:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --success: #16a34a;
    --danger: #dc2626;
    --bg: #f5f6fb;
    --card-bg: #ffffff;
    --text: #1f2333;
    --text-light: #6b7280;
    --border: #e5e7eb;
    --radius: 12px;
    --shadow: 0 2px 8px rgba(0,0,0,0.06);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
}

/* ---------- Navbar ---------- */
.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--card-bg);
    padding: 14px 28px;
    box-shadow: var(--shadow);
    flex-wrap: wrap;
    gap: 12px;
}
.navbar-brand { font-size: 20px; font-weight: 700; color: var(--primary); }
.navbar-brand span { color: var(--text); }
.navbar-links { display: flex; gap: 20px; }
.navbar-links a { color: var(--text-light); text-decoration: none; font-weight: 500; }
.navbar-links a:hover { color: var(--primary); }
.navbar-user { display: flex; align-items: center; gap: 12px; }

/* ---------- Layout ---------- */
.container { max-width: 1100px; margin: 0 auto; padding: 28px 20px; }
.page-header { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 16px; margin-bottom: 20px; }
.page-title { margin: 0 0 4px; font-size: 26px; }
.page-subtitle { margin: 0; color: var(--text-light); }
.page-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-block;
    padding: 10px 18px;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s ease;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-block { width: 100%; text-align: center; }
.btn-sm { padding: 6px 12px; font-size: 13px; }

/* ---------- Forms ---------- */
.form { display: flex; flex-direction: column; gap: 6px; }
.form label { font-size: 13px; font-weight: 600; color: var(--text-light); margin-top: 8px; }
.form input, .form textarea, .form select {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    width: 100%;
    background: #fafafa;
}
.form input:focus, .form textarea:focus { outline: none; border-color: var(--primary); background: #fff; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
@media (max-width: 600px) { .form-grid { grid-template-columns: 1fr; } }

/* ---------- Auth Page ---------- */
.auth-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: linear-gradient(135deg, #4f46e5, #7c3aed); }
.auth-card { background: #fff; padding: 40px; border-radius: var(--radius); box-shadow: var(--shadow); width: 100%; max-width: 380px; }
.brand { text-align: center; color: var(--primary); margin-bottom: 4px; }
.brand span { color: var(--text); }
.subtitle { text-align: center; color: var(--text-light); margin-bottom: 20px; }
.hint { text-align: center; font-size: 12px; color: var(--text-light); margin-top: 16px; }

/* ---------- Alerts ---------- */
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; }
.alert-success { background: #dcfce7; color: #166534; }
.alert-error { background: #fee2e2; color: #991b1b; }

/* ---------- Scan Page ---------- */
.scan-card { background: var(--card-bg); border-radius: var(--radius); box-shadow: var(--shadow); padding: 28px; max-width: 640px; margin: 0 auto; }
.upload-zone { border: 2px dashed var(--border); border-radius: var(--radius); padding: 40px 20px; text-align: center; margin-bottom: 16px; }
.upload-icon { font-size: 48px; margin-bottom: 10px; }
.preview-img { max-width: 100%; border-radius: 8px; margin-top: 10px; }
.loading { display: flex; align-items: center; gap: 10px; justify-content: center; padding: 20px; color: var(--text-light); }
.spinner { width: 20px; height: 20px; border: 3px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Table ---------- */
.search-bar { display: flex; gap: 10px; margin-bottom: 16px; }
.search-bar input { flex: 1; padding: 10px 14px; border-radius: 8px; border: 1px solid var(--border); }
.table-wrap { background: var(--card-bg); border-radius: var(--radius); box-shadow: var(--shadow); overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; }
.data-table th, .data-table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; }
.data-table th { background: #f9fafb; color: var(--text-light); font-weight: 600; }
.thumb { width: 48px; height: 34px; object-fit: cover; border-radius: 4px; }
.empty-state { text-align: center; padding: 30px; color: var(--text-light); }

/* ---------- Modal ---------- */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center; z-index: 100; }
.modal-box { background: #fff; padding: 24px; border-radius: var(--radius); width: 90%; max-width: 420px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 16px; }

/* ---------- Stat Cards (Admin) ---------- */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { background: var(--card-bg); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; }
.stat-card .value { font-size: 28px; font-weight: 700; color: var(--primary); }
.stat-card .label { color: var(--text-light); font-size: 13px; }