/* ===================================================
   SISTEMA DE GESTIÓN DE ESTUDIANTES - GAIA
   Estilos principales
   =================================================== */

/* ===================================================
   VARIABLES Y RESET
   =================================================== */
:root {
    --primary: #1a1a2e;
    --primary-light: #16213e;
    --secondary: #667eea;
    --secondary-dark: #764ba2;
    --success: #27ae60;
    --warning: #f39c12;
    --danger: #e74c3c;
    --info: #3498db;
    --light: #ecf0f1;
    --dark: #2c3e50;
    --gray: #95a5a6;
    --white: #ffffff;
    --shadow: 0 2px 15px rgba(0,0,0,0.08);
    --shadow-hover: 0 5px 30px rgba(0,0,0,0.12);
    --radius: 12px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f0f2f5;
    color: var(--dark);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===================================================
   CONTAINER
   =================================================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* ===================================================
   MAIN CONTENT
   =================================================== */
main {
    flex: 1;
    padding: 25px 0;
}

/* ===================================================
   CARDS
   =================================================== */
.card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 20px 25px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-hover);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
    margin-bottom: 25px;
}

.card-stat {
    text-align: center;
    padding: 25px 20px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card-stat::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--secondary);
}

.card-stat:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.card-stat .number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark);
    line-height: 1.2;
}

.card-stat .label {
    color: var(--gray);
    font-size: 0.85rem;
    margin-top: 5px;
    font-weight: 500;
}

.card-stat .icon {
    font-size: 2rem;
    margin-bottom: 8px;
    display: block;
}

/* ===================================================
   PAGE HEADER
   =================================================== */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    flex-wrap: wrap;
    gap: 10px;
}

.page-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
}

.page-header .actions {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.total {
    background: var(--light);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--dark);
    font-weight: 500;
}

/* ===================================================
   BUTTONS
   =================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    font-family: inherit;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: var(--secondary);
    color: white;
}
.btn-primary:hover {
    background: #5a6fd6;
}

.btn-success {
    background: var(--success);
    color: white;
}
.btn-success:hover {
    background: #219a52;
}

.btn-warning {
    background: var(--warning);
    color: white;
}
.btn-warning:hover {
    background: #d68910;
}

.btn-danger {
    background: var(--danger);
    color: white;
}
.btn-danger:hover {
    background: #c0392b;
}

.btn-info {
    background: var(--info);
    color: white;
}
.btn-info:hover {
    background: #2980b9;
}

.btn-secondary {
    background: var(--light);
    color: var(--dark);
}
.btn-secondary:hover {
    background: #d5d8dc;
}

.btn-sm {
    padding: 5px 12px;
    font-size: 0.8rem;
}

.btn-lg {
    padding: 12px 28px;
    font-size: 1rem;
}

.btn-block {
    display: block;
    width: 100%;
    justify-content: center;
}

.btn-link {
    background: transparent;
    color: var(--secondary);
    text-decoration: underline;
}
.btn-link:hover {
    background: transparent;
    color: var(--secondary-dark);
}

/* ===================================================
   TABLES
   =================================================== */
.table-responsive {
    overflow-x: auto;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.table thead {
    background: #f8f9fa;
}

.table th {
    text-align: left;
    padding: 14px 16px;
    font-weight: 600;
    color: var(--dark);
    border-bottom: 2px solid #ecf0f1;
    white-space: nowrap;
}

.table td {
    padding: 12px 16px;
    border-bottom: 1px solid #ecf0f1;
    vertical-align: middle;
}

.table tbody tr {
    transition: var(--transition);
}

.table tbody tr:hover {
    background: #f8f9fa;
}

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

/* ===================================================
   BADGES
   =================================================== */
.badge {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: capitalize;
    letter-spacing: 0.3px;
}

.badge-activo {
    background: #d4edda;
    color: #155724;
}

.badge-reinscrito {
    background: #cce5ff;
    color: #004085;
}

.badge-graduado {
    background: #d1ecf1;
    color: #0c5460;
}

.badge-retirado {
    background: #f8d7da;
    color: #721c24;
}

.badge-historico {
    background: #e2e3e5;
    color: #383d41;
}

.badge-default {
    background: #e9ecef;
    color: #495057;
}

/* ===================================================
   FILTERS
   =================================================== */
.filters {
    background: var(--white);
    padding: 20px;
    border-radius: var(--radius);
    margin-bottom: 25px;
    box-shadow: var(--shadow);
}

