:root {
    --accent: #2563eb;
    --bg: #f6f7f9;
    --surface: #ffffff;
    --text: #111827;
    --muted: #6b7280;
    --border: #e5e7eb;
    --danger: #dc2626;
    --ok: #15803d;
    --radius: 8px;
    --shadow: 0 1px 2px rgba(0, 0, 0, .05), 0 4px 16px rgba(0, 0, 0, .06);
    color-scheme: light;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f1115;
        --surface: #181b21;
        --text: #e5e7eb;
        --muted: #9ca3af;
        --border: #2a2f38;
        --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 4px 16px rgba(0, 0, 0, .3);
        color-scheme: dark;
    }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body {
    background: var(--bg);
    color: var(--text);
    font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--accent); }
h1 { font-size: 24px; margin: 0 0 16px; display: flex; align-items: center; gap: 10px; }
h2 { font-size: 17px; margin: 0 0 12px; }
h3 { font-size: 14px; margin: 18px 0 8px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.mt { margin-top: 28px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.error { color: var(--danger); }
.ok { color: var(--ok); }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; background: color-mix(in srgb, var(--text) 7%, transparent); padding: 2px 6px; border-radius: 4px; word-break: break-all; }
code.secret { font-size: 15px; }

/* top bar */
.topbar {
    display: flex; align-items: center; gap: 24px;
    height: 56px; padding: 0 16px;
    background: var(--surface); border-bottom: 1px solid var(--border);
    border-top: 3px solid var(--accent);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 600; }
.brand img { height: 28px; max-width: 120px; object-fit: contain; }
.brand-mark { width: 28px; height: 28px; border-radius: 6px; background: var(--accent); color: #fff; display: grid; place-items: center; font-weight: 700; }
.topnav { display: flex; gap: 4px; }
.topnav a { padding: 6px 12px; border-radius: 6px; color: var(--muted); text-decoration: none; font-weight: 500; }
.topnav a:hover { background: color-mix(in srgb, var(--text) 6%, transparent); color: var(--text); }
.topnav a.active { color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.signout { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.who { color: var(--muted); font-size: 14px; }

.flash { max-width: 1100px; margin: 12px auto 0; padding: 10px 14px; border-radius: var(--radius); background: color-mix(in srgb, var(--ok) 12%, var(--surface)); color: var(--ok); }

/* layout */
.page { max-width: 1100px; margin: 0 auto; padding: 24px 16px 48px; }
.page.narrow { max-width: 440px; padding-top: 56px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 20px; box-shadow: var(--shadow); }
.card.highlight { border-color: var(--accent); margin-bottom: 16px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-items: start; }
.grid-2.wide-left { grid-template-columns: 3fr 2fr; }
@media (max-width: 800px) { .grid-2, .grid-2.wide-left { grid-template-columns: 1fr; } }

/* forms */
label { display: block; margin-bottom: 12px; font-size: 13px; font-weight: 500; color: var(--muted); }
label.check { display: flex; align-items: center; gap: 6px; color: var(--text); font-size: 14px; font-weight: 400; }
input, select, textarea {
    display: block; width: 100%; margin-top: 4px;
    padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px;
    background: var(--surface); color: var(--text); font: inherit;
}
input[type=checkbox] { display: inline; width: auto; margin: 0; accent-color: var(--accent); }
input[type=color] { width: 48px; height: 38px; padding: 2px; }
input[type=file] { padding: 6px; }
input:focus, select:focus, textarea:focus { outline: 2px solid color-mix(in srgb, var(--accent) 40%, transparent); border-color: var(--accent); }
.inline-form { display: flex; gap: 8px; align-items: center; margin: 8px 0; }
.inline-form.wrap { flex-wrap: wrap; }
.inline-form input, .inline-form select { margin-top: 0; width: auto; flex: 1 1 160px; }
.inline-form input[type=color] { flex: 0 0 48px; }
.inline-form label.check { margin: 0; }

.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 8px 14px; border-radius: 6px; border: 1px solid transparent;
    font: inherit; font-weight: 600; cursor: pointer; text-decoration: none; white-space: nowrap;
    background: color-mix(in srgb, var(--text) 6%, transparent); color: var(--text);
}
.btn:disabled { opacity: .6; cursor: default; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-outline { background: transparent; border-color: var(--accent); color: var(--accent); }
.btn-ghost { background: transparent; color: var(--muted); }
.btn-ghost:hover { background: color-mix(in srgb, var(--text) 6%, transparent); color: var(--text); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger-ghost { background: transparent; color: var(--danger); }
.btn-sm { padding: 4px 10px; font-size: 13px; }
.btn-block { width: 100%; }
.btn-microsoft { width: 100%; background: var(--surface); border: 1px solid var(--border); color: var(--text); padding: 10px; }
.icon-btn { border: 0; background: transparent; color: var(--muted); font-size: 24px; line-height: 1; cursor: pointer; padding: 4px 8px; border-radius: 6px; }
.icon-btn:hover { background: color-mix(in srgb, var(--text) 6%, transparent); }

