/* ============================================================
   TutorCentral Admin — admin.css
   Deep Navy #0a1f44  |  Gold #c9a84c
   ============================================================ */

/* ── Reset & base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --navy:       #0a1f44;
    --navy-dark:  #061630;
    --navy-mid:   #122a5a;
    --gold:       #c9a84c;
    --gold-light: #e2c078;
    --gold-pale:  #f7f0dc;
    --bg:         #f4f6f9;
    --white:      #ffffff;
    --text:       #1a1a2e;
    --text-muted: #6b7280;
    --border:     #dde2ec;
    --success:    #2e7d32;
    --success-bg: #e8f5e9;
    --warning:    #e65100;
    --warning-bg: #fff3e0;
    --danger:     #c62828;
    --danger-bg:  #ffebee;
    --sidebar-w:  240px;
    --topbar-h:   56px;
    --radius:     8px;
    --shadow:     0 1px 4px rgba(0,0,0,.08);
    --shadow-md:  0 4px 16px rgba(0,0,0,.12);
}

html, body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 15px;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
}

a { color: var(--gold); text-decoration: none; }
a:hover { color: var(--gold-light); }

/* ── Layout ───────────────────────────────────────────────── */
.topbar {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--topbar-h);
    background: var(--navy);
    color: var(--white);
    align-items: center;
    padding: 0 16px;
    z-index: 200;
    gap: 12px;
}

.topbar-logo { display: flex; align-items: center; gap: 8px; flex: 1; }
.topbar-title { font-weight: 700; font-size: 16px; color: var(--gold); }
.topbar-admin { font-size: 13px; color: rgba(255,255,255,.65); }

.burger {
    background: none; border: none; cursor: pointer;
    display: flex; flex-direction: column; gap: 5px; padding: 4px;
}
.burger span {
    display: block; width: 22px; height: 2px;
    background: var(--white); border-radius: 2px;
}

.sidebar {
    position: fixed;
    top: 0; left: 0;
    width: var(--sidebar-w);
    height: 100vh;
    background: var(--navy);
    display: flex;
    flex-direction: column;
    z-index: 300;
    transition: transform .25s ease;
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.45);
    z-index: 250;
}
.sidebar-overlay.show { display: block; }

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 24px 20px 20px;
    border-bottom: 1px solid rgba(255,255,255,.08);
}

.logo-mark {
    width: 40px; height: 40px;
    background: var(--gold);
    color: var(--navy);
    font-weight: 900;
    font-size: 16px;
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}

.logo-mark-sm {
    width: 30px; height: 30px;
    background: var(--gold);
    color: var(--navy);
    font-weight: 900;
    font-size: 13px;
    border-radius: 6px;
    display: flex; align-items: center; justify-content: center;
}

.sidebar-brand { color: var(--white); font-weight: 700; font-size: 15px; }
.sidebar-sub   { color: var(--gold);  font-size: 11px; text-transform: uppercase; letter-spacing: .5px; }

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 14px;
    border-radius: var(--radius);
    color: rgba(255,255,255,.75);
    font-size: 14px;
    font-weight: 500;
    transition: background .15s, color .15s;
}
.nav-item:hover { background: rgba(255,255,255,.08); color: var(--white); }
.nav-item.active { background: var(--gold); color: var(--navy); font-weight: 700; }
.nav-icon { font-size: 16px; width: 20px; text-align: center; }

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid rgba(255,255,255,.08);
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: rgba(255,255,255,.55);
    font-size: 13px;
}
.logout-link { color: var(--gold); font-size: 13px; }
.logout-link:hover { color: var(--gold-light); }

.main-content {
    margin-left: var(--sidebar-w);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.page-header {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 20px 28px;
}
.page-title { font-size: 22px; font-weight: 700; color: var(--navy); }

.page-body { padding: 24px 28px; flex: 1; }

/* ── Cards ────────────────────────────────────────────────── */
.card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px 24px;
    margin-bottom: 20px;
}
.card-title {
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .5px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

/* ── Stat cards ───────────────────────────────────────────── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}
.stat-card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    border-left: 4px solid var(--gold);
}
.stat-label { font-size: 12px; text-transform: uppercase; letter-spacing: .5px; color: var(--text-muted); margin-bottom: 8px; }
.stat-value { font-size: 28px; font-weight: 800; color: var(--navy); }
.stat-sub   { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* ── Tables ───────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; }
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}
th {
    text-align: left;
    padding: 10px 14px;
    background: var(--navy);
    color: var(--gold);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .4px;
    white-space: nowrap;
}
td {
    padding: 11px 14px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: #f8f9fc; }

