:root {
    --kz-primary: #0b3d91;
    --kz-primary-light: #1a56c4;
    --kz-primary-soft: #e8eefb;
    --kz-success-soft: #e6f7ef;
    --kz-info-soft: #e5f2fb;
    --kz-bg: #f4f7fc;
    --kz-border: #e3e8f0;
    --kz-text: #1f2937;
    --kz-text-muted: #6b7280;
    --kz-sidebar-width: 260px;
}

* {
    box-sizing: border-box;
}

body {
    background-color: var(--kz-bg);
    color: var(--kz-text);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

/* ---------- Auth (login) ---------- */
.auth-body {
    background: linear-gradient(135deg, var(--kz-primary) 0%, var(--kz-primary-light) 100%);
    min-height: 100vh;
}

.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.auth-card {
    background: #fff;
    border-radius: 1rem;
    box-shadow: 0 20px 45px rgba(11, 61, 145, 0.25);
    padding: 2.5rem;
    width: 100%;
    max-width: 420px;
    text-align: center;
}

.auth-logo {
    width: 64px;
    height: 64px;
    margin: 0 auto 1rem;
    border-radius: 50%;
    background: var(--kz-primary-soft);
    color: var(--kz-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
}

.auth-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--kz-primary);
    margin-bottom: 0.25rem;
}

.auth-subtitle {
    color: var(--kz-text-muted);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.auth-card .form-label {
    text-align: left;
    display: block;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--kz-text);
}

.auth-card .btn-primary {
    background-color: var(--kz-primary);
    border-color: var(--kz-primary);
    font-weight: 600;
    padding: 0.6rem;
}

.auth-card .btn-primary:hover {
    background-color: var(--kz-primary-light);
    border-color: var(--kz-primary-light);
}

/* ---------- App shell ---------- */
.app-wrapper {
    display: flex;
    min-height: 100vh;
}

.app-sidebar {
    width: var(--kz-sidebar-width);
    background: var(--kz-primary);
    color: #fff;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: margin-left 0.25s ease;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 1.4rem 1.25rem;
    font-weight: 700;
    font-size: 1.05rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.sidebar-brand i {
    font-size: 1.4rem;
}

.sidebar-nav {
    padding: 1rem 0.75rem;
    flex: 1;
}

.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: rgba(255, 255, 255, 0.85);
    padding: 0.65rem 0.85rem;
    border-radius: 0.5rem;
    margin-bottom: 0.25rem;
    font-size: 0.92rem;
    text-decoration: none;
}

.sidebar-nav .nav-link:hover:not(.disabled) {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

.sidebar-nav .nav-link.active {
    background: rgba(255, 255, 255, 0.16);
    color: #fff;
    font-weight: 600;
}

.sidebar-nav .nav-link.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.badge-soon {
    margin-left: auto;
    font-size: 0.62rem;
    background: rgba(255, 255, 255, 0.18);
    padding: 0.15rem 0.4rem;
    border-radius: 0.35rem;
}

.sidebar-logout {
    padding: 0.75rem;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.sidebar-brand-logo {
    max-height: 28px;
    max-width: 120px;
    object-fit: contain;
}

.app-footer {
    padding: 1rem 1.75rem;
    text-align: center;
    color: var(--kz-text-muted);
    font-size: 0.82rem;
    border-top: 1px solid var(--kz-border);
}

.nav-link-button {
    width: 100%;
    background: none;
    border: none;
    cursor: pointer;
}

.app-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.app-topbar {
    background: #fff;
    border-bottom: 1px solid var(--kz-border);
    padding: 0.9rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.4rem;
    color: var(--kz-primary);
}

.topbar-title {
    font-weight: 700;
    color: var(--kz-primary);
}

.topbar-admin {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--kz-text);
    font-size: 0.92rem;
}

.topbar-admin i {
    font-size: 1.4rem;
    color: var(--kz-primary);
}

.app-content {
    padding: 1.75rem;
}

.page-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--kz-primary);
    margin-bottom: 0.15rem;
}

/* ---------- Stat cards ---------- */
.stat-card {
    background: #fff;
    border: 1px solid var(--kz-border);
    border-radius: 0.85rem;
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    height: 100%;
}

.stat-icon {
    width: 52px;
    height: 52px;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: var(--kz-primary);
}

