/* ==========================================
   GÉNESIS ERP - Mobile-First Professional
   Diseño moderno, responsive, app-like
========================================== */

:root {
    /* Colores */
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #0ea5e9;
    
    /* Grises */
    --dark: #1f2937;
    --gray-900: #111827;
    --gray-800: #1f2937;
    --gray-700: #374151;
    --gray-600: #4b5563;
    --gray-500: #6b7280;
    --gray-400: #9ca3af;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --gray-100: #f3f4f6;
    --light: #f9fafb;
    --white: #ffffff;
    
    /* Tipografía */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-sm: 13px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 28px;
    
    /* Espaciado */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 24px;
    --spacing-2xl: 32px;
    
    /* Sombras */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    
    /* Bordes */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

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

html {
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--light);
}

/* ==========================================
   HEADER - Mobile First
========================================== */

header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-lg) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-lg);
}

header h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin: 0;
}

header nav {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--primary-dark);
    flex-direction: column;
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
    border-top: 1px solid rgba(255,255,255,0.1);
}

header nav.active {
    display: flex;
}

header nav a {
    color: white;
    text-decoration: none;
    font-size: var(--font-size-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-sm);
    transition: background 0.3s;
    display: block;
}

header nav a:hover,
header nav a.active {
    background: rgba(255,255,255,0.2);
}

header nav a:last-child {
    border-top: 1px solid rgba(255,255,255,0.2);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-lg);
}

/* Hamburguesa */
.menu-toggle {
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    padding: var(--spacing-sm);
}

/* ==========================================
   MAIN CONTENT
========================================== */

body > div:not(header):not(footer),
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* ==========================================
   TIPOGRAFÍA
========================================== */

h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-lg);
}

h2 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--spacing-md);
}

p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
}

/* ==========================================
   BOTONES
========================================== */

.btn-new, .btn-submit, .btn-cancel, button {
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    min-height: 44px;
    font-family: var(--font-family);
}

.btn-new, .btn-submit {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: var(--shadow-md);
    width: 100%;
}

.btn-new:active, .btn-submit:active {
    transform: scale(0.98);
    box-shadow: var(--shadow-sm);
}

.btn-cancel {
    background: var(--gray-200);
    color: var(--gray-800);
    width: 100%;
}

.btn-cancel:active {
    background: var(--gray-300);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ==========================================
   FORMULARIOS
========================================== */

.form-group {
    margin-bottom: var(--spacing-xl);
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-800);
    font-size: var(--font-size-base);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-lg);
    transition: border-color 0.3s;
    background: white;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

textarea {
    resize: vertical;
    min-height: 120px;
}

/* ==========================================
   TARJETAS
========================================== */

.card, .invoice-card, .customer-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-lg);
}

/* Cards estadísticas */
.stat-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary);
    margin-bottom: var(--spacing-lg);
}

.stat-card-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-900);
    margin: var(--spacing-lg) 0;
}

.stat-card-label {
    font-size: var(--font-size-base);
    color: var(--gray-600);
}

/* ==========================================
   TABLAS - Mobile Responsive
========================================== */

.table {
    width: 100%;
    border-collapse: collapse;
}

.table thead {
    background: var(--gray-100);
}

.table th {
    padding: var(--spacing-lg);
    text-align: left;
    font-weight: 600;
    color: var(--gray-800);
    border-bottom: 2px solid var(--gray-300);
    font-size: var(--font-size-sm);
}

.table td {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
}

.table tbody tr {
    transition: background 0.3s;
}

.table tbody tr:active {
    background: var(--gray-50);
}

/* Tabla apilada en móvil */
@media (max-width: 768px) {
    .table thead {
        display: none;
    }
    
    .table, .table tbody, .table tr, .table td {
        display: block;
        width: 100%;
    }
    
    .table tr {
        margin-bottom: var(--spacing-xl);
        border: 1px solid var(--gray-200);
        border-radius: var(--radius-md);
        padding: var(--spacing-lg);
    }
    
    .table td {
        padding: var(--spacing-md) 0;
        border: none;
        text-align: left;
        display: flex;
        justify-content: space-between;
    }
    
    .table td::before {
        content: attr(data-label);
        font-weight: 600;
        color: var(--gray-600);
        margin-right: var(--spacing-lg);
    }
}

/* ==========================================
   MENSAJES
========================================== */

.error, .alert-error {
    background: #fee;
    color: #c33;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--danger);
    font-size: var(--font-size-base);
}

.success {
    background: #efe;
    color: #3c3;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--success);
}

/* ==========================================
   LOGIN
========================================== */

.login {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    padding: var(--spacing-lg);
}

.login-box {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    font-size: var(--font-size-2xl);
}

/* ==========================================
   FOOTER
========================================== */

footer {
    background: var(--gray-800);
    color: var(--gray-400);
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    font-size: var(--font-size-sm);
    border-top: 1px solid var(--gray-700);
    margin-top: var(--spacing-2xl);
}

/* ==========================================
   GRID RESPONSIVE
========================================== */

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid.cols-2 {
    grid-template-columns: 1fr;
}

.grid.cols-3 {
    grid-template-columns: 1fr;
}

/* ==========================================
   UTILIDADES
========================================== */

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

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

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

.flex {
    display: flex;
}

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

.gap-lg {
    gap: var(--spacing-lg);
}

/* ==========================================
   TABLET (768px+)
========================================== */

@media (min-width: 768px) {
    body > div:not(header):not(footer),
    .main-content {
        padding: var(--spacing-2xl);
    }
    
    h1 {
        font-size: var(--font-size-3xl);
    }
    
    h2 {
        font-size: var(--font-size-2xl);
    }
    
    .grid.cols-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .grid.cols-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .btn-new, .btn-submit, .btn-cancel {
        width: auto;
    }
    
    header nav {
        display: flex !important;
        position: static;
        background: transparent;
        flex-direction: row;
        padding: 0;
        gap: var(--spacing-xl);
        margin-left: var(--spacing-2xl);
        border: none;
    }
    
    .menu-toggle {
        display: none;
    }
}

/* ==========================================
   DESKTOP (1024px+)
========================================== */

@media (min-width: 1024px) {
    .grid.cols-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ==========================================
   ESPECIAL: Acciones en Tablas
========================================== */

.table-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}

.table-actions a,
.table-actions button {
    padding: 8px 12px;
    font-size: var(--font-size-sm);
    width: auto;
    min-height: auto;
}

@media (max-width: 768px) {
    .table-actions {
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .table-actions a,
    .table-actions button {
        flex: 1;
        min-width: 80px;
    }
}