/* ============================================================
   RESET, LOGIN y LAYOUT — compartido por todo el sistema
   Separado de styles.css — el orden de los archivos en index.html
   replica el orden original para conservar la cascada exacta.
   ============================================================ */
/* ===== RESET & BASE ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #64748b;
  --success: #16a34a;
  --success-dark: #15803d;
  --danger: #dc2626;
  --danger-dark: #b91c1c;
  --warning: #f59e0b;
  --warning-dark: #d97706;
  --bg: #f1f5f9;
  --card: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;
  --sidebar-bg: #1e293b;
  --sidebar-text: #cbd5e1;
  --sidebar-active: #2563eb;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ===== LOGIN SCREEN ===== */
.login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
}

.login-box {
  background: white;
  padding: 40px;
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 400px;
  text-align: center;
}

.login-box h1 {
  font-size: 2rem;
  margin-bottom: 8px;
  color: var(--primary);
}

.login-box h2 {
  font-size: 1rem;
  color: var(--text-light);
  margin-bottom: 24px;
  font-weight: normal;
}

.login-hint {
  margin-top: 16px;
  font-size: 0.8rem;
  color: var(--text-light);
}

.login-hint .whatsapp-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #25D366;
  text-decoration: none;
  font-weight: 600;
  transition: opacity 0.2s;
}

.login-hint .whatsapp-link:hover {
  opacity: 0.8;
}

.login-hint .whatsapp-icon {
  flex-shrink: 0;
}

/* Login tabs */
.login-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

.login-tab {
  flex: 1;
  padding: 10px;
  border: 2px solid var(--border);
  background: var(--card);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text-light);
}

.login-tab:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.login-tab.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

.login-panel {
  display: none;
}

.login-panel.active {
  display: block;
}

/* ===== LAYOUT ===== */
.main-screen {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  position: fixed;
  height: 100vh;
  overflow-y: auto;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h2 {
  color: white;
  font-size: 1.2rem;
}

.sidebar-menu {
  list-style: none;
  flex: 1;
  padding: 12px 0;
}

.sidebar-menu li a {
  display: block;
  padding: 12px 20px;
  color: var(--sidebar-text);
  text-decoration: none;
  transition: all 0.2s;
  border-left: 3px solid transparent;
}

.sidebar-menu li a:hover {
  background: rgba(255,255,255,0.05);
  color: white;
}

.sidebar-menu li a.active {
  background: var(--sidebar-active);
  color: white;
  border-left-color: white;
}

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.content {
  flex: 1;
  margin-left: 260px;
  padding: 24px;
  min-height: 100vh;
}

/* ===== MODULES ===== */
.module {
  display: none;
}

.module.active {
  display: block;
}

.module-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.module-header h2 {
  font-size: 1.5rem;
}

.module-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}