/* ============================================
   VARIABLES CSS (Temas claro/oscuro)
   ============================================ */
:root {
    /* Tema claro (por defecto) */
    --bg-primary: #f0f4f8;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-nav: #1a202c;
    --bg-input: #ffffff;
    --text-primary: #2d3748;
    --text-secondary: #4a5568;
    --text-nav: #e2e8f0;
    --text-light: #718096;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 10px 15px rgba(0, 0, 0, 0.15);
    --radius: 12px;
    --radius-sm: 6px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --color-primary: #2b6cb0;
    --color-primary-hover: #2c5282;
    --color-success: #38a169;
    --color-warning: #d69e2e;
    --color-danger: #e53e3e;
    --color-info: #3182ce;
}

[data-theme="dark"] {
    --bg-primary: #1a202c;
    --bg-secondary: #2d3748;
    --bg-card: #2d3748;
    --bg-nav: #0d1117;
    --bg-input: #4a5568;
    --text-primary: #e2e8f0;
    --text-secondary: #cbd5e0;
    --text-nav: #e2e8f0;
    --text-light: #a0aec0;
    --border-color: #4a5568;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 10px 15px rgba(0, 0, 0, 0.4);
    --color-primary: #4299e1;
    --color-primary-hover: #3182ce;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background 0.3s, color 0.3s;
}

/* ============================================
   NAVEGACIÓN
   ============================================ */
.navbar {
    background: var(--bg-nav);
    color: var(--text-nav);
    padding: 0 2rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: #fff;
}

.nav-brand i {
    font-size: 1.5rem;
    color: #63b3ed;
}

.nav-menu {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    background: transparent;
    border: none;
    color: var(--text-nav);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.nav-btn.active {
    background: var(--color-primary);
    color: #fff;
}

.nav-actions {
    display: flex;
    gap: 0.5rem;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-nav);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.3rem 0.6rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* ============================================
   CONTENEDOR PRINCIPAL
   ============================================ */
.container {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 2rem;
}

/* ============================================
   VISTAS
   ============================================ */
.view {
    display: none;
    animation: fadeIn 0.3s ease;
}

.view.active {
    display: block;
}

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

/* ============================================
   DASHBOARD
   ============================================ */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.dashboard-header h1 {
    font-size: 1.8rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.stats-badge {
    background: var(--color-primary);
    color: #fff;
    padding: 0.4rem 1.2rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
}

/* Grid de máquinas */
.machine-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.machine-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    position: relative;
}

.machine-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--color-primary);
}

.machine-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.machine-card .machine-meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.machine-card .machine-badge {
    display: inline-block;
    background: var(--color-primary);
    color: #fff;
    padding: 0.2rem 0.8rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

.machine-card .maintenance-count {
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--text-light);
}

/* Panel de detalle */
.detail-panel {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-top: 1.5rem;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.detail-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.detail-header h2 {
    font-size: 1.4rem;
}

.close-detail {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
    transition: var(--transition);
    padding: 0.3rem 0.6rem;
    border-radius: var(--radius-sm);
}

.close-detail:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

/* Tabla de mantenimientos */
.maintenance-table-container {
    overflow-x: auto;
}

.maintenance-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.maintenance-table th {
    text-align: left;
    padding: 0.75rem 1rem;
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-weight: 600;
    border-bottom: 2px solid var(--border-color);
}

.maintenance-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.maintenance-table tr:hover {
    background: var(--bg-primary);
}

.tipo-badge {
    display: inline-block;
    padding: 0.2rem 0.8rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

.tipo-badge.correctivo {
    background: #feb2b2;
    color: #c53030;
}

.tipo-badge.preventivo {
    background: #b2d4fe;
    color: #2b6cb0;
}

.tipo-badge.reemplazo {
    background: #fbd38d;
    color: #975a16;
}

/* Mensaje de máquinas vacías */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-light);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* ============================================
   FORMULARIOS
   ============================================ */
.form-container {
    max-width: 650px;
    margin: 0 auto;
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.form-container h2 {
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.7rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-input);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(43, 108, 176, 0.2);
}

.form-group input.error,
.form-group select.error,
.form-group textarea.error {
    border-color: var(--color-danger);
}

.error-message {
    display: block;
    color: var(--color-danger);
    font-size: 0.85rem;
    margin-top: 0.3rem;
    min-height: 1.2rem;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.btn {
    padding: 0.7rem 1.8rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

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

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

.btn-secondary:hover {
    background: var(--text-light);
    color: #fff;
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 9999;
}

.toast {
    background: var(--bg-card);
    color: var(--text-primary);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-hover);
    border-left: 4px solid var(--color-primary);
    animation: slideInRight 0.4s ease;
    min-width: 280px;
    max-width: 400px;
}

.toast.success { border-left-color: var(--color-success); }
.toast.error { border-left-color: var(--color-danger); }
.toast.warning { border-left-color: var(--color-warning); }

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(100px); }
    to { opacity: 1; transform: translateX(0); }
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .nav-container {
        flex-wrap: wrap;
        height: auto;
        padding: 0.5rem 0;
    }

    .nav-menu {
        order: 3;
        width: 100%;
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.3rem;
        padding: 0.5rem 0;
    }

    .nav-btn {
        font-size: 0.8rem;
        padding: 0.3rem 0.7rem;
    }

    .nav-btn i {
        display: none;
    }

    .container {
        padding: 0 1rem;
        margin: 1rem auto;
    }

    .form-container {
        padding: 1.5rem;
    }

    .machine-grid {
        grid-template-columns: 1fr;
    }

    .dashboard-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .toast-container {
        left: 1rem;
        right: 1rem;
        bottom: 1rem;
    }

    .toast {
        min-width: auto;
        max-width: 100%;
    }

    .form-actions {
        flex-direction: column;
    }

    .btn {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .nav-brand span {
        font-size: 1rem;
    }

    .nav-btn {
        font-size: 0.7rem;
        padding: 0.2rem 0.5rem;
    }

    .maintenance-table {
        font-size: 0.8rem;
    }

    .maintenance-table th,
    .maintenance-table td {
        padding: 0.4rem 0.6rem;
    }
}