:root {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  font-synthesis: none;
  color: #1c1c1e;
  background: #f5f5f7;
  color-scheme: light;
  --ink: #1c1c1e;
  --muted: #6b6b70;
  --line: #e5e5e9;
  --accent: #0066cc;
  --surface: #fff;
  --field: #f5f5f7;
  --danger: #b4232d;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
button:disabled { cursor: default; }
button:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
input, textarea, select { background: var(--surface); }
input[type=checkbox] { accent-color: var(--accent); }
a { color: var(--accent); }
h1, h2, h3, p { margin: 0; }
.startup { padding: 72px 24px; text-align: center; }
.startup strong { font-size: 1.5rem; }
.startup p { color: var(--muted); margin-top: 16px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
.topbar { min-height: 72px; padding: max(16px, env(safe-area-inset-top)) 32px 16px; display: flex; align-items: center; justify-content: space-between; gap: 16px; background: var(--surface); }
.brand { display: flex; align-items: center; gap: 10px; font-size: 1.125rem; font-weight: 650; letter-spacing: -.02em; }
.brand-mark { width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; gap: 3px; }
.brand-mark i { display: block; width: 3px; height: 14px; border-radius: 1px; background: var(--accent); }
.brand-mark i:nth-child(2) { height: 21px; }
.brand-mark i:nth-child(3) { height: 10px; }
.storage-note { font-size: .8125rem; color: var(--muted); }
.shell { max-width: 1080px; margin: auto; padding: 36px 32px max(64px, env(safe-area-inset-bottom)); }
.datebar { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 18px; margin-bottom: 28px; }
.date-title-line { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.date-title { font-size: 2rem; font-weight: 700; letter-spacing: -.035em; line-height: 1.3; }
.weekday { font-size: .875rem; color: var(--muted); }
.today-chip { color: var(--muted); font-size: .8125rem; }
.date-controls { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; max-width: 100%; }
.date-picker { border: 0; border-radius: 8px; padding: 9px 12px; min-height: 44px; width: 12rem; min-width: 0; max-width: 100%; font-size: 1rem; }
.button { border: 0; border-radius: 8px; min-height: 44px; padding: 10px 16px; font-size: .9375rem; font-weight: 600; display: inline-flex; gap: 8px; align-items: center; justify-content: center; }
.primary { background: var(--accent); color: white; }
.primary:hover { background: #005ab5; }
.primary:disabled { color: var(--muted); background: #f0f0f3; }
.secondary, .subtle { background: transparent; color: var(--accent); }
.secondary:hover, .subtle:hover { background: #ececef; }
.wide { width: 100%; }
.layout { display: grid; grid-template-columns: minmax(0,1fr) 224px; gap: 28px; align-items: start; }
.workspace { min-width: 0; }
.body-tabs { display: grid; grid-template-columns: repeat(auto-fit,minmax(2.75rem,1fr)); gap: 2px; padding: 3px; margin-bottom: 24px; background: #eaeaec; border-radius: 9px; }
.body-tabs .body-tab { padding: 8px 4px; min-height: 44px; background: transparent; color: var(--muted); font-size: .875rem; font-weight: 500; white-space: nowrap; border-radius: 6px; }
.body-tab[aria-pressed=true] { background: var(--surface); color: var(--ink); font-weight: 650; }
.section-top { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 12px; }
.section-top h2 { font-size: 1rem; font-weight: 600; }
.count { font-weight: 400; font-size: .8125rem; color: var(--muted); margin-left: 8px; }
.section-top .button { padding: 8px 0 8px 12px; }
.exercise-list { display: grid; gap: 20px; }
.exercise-card { background: var(--surface); border-radius: 12px; overflow: hidden; }
.exercise-header { padding: 24px 24px 12px; }
.exercise-heading { display: flex; justify-content: space-between; gap: 12px; align-items: baseline; }
