top: 0.125rem; }
.file-actions { display: flex; gap: 0.5rem; }

/* Drop Zone */
.drop-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--color-bg-secondary);
}

.drop-zone:hover, .drop-zone.dragover { border-color: var(--color-primary); background: var(--color-primary-light); }
.drop-zone-icon { font-size: 2.5rem; margin-bottom: 0.75rem; }
.drop-zone-text { color: var(--color-text-secondary); }

/* PIN */
.pin-display {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  padding: 1rem 1.5rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
  color: var(--color-primary);
}

.pin-input { font-family: var(--font-mono); font-size: 1.5rem; letter-spacing: 0.3em; text-align: center; text-transform: uppercase; }

/* Editor */
.editor {
  width: 100%;
  min-height: 400px;
  padding: 1.25rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.8;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  resize: vertical;
}

.editor:focus { outline: none; border-color: var(--color-border-focus); box-shadow: 0 0 0 3px var(--color-primary-light); }

/* Status */
.status-indicator { display: inline-flex; align-items: center; gap: 0.5rem; font-size: 0.8125rem; color: var(--color-text-muted); }
.status-dot { width: 0.5rem; height: 0.5rem; border-radius: 50%; background: var(--color-text-muted); }
.status-dot.online { background: var(--color-success); animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }

.user-count {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.75rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 9999px;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

/* Utilities */
.hidden { display: none !important; }
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.font-mono { font-family: var(--font-mono); }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }

/* Responsive */
@media (max-width: 768px) {
  .container { padding: 0 1rem; }
  .card-body, .card-header { padding: 1rem; }
  .pin-display { font-size: 1.25rem; letter-spacing: 0.2em; }
}

/* ===== File Viewer ===== */
.viewer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 2000;
  display: flex;
  flex-direction: column;
}

.viewer-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 100%;
}

.viewer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
  gap: 1rem;
  flex-wrap: wrap;
}

.viewer-title-area {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-width: 0;
}

.viewer-filename {
  font-weight: 600;
  font-size: 0.9375rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 300px;
}

.viewer-pageinfo {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.viewer-toolbar {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  flex-shrink: 0;
}

.viewer-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  padding: 0.4rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.viewer-btn:hover {
  background: var(--color-bg-tertiary);
}

.viewer-btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

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

.viewer-btn-close {
  background: var(--color-danger);
  color: #fff;
  border-color: var(--color-danger);
  font-weight: 700;
}

.viewer-btn-close:hover {
  background: var(--color-danger-hover);
}

.viewer-zoom-level {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  min-width: 3rem;
  text-align: center;
}

.viewer-separator {
  width: 1px;
  height: 1.25rem;
  background: var(--color-border);
  margin: 0 0.25rem;
}

.viewer-content {
  flex: 1;
  overflow: auto;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 1.5rem;
}

/* Loading */
.viewer-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  color: #fff;
  padding: 3rem;
}

.viewer-loading .spinner {
  width: 2.5rem;
  height: 2.5rem;
  border-width: 3px;
  border-color: rgba(255,255,255,0.2);
  border-top-color: var(--color-primary);
}

/* PDF container */
.viewer-pdf-container {
  position: relative;
  display: inline-block;
}

.viewer-pdf-container canvas {
  display: block;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.viewer-spreadsheet-warning {
  background: rgba(234, 179, 8, 0.15);
  border: 1px solid rgba(234, 179, 8, 0.4);
  color: #ca8a04;
  padding: 0.625rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  text-align: center;
  margin-bottom: 1rem;
  max-width: 600px;
}

/* Video & Audio containers */
.viewer-media-container {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.viewer-video {
  max-width: 100%;
  max-height: calc(100vh - 120px);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  background: #000;
  outline: none;
}

.viewer-audio-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  padding: 3rem;
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  min-width: 320px;
  max-width: 500px;
}

.viewer-audio-icon {
  font-size: 4rem;
}

.viewer-audio-title {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  text-align: center;
  word-break: break-all;
}

.viewer-audio {
  width: 100%;
  outline: none;
}

/* Image container */
.viewer-image-container {
  display: flex;
  align-items: center;
  justify-content: center;
}

.viewer-image {
  max-width: 100%;
  max-height: calc(100vh - 120px);
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

/* Text container */
.viewer-text-container {
  width: 100%;
  max-width: 900px;
}

.viewer-text-content {
  background: var(--color-bg);
  color: var(--color-text);
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  overflow-x: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  max-height: calc(100vh - 180px);
  overflow-y: auto;
}

.viewer-copy-btn {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
  cursor: pointer;
  margin-bottom: 0.75rem;
  transition: all var(--transition);
}

.viewer-copy-btn:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* Error */
.viewer-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  color: #fff;
  padding: 3rem;
  text-align: center;
}

.viewer-error p {
  font-size: 1rem;
}

/* Responsive viewer */
@media (max-width: 768px) {
  .viewer-header {
    padding: 0.5rem 0.75rem;
  }

  .viewer-filename {
    max-width: 150px;
    font-size: 0.8125rem;
  }

  .viewer-toolbar {
    gap: 0.25rem;
  }

  .viewer-btn {
    padding: 0.35rem 0.5rem;
    font-size: 0.75rem;
  }

  .viewer-content {
    padding: 0.75rem;
  }

  .viewer-zoom-level {
    display: none;
  }

  .viewer-separator {
    display: none;
  }
}