/* ============================================================================
   ESTILOS UNIFICADOS - ACADEMIA DE PINTURA
   Autor: Sistema Unificado CSS
   Descripción: Hoja de estilos consolidada para todo el proyecto
   ============================================================================ */

/* ============================================================================
   VARIABLES CSS
   ============================================================================ */
:root {
    /* Colores principales */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-dark: #764ba2;
    
    /* Colores de estado */
    --error-bg: #ffebee;
    --error-border: #d32f2f;
    --error-text: #c62828;
    
    --success-bg: #e8f5e9;
    --success-border: #4caf50;
    --success-text: #2e7d32;
    
    --info-bg: #e3f2fd;
    --info-border: #2196f3;
    --info-text: #1565c0;
    
    /* Colores neutros */
    --bg-light: #f5f5f5;
    --bg-gray: #f4f4f4;
    --text-primary: #333;
    --text-secondary: #666;
    --text-light: #555;
    --border-color: #ddd;
    --border-light: #eee;
    
    /* Sombras */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 10px 40px rgba(0, 0, 0, 0.2);
    
    /* Bordes */
    --border-radius-sm: 4px;
    --border-radius-md: 5px;
    --border-radius-lg: 10px;
    --border-radius-xl: 15px;
    
    /* Espaciado */
    --spacing-xs: 5px;
    --spacing-sm: 10px;
    --spacing-md: 15px;
    --spacing-lg: 20px;
    --spacing-xl: 30px;
    --spacing-xxl: 40px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, #e0e7ff 0%, #f5f5fa 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* ============================================================================
   LAYOUTS - PÁGINAS ESPECIALES
   ============================================================================ */

/* Layout centrado con gradiente (Login, Registro, Index) */
body.centered-layout {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: var(--primary-gradient);
    margin: 0;
    padding: 0;
}

/* Layout centrado con flexbox vertical (Index) */
body.flex-layout {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: var(--primary-gradient);
    margin: 0;
    padding: 0;
}

/* Layout con fondo gris (Panel) */
body.panel-layout {
    background: var(--bg-light);
}

/* ============================================================================
   CONTENEDORES
   ============================================================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 70vh;
    background: rgba(255,255,255,0.95);
    border-radius: 18px;
    box-shadow: 0 8px 32px rgba(102,126,234,0.10), 0 1.5px 8px rgba(118,75,162,0.08);
    padding: 40px 30px 30px 30px;
    margin: 40px 0;
    width: 100%;
}

.container.panel-container {
    margin: var(--spacing-xl) auto;
}

/* ============================================================================
   CAJAS DE CONTENIDO
   ============================================================================ */

/* Caja genérica blanca con sombra */
.white-box {
    background: white;
    padding: var(--spacing-xxl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

/* Contenedor de login */
.login-container {
    background: white;
    padding: var(--spacing-xxl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
}

.login-container h1 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
}

/* Contenedor de registro */
.registro-container {
    background: white;
    padding: var(--spacing-xxl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 500px;
}

.registro-container h1 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
}

/* Contenedor de bienvenida (Index) */
.content-box {
    background: white;
    padding: 60px var(--spacing-xxl);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
    text-align: center;
    max-width: 600px;
    width: 100%;
}

.content-box h2 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    font-size: 32px;
}

.content-box p {
    color: var(--text-secondary);
    font-size: 18px;
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

/* Caja de bienvenida (Panel) */
.welcome {
    background: rgba(255,255,255,0.98);
    border-radius: 16px;
    box-shadow: 0 4px 18px rgba(102,126,234,0.10);
    padding: 32px 24px;
    margin-bottom: 0;
    width: 100%;
    text-align: center;
}

.welcome h2 {
    font-size: 2.2rem;
    color: var(--primary-dark);
    margin-bottom: 18px;
}

.welcome p, .welcome label, .welcome select, .welcome form, .welcome table {
    font-size: 1.1rem;
}