.exercise-heading h3 { font-size: 1.1875rem; font-weight: 650; overflow-wrap: anywhere; line-height: 1.5; }
.body-tag { color: var(--muted); font-size: .8125rem; white-space: nowrap; }
.previous { font-size: .8125rem; color: var(--muted); margin-top: 8px; overflow-wrap: anywhere; }
.copy-button { margin-top: 4px; padding: 8px 0; background: none; color: var(--accent); min-height: 44px; font-size: .875rem; font-weight: 500; }
.sets { padding: 0 24px; }
.set-row { padding: 16px 0; border-bottom: 1px solid var(--line); }
.set-row:last-child { border-bottom: 0; }
.set-main { display: grid; grid-template-columns: 24px minmax(0,1fr) 12px minmax(0,1fr); gap: 12px; align-items: end; }
.set-number { color: var(--muted); font-size: .875rem; font-weight: 500; text-align: left; align-self: end; padding-bottom: 14px; font-variant-numeric: tabular-nums; }
.field-label { display: block; font-size: .875rem; color: var(--muted); margin-bottom: 6px; }
.input-unit { display: flex; align-items: center; border-radius: 8px; min-height: 54px; background: var(--field); padding-right: 12px; }
.input-unit:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }
.input-unit:has([aria-invalid=true]) { outline: 2px solid var(--danger); outline-offset: 2px; }
.number-input { width: 100%; min-width: 0; border: 0; background: transparent; font-size: 1.375rem; font-weight: 500; font-variant-numeric: tabular-nums; padding: 8px 12px; outline: none !important; }
.unit { color: var(--muted); font-size: .875rem; }
.times { color: #8e8e93; font-size: .875rem; padding-bottom: 15px; }
.set-details { margin: 4px 0 0 36px; display: flex; justify-content: space-between; align-items: center; gap: 4px 12px; flex-wrap: wrap; }
.drop-control { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: .875rem; min-height: 44px; cursor: pointer; }
.drop-control input { width: 18px; height: 18px; margin: 0; flex: none; }
.row-status { font-size: .8125rem; color: var(--muted); overflow-wrap: anywhere; }
.row-status[data-state=error], .comment-status[data-state=error] { color: var(--danger); }
.row-actions, .set-validation { margin-left: 36px; }
.row-actions { display: flex; gap: 10px; align-items: center; }
.set-validation { font-size: .875rem; color: var(--muted); margin-top: 4px; }
.set-row:has([aria-invalid=true]) .set-validation { color: var(--danger); }
.set-validation:empty { display: none; }
.retry { font-size: .875rem; min-height: 44px; background: transparent; padding: 6px 0; color: var(--accent); }
.add-set { margin: 0 24px 12px; font-size: .875rem; font-weight: 500; color: var(--accent); background: transparent; min-height: 44px; padding: 8px 0; }
.comment-box { padding: 16px 24px 0; border-top: 1px solid var(--line); }
.comment-label { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 6px; font-size: .875rem; color: var(--muted); margin-bottom: 8px; }
.comment-label span:last-child { font-size: .75rem; }
.comment-box textarea { display: block; resize: vertical; min-height: 80px; width: 100%; border: 0; background: var(--field); border-radius: 8px; padding: 12px; font-size: 1rem; line-height: 1.6; }
.comment-box textarea::placeholder { color: var(--muted); }
.comment-status { margin-top: 8px; font-size: .8125rem; min-height: 20px; color: var(--muted); }
.exercise-footer { padding: 16px 24px 24px; }
.exercise-confirm { width: 100%; min-height: 48px; font-size: 1rem; }
.exercise-status { font-size: .875rem; color: var(--muted); margin-bottom: 12px; overflow-wrap: anywhere; }
.exercise-status:empty { display: none; }
.exercise-status[data-state=error] { color: var(--danger); }
.empty { background: var(--surface); border-radius: 12px; padding: 44px 24px; text-align: center; }
.empty-symbol { color: var(--muted); margin: 0 auto 12px; font-size: 2rem; font-weight: 300; }
