/* ============================================================
   Airport Exams – Global Stylesheet v2
   ============================================================ */

:root {
    --primary:     #667eea;
    --primary-dark:#764ba2;
    --success:     #28a745;
    --danger:      #dc3545;
    --warning:     #fd7e14;
    --info:        #17a2b8;
    --gray-light:  #f5f7fa;
    --gray-border: #e0e0e0;
    --text:        #333;
    --text-muted:  #888;
    --sidebar-w:   260px;
    --radius:      12px;
    --shadow:      0 2px 15px rgba(0,0,0,.09);
}

*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--gray-light);
    color: var(--text);
    font-size: 14px;
}

/* ── Sidebar ─────────────────────────────────────────────── */
.sidebar {
    width: var(--sidebar-w);
    background: linear-gradient(180deg, var(--primary), var(--primary-dark));
    color: #fff;
    min-height: 100vh;
    padding: 20px;
    position: fixed;
    top: 0; left: 0;
    overflow-y: auto;
    z-index: 100;
}
.sidebar-header { padding: 18px 0; border-bottom: 1px solid rgba(255,255,255,.2); margin-bottom: 24px; }
.sidebar-header h1 { font-size: 20px; }
.sidebar-header p  { font-size: 12px; opacity: .8; margin-top: 4px; }
.sidebar-menu { list-style: none; }
.sidebar-menu li { margin-bottom: 3px; }
.sidebar-menu a {
    display: flex; align-items: center; gap: 10px;
    padding: 11px 14px; color: #fff; text-decoration: none;
    border-radius: 8px; transition: background .2s; font-size: 14px;
}
.sidebar-menu a:hover,
.sidebar-menu a.active { background: rgba(255,255,255,.22); }
.sidebar-menu .badge-count {
    margin-left: auto; background: var(--danger); color: #fff;
    border-radius: 10px; padding: 2px 7px; font-size: 11px; font-weight: 700;
}

/* ── Main layout ─────────────────────────────────────────── */
.layout { display: flex; }
.main-content { flex: 1; margin-left: var(--sidebar-w); padding: 28px; min-height: 100vh; }

/* ── Top-bar ─────────────────────────────────────────────── */
.top-bar {
    background: #fff; padding: 18px 26px; border-radius: var(--radius);
    margin-bottom: 26px; box-shadow: var(--shadow);
    display: flex; justify-content: space-between; align-items: center;
}
.top-bar h2 { font-size: 20px; }

/* ── Cards ───────────────────────────────────────────────── */
.card {
    background: #fff; border-radius: var(--radius);
    box-shadow: var(--shadow); margin-bottom: 24px; overflow: hidden;
}
.card-header {
    padding: 18px 24px; border-bottom: 2px solid #f0f0f0;
    display: flex; justify-content: space-between; align-items: center;
}
.card-header h3, .card-header h2 { font-size: 17px; color: var(--text); }
.card-body { padding: 24px; }

/* ── Stats grid ──────────────────────────────────────────── */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(220px,1fr)); gap: 18px; margin-bottom: 26px; }
.stat-card {
    background: #fff; padding: 22px; border-radius: var(--radius);
    box-shadow: var(--shadow); position: relative; overflow: hidden; cursor: default;
}
.stat-card::before { content:''; position:absolute; top:0; left:0; width:5px; height:100%; }
.stat-card.blue::before   { background: var(--primary); }
.stat-card.green::before  { background: var(--success); }
.stat-card.orange::before { background: var(--warning); }
.stat-card.purple::before { background: var(--primary-dark); }
.stat-card.red::before    { background: var(--danger); }
.stat-label  { color: var(--text-muted); font-size: 13px; margin-bottom: 8px; }
.stat-value  { font-size: 30px; font-weight: 700; color: var(--text); }

/* ── Alerts ──────────────────────────────────────────────── */
.alert { padding: 13px 17px; border-radius: 8px; margin-bottom: 20px; font-weight: 500; }
.alert-success { background: #d4edda; color: #155724; border-left: 4px solid var(--success); }
.alert-error   { background: #f8d7da; color: #721c24; border-left: 4px solid var(--danger);  }
.alert-warning { background: #fff3cd; color: #856404; border-left: 4px solid var(--warning); }
.alert-info    { background: #d1ecf1; color: #0c5460; border-left: 4px solid var(--info);    }

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 9px 18px; border: none; border-radius: 7px;
    font-size: 14px; font-weight: 600; cursor: pointer;
    text-decoration: none; transition: all .2s;
}
.btn:hover { transform: translateY(-1px); opacity: .9; }
.btn-primary   { background: linear-gradient(135deg,var(--primary),var(--primary-dark)); color: #fff; }
.btn-success   { background: var(--success);  color: #fff; }
.btn-danger    { background: var(--danger);   color: #fff; }
.btn-warning   { background: var(--warning);  color: #fff; }
.btn-secondary { background: #6c757d;         color: #fff; }
.btn-info      { background: var(--info);     color: #fff; }
.btn-sm        { padding: 6px 12px; font-size: 12px; }
.btn-xs        { padding: 4px 9px;  font-size: 11px; }
.btn:disabled  { opacity: .5; cursor: not-allowed; transform: none; }

/* ── Badges ──────────────────────────────────────────────── */
.badge { display: inline-block; padding: 4px 12px; border-radius: 20px; font-size: 12px; font-weight: 600; }
.badge-success   { background: #d4edda; color: #155724; }
.badge-danger    { background: #f8d7da; color: #721c24; }
.badge-warning   { background: #fff3cd; color: #856404; }
.badge-info      { background: #d1ecf1; color: #0c5460; }
.badge-secondary { background: #e2e3e5; color: #383d41; }
.badge-primary   { background: #cce5ff; color: #004085; }

