/* EduBridge portal styles — Facebook-blue identity, no build step required. */
:root {
    --primary: #1877F2;
    --primary-dark: #0E5ACB;
    --primary-light: #E7F0FF;
    --success: #22C55E;
    --warning: #F59E0B;
    --danger: #EF4444;
    --bg: #F5F7FA;
    --card: #FFFFFF;
    --text: #111827;
    --muted: #6B7280;
    --border: #E5E7EB;
    --radius: 10px;
    --sidebar-w: 240px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 15px;
    line-height: 1.5;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Guest (login/register) ---- */
.guest-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}
.guest-card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: 0 4px 24px rgba(17, 24, 39, .08);
    padding: 40px;
    width: 100%;
    max-width: 440px;
}
.guest-logo { text-align: center; margin-bottom: 8px; font-size: 28px; font-weight: 800; color: var(--primary); }
.guest-sub { text-align: center; color: var(--muted); margin-bottom: 28px; }

/* ---- App shell ---- */
.shell { display: flex; min-height: 100vh; }
.sidebar {
    width: var(--sidebar-w);
    background: #fff;
    border-right: 1px solid var(--border);
    padding: 20px 12px;
    position: fixed;
    top: 0; bottom: 0; left: 0;
    overflow-y: auto;
}
.sidebar .brand {
    font-size: 22px; font-weight: 800; color: var(--primary);
    padding: 4px 12px 18px;
    display: block;
}
.sidebar .nav-label { font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); padding: 14px 12px 6px; }
.sidebar a.nav-item {
    display: flex; align-items: center; gap: 10px;
    padding: 9px 12px; border-radius: 8px; color: var(--text);
    font-weight: 500; margin-bottom: 2px;
}
.sidebar a.nav-item:hover { background: var(--bg); text-decoration: none; }
.sidebar a.nav-item.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }
.sidebar .badge-count {
    margin-left: auto; background: var(--danger); color: #fff;
    font-size: 11px; font-weight: 700; border-radius: 999px; padding: 1px 7px;
}

.main { flex: 1; margin-left: var(--sidebar-w); padding: 28px 32px; max-width: calc(100vw - var(--sidebar-w)); }

.topbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; gap: 16px; flex-wrap: wrap; }
.topbar h1 { font-size: 22px; font-weight: 700; }
.topbar .user-chip { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 14px; }

/* ---- Cards & stats ---- */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 20px;
}
.card h2 { font-size: 16px; font-weight: 700; margin-bottom: 14px; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; margin-bottom: 24px; }
.stat {
    background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 18px;
}
.stat .stat-value { font-size: 26px; font-weight: 800; color: var(--primary); }
.stat .stat-label { color: var(--muted); font-size: 13px; margin-top: 2px; }
.stat.warn .stat-value { color: var(--warning); }

/* ---- Tables ---- */
.table-wrap { overflow-x: auto; }
table.table { width: 100%; border-collapse: collapse; background: var(--card); }
.table th, .table td { text-align: left; padding: 11px 12px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.table th { font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); font-weight: 600; }
.table tr:last-child td { border-bottom: 0; }
.table tr:hover td { background: #FAFBFC; }

/* ---- Badges ---- */
.badge { display: inline-block; padding: 2px 10px; font-size: 12px; font-weight: 600; border-radius: 999px; white-space: nowrap; }
.badge.blue { background: var(--primary-light); color: var(--primary-dark); }
.badge.green { background: #DCFCE7; color: #15803D; }
.badge.orange { background: #FEF3C7; color: #B45309; }
.badge.red { background: #FEE2E2; color: #B91C1C; }
.badge.gray { background: #F3F4F6; color: var(--muted); }

/* ---- Buttons ---- */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 9px 16px; border-radius: 8px; font-size: 14px; font-weight: 600;
    border: 1px solid transparent; cursor: pointer; background: var(--primary); color: #fff;
}
.btn:hover { background: var(--primary-dark); text-decoration: none; }
.btn.secondary { background: #fff; color: var(--text); border-color: var(--border); }
.btn.secondary:hover { background: var(--bg); }
.btn.success { background: var(--success); }
.btn.success:hover { background: #16A34A; }
.btn.warning { background: var(--warning); }
.btn.warning:hover { background: #D97706; }
.btn.danger { background: var(--danger); }
.btn.danger:hover { background: #DC2626; }
.btn.sm { padding: 5px 11px; font-size: 13px; }
.btn.block { width: 100%; justify-content: center; }
.btn:disabled { opacity: .6; cursor: not-allowed; }