.empty h3 { font-size: 1.125rem; font-weight: 600; margin-bottom: 10px; }
.empty p { font-size: .875rem; color: var(--muted); max-width: 290px; margin: 0 auto 24px; }
.empty .button { min-width: 190px; }
.aside { display: grid; gap: 24px; }
.session-summary { padding: 24px; background: var(--surface); border-radius: 12px; }
.session-summary h2 { font-size: .875rem; font-weight: 600; }
.summary-numbers { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 18px 0; }
.summary-item strong { font-size: 2rem; line-height: 1.2; font-weight: 600; letter-spacing: -.035em; font-variant-numeric: tabular-nums; display: block; }
.summary-item span { font-size: .8125rem; color: var(--muted); }
.summary-footer { border-top: 1px solid var(--line); padding-top: 12px; font-size: .8125rem; color: var(--muted); }
.quiet-note { padding: 0 4px; }
.quiet-note h3 { font-size: .875rem; font-weight: 600; margin-bottom: 8px; }
.quiet-note p { color: var(--muted); font-size: .8125rem; line-height: 1.8; }
.save-guide { padding: 16px 4px 0; }
.save-guide strong { font-size: .8125rem; font-weight: 500; color: var(--muted); }
.save-guide p { font-size: .8125rem; color: var(--muted); margin-top: 4px; }
.past-notice { color: var(--muted); font-size: .875rem; margin-bottom: 16px; }
.toast { position: fixed; bottom: max(24px,env(safe-area-inset-bottom)); left: 50%; transform: translateX(-50%); background: #303034; color: white; padding: 12px 20px; border-radius: 8px; font-size: .875rem; max-width: calc(100% - 32px); z-index: 20; }
.toast:empty { display: none; }
.error-banner { margin-bottom: 18px; padding: 12px 0; color: var(--danger); font-size: .875rem; }
.error-banner:empty { display: none; }
dialog { border: 0; border-radius: 12px; padding: 0; color: var(--ink); width: min(520px,calc(100% - 28px)); max-height: 85dvh; }
dialog::backdrop { background: #0005; }
.dialog-header { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 20px 24px 14px; border-bottom: 1px solid var(--line); }
.dialog-header h2 { font-size: 1.1875rem; font-weight: 650; }
.close-button { width: 44px; height: 44px; background: var(--field); font-size: 1.5rem; font-weight: 400; flex: none; }
.dialog-content { padding: 20px 24px 24px; }
.select-list { display: grid; max-height: 240px; overflow: auto; margin-bottom: 24px; }
.exercise-choice { display: flex; align-items: center; justify-content: space-between; min-height: 54px; background: var(--surface); border-bottom: 1px solid var(--line); border-radius: 0; text-align: left; padding: 12px 0; gap: 10px; }
.exercise-choice span:first-child { overflow-wrap: anywhere; }
.choice-action { font-size: .875rem; color: var(--accent); white-space: nowrap; font-weight: 500; }
.register-title { font-size: .875rem; margin-bottom: 16px; font-weight: 600; }
.form-field { display: block; margin-bottom: 16px; font-size: .875rem; }
.form-field input, .form-field select { display: block; width: 100%; margin-top: 6px; border: 0; background: var(--field); border-radius: 8px; padding: 12px; min-height: 48px; font-size: 1rem; }
.inline-error { font-size: .875rem; color: var(--danger); margin-bottom: 14px; white-space: pre-wrap; }
.inline-error:empty { display: none; }
.search-field { border: 0; background: var(--field); border-radius: 8px; padding: 10px 12px; width: 100%; min-height: 44px; font-size: 1rem; margin-bottom: 16px; }
.dialog-explainer { font-size: .875rem; color: var(--muted); margin-bottom: 16px; }
@media (max-width: 760px) {
  .topbar { min-height: 64px; padding-left: 20px; padding-right: 20px; }
  .shell { padding: 24px 16px max(48px,env(safe-area-inset-bottom)); }
  .date-title { font-size: 1.875rem; }
  .datebar { margin-bottom: 20px; gap: 14px; }
  .date-controls { width: 100%; justify-content: space-between; }
  .date-controls .button { font-size: .875rem; padding: 8px; }