.bg-primary-soft { background: var(--kz-primary-soft); }
.bg-success-soft { background: var(--kz-success-soft); color: #14804a; }
.bg-info-soft { background: var(--kz-info-soft); color: #0b6aa2; }

.stat-body {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--kz-text);
}

.stat-label {
    color: var(--kz-text-muted);
    font-size: 0.85rem;
}

/* ---------- Welcome card ---------- */
.welcome-card {
    background: linear-gradient(135deg, var(--kz-primary) 0%, var(--kz-primary-light) 100%);
    color: #fff;
    border-radius: 0.85rem;
    padding: 1.75rem;
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.welcome-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.18);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    flex-shrink: 0;
}

.welcome-card h2 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.welcome-card p {
    margin: 0;
    opacity: 0.9;
    font-size: 0.92rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 991.98px) {
    .sidebar-toggle {
        display: inline-flex;
        align-items: center;
    }

    .app-sidebar {
        position: fixed;
        inset: 0 auto 0 0;
        z-index: 1040;
        margin-left: calc(var(--kz-sidebar-width) * -1);
    }

    .app-sidebar.is-open {
        margin-left: 0;
        box-shadow: 0 0 30px rgba(0, 0, 0, 0.25);
    }
}

/* ---------- Admin - Inscripciones (Fase 4) ---------- */
.admin-toolbar {
    display: block;
}

.admin-table-wrapper {
    background: #fff;
    border: 1px solid var(--kz-border);
    border-radius: 0.85rem;
    padding: 0.5rem 1rem;
}

.admin-table thead th {
    color: var(--kz-text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    border-bottom-width: 1px;
}

.admin-table th.sortable {
    cursor: pointer;
    user-select: none;
}

.admin-table th.sortable:hover {
    color: var(--kz-primary);
}

.admin-table th.sortable::after {
    content: '\2195';
    margin-left: 0.25rem;
    opacity: 0.5;
}

.badge-estado {
    display: inline-block;
    padding: 0.35rem 0.75rem;
    border-radius: 50rem;
    font-size: 0.78rem;
    font-weight: 700;
}

.badge-estado-pendiente {
    background: #fff3cd;
    color: #8a6408;
}

.badge-estado-verificado {
    background: var(--kz-success-soft);
    color: #14804a;
}

.badge-estado-observado {
    background: #ffe4cc;
    color: #a5540d;
}

.badge-estado-cancelado {
    background: #f8d7da;
    color: #a12631;
}

.student-detail-card {
    border: 1px solid var(--kz-border);
    border-radius: 0.65rem;
    padding: 1rem;
}

.historial-timeline {
    list-style: none;
    margin: 0;
    padding: 0;
}

.historial-timeline li {
    border-left: 2px solid var(--kz-border);
    padding: 0 0 1rem 1rem;
    margin-left: 0.35rem;
}

/* ---------- Centro Inteligente de Reportes (Fase 6) ---------- */
.reporte-chart {
    max-height: 260px;
}

.historial-timeline li:last-child {
    padding-bottom: 0;
}

.comprobante-preview-img-admin {
    max-width: 280px;
    max-height: 280px;
    border-radius: 0.6rem;
    border: 1px solid var(--kz-border);
    object-fit: cover;
}

.comprobante-preview-pdf {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--kz-text);
    background: var(--kz-primary-soft);
    border-radius: 0.6rem;
    padding: 0.6rem 1rem;
}

.comprobante-preview-pdf i {
    font-size: 1.4rem;
    color: #c0392b;
}

/* ---------- Centro de Configuracion (Fase 7) ---------- */
.config-tabs {
    flex-wrap: wrap;
    border-bottom: 1px solid var(--kz-border);
}

.config-tabs .nav-link {
    color: var(--kz-text-muted);
    font-weight: 600;
    font-size: 0.9rem;
}

.config-tabs .nav-link.active {
    color: var(--kz-primary);
    border-color: var(--kz-border) var(--kz-border) #fff;
}

.config-image-preview {
    display: block;
    max-width: 220px;
    max-height: 140px;
    object-fit: contain;
    border: 1px solid var(--kz-border);
    border-radius: 0.6rem;
    padding: 0.5rem;
    background: #fff;
}

.config-image-empty {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--kz-text-muted);
    border: 2px dashed var(--kz-border);
    border-radius: 0.6rem;
    padding: 0.75rem 1rem;
    width: fit-content;
}