.auth-card h1 { margin-bottom: 12px; }
.divider { display: flex; align-items: center; gap: 10px; margin: 18px 0; color: var(--muted); font-size: 13px; }
.divider::before, .divider::after { content: ""; flex: 1; border-top: 1px solid var(--border); }
.rsvp-buttons { display: flex; gap: 8px; margin-top: 20px; }

.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th { text-align: left; font-size: 12px; color: var(--muted); font-weight: 600; padding: 6px 8px; border-bottom: 1px solid var(--border); }
.table td { padding: 8px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.table td .inline-form { margin: 0; }
.table .actions { display: flex; gap: 4px; justify-content: flex-end; }
.disabled-row td { opacity: .55; }
.plain-list { list-style: none; padding: 0; margin: 0 0 12px; }
.plain-list li { display: flex; align-items: center; gap: 8px; padding: 6px 0; }
.badge { font-size: 11px; font-weight: 600; padding: 1px 7px; border-radius: 10px; background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); }
.badge-muted { background: color-mix(in srgb, var(--text) 8%, transparent); color: var(--muted); }
.swatch { display: inline-block; width: 12px; height: 12px; border-radius: 3px; flex: none; }
.swatch.lg { width: 18px; height: 18px; border-radius: 4px; }
.details { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 0 0 12px; }
.details dt { color: var(--muted); font-size: 13px; }
.details dd { margin: 0; }
.logo-preview { height: 36px; vertical-align: middle; margin-right: 12px; }

/* calendar app */
.app-body { height: 100vh; display: flex; flex-direction: column; overflow: hidden; }
.app { flex: 1; display: flex; min-height: 0; }
.sidebar { width: 240px; flex: none; padding: 16px; border-right: 1px solid var(--border); background: var(--surface); overflow-y: auto; }
.cal-list { list-style: none; padding: 0; margin: 0 0 12px; }
.cal-list label { display: flex; align-items: flex-start; gap: 8px; margin: 0; padding: 5px 0; color: var(--text); font-weight: 400; font-size: 14px; cursor: pointer; }
.cal-list .swatch { margin-top: 4px; }
.cal-list input { margin-top: 3px; }
.cal-name { display: flex; flex-direction: column; line-height: 1.3; }
.cal-owner { font-size: 12px; color: var(--muted); }
.calendar-pane { flex: 1; min-width: 0; padding: 12px 16px; background: var(--surface); }
.fab { display: none; }
@media (max-width: 760px) {
    .sidebar { display: none; }
    .fab {
        display: grid; place-items: center; position: fixed; right: 16px; bottom: 20px; z-index: 5;
        width: 56px; height: 56px; border-radius: 50%; border: 0; background: var(--accent); color: #fff;
        font-size: 30px; line-height: 1; box-shadow: var(--shadow); cursor: pointer;
    }
    .fc .fc-toolbar { flex-wrap: wrap; gap: 8px; }
    .fc .fc-toolbar-title { font-size: 16px; }
    .topbar { gap: 12px; }
    .brand span:last-child { display: none; }
    .topnav a { padding: 6px 8px; }
    .who { display: none; }
    .calendar-pane { padding: 8px; }
}

.fc { --fc-border-color: var(--border); --fc-today-bg-color: color-mix(in srgb, var(--accent) 7%, transparent); --fc-now-indicator-color: var(--danger); --fc-page-bg-color: var(--surface); --fc-neutral-bg-color: var(--bg); --fc-list-event-hover-bg-color: var(--bg); }
.fc .fc-button-primary { background: var(--surface); color: var(--text); border-color: var(--border); font-weight: 500; text-transform: none; }
.fc .fc-button-primary:hover { background: var(--bg); color: var(--text); border-color: var(--border); }
.fc .fc-button-primary:not(:disabled).fc-button-active, .fc .fc-button-primary:not(:disabled):active { background: color-mix(in srgb, var(--accent) 12%, var(--surface)); color: var(--accent); border-color: var(--border); }
.fc .fc-toolbar-title { font-size: 20px; }
.fc-event { cursor: pointer; }
.fc .ev-busy { opacity: .55; background-image: repeating-linear-gradient(45deg, transparent 0 6px, rgba(255, 255, 255, .25) 6px 12px); }
.fc .ev-pending { background-color: var(--surface) !important; }
.fc .ev-pending .fc-event-main, .fc .ev-pending .fc-event-time, .fc .ev-pending .fc-event-title { color: var(--text); }
.fc .ev-tentative { background-image: repeating-linear-gradient(45deg, transparent 0 6px, rgba(255, 255, 255, .3) 6px 12px); }
.fc .ev-declined, .fc .ev-cancelled { opacity: .5; }
.fc .ev-declined .fc-event-title, .fc .ev-cancelled .fc-event-title { text-decoration: line-through; }

