body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: #0f172a;
    color: #e5e7eb;
}

a { color: inherit; text-decoration: none; }

.top-bar {
    background: linear-gradient(90deg, #1d4ed8, #7c3aed);
    padding: 16px 24px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo {
    width: 64px;
    height: 64px;
    object-fit: contain;
    border-radius: 999px;
    background: rgba(255,255,255,0.9);
    padding: 6px;
}

.school-info h1 {
    margin: 0;
    font-size: 22px;
    font-weight: 700;
}

.school-info p {
    margin: 4px 0 0;
    font-size: 13px;
    opacity: .8;
}

.container {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 16px;
    padding: 16px;
}

/* Sidebar */

.sidebar {
    background: rgba(15,23,42,0.95);
    border-radius: 16px;
    padding: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
    border: 1px solid rgba(148,163,184,0.3);
}

.filter-form label {
    display: block;
    margin: 8px 0 4px;
    font-size: 13px;
    color: #9ca3af;
}

.filter-form select,
.filter-form input {
    width: 100%;
    padding: 8px 10px;
    border-radius: 10px;
    border: 1px solid rgba(148,163,184,0.5);
    background: rgba(15,23,42,0.9);
    color: #e5e7eb;
    font-size: 13px;
}

.filter-form button {
    margin-top: 10px;
    width: 100%;
    padding: 9px;
    border-radius: 999px;
    border: none;
    background: linear-gradient(90deg, #22c55e, #16a34a);
    color: white;
    font-weight: 600;
    cursor: pointer;
}

.ogrenci-list {
    margin-top: 16px;
    max-height: 480px;
    overflow-y: auto;
}

.ogrenci-list ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.ogrenci-list li {
    margin-bottom: 6px;
}

.ogrenci-list a {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 8px 10px;
    border-radius: 10px;
    background: rgba(15,23,42,0.9);
    border: 1px solid transparent;
    font-size: 13px;
}

.ogrenci-list a:hover {
    border-color: rgba(96,165,250,0.9);
    background: rgba(30,64,175,0.4);
}

/* Main panel */

.main-panel {
    background: radial-gradient(circle at top left, rgba(37,99,235,0.25), transparent),
                radial-gradient(circle at bottom right, rgba(236,72,153,0.2), transparent),
                #020617;
    border-radius: 16px;
    padding: 18px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.6);
    border: 1px solid rgba(148,163,184,0.35);
    min-height: 500px;
}

.empty-state {
    text-align: center;
    margin-top: 120px;
}

.empty-state h2 {
    font-size: 22px;
    margin-bottom: 4px;
}

.empty-state p {
    font-size: 14px;
    color: #9ca3af;
}

.student-header {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

.student-photo img {
    width: 150px;
    height: 180px;
    object-fit: cover;
    border-radius: 12px;
    border: 2px solid rgba(148,163,184,0.7);
    background: #020617;
}

.no-photo {
    width: 150px;
    height: 180px;
    border-radius: 12px;
    border: 2px dashed rgba(148,163,184,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    color: #9ca3af;
}

.student-info h2 {
    margin: 0 0 6px;
    font-size: 20px;
}

.student-info p {
    margin: 2px 0;
    font-size: 13px;
}

/* cards */

.cards-row {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 14px;
    margin-bottom: 16px;
}

.card {
    background: rgba(15,23,42,0.92);
    border-radius: 14px;
    padding: 12px 14px;
    border: 1px solid rgba(148,163,184,0.4);
}

.card h3 {
    margin: 0 0 6px;
    font-size: 15px;
}

.card.full-width {
    grid-column: 1 / -1;
}

/* tables */

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
}

th, td {
    padding: 6px 8px;
    border-bottom: 1px solid rgba(30,64,175,0.5);
}

th {
    text-align: left;
    background: rgba(15,23,42,0.9);
    position: sticky;
    top: 0;
}

.mini-table {
    max-height: 200px;
    overflow-y: auto;
}

/* Admin */

.admin-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 18px;
    background: linear-gradient(90deg, #1d4ed8, #7c3aed);
}

.admin-container {
    padding: 16px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 14px;
}

.admin-card {
    background: rgba(15,23,42,0.96);
    padding: 14px;
    border-radius: 14px;
    border: 1px solid rgba(148,163,184,0.5);
    font-size: 13px;
}

.admin-card h2 {
    margin-top: 0;
    margin-bottom: 6px;
    font-size: 16px;
}

.btn, .btn-logout {
    display: inline-block;
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(15,23,42,0.2);
    border: 1px solid rgba(226,232,240,0.8);
    color: #e5e7eb;
    font-size: 13px;
}

.btn-logout {
    background: rgba(220,38,38,0.9);
    border-color: rgba(248,113,113,1);
}

/* Auth */

.auth-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.auth-box {
    background: rgba(15,23,42,0.96);
    padding: 24px;
    border-radius: 16px;
    width: 320px;
    border: 1px solid rgba(148,163,184,0.5);
}

.auth-box h2 {
    margin-top: 0;
}

.auth-box label {
    display: block;
    margin: 8px 0 4px;
    font-size: 13px;
}

.auth-box input {
    width: 100%;
    padding: 8px 10px;
    border-radius: 10px;
    border: 1px solid rgba(148,163,184,0.5);
    background: rgba(15,23,42,0.9);
    color: #e5e7eb;
}

/* Forms */

.upload-form, .settings-form {
    background: rgba(15,23,42,0.96);
    padding: 16px;
    border-radius: 14px;
    border: 1px solid rgba(148,163,184,0.5);
}

.upload-form label,
.settings-form label {
    display: block;
    margin-bottom: 4px;
    font-size: 13px;
}

.upload-form input[type="file"],
.settings-form input[type="text"] {
    width: 100%;
    padding: 8px 10px;
    border-radius: 10px;
    border: 1px solid rgba(148,163,184,0.5);
    background: rgba(15,23,42,0.9);
    color: #e5e7eb;
}

.upload-form button,
.settings-form button,
.auth-box button {
    margin-top: 10px;
    width: 100%;
    padding: 9px;
    border-radius: 999px;
    border: none;
    background: linear-gradient(90deg, #22c55e, #16a34a);
    color: white;
    font-weight: 600;
    cursor: pointer;
}

/* Messages */

.error {
    background: rgba(248,113,113,0.15);
    border: 1px solid rgba(248,113,113,0.6);
    padding: 8px 10px;
    border-radius: 10px;
    font-size: 13px;
    margin-bottom: 8px;
}

.success, .info {
    background: rgba(34,197,94,0.15);
    border: 1px solid rgba(34,197,94,0.6);
    padding: 8px 10px;
    border-radius: 10px;
    font-size: 13px;
    margin-bottom: 8px;
}