/* admin.css */
:root {
    --bg: #fafaf9;
    --surface: #ffffff;
    --border: #e7e5e4;
    --text: #1c1917;
    --text-muted: #78716c;
    --accent: #2563eb;
    --danger: #dc2626;
    --success: #16a34a;
    --warning: #eab308;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: var(--bg); color: var(--text);
    line-height: 1.5;
}
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

.admin-header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    position: sticky; top: 0; z-index: 50;
}
.admin-header .container {
    display: flex; justify-content: space-between; align-items: center;
}
.admin-header h1 { font-size: 1.1rem; }
.admin-header nav { display: flex; gap: 16px; }
.admin-header nav a {
    color: var(--text-muted); text-decoration: none;
    font-size: .9rem;
}
.admin-header nav a:hover { color: var(--text); }

.admin-body { padding: 32px 24px; }

.login-box {
    max-width: 400px; margin: 80px auto;
    background: var(--surface); padding: 32px;
    border-radius: 12px; border: 1px solid var(--border);
    box-shadow: 0 4px 12px rgba(0,0,0,.04);
}
.login-box h2 { margin-bottom: 8px; }
.login-box p { color: var(--text-muted); margin-bottom: 24px; font-size: .9rem; }
.login-box code { background: var(--bg); padding: 2px 6px; border-radius: 4px; font-size: .85rem; }
.login-box input {
    width: 100%; padding: 10px 12px;
    border: 1px solid var(--border); border-radius: 8px;
    margin-bottom: 12px; font-size: .95rem;
}
.login-box button {
    width: 100%; padding: 10px;
    background: var(--text); color: white;
    border: none; border-radius: 8px;
    font-weight: 600; cursor: pointer;
}
.login-box button:hover { background: #000; }

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 20px;
}
.card h2 { font-size: 1.05rem; margin-bottom: 16px; }

.notice, .error {
    padding: 12px 16px; border-radius: 8px; margin-bottom: 16px;
    font-size: .9rem;
}
.notice { background: #d1fae5; color: #065f46; }
.error { background: #fee2e2; color: #991b1b; }

.inline-form { display: flex; gap: 8px; align-items: center; }
.inline-form input, .inline-form button {
    padding: 8px 12px; border-radius: 6px; font-size: .9rem;
}
.inline-form input {
    border: 1px solid var(--border); flex: 1;
}
.inline-form button {
    background: var(--text); color: white; border: none;
    cursor: pointer; font-weight: 600;
}

.hint { font-size: .8rem; color: var(--text-muted); margin-top: 8px; }
.hint a { color: var(--accent); }

.event-form { display: flex; flex-direction: column; gap: 12px; }
.event-form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.event-form label {
    display: flex; flex-direction: column; gap: 4px;
    font-size: .85rem; color: var(--text-muted); font-weight: 500;
}
.event-form input, .event-form select, .event-form textarea {
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: .9rem;
    color: var(--text);
    font-family: inherit;
}
.event-form input:focus, .event-form select:focus, .event-form textarea:focus {
    outline: none; border-color: var(--accent);
}
.form-actions { display: flex; gap: 8px; margin-top: 8px; }
.form-actions button.primary {
    padding: 10px 20px; background: var(--accent); color: white;
    border: none; border-radius: 8px; cursor: pointer; font-weight: 600;
}
.form-actions .btn {
    padding: 10px 20px; border: 1px solid var(--border);
    border-radius: 8px; text-decoration: none; color: var(--text);
    background: var(--surface);
}

.events-table {
    width: 100%; border-collapse: collapse;
    font-size: .875rem;
}
.events-table th, .events-table td {
    padding: 10px 8px; text-align: left;
    border-bottom: 1px solid var(--border);
}
.events-table th {
    background: var(--bg); font-weight: 600;
    font-size: .8rem; text-transform: uppercase;
    letter-spacing: .03em; color: var(--text-muted);
}
.events-table small { color: var(--text-muted); font-size: .75rem; }
.events-table .actions { display: flex; gap: 6px; }
.events-table .actions a {
    color: var(--accent); text-decoration: none;
    font-size: 1rem;
}
.events-table .actions button {
    background: none; border: none; cursor: pointer;
    font-size: 1rem;
}

.status-badge {
    display: inline-block;
    padding: 2px 8px; border-radius: 999px;
    font-size: .7rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: .03em;
}
.status-chua-dang-ky { background: #fef3c7; color: #92400e; }
.status-da-dang-ky { background: #dbeafe; color: #1e40af; }
.status-da-tham-du { background: #d1fae5; color: #065f46; }
.status-bo-qua { background: #f3f4f6; color: #6b7280; }
.status-pending-review { background: #fde68a; color: #78350f; }

@media (max-width: 640px) {
    .event-form .row { grid-template-columns: 1fr; }
    .events-table { font-size: .8rem; }
    .events-table th:nth-child(4), .events-table td:nth-child(4),
    .events-table th:nth-child(6), .events-table td:nth-child(6) { display: none; }
}