:root {
    --bg: #f5f7fb;
    --panel: #ffffff;
    --ink: #182230;
    --muted: #667085;
    --line: #d9e0ea;
    --accent: #0f766e;
    --accent-2: #2563eb;
    --sidebar: #111827;
}

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

.app-shell {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 278px;
    background: var(--sidebar);
    color: #fff;
    padding: 24px 18px;
    position: fixed;
    inset: 0 auto 0 0;
}

.brand {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 28px;
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border-radius: 8px;
    background: var(--accent);
    font-weight: 800;
}

.brand small {
    display: block;
    color: #aab4c2;
}

.nav-link {
    color: #cbd5e1;
    border-radius: 8px;
    padding: 11px 13px;
    margin-bottom: 4px;
}

.nav-link:hover,
.nav-link.active {
    color: #fff;
    background: rgba(255,255,255,.1);
}

.nav-link.logout {
    margin-top: 18px;
    color: #fecaca;
}

.main {
    margin-left: 278px;
    width: calc(100% - 278px);
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 32px;
    background: var(--panel);
    border-bottom: 1px solid var(--line);
}

.topbar h1 {
    margin: 0;
    font-size: 25px;
    line-height: 1.2;
}

.topbar span,
.muted {
    color: var(--muted);
}

.content {
    padding: 28px 32px 48px;
}

.user-chip,
.badge-soft {
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 8px 12px;
    background: #fff;
}

.card,
.table-wrap,
.form-panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: 0 10px 28px rgba(15, 23, 42, .04);
}

.metric {
    padding: 18px;
}

.metric strong {
    display: block;
    font-size: 28px;
}

.table-wrap {
    overflow: hidden;
}

.table {
    margin-bottom: 0;
}

.form-panel {
    padding: 22px;
}

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
}

.btn-outline-primary {
    color: var(--accent-2);
    border-color: var(--accent-2);
}

.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
    background: linear-gradient(135deg, #0f766e, #1f2937);
}

.login-card {
    width: min(430px, 100%);
    background: #fff;
    border-radius: 8px;
    padding: 30px;
}

.message-bubble {
    max-width: 720px;
    padding: 12px 14px;
    border-radius: 8px;
    margin-bottom: 10px;
}

.message-in {
    background: #eef2ff;
}

.message-out {
    background: #dcfce7;
    margin-left: auto;
}

.qr-panel {
    display: flex;
    gap: 16px;
    align-items: center;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #f8fafc;
}

.qr-panel img {
    width: 132px;
    height: 132px;
    border-radius: 6px;
    background: #fff;
    border: 1px solid var(--line);
}

@media (max-width: 900px) {
    .sidebar {
        position: static;
        width: 100%;
        min-height: auto;
    }
    .app-shell {
        display: block;
    }
    .main {
        margin-left: 0;
        width: 100%;
    }
    .topbar,
    .content {
        padding-left: 18px;
        padding-right: 18px;
    }
    .qr-panel {
        align-items: flex-start;
        flex-direction: column;
    }
}