:root {
    --yellow: #f5e432;
    --yellow-dark: #e6d420;
    --black: #0a0a0a;
    --dark: #1a1a1a;
    --gray-900: #222222;
    --gray-700: #555555;
    --gray-500: #888888;
    --gray-300: #d4d4d4;
    --gray-100: #f5f5f5;
    --gray-50: #fafafa;
    --white: #ffffff;
    --success: #10b981;
    --danger: #ef4444;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Inter', system-ui, sans-serif;
    background: var(--gray-50);
    color: var(--black);
    -webkit-font-smoothing: antialiased;
}

/* ===== Login ===== */
.login-screen {
    min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--black) 0%, var(--gray-900) 100%);
    padding: 20px;
}
.login-box {
    background: var(--white);
    border-radius: 20px;
    padding: 48px 40px;
    text-align: center;
    max-width: 400px; width: 100%;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.login-logo {
    width: 80px; height: 80px;
    border-radius: 16px;
    margin: 0 auto 20px;
    object-fit: cover;
}
.login-box h1 {
    font-size: 32px; font-weight: 900;
    letter-spacing: -1px;
    margin-bottom: 4px;
}
.login-box > p {
    color: var(--gray-500);
    margin-bottom: 32px;
    font-size: 14px;
}
.login-box input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--gray-100);
    border-radius: 10px;
    font-family: inherit; font-size: 15px;
    background: var(--gray-50);
    margin-bottom: 12px;
    transition: 0.2s;
}
.login-box input:focus { outline: none; border-color: var(--yellow); background: var(--white); }
.login-box small { display: block; margin-top: 16px; color: var(--gray-500); font-size: 12px; }
.login-box code { background: var(--gray-100); padding: 2px 6px; border-radius: 4px; font-family: monospace; }

/* ===== Layout ===== */
.admin-panel {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    background: var(--black);
    color: var(--white);
    padding: 24px 16px;
    display: flex; flex-direction: column;
    position: sticky; top: 0;
    height: 100vh;
}
.sidebar-head {
    display: flex; align-items: center; gap: 12px;
    padding: 0 8px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    margin-bottom: 16px;
}
.sidebar-head img { width: 44px; height: 44px; border-radius: 10px; }
.sidebar-head strong { display: block; font-size: 16px; font-weight: 800; letter-spacing: -0.5px; }
.sidebar-head small { font-size: 11px; color: var(--gray-500); letter-spacing: 1px; text-transform: uppercase; }

.sidebar-nav { display: flex; flex-direction: column; gap: 4px; flex: 1; }
.tab-btn {
    background: transparent; color: var(--white);
    border: none; padding: 12px 16px;
    border-radius: 10px;
    font-family: inherit; font-size: 14px;
    text-align: left;
    cursor: pointer;
    display: flex; align-items: center; gap: 12px;
    transition: 0.2s;
}
.tab-btn:hover { background: rgba(255,255,255,0.05); }
.tab-btn.active { background: var(--yellow); color: var(--black); font-weight: 700; }
.tab-btn i { width: 18px; text-align: center; }

.sidebar-foot {
    padding-top: 16px;
    border-top: 1px solid rgba(255,255,255,0.1);
    display: flex; flex-direction: column; gap: 4px;
}
.sidebar-foot a, .sidebar-foot button {
    background: transparent; color: var(--gray-500);
    border: none; padding: 12px 16px;
    border-radius: 10px;
    font-family: inherit; font-size: 13px;
    text-align: left; text-decoration: none;
    cursor: pointer;
    display: flex; align-items: center; gap: 12px;
    transition: 0.2s;
}
.sidebar-foot a:hover, .sidebar-foot button:hover { background: rgba(255,255,255,0.05); color: var(--white); }

/* Main Content */
.main-content {
    padding: 32px 40px;
    overflow-x: hidden;
}
.tab-content { display: none; }
.tab-content.active { display: block; animation: fadeIn 0.3s; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.tab-head {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 28px;
    flex-wrap: wrap; gap: 16px;
}
.tab-head h2 {
    font-size: 26px; font-weight: 800;
    display: flex; align-items: center; gap: 12px;
    letter-spacing: -0.5px;
}
.tab-head h2 i { color: var(--yellow); }
.tab-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 18px;
    font-family: inherit; font-size: 13px; font-weight: 600;
    border: none; border-radius: 10px;
    cursor: pointer;
    transition: 0.2s;
}
.btn-primary { background: var(--black); color: var(--white); }
.btn-primary:hover { background: var(--yellow); color: var(--black); }
.btn-success { background: var(--success); color: var(--white); }
.btn-success:hover { opacity: 0.9; }
.btn-outline { background: transparent; color: var(--gray-700); border: 2px solid var(--gray-300); }
.btn-outline:hover { border-color: var(--black); color: var(--black); }
.btn-danger { background: transparent; color: var(--danger); border: 1px solid #fecaca; padding: 8px 12px; font-size: 12px; }
.btn-danger:hover { background: var(--danger); color: var(--white); border-color: var(--danger); }
.btn-sm { padding: 6px 12px; font-size: 12px; }

