/* =============================================
   BOOKLY - Sistema de Gestión de Préstamos
   Estilos CSS - Tema Blanco y Negro
   ============================================= */

/* Reset y Variables */
:root {
    --color-black: #000000;
    --color-white: #ffffff;
    --color-gray-50: #fafafa;
    --color-gray-100: #f5f5f5;
    --color-gray-200: #e5e5e5;
    --color-gray-300: #d4d4d4;
    --color-gray-400: #a3a3a3;
    --color-gray-500: #737373;
    --color-gray-600: #525252;
    --color-gray-700: #404040;
    --color-gray-800: #262626;
    --color-gray-900: #171717;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--color-gray-50);
    color: var(--color-gray-900);
    line-height: 1.6;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header */
.header {
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--color-black);
}

.logo-icon {
    width: 40px;
    height: 40px;
    border: 2px solid var(--color-black);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon svg {
    width: 24px;
    height: 24px;
}

.logo-text h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.logo-text span {
    font-size: 0.75rem;
    font-style: italic;
    color: var(--color-gray-600);
}

.version-badge {
    background-color: var(--color-black);
    color: var(--color-white);
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.625rem;
    font-weight: 500;
    letter-spacing: 0.05em;
}

/* Navigation */
.nav {
    display: flex;
    gap: 0.5rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-600);
    transition: all 0.2s ease;
}

.nav-link:hover {
    background-color: var(--color-gray-100);
    color: var(--color-black);
}

.nav-link.active {
    background-color: var(--color-black);
    color: var(--color-white);
}

.nav-link svg {
    width: 18px;
    height: 18px;
}

/* Main Content */
.main {
    padding: 2rem 0;
}

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

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-black);
}

.page-subtitle {
    color: var(--color-gray-500);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* Cards */
.card {
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--color-gray-200);
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-icon.primary {
    background-color: var(--color-black);
    color: var(--color-white);
}

.stat-icon.secondary {
    background-color: var(--color-gray-100);
    color: var(--color-black);
}

.stat-icon.warning {
    background-color: var(--color-gray-800);
    color: var(--color-white);
}

.stat-icon.success {
    background-color: var(--color-gray-200);
    color: var(--color-black);
}

.stat-icon svg {
    width: 24px;
    height: 24px;
}

.stat-content h3 {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.stat-content p {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-black);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    white-space: nowrap;
}

.btn svg {
    width: 18px;
    height: 18px;
}

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

.btn-primary:hover {
    background-color: var(--color-gray-800);
}

.btn-secondary {
    background-color: var(--color-white);
    color: var(--color-black);
    border: 1px solid var(--color-gray-300);
}

.btn-secondary:hover {
    background-color: var(--color-gray-50);
    border-color: var(--color-gray-400);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-black);
    border: 2px solid var(--color-black);
}

.btn-outline:hover {
    background-color: var(--color-black);
    color: var(--color-white);
}

.btn-danger {
    background-color: #dc2626;
    color: var(--color-white);
    border: 1px solid #dc2626;
}

.btn-danger:hover {
    background-color: #b91c1c;
    border-color: #b91c1c;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.btn-icon {
    padding: 0.5rem;
}

/* Table */
.table-container {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.table th {
    text-align: left;
    padding: 0.875rem 1rem;
    background-color: var(--color-gray-50);
    font-weight: 600;
    color: var(--color-gray-700);
    border-bottom: 1px solid var(--color-gray-200);
    white-space: nowrap;
}

.table td {
    padding: 1rem;
    border-bottom: 1px solid var(--color-gray-100);
    vertical-align: middle;
}

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

.table tbody tr:last-child td {
    border-bottom: none;
}

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

.badge-active {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #6ee7b7;
    font-weight: 600;
}

.badge-returned {
    background-color: #dbeafe;
    color: #0c4a6e;
    border: 1px solid #7dd3fc;
    font-weight: 600;
}

.badge-overdue {
    background-color: #fee2e2;
    color: #7f1d1d;
    border: 1px solid #fca5a5;
    font-weight: 600;
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-gray-700);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    color: var(--color-gray-900);
    background-color: var(--color-white);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-black);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
}

.form-control::placeholder {
    color: var(--color-gray-400);
}

.form-control:disabled {
    background-color: var(--color-gray-100);
    cursor: not-allowed;
}

select.form-control {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.75rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}

textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-gray-200);
}

/* Alerts */
.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.alert svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.alert-success {
    background-color: var(--color-gray-100);
    border: 1px solid var(--color-gray-300);
    color: var(--color-black);
}

.alert-error {
    background-color: var(--color-gray-800);
    color: var(--color-white);
}

.alert-warning {
    background-color: var(--color-gray-200);
    border: 1px solid var(--color-gray-400);
    color: var(--color-black);
}

/* Action Buttons in Table */
.action-buttons {
    display: flex;
    gap: 0.5rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
}

.empty-state svg {
    width: 64px;
    height: 64px;
    color: var(--color-gray-300);
    margin-bottom: 1rem;
}

.empty-state h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--color-gray-500);
    margin-bottom: 1.5rem;
}

/* Search and Filters */
.filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.search-box {
    position: relative;
    flex: 1;
    min-width: 250px;
}

.search-box input {
    padding-left: 2.75rem;
}

.search-box svg {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--color-gray-400);
}

.filter-select {
    min-width: 150px;
}

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

.modal {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--color-gray-200);
}

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

.modal-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
    color: var(--color-gray-500);
    transition: color 0.2s ease;
}

.modal-close:hover {
    color: var(--color-black);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--color-gray-200);
}

/* Footer */
.footer {
    background-color: var(--color-white);
    border-top: 1px solid var(--color-gray-200);
    padding: 1.5rem 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-text {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8125rem;
    color: var(--color-gray-500);
}

.footer-text svg {
    width: 16px;
    height: 16px;
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav {
        width: 100%;
        overflow-x: auto;
        padding-bottom: 0.5rem;
    }

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

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

    .form-row {
        grid-template-columns: 1fr;
    }

    .filters {
        flex-direction: column;
    }

    .search-box {
        width: 100%;
    }

    .table th,
    .table td {
        padding: 0.75rem 0.5rem;
    }

    .action-buttons {
        flex-direction: column;
    }

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

    .form-actions .btn {
        width: 100%;
    }
}

/* Print Styles */
@media print {
    .header,
    .nav,
    .btn,
    .action-buttons,
    .filters {
        display: none !important;
    }

    .main {
        padding: 0;
    }

    .card {
        border: none;
        box-shadow: none;
    }
}