/* ── Forms ───────────────────────────────────────────────── */
.form-grid  { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { margin-bottom: 16px; }
.form-group.full { grid-column: 1/-1; }
label { display: block; margin-bottom: 6px; color: #444; font-weight: 500; }
label .req { color: var(--danger); }
input[type=text], input[type=email], input[type=password], input[type=tel],
input[type=date], input[type=time], input[type=number], select, textarea {
    width: 100%; padding: 10px 13px; border: 2px solid var(--gray-border);
    border-radius: 7px; font-size: 14px; transition: border-color .2s;
    font-family: inherit;
}
input:focus, select:focus, textarea:focus {
    outline: none; border-color: var(--primary);
}
input[readonly], input[disabled] { background: #f8f9fa; color: #999; }
textarea { resize: vertical; min-height: 80px; }
.checkbox-row { display: flex; align-items: center; gap: 8px; }
.checkbox-row input[type=checkbox] { width: 17px; height: 17px; cursor: pointer; }

/* ── Tables / DataTables overrides ───────────────────────── */
.dt-wrapper { overflow-x: auto; }
table.dataTable thead th {
    background: #f8f9fa; font-size: 12px; font-weight: 600;
    color: var(--text-muted); text-transform: uppercase; letter-spacing: .4px;
}
table.dataTable tbody tr:hover { background: #f0f4ff !important; }
.dataTables_wrapper .dataTables_filter input {
    border: 2px solid var(--gray-border); border-radius: 7px; padding: 6px 12px;
}
.dataTables_wrapper .dataTables_length select {
    border: 2px solid var(--gray-border); border-radius: 7px; padding: 4px 8px;
}
.dataTables_wrapper .dataTables_paginate .paginate_button.current,
.dataTables_wrapper .dataTables_paginate .paginate_button.current:hover {
    background: var(--primary) !important; color: #fff !important;
    border-color: var(--primary) !important; border-radius: 6px;
}

/* ── Upload area ─────────────────────────────────────────── */
.upload-area {
    border: 2px dashed var(--primary); border-radius: 10px; padding: 30px;
    text-align: center; background: #f8f9ff; cursor: pointer; transition: .3s;
}
.upload-area:hover { background: #eef0ff; }
.upload-area.drag-over { background: #dde2ff; border-color: var(--primary-dark); }
.upload-area input[type=file] { display: none; }
.upload-area .icon { font-size: 36px; margin-bottom: 8px; }
.upload-area p { color: #555; font-size: 14px; }
.upload-area .hint { color: #999; font-size: 12px; margin-top: 4px; }

/* ── Progress bar ────────────────────────────────────────── */
.progress { height: 8px; background: #e9ecef; border-radius: 4px; overflow: hidden; }
.progress-bar { height: 100%; background: linear-gradient(90deg,var(--primary),var(--primary-dark)); transition: width .3s; }

/* ── Loading overlay ─────────────────────────────────────── */
#ajax-loader {
    display: none; position: fixed; inset: 0;
    background: rgba(255,255,255,.6); z-index: 9999;
    justify-content: center; align-items: center;
}
#ajax-loader.show { display: flex; }
.spinner {
    width: 44px; height: 44px; border: 4px solid #eee;
    border-top-color: var(--primary); border-radius: 50%;
    animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Toast notifications ─────────────────────────────────── */
#toast-container {
    position: fixed; top: 20px; right: 20px;
    z-index: 10000; display: flex; flex-direction: column; gap: 10px;
}
.toast {
    padding: 14px 20px; border-radius: 10px; color: #fff;
    font-weight: 600; box-shadow: 0 4px 20px rgba(0,0,0,.2);
    animation: slideIn .3s ease; min-width: 280px;
}
.toast.success { background: var(--success); }
.toast.error   { background: var(--danger); }
.toast.warning { background: var(--warning); }
.toast.info    { background: var(--primary); }
@keyframes slideIn { from { transform: translateX(120%); opacity:0; } to { transform: translateX(0); opacity:1; } }

/* ── Modal ───────────────────────────────────────────────── */
.modal-overlay {
    display: none; position: fixed; inset: 0;
    background: rgba(0,0,0,.5); z-index: 1050;
    justify-content: center; align-items: center;
}
.modal-overlay.show { display: flex; }
.modal-box {
    background: #fff; border-radius: var(--radius);
    padding: 32px; max-width: 540px; width: 90%;
    box-shadow: 0 20px 60px rgba(0,0,0,.3); position: relative;
}
.modal-title  { font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.modal-body   { color: #555; margin-bottom: 22px; }
.modal-footer { display: flex; gap: 10px; justify-content: flex-end; }
.modal-close  { position: absolute; top: 14px; right: 18px; font-size: 20px; cursor: pointer; color: #999; }

/* ── Navbar (frontend) ───────────────────────────────────── */
.navbar {
    background: linear-gradient(135deg,var(--primary),var(--primary-dark));
    color: #fff; padding: 15px 30px;
    display: flex; justify-content: space-between; align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,.1);
}
.navbar h1 { font-size: 22px; }
.navbar a { color: #fff; text-decoration: none; padding: 8px 14px; border-radius: 6px; transition: .2s; }
.navbar a:hover { background: rgba(255,255,255,.2); }
.navbar-right { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 768px) {
    .sidebar  { position: relative; width: 100%; min-height: auto; }
    .main-content { margin-left: 0; padding: 18px; }
    .form-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .navbar { flex-direction: column; gap: 10px; }
    .navbar-right { justify-content: center; }
}
@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
}