/* dialogs */
dialog { border: 0; border-radius: 12px; padding: 0; background: var(--surface); color: var(--text); box-shadow: 0 20px 60px rgba(0, 0, 0, .3); }
dialog::backdrop { background: rgba(15, 17, 21, .45); }
.event-dialog { width: min(620px, calc(100vw - 32px)); }
.small-dialog { width: min(380px, calc(100vw - 32px)); padding: 20px; }
.dialog-head { display: flex; align-items: center; gap: 8px; padding: 16px 16px 8px 20px; }
.dialog-head h2 { flex: 1; margin: 0; font-size: 20px; }
.title-input { flex: 1; font-size: 20px; font-weight: 600; border: 0; border-bottom: 2px solid var(--border); border-radius: 0; padding: 6px 2px; margin: 0; }
.title-input:focus { outline: none; border-bottom-color: var(--accent); }
.dialog-body { padding: 8px 20px; max-height: calc(100vh - 200px); overflow-y: auto; }
.dialog-foot { display: flex; align-items: center; gap: 8px; padding: 12px 20px 16px; border-top: 1px solid var(--border); flex-wrap: wrap; }
.spacer { flex: 1; }
.row { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; }
.row .grow { flex: 1 1 140px; }
.row label.check { margin-bottom: 20px; }
.weekdays { gap: 4px; margin: -4px 0 12px; }
.weekdays label { margin: 0; }
.weekdays input { display: none; }
.weekdays label { padding: 4px 9px; border: 1px solid var(--border); border-radius: 14px; cursor: pointer; color: var(--text); font-weight: 500; }
.weekdays label:has(input:checked) { background: var(--accent); border-color: var(--accent); color: #fff; }
.scope-buttons { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.description { white-space: pre-wrap; border-top: 1px solid var(--border); padding-top: 10px; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; padding: 6px; border: 1px solid var(--border); border-radius: 6px; margin-top: 4px; background: var(--surface); }
.chips input { flex: 1 1 160px; border: 0; padding: 4px; margin: 0; width: auto; }
.chips input:focus { outline: none; }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 2px 4px 2px 8px; border-radius: 14px; background: color-mix(in srgb, var(--accent) 10%, transparent); color: var(--text); font-size: 13px; font-weight: 500; }
.chip button { border: 0; background: transparent; color: var(--muted); cursor: pointer; font-size: 16px; line-height: 1; padding: 0 4px; }
.suggestions { list-style: none; margin: 2px 0 0; padding: 4px 0; border: 1px solid var(--border); border-radius: 6px; background: var(--surface); box-shadow: var(--shadow); color: var(--text); font-weight: 400; }
.suggestions li { padding: 6px 10px; cursor: pointer; }
.suggestions li:hover { background: color-mix(in srgb, var(--accent) 8%, transparent); }
.status-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; flex: none; background: var(--muted); }
.s-accepted { background: var(--ok); }
.s-declined { background: var(--danger); }
.s-tentative { background: #d97706; }
.attendee-list { list-style: none; padding: 0; margin: 0 0 12px; }
.attendee-list li { display: flex; align-items: center; gap: 8px; padding: 3px 0; }
.dialog-body h4 { margin: 12px 0 4px; font-size: 13px; color: var(--muted); }

.availability { margin: -4px 0 14px; font-size: 12px; }
.av-head, .av-row { display: flex; align-items: center; gap: 8px; height: 22px; }
.av-name { width: 110px; flex: none; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.av-hours, .av-track { position: relative; flex: 1; height: 100%; }
.av-hours span { position: absolute; transform: translateX(-50%); color: var(--muted); font-size: 11px; }
.av-track { height: 14px; background: color-mix(in srgb, var(--text) 5%, transparent); border-radius: 3px; overflow: hidden; }
.av-track .busy { position: absolute; top: 0; bottom: 0; background: color-mix(in srgb, var(--text) 35%, transparent); }
.av-track .sel { position: absolute; top: 0; bottom: 0; border: 2px solid var(--accent); background: color-mix(in srgb, var(--accent) 20%, transparent); border-radius: 3px; }
.av-track .unknown { position: absolute; left: 6px; top: -1px; color: var(--muted); font-size: 11px; }