/* Items */
.items-list { display: flex; flex-direction: column; gap: 12px; }
.item-card {
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: 12px;
    padding: 16px;
    display: flex; align-items: center; gap: 16px;
    transition: 0.2s;
}
.item-card:hover { box-shadow: var(--shadow-md); }
.item-img {
    width: 64px; height: 64px;
    border-radius: 10px;
    object-fit: cover;
    background: var(--gray-100);
    flex-shrink: 0;
}
.item-info { flex: 1; min-width: 0; }
.item-info strong { display: block; font-size: 15px; font-weight: 700; margin-bottom: 2px; }
.item-info span { display: block; font-size: 13px; color: var(--gray-500); }
.item-info .badge {
    display: inline-block;
    background: var(--yellow); color: var(--black);
    padding: 2px 8px; border-radius: 100px;
    font-size: 11px; font-weight: 700;
    margin-top: 6px;
}
.item-info .stars { color: var(--yellow); font-size: 12px; margin-top: 4px; }
.item-actions { display: flex; gap: 6px; flex-shrink: 0; }

/* Submissions */
.submissions-list { display: flex; flex-direction: column; gap: 12px; }
.submission-card {
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: 12px;
    padding: 20px;
}
.submission-head {
    display: flex; justify-content: space-between; align-items: start;
    margin-bottom: 12px;
    flex-wrap: wrap; gap: 8px;
}
.submission-name { font-size: 16px; font-weight: 700; }
.submission-date { font-size: 12px; color: var(--gray-500); }
.submission-data { display: flex; gap: 24px; flex-wrap: wrap; font-size: 14px; color: var(--gray-700); }
.submission-data span { display: flex; align-items: center; gap: 6px; }
.submission-data i { color: var(--yellow); }

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--gray-500);
}
.empty-state i { font-size: 48px; margin-bottom: 16px; opacity: 0.3; }

/* Help */
.help-card {
    background: var(--white);
    border-radius: 16px;
    padding: 40px;
    max-width: 800px;
    box-shadow: var(--shadow-sm);
}
.help-card h2 {
    font-size: 24px; font-weight: 800;
    margin-bottom: 24px;
    display: flex; align-items: center; gap: 10px;
}
.help-card h2 i { color: var(--yellow); }
.help-card h3 {
    font-size: 17px; font-weight: 700;
    margin: 24px 0 12px;
}
.help-card p, .help-card li {
    color: var(--gray-700);
    line-height: 1.7;
    margin-bottom: 8px;
}
.help-card ul, .help-card ol { padding-left: 24px; margin-bottom: 16px; }
.help-card code { background: var(--gray-100); padding: 2px 6px; border-radius: 4px; font-family: monospace; font-size: 13px; }

/* Modal */
.modal {
    position: fixed; inset: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(6px);
    display: none; align-items: center; justify-content: center;
    z-index: 9999;
    padding: 20px;
}
.modal.active { display: flex; }
.modal-content {
    background: var(--white);
    border-radius: 16px;
    padding: 32px;
    max-width: 500px; width: 100%;
    max-height: 90vh; overflow-y: auto;
    position: relative;
}
.modal-content h3 { font-size: 22px; font-weight: 800; margin-bottom: 24px; padding-right: 30px; }
.modal-close {
    position: absolute; top: 16px; right: 20px;
    background: none; border: none;
    font-size: 28px; cursor: pointer;
    color: var(--gray-500);
}
.modal-close:hover { color: var(--black); }
.modal-field { margin-bottom: 16px; }
.modal-field label {
    display: block;
    font-size: 13px; font-weight: 600;
    margin-bottom: 6px;
    color: var(--gray-700);
}
.modal-field input, .modal-field textarea, .modal-field select {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid var(--gray-100);
    border-radius: 10px;
    font-family: inherit; font-size: 14px;
    background: var(--gray-50);
    transition: 0.2s;
    resize: vertical;
}
.modal-field input:focus, .modal-field textarea:focus, .modal-field select:focus {
    outline: none; border-color: var(--yellow); background: var(--white);
}
.modal-field textarea { min-height: 100px; }
.modal-field small { display: block; font-size: 11px; color: var(--gray-500); margin-top: 4px; }
.modal-actions {
    display: flex; gap: 10px; justify-content: flex-end;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--gray-100);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px; right: 24px;
    background: var(--black);
    color: var(--white);
    padding: 14px 20px;
    border-radius: 10px;
    font-size: 14px; font-weight: 500;
    box-shadow: var(--shadow-md);
    transform: translateY(100px);
    opacity: 0;
    transition: 0.3s;
    z-index: 99999;
    display: flex; align-items: center; gap: 10px;
}
.toast.active { transform: translateY(0); opacity: 1; }
.toast i { color: var(--success); }
.toast.error i { color: var(--danger); }

/* Responsive */
@media (max-width: 900px) {
    .admin-panel { grid-template-columns: 1fr; }
    .sidebar {
        position: relative; height: auto;
        flex-direction: row; flex-wrap: wrap;
        padding: 16px;
    }
    .sidebar-head { width: 100%; padding-bottom: 16px; }
    .sidebar-nav { flex-direction: row; flex: 1; flex-wrap: wrap; }
    .tab-btn { flex: 1; min-width: 130px; justify-content: center; }
    .sidebar-foot { width: 100%; flex-direction: row; }
    .sidebar-foot a, .sidebar-foot button { flex: 1; justify-content: center; }
    .main-content { padding: 20px; }
}
@media (max-width: 500px) {
    .item-card { flex-wrap: wrap; }
    .item-actions { width: 100%; }
    .item-actions .btn { flex: 1; justify-content: center; }
}