/* ============================================================================
   NAVEGACIÓN
   ============================================================================ */
.navbar {
    background: var(--primary-gradient);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.navbar.transparent {
    background: rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    padding: var(--spacing-lg) var(--spacing-xxl);
}

.navbar h1 {
    font-size: 24px;
    margin: 0;
}

.navbar h1.large {
    font-size: 28px;
}

.navbar a {
    color: white;
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-md);
    transition: background 0.3s;
}

.navbar a:hover {
    background: rgba(255, 255, 255, 0.3);
}

.navbar-links a {
    color: white;
    text-decoration: none;
    margin-left: var(--spacing-lg);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    background: rgba(255, 255, 255, 0.2);
    transition: background 0.3s;
}

.navbar-links a:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ============================================================================
   FORMULARIOS
   ============================================================================ */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-light);
    font-weight: bold;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-sizing: border-box;
    font-size: 16px;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 5px rgba(102, 126, 234, 0.5);
}

/* Layout de formulario en dos columnas */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

/* ============================================================================
   BOTONES
   ============================================================================ */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-danger {
    background: #dc3545;
    color: white;
}

.btn-danger:hover {
    background: #c82333;
}

/* Botones especiales para formularios */
.login-btn,
.registro-btn {
    width: 100%;
    padding: 12px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--border-radius-md);
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s;
}

.login-btn:hover,
.registro-btn:hover {
    transform: translateY(-2px);
}

/* Grupos de botones */
.btn-group {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

.btn-group .btn {
    padding: var(--spacing-md) var(--spacing-xxl);
    font-size: 18px;
}

.btn-group .btn-secondary {
    background: #f0f0f0;
    color: var(--text-primary);
    border: 2px solid var(--primary-color);
}

.btn-group .btn-secondary:hover {
    transform: translateY(-2px);
    background: var(--primary-color);
    color: white;
}

/* Botones pequeños (tablas) */
.small-btn {
    padding: 6px var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    display: inline-block;
    font-size: 14px;
}

.small-btn.danger {
    background: var(--error-border);
}

.small-btn:hover {
    opacity: 0.9;
}

/* ============================================================================
   MENSAJES Y ALERTAS
   ============================================================================ */
.alert {
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    border-radius: var(--border-radius-sm);
    border-left: 4px solid;
}

.alert-error,
.error-msg {
    color: var(--error-text);
    background: var(--error-bg);
    padding: 12px;
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--error-border);
    display: none;
}

.alert-success,
.success-msg {
    color: var(--success-text);
    background: var(--success-bg);
    padding: 12px;
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--success-border);
    display: none;
}

.alert-info {
    background: var(--info-bg);
    border-color: var(--info-border);
    color: var(--info-text);
}

/* ============================================================================
   TABLAS
   ============================================================================ */
table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    box-shadow: var(--shadow-sm);
    margin: var(--spacing-lg) 0;
    border-radius: 12px;
    overflow: hidden;
}

table th,
table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

table th {
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    font-size: 1.08em;
}

table td {
    background: rgba(255,255,255,0.95);
}

table tr:hover {
    background: var(--bg-light);
}

/* Tabla de usuarios específica */
table.users {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-md);
}

table.users th,
table.users td {
    padding: 8px var(--spacing-sm);
    border-bottom: 1px solid var(--border-light);
    text-align: left;
}

.actions a,
.actions form {
    display: inline-block;
    margin-right: 8px;
}

/* ============================================================================
   DROPDOWNS / DESPLEGABLES (PANEL)
   ============================================================================ */
.dropdown details {
    margin-top: var(--spacing-sm);
}

.dropdown summary {
    cursor: pointer;
    padding: 12px var(--spacing-md);
    background: linear-gradient(90deg, #f3f4f6, #ffffff);
    border-radius: 8px;
    list-style: none;
    font-weight: 600;
    color: var(--text-primary);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    outline: none;
}

.dropdown summary:hover {
    background: linear-gradient(90deg, #e5e7eb, #f9fafb);
}

.dropdown details[open] summary {
    background: var(--primary-gradient);
    color: white;
}