.filter-form {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
}

.filter-form input,
.filter-form select {
    padding: 10px 14px;
    border: 2px solid #ecf0f1;
    border-radius: 8px;
    flex: 1;
    min-width: 150px;
    font-size: 0.9rem;
    transition: var(--transition);
    background: #fafafa;
}

.filter-form input:focus,
.filter-form select:focus {
    outline: none;
    border-color: var(--secondary);
    background: var(--white);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.filter-form input::placeholder {
    color: #bdc3c7;
}

/* ===================================================
   ALERTS
   =================================================== */
.alert {
    padding: 14px 18px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: fadeInDown 0.4s ease;
}

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

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-danger {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-warning {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffc107;
}

.alert-info {
    background: #cce5ff;
    color: #004085;
    border: 1px solid #b8daff;
}

/* ===================================================
   FORMS
   =================================================== */
.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--dark);
    font-size: 0.9rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid #ecf0f1;
    border-radius: 8px;
    font-size: 0.9rem;
    transition: var(--transition);
    background: #fafafa;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--secondary);
    background: var(--white);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

/* ===================================================
   UTILITIES
   =================================================== */
.text-center {
    text-align: center;
}

.text-muted {
    color: var(--gray);
}

.text-success {
    color: var(--success);
}

.text-danger {
    color: var(--danger);
}

.text-warning {
    color: var(--warning);
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

.mt-10 {
    margin-top: 10px;
}

.mb-10 {
    margin-bottom: 10px;
}

.flex {
    display: flex;
}

.flex-wrap {
    flex-wrap: wrap;
}

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

.justify-between {
    justify-content: space-between;
}

.gap-10 {
    gap: 10px;
}

.gap-20 {
    gap: 20px;
}

/* ===================================================
   RESPONSIVE
   =================================================== */
@media (max-width: 992px) {
    .card-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

    .filter-form input,
    .filter-form select {
        min-width: 100%;
        width: 100%;
    }

    .table {
        font-size: 0.8rem;
    }

    .table th,
    .table td {
        padding: 8px 10px;
    }

    .card {
        padding: 15px;
    }
}

@media (max-width: 480px) {
    .card-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .card-stat .number {
        font-size: 2rem;
    }

    .btn {
        padding: 7px 14px;
        font-size: 0.8rem;
    }

    .container {
        padding: 0 12px;
    }

    main {
        padding: 15px 0;
    }

    .page-header h2 {
        font-size: 1.2rem;
    }
}

/* ===================================================
   SCROLLBAR
   =================================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--secondary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-dark);
}

/* ===================================================
   PRINT STYLES
   =================================================== */
@media print {
    .header,
    .nav,
    .footer,
    .btn,
    .no-print {
        display: none !important;
    }

    .card {
        box-shadow: none !important;
        border: 1px solid #ddd;
    }

    body {
        background: white;
    }

    .container {
        max-width: 100%;
    }
}
/* ===================================================
   FOOTER
   =================================================== */
.footer {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: rgba(255, 255, 255, 0.7);
    padding: 25px 0;
    margin-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer .container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-logo img {
    height: 30px;
    width: auto;
}

.footer-logo span {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.85rem;
    font-weight: 300;
    letter-spacing: 0.5px;
}

.footer-copy {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.4);
    margin: 0;
}

.footer-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.footer-version {
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.3);
    margin: 0;
}

.footer-version i {
    margin-right: 4px;
}

.footer-tech {
    display: flex;
    gap: 15px;
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.25);
}

.footer-tech span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.footer-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
}

.footer-user {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.6);
}

.footer-user i {
    color: #667eea;
}

.footer-stats {
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.3);
}

.footer-stats i {
    margin-right: 4px;
}

/* ===================================================
   RESPONSIVE FOOTER
   =================================================== */
@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }

    .footer-left {
        align-items: center;
    }

    .footer-right {
        align-items: center;
    }

    .footer-tech {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .footer {
        padding: 18px 0;
    }

    .footer-logo img {
        height: 24px;
    }

    .footer-logo span {
        font-size: 0.75rem;
    }

    .footer-copy {
        font-size: 0.65rem;
    }

    .footer-tech {
        font-size: 0.6rem;
        gap: 10px;
    }

    .footer-user {
        font-size: 0.7rem;
    }
}