/* ---- Forms ---- */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 5px; }
.form-group .hint { color: var(--muted); font-size: 13px; margin-top: 3px; }
input[type=text], input[type=email], input[type=password], input[type=number], input[type=date], input[type=url], input[type=tel], select, textarea {
    width: 100%; padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px;
    font-size: 14px; font-family: inherit; background: #fff; color: var(--text);
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary); outline-offset: -1px; border-color: var(--primary); }
.error-text { color: var(--danger); font-size: 13px; margin-top: 4px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 720px) { .form-row { grid-template-columns: 1fr; } }

/* ---- Filters ---- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; margin-bottom: 18px; }
.filter-bar .form-group { margin-bottom: 0; min-width: 160px; flex: 1; }
.filter-bar .form-group.grow { flex: 2; }

/* ---- Alerts ---- */
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 18px; font-weight: 500; }
.alert.success { background: #DCFCE7; color: #15803D; }
.alert.error { background: #FEE2E2; color: #B91C1C; }

/* ---- Teacher cards ---- */
.teacher-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.teacher-card {
    background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 18px; display: flex; flex-direction: column; gap: 8px;
}
.teacher-card .tc-head { display: flex; gap: 12px; align-items: center; }
.avatar {
    width: 52px; height: 52px; border-radius: 50%; background: var(--primary-light);
    color: var(--primary); display: inline-flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 19px; overflow: hidden; flex-shrink: 0;
}
.avatar img { width: 100%; height: 100%; object-fit: cover; }
.teacher-card .tc-name { font-weight: 700; }
.teacher-card .tc-meta { color: var(--muted); font-size: 13px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { background: var(--bg); border: 1px solid var(--border); border-radius: 999px; padding: 2px 10px; font-size: 12px; color: var(--text); }
.rating { color: var(--warning); font-weight: 700; font-size: 14px; }

/* ---- Detail pages ---- */
.detail-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 20px; align-items: start; }
@media (max-width: 900px) { .detail-grid { grid-template-columns: 1fr; } }
.kv { display: grid; grid-template-columns: 170px 1fr; gap: 6px 14px; font-size: 14px; }
.kv dt { color: var(--muted); }
.kv dd { font-weight: 500; }

/* ---- Chat ---- */
.chat-box { display: flex; flex-direction: column; height: 60vh; }
.chat-messages { flex: 1; overflow-y: auto; padding: 14px; display: flex; flex-direction: column; gap: 8px; background: var(--bg); border-radius: 8px; }
.msg { max-width: 70%; padding: 9px 13px; border-radius: 14px; font-size: 14px; }
.msg.mine { align-self: flex-end; background: var(--primary); color: #fff; border-bottom-right-radius: 4px; }
.msg.theirs { align-self: flex-start; background: #fff; border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.msg .msg-time { display: block; font-size: 11px; opacity: .7; margin-top: 3px; }
.chat-input { display: flex; gap: 10px; margin-top: 12px; }
.chat-input input { flex: 1; }

/* ---- Pagination ---- */
.pagination { display: flex; gap: 6px; margin-top: 18px; flex-wrap: wrap; }
.pagination a, .pagination span {
    padding: 6px 12px; border: 1px solid var(--border); border-radius: 8px;
    background: #fff; color: var(--text); font-size: 14px;
}
.pagination .current { background: var(--primary); color: #fff; border-color: var(--primary); font-weight: 700; }
.pagination .disabled { color: var(--muted); opacity: .6; }
.pagination a:hover { background: var(--bg); text-decoration: none; }

/* ---- Misc ---- */
.empty-state { text-align: center; color: var(--muted); padding: 48px 16px; }
.empty-state .es-icon { font-size: 40px; margin-bottom: 10px; }
.actions-row { display: flex; gap: 8px; flex-wrap: wrap; }
.mb-0 { margin-bottom: 0; }
.mt-16 { margin-top: 16px; }
.text-muted { color: var(--muted); }
.inline-form { display: inline; }