/* ── Badges ───────────────────────────────────────────────── */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .3px;
}
.badge-success  { background: var(--success-bg); color: var(--success); }
.badge-warning  { background: var(--warning-bg); color: var(--warning); }
.badge-danger   { background: var(--danger-bg);  color: var(--danger);  }
.badge-navy     { background: var(--navy);        color: var(--gold);    }
.badge-gold     { background: var(--gold-pale);   color: #7a5c00;        }
.badge-muted    { background: var(--border);      color: var(--text-muted); }

/* ── Forms ────────────────────────────────────────────────── */
.form-group { margin-bottom: 18px; }
.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--navy);
    margin-bottom: 6px;
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 13px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    color: var(--text);
    background: var(--white);
    transition: border-color .15s;
    -webkit-appearance: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--gold);
    box-shadow: 0 0 0 3px rgba(201,168,76,.15);
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 20px; }
.form-hint { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 18px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: opacity .15s, transform .1s;
    white-space: nowrap;
}
.btn:active { transform: scale(.97); }
.btn-primary   { background: var(--navy);    color: var(--gold);  }
.btn-gold      { background: var(--gold);    color: var(--navy);  }
.btn-danger    { background: var(--danger);  color: var(--white); }
.btn-outline   { background: transparent; border: 1.5px solid var(--border); color: var(--text); }
.btn-sm        { padding: 6px 12px; font-size: 13px; }
.btn-full      { width: 100%; justify-content: center; padding: 12px; font-size: 15px; }
.btn:hover     { opacity: .88; }

/* ── Alerts ───────────────────────────────────────────────── */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    margin-bottom: 16px;
}
.alert-danger  { background: var(--danger-bg);  color: var(--danger);  border-left: 4px solid var(--danger); }
.alert-success { background: var(--success-bg); color: var(--success); border-left: 4px solid var(--success); }
.alert-warning { background: var(--warning-bg); color: var(--warning); border-left: 4px solid var(--warning); }

/* ── Checkbox ─────────────────────────────────────────────── */
.checkbox-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}
.checkbox-wrap input[type="checkbox"] {
    width: 18px; height: 18px;
    accent-color: var(--gold);
    cursor: pointer;
    flex-shrink: 0;
}

/* ── Login page ───────────────────────────────────────────── */
.login-page {
    background: var(--navy);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}
.login-wrap {
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    padding: 40px 36px;
    width: 100%;
    max-width: 400px;
}
.login-logo {
    text-align: center;
    margin-bottom: 32px;
}
.login-logo .logo-mark {
    margin: 0 auto 12px;
    width: 56px; height: 56px;
    font-size: 20px;
    border-radius: 12px;
}
.login-logo h1 { font-size: 22px; color: var(--navy); font-weight: 800; }
.login-logo p  { color: var(--text-muted); font-size: 13px; margin-top: 2px; }
.login-form .btn-full { margin-top: 8px; }

/* ── Filter bar ───────────────────────────────────────────── */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: flex-end;
    margin-bottom: 20px;
    background: var(--white);
    padding: 16px 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.filter-bar .form-group { margin-bottom: 0; }
.filter-bar label { font-size: 12px; }
.filter-bar select,
.filter-bar input { width: auto; min-width: 130px; }

/* ── Utility ──────────────────────────────────────────────── */
.mt-0  { margin-top: 0; }
.mt-8  { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.text-right  { text-align: right; }
.text-center { text-align: center; }
.text-muted  { color: var(--text-muted); font-size: 13px; }
.text-gold   { color: var(--gold); }
.text-navy   { color: var(--navy); }
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }
.flex         { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-gap     { gap: 12px; }
.d-none       { display: none; }

/* ── Mobile responsive ────────────────────────────────────── */
@media (max-width: 768px) {
    .topbar { display: flex; }

    .sidebar {
        transform: translateX(calc(-1 * var(--sidebar-w)));
    }
    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-md);
    }

    .main-content {
        margin-left: 0;
        padding-top: var(--topbar-h);
    }

    .page-header { padding: 16px 16px; }
    .page-title  { font-size: 18px; }
    .page-body   { padding: 16px; }

    .stats-grid  { grid-template-columns: 1fr 1fr; gap: 12px; }
    .stat-value  { font-size: 22px; }

    .form-grid   { grid-template-columns: 1fr; }

    .filter-bar  { flex-direction: column; align-items: stretch; }
    .filter-bar select,
    .filter-bar input { width: 100%; }

    table { font-size: 13px; }
    th, td { padding: 9px 10px; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
    .login-wrap { padding: 28px 20px; }
}