.dropdown ul {
    margin: var(--spacing-sm) 0 0 0;
    padding-left: 18px;
}

.dropdown ul li {
    margin: 8px 0;
}

.dropdown a {
    color: #4a6cf7;
    text-decoration: none;
}

.dropdown a:hover {
    text-decoration: underline;
}

/* ============================================================================
   MODALES
   ============================================================================ */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
}

.modal-content {
    background-color: #fefefe;
    margin: 10% auto;
    padding: var(--spacing-lg);
    border: 1px solid #888;
    border-radius: var(--border-radius-sm);
    width: 90%;
    max-width: 500px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-md);
}

.modal-header h2 {
    margin: 0;
}

.close {
    font-size: 28px;
    font-weight: bold;
    color: #aaa;
    cursor: pointer;
}

.close:hover {
    color: #000;
}

/* === MODALES DE CONFIRMACIÓN Y OVERLAYS (borrar_usuario.php) === */
.confirm-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(15,15,15,0.0);
    z-index: 9999;
    padding: 20px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 260ms ease-in-out;
}
.confirm-overlay.show { opacity: 1; background: rgba(15,15,15,0.5); pointer-events: auto; }
.confirm-overlay.hide { opacity: 0; pointer-events: none; }

.confirm-modal {
    width: 100%;
    max-width: 640px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.18);
    padding: 20px 22px;
    transform: scale(0.98);
    opacity: 0;
    transition: transform 260ms cubic-bezier(.2,.9,.2,1), opacity 240ms ease-in-out;
}
.confirm-modal.show { transform: scale(1); opacity: 1; }
.confirm-modal.hide { transform: scale(0.96); opacity: 0; }

.confirm-modal h2 { margin: 0 0 8px; }
.confirm-modal p { margin: 0 0 14px; color: #333; }

.confirm-msg { margin-bottom: 12px; padding: 10px 12px; border-radius: 6px; background: #fff6f6; color: #7a1a1a; border: 1px solid #ffd6d6; }

.confirm-actions { display: flex; gap: 10px; justify-content: flex-end; }
.btn-danger { background: #c62828; color: #fff; border: none; padding: 9px 14px; border-radius: 6px; font-weight:600; cursor: pointer; }
.btn-danger[disabled] { opacity: 0.7; cursor: default; }
.btn-cancel { background: transparent; border: 1px solid #ddd; padding: 9px 12px; border-radius: 6px; cursor: pointer; }

/* ============================================================================
   ENLACES ESPECIALES
   ============================================================================ */
.register-link,
.login-link {
    text-align: center;
    margin-top: var(--spacing-lg);
    color: var(--text-secondary);
}

.register-link a,
.login-link a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: bold;
}

.register-link a:hover,
.login-link a:hover {
    text-decoration: underline;
}

/* ============================================================================
   TIPOGRAFÍA
   ============================================================================ */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s;
}

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

/* ============================================================================
   UTILIDADES
   ============================================================================ */
.loading {
    text-align: center;
    color: white;
}

.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: var(--spacing-lg);
}

.mb-20 {
    margin-bottom: var(--spacing-lg);
}

/* ============================================================================
   RESPONSIVE DESIGN
   ============================================================================ */
@media (max-width: 768px) {
    body {
        font-size: 14px;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .container.panel-container {
        margin: var(--spacing-lg) auto;
    }
    
    table {
        font-size: 14px;
    }
    
    table th,
    table td {
        padding: 8px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .navbar {
        padding: var(--spacing-sm) var(--spacing-lg);
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .navbar h1 {
        font-size: 20px;
    }
    
    .login-container,
    .registro-container {
        padding: var(--spacing-lg);
    }
    
    .content-box {
        padding: var(--spacing-xxl) var(--spacing-lg);
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn-group .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .navbar h1 {
        font-size: 18px;
    }
    
    .content-box h2 {
        font-size: 24px;
    }
    
    .content-box p {
        font-size: 16px;
    }
}