/* YKS AI Öğretmen — pastel mavi tema */

:root {
    --bs-body-font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --bs-body-bg: #e8eef5;
    --yks-blue: #5b9fd4;
    --yks-blue-deep: #3d86c0;
    --yks-blue-soft: #d4e6f5;
    --yks-blue-ink: #1e4d7b;
    --yks-teal: #5aa8a0;
    --glass-bg: rgba(248, 250, 252, 0.92);
    --glass-bg-strong: #f8fafc;
    --glass-border: rgba(30, 41, 59, 0.12);
    --glass-shadow: 0 4px 18px rgba(15, 23, 42, 0.07);
    --sidebar-width: 260px;
    --admin-text: #1a1d26;
    --admin-muted: #64748b;
    --surface: #f1f5f9;
    --surface-raised: #ffffff;
}

body {
    -webkit-font-smoothing: antialiased;
}

.admin-body {
    background:
        radial-gradient(ellipse at 0% 0%, rgba(91, 159, 212, 0.14) 0%, transparent 48%),
        radial-gradient(ellipse at 100% 100%, rgba(90, 168, 160, 0.1) 0%, transparent 45%),
        linear-gradient(165deg, #d9e4ef 0%, #e8eef5 42%, #e4ebe8 100%);
    min-height: 100vh;
    color: var(--admin-text);
}

.admin-body.sidebar-open {
    overflow: hidden;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.admin-layout {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1040;
    width: var(--sidebar-width);
    height: 100vh;
    display: flex;
    flex-direction: column;
    border-radius: 0;
    border-top: none;
    border-bottom: none;
    border-left: none;
    transition: transform 0.28s ease;
}

.admin-sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.125rem 1rem;
    border-bottom: 1px solid rgba(26, 29, 38, 0.06);
}

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

.admin-brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.admin-brand-title {
    font-weight: 700;
    font-size: 1rem;
}

.admin-brand-sub {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--admin-muted);
}

.admin-sidebar-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 8px;
    background: rgba(26, 29, 38, 0.06);
    color: var(--admin-text);
    cursor: pointer;
}

.admin-nav {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem 0.75rem 1rem;
}

.admin-nav-label {
    display: block;
    padding: 0.5rem 0.75rem;
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--admin-muted);
}

.admin-nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.admin-nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 0.75rem;
    border-radius: 10px;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    color: #4a5068;
    transition: background 0.15s ease, color 0.15s ease;
}

.admin-nav-link:hover {
    background: rgba(255, 255, 255, 0.55);
    color: var(--admin-text);
}

.admin-nav-link.active {
    background: rgba(91, 159, 212, 0.16);
    color: var(--yks-blue-ink);
    font-weight: 600;
    box-shadow: inset 3px 0 0 var(--yks-blue-deep);
}

.admin-nav-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.5);
    flex-shrink: 0;
}

.admin-nav-link.active .admin-nav-icon {
    background: rgba(91, 159, 212, 0.28);
}

.admin-sidebar-footer {
    padding: 0.75rem 0.75rem 1.25rem;
    border-top: 1px solid rgba(26, 29, 38, 0.06);
}

.admin-sidebar-copy {
    margin: 0.75rem 0 0;
    padding: 0 0.75rem;
    font-size: 0.75rem;
    color: var(--admin-muted);
}

.admin-sidebar-overlay {
    position: fixed;
    inset: 0;
    z-index: 1035;
    background: rgba(26, 29, 38, 0.35);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
}

.admin-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-width: 0;
}

.admin-topbar {
    position: sticky;
    top: 0;
    z-index: 1020;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.875rem 1.5rem;
    border-radius: 0;
    border-top: none;
    border-left: none;
    border-right: none;
}

.admin-topbar-start {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    min-width: 0;
}

.admin-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border: 1px solid rgba(26, 29, 38, 0.08);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.6);
    color: var(--admin-text);
    cursor: pointer;
}

.admin-page-title {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    min-width: 0;
}

.admin-page-heading {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.admin-page-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.5rem;
    border-radius: 9999px;
    background: rgba(61, 134, 192, 0.16);
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--yks-blue-ink);
    flex-shrink: 0;
}

.admin-topbar-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.admin-topbar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border: 1px solid rgba(26, 29, 38, 0.08);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.6);
    color: var(--admin-text);
    cursor: pointer;
    text-decoration: none;
}

.admin-user-chip {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.75rem 0.375rem 0.375rem;
    border: 1px solid rgba(26, 29, 38, 0.08);
    border-radius: 9999px;
    background: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    color: var(--admin-text);
    font-size: 0.8125rem;
    font-weight: 500;
}

.admin-user-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(61, 134, 192, 0.2);
    color: var(--yks-blue-ink);
    overflow: hidden;
}

.admin-user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.admin-logout-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.4375rem 0.875rem;
    border-radius: 10px;
    border: 1px solid rgba(220, 53, 69, 0.25);
    background: rgba(220, 53, 69, 0.08);
    color: #dc3545;
    font-size: 0.8125rem;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.15s ease;
}

.admin-logout-btn:hover {
    background: rgba(220, 53, 69, 0.15);
    color: #dc3545;
}

.admin-content {
    flex: 1;
    padding: 1.5rem 0 2rem;
}

.admin-content .container {
    max-width: 1200px;
}

.admin-content .card {
    background: var(--surface-raised);
    border: 1px solid rgba(30, 41, 59, 0.1);
    box-shadow: 0 2px 12px rgba(15, 23, 42, 0.05);
}

@media (max-width: 991.98px) {
    .admin-sidebar {
        transform: translateX(-100%);
    }

    .admin-sidebar.is-open {
        transform: translateX(0);
    }

    .admin-main {
        margin-left: 0;
    }

    .admin-user-name {
        display: none;
    }

    .admin-page-badge {
        display: none;
    }

    .admin-topbar {
        padding: 0.75rem 1rem;
    }

    .admin-content {
        padding: 1rem 0 1.5rem;
    }
}

.yks-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: var(--yks-blue-deep);
    font-size: 0.6875rem;
    font-weight: 800;
    color: #fff;
    flex-shrink: 0;
}

.auth-brand-panel {
    background: linear-gradient(135deg, #7eb6e0 0%, #5b9fd4 55%, #3d86c0 100%);
    min-height: 100vh;
}

.btn-yks-primary {
    background: var(--yks-blue-deep);
    border-color: var(--yks-blue-deep);
    color: #fff;
    font-weight: 600;
}

.btn-yks-primary:hover,
.btn-yks-primary:focus {
    background: #2f74ad;
    border-color: #2f74ad;
    color: #fff;
}