:root {
    color-scheme: light;
    --bg: #f4f7fb;
    --card: #ffffff;
    --border: #d9e0ea;
    --text: #132033;
    --muted: #5f7087;
    --accent: #1b62f0;
    --danger: #c0372f;
    --radius: 18px;
    --shadow: 0 18px 42px rgba(19, 32, 51, 0.08);
}
* {
    box-sizing: border-box;
}
body {
    margin: 0;
    min-height: 100vh;
    background: radial-gradient(circle at top, #ffffff 0, #edf3ff 34%, var(--bg) 100%);
    color: var(--text);
    font:
        16px/1.45 "Segoe UI",
        system-ui,
        sans-serif;
}
.page {
    display: grid;
    gap: 18px;
    min-height: 100vh;
    padding: 18px;
}
.launcher-return-row {
    display: flex;
    justify-content: flex-end;
}
.launcher-return {
    border: 1px solid var(--border);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.92);
    color: var(--text);
    padding: 8px 12px;
    text-decoration: none;
    box-shadow: var(--shadow);
}
.panel,
.topbar {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.96);
    box-shadow: var(--shadow);
}
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 16px 18px;
}
.brand {
    display: grid;
    gap: 2px;
}
.brand strong {
    font-size: 18px;
}
.brand span {
    color: var(--muted);
    font-size: 13px;
}
.panel {
    padding: 18px;
}
.intro h1,
.panel h1,
.panel h2,
.panel h3 {
    margin: 0 0 8px;
    line-height: 1.05;
    letter-spacing: -0.03em;
}
.intro p,
.panel p,
.panel li,
.helper {
    color: var(--muted);
}
.grid {
    display: grid;
    gap: 14px;
}
.grid.two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}
.field {
    display: grid;
    gap: 6px;
}
.form-section {
    display: grid;
    gap: 14px;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: rgba(248, 251, 255, 0.8);
}
.form-section-header {
    display: grid;
    gap: 4px;
}
.form-section-header h3,
.advanced-section summary {
    margin: 0;
    font-size: 18px;
    line-height: 1.1;
}
.form-section-header p {
    margin: 0;
    color: var(--muted);
}
.advanced-section summary {
    cursor: pointer;
    font-weight: 700;
}
.advanced-section[open] summary {
    margin-bottom: 12px;
}
.field label,
.field span {
    font-weight: 600;
}
input,
textarea,
select,
button {
    font: inherit;
}
input,
textarea,
select {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #fff;
    color: var(--text);
    padding: 10px 12px;
}
textarea {
    min-height: 96px;
    resize: vertical;
}
button,
.button-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border-radius: 12px;
    border: 1px solid var(--accent);
    background: var(--accent);
    color: #fff;
    padding: 10px 14px;
    text-decoration: none;
    cursor: pointer;
}
button.secondary,
.button-link.secondary {
    background: #fff;
    color: var(--text);
    border-color: var(--border);
}
button.danger {
    background: #fff5f4;
    color: var(--danger);
    border-color: #f2c3be;
}
.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.status {
    min-height: 24px;
    font-weight: 600;
}
.status.error {
    color: var(--danger);
}
.status.success {
    color: #0f766e;
}
.session-card {
    display: grid;
    gap: 10px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: #f8fbff;
    padding: 14px;
}
.pill-row,
.topbar-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}
.pill {
    border: 1px solid var(--border);
    border-radius: 999px;
    background: #fff;
    padding: 8px 12px;
}
.mode-switch {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.mode-btn,
.mode-link,
.ghost-link {
    border: 1px solid var(--border);
    border-radius: 999px;
    background: #fff;
    color: var(--text);
    padding: 8px 12px;
    text-decoration: none;
}
.mode-btn {
    cursor: pointer;
}
.mode-btn.is-active {
    border-color: var(--accent);
    background: var(--accent);
    color: #fff;
}
.workspace {
    display: grid;
    gap: 14px;
}
.minimal-workspace {
    align-items: start;
}
body[data-mode="split-panel"] .minimal-workspace {
    grid-template-columns: minmax(280px, 0.9fr) minmax(420px, 1.25fr);
}
.form-actions {
    align-self: end;
}
#widget-panel[hidden] {
    display: none;
}
.host-modal-backdrop[aria-hidden="true"] {
    display: none;
}
.host-modal-backdrop {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10, 20, 37, 0.42);
    padding: 16px;
    z-index: 2147482100;
}
.host-modal-card {
    width: min(560px, 92vw);
    border-radius: 18px;
    background: #fff;
    padding: 22px;
    box-shadow: 0 22px 48px rgba(19, 32, 51, 0.24);
}
.host-modal-card .actions {
    margin-top: 14px;
}
.toasts {
    position: fixed;
    right: 16px;
    bottom: 16px;
    z-index: 2147482000;
}
@media (max-width: 920px) {
    .grid.two {
        grid-template-columns: 1fr;
    }
    body[data-mode="split-panel"] .minimal-workspace {
        grid-template-columns: 1fr;
    }
    .topbar {
        align-items: flex-start;
        flex-direction: column;
    }
}