:root {
    color-scheme: light;
    --ink: #202124;
    --muted: #73777d;
    --line: #e8e9eb;
    --soft: #f7f8f9;
    --accent: #2459d3;
    --danger: #b42318;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: #fff;
    color: var(--ink);
    font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }
button { cursor: pointer; }

.topbar {
    min-height: 68px;
    padding: 0 max(24px, calc((100% - 1040px) / 2));
    border-bottom: 1px solid var(--line);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.brand { font-size: 19px; font-weight: 700; letter-spacing: -.04em; }
.navigation { display: flex; align-items: center; gap: 22px; color: #555b63; font-size: 14px; }
.user-label { color: var(--ink); font-weight: 600; }
.container { width: min(100% - 40px, 920px); min-height: calc(100vh - 130px); margin: 42px auto 64px; }
.page-heading { display: flex; justify-content: space-between; align-items: center; gap: 20px; margin-bottom: 26px; }
.page-heading h1, .login-panel h1 { margin: 2px 0 0; font-size: clamp(28px, 5vw, 36px); letter-spacing: -.045em; line-height: 1.15; }
.eyebrow { margin: 0; color: var(--muted); font-size: 12px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.muted { color: var(--muted); }
.panel { padding: 24px; margin-bottom: 24px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.panel h2 { margin: 0 0 18px; font-size: 17px; }

input, select {
    width: 100%;
    min-height: 44px;
    padding: 10px 12px;
    border: 1px solid #d9dce1;
    border-radius: 7px;
    background: #fff;
    color: var(--ink);
}
input:focus, select:focus { outline: 3px solid #2459d322; border-color: var(--accent); }
label { display: block; color: #45494f; font-size: 13px; font-weight: 600; }
label input, label select { margin-top: 6px; }
button {
    min-height: 42px;
    padding: 9px 16px;
    border: 1px solid var(--accent);
    border-radius: 7px;
    background: var(--accent);
    color: #fff;
    font-weight: 600;
}
button:hover { background: #1949b6; }
.button-secondary { border-color: #d9dce1; background: #fff; color: #30343a; }
.button-secondary:hover { background: var(--soft); }
.link-button { min-height: auto; padding: 0; border: 0; background: none; color: inherit; font-weight: 500; }
.link-button:hover { background: none; color: var(--accent); }
.danger-text { color: var(--danger); }
.inline-form { display: inline-flex; margin: 0; }
.create-list-form { display: flex; gap: 10px; }
.create-list-form input { flex: 1; }
.login-panel { width: min(100%, 410px); margin: 70px auto; }
.login-panel h1 { margin-top: 10px; }
.stack-form { display: grid; gap: 10px; margin-top: 26px; }
.security-note { margin: 24px 0 0; padding: 12px; border-radius: 7px; background: #fff8e6; color: #77590b; font-size: 13px; }
.list-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(245px, 1fr)); gap: 14px; }
.list-card { padding: 19px; border: 1px solid var(--line); border-radius: 11px; }
.list-card:hover { border-color: #c9cdd4; }
.list-card h2 { margin: 0 0 5px; font-size: 17px; }
.list-card p { margin: 0; font-size: 13px; }
.card-actions { display: flex; justify-content: space-between; align-items: center; margin-top: 18px; padding-top: 12px; border-top: 1px solid var(--line); }
.card-actions button { font-size: 13px; }
.empty-state { padding: 30px 20px; border: 1px dashed #d9dce1; border-radius: 10px; color: var(--muted); text-align: center; }
.back-link { display: inline-block; margin-bottom: 12px; color: var(--muted); font-size: 13px; }
.add-item-form { display: flex; align-items: end; gap: 12px; }
.field-grow { flex: 1; min-width: 180px; }
.category-field { width: min(100%, 340px); }
.category-select-row { display: flex; align-items: center; gap: 8px; margin-top: 6px; }
.category-select-row select, .category-select-row input { margin-top: 0; }
.category-select-row button { flex-shrink: 0; }
.new-category-form { max-width: 560px; margin-top: 20px; }
.bulk-help { margin: -8px 0 16px; font-size: 14px; }
.bulk-textarea { display: block; min-height: 120px; resize: vertical; font: inherit; }
.bulk-controls { max-width: 540px; margin-top: 16px; }
.bulk-control-row { display: flex; gap: 10px; margin-top: 6px; }
.bulk-control-row select { flex: 1; }
.bulk-feedback { min-height: 20px; margin: 10px 0 0; color: #176b34; font-size: 13px; }
.error-text { color: var(--danger); }
.bulk-preview { margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--line); }
.bulk-preview-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.bulk-preview-heading h3 { margin: 0 0 10px; font-size: 15px; }
.bulk-preview-list { margin-bottom: 16px; }
.bulk-preview-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(180px, 260px) auto; align-items: center; gap: 10px; padding: 8px 0; border-bottom: 1px solid #f0f0f0; }
.bulk-preview-row label { min-width: 0; }
.bulk-preview-row input, .bulk-preview-row select { min-height: 40px; margin: 0; }
.hidden { display: none; }
.form-feedback { color: var(--danger); font-size: 13px; }
.category-group { margin: 24px 0; }
.category-group h2 { padding-bottom: 8px; border-bottom: 1px solid var(--line); font-size: 17px; }
.item-row { min-height: 54px; display: flex; align-items: center; justify-content: space-between; gap: 14px; border-bottom: 1px solid #f0f0f0; }
.item-label { display: flex; align-items: center; gap: 12px; cursor: pointer; font-size: 15px; font-weight: 400; }
.item-label input[type="checkbox"] { width: 19px; min-height: 19px; height: 19px; margin: 0; accent-color: var(--accent); }
.is-checked .item-label span { color: #90949a; text-decoration: line-through; }
.icon-button { min-height: 30px; padding: 4px 8px; border-color: transparent; background: transparent; color: var(--muted); font-size: 12px; }
.icon-button:hover { background: var(--soft); color: var(--danger); }
.user-form, .user-row { display: grid; grid-template-columns: 1.1fr 1.3fr .8fr .65fr auto; align-items: end; gap: 12px; }
.user-list { display: grid; gap: 18px; }
.user-row { padding-top: 18px; border-top: 1px solid var(--line); }
.checkbox-field { display: flex; align-items: center; gap: 7px; min-height: 44px; white-space: nowrap; }
.checkbox-field input { width: 17px; min-height: 17px; height: 17px; margin: 0; }
.user-actions { display: flex; align-items: center; gap: 12px; }
.user-actions button { font-size: 13px; }
.notice { margin-bottom: 22px; padding: 12px 15px; border-radius: 8px; font-size: 14px; }
.notice-success { background: #edf8f0; color: #176b34; }
.notice-error { background: #fff0ef; color: #a1261c; }
.footer { padding: 20px; border-top: 1px solid var(--line); color: #8a8e94; font-size: 12px; text-align: center; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; }

@media (max-width: 700px) {
    .topbar { padding: 0 18px; }
    .navigation { gap: 12px; }
    .user-label { display: none; }
    .container { width: min(100% - 28px, 920px); margin-top: 28px; }
    .panel { padding: 18px; }
    .add-item-form, .user-form, .user-row { display: grid; grid-template-columns: 1fr; }
    .bulk-preview-row { grid-template-columns: minmax(0, 1fr) auto; }
    .bulk-preview-row label:nth-child(2) { grid-column: 1; grid-row: 2; }
    .bulk-preview-row button { grid-column: 2; grid-row: 1 / span 2; }
    .category-field { width: 100%; }
    .create-list-form { flex-direction: column; }
    .page-heading { align-items: flex-start; }
}