  .layout { grid-template-columns: minmax(0,1fr); gap: 24px; }
  .body-tabs { margin-bottom: 18px; }
  .exercise-header { padding: 20px 20px 8px; }
  .sets { padding: 0 20px; }
  .set-main { grid-template-columns: 20px minmax(0,1fr) 10px minmax(0,1fr); gap: 8px; }
  .set-details, .row-actions, .set-validation { margin-left: 28px; }
  .input-unit { padding-right: 10px; }
  .number-input { padding-left: 10px; }
  .add-set { margin-left: 20px; margin-right: 20px; }
  .comment-box { padding: 16px 20px 0; }
  .exercise-footer { padding: 16px 20px 20px; }
  .aside { display: block; }
  .session-summary { padding: 18px 20px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px; }
  .summary-numbers { margin: 0; gap: 20px; }
  .summary-item strong { font-size: 1.5rem; display: inline; margin-right: 4px; }
  .summary-footer { width: 100%; }
  .quiet-note { display: none; }
}
@media (max-width: 365px) {
  .storage-note { display: none; }
  .exercise-header, .sets { padding-left: 16px; padding-right: 16px; }
  .number-input { font-size: 1.25rem; padding: 10px 8px; }
  .set-details { gap: 0; }
  .row-status { width: 100%; }
}
@media (prefers-reduced-motion: no-preference) {
  button { transition: background .15s; }
}
/* History, analysis and exercise management share the recording screen's neutral palette. */
.topbar-actions { display: flex; align-items: center; gap: 16px; }
.shell { padding-bottom: max(120px, calc(env(safe-area-inset-bottom) + 100px)); }
.secondary-shell { max-width: 920px; }
.bottom-nav { position: fixed; bottom: 0; left: 0; right: 0; z-index: 10; display: flex; justify-content: center; gap: 8px; background: #fff; border-top: 1px solid var(--line); padding: 6px 16px max(6px, env(safe-area-inset-bottom)); }
.nav-tab { flex: 1; max-width: 220px; min-height: 48px; color: var(--muted); background: transparent; }
.nav-tab[aria-current=page] { color: var(--accent); background: var(--field); }
.toast { bottom: max(82px, calc(env(safe-area-inset-bottom) + 70px)); }
.page-view { display: grid; gap: 20px; min-width: 0; }
.page-title { font-size: 1.75rem; font-weight: 700; letter-spacing: -.025em; }
.section-title { font-size: 1.0625rem; font-weight: 600; }
.panel { min-width: 0; background: var(--surface); border-radius: 12px; padding: 24px; }
.panel h2 { font-size: 1.0625rem; font-weight: 600; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.filters, .period-controls { display: flex; flex-wrap: wrap; gap: 16px; align-items: end; }
.filter-field { display: grid; gap: 6px; font-size: .875rem; color: var(--muted); flex: 1; min-width: 0; }
.filter-field input, .filter-field select { min-height: 48px; border: 0; border-radius: 8px; font-size: 1rem; padding: 10px; width: 100%; min-width: 0; }
.period-controls > .filter-field { flex-basis: 180px; }
.period-controls > .inline-error { width: 100%; }
.month-controls { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 16px; }
.month-controls input { min-width: 0; width: 12rem; max-width: 60%; min-height: 44px; font-size: 1rem; border: 0; background: var(--field); border-radius: 8px; padding: 8px; }
.calendar { display: grid; grid-template-columns: repeat(7,minmax(0,1fr)); gap: 4px; }
.calendar-weekday { color: var(--muted); text-align: center; font-size: .875rem; padding: 8px 0; }
.calendar-day { flex-direction: column; gap: 0; padding: 4px 0; min-height: 54px; border-radius: 6px; background: transparent; font-weight: 500; font-size: 1rem; min-width: 0; }
.calendar-day[data-actual=true] { background: var(--field); }
.calendar-day[aria-current=date] { outline: 1px solid var(--accent); outline-offset: -1px; }
.calendar-mark { color: var(--accent); line-height: 1; min-height: 14px; font-size: .75rem; }
.button:disabled { opacity: .55; }
.history-list, .numeric-list, .manage-list { display: grid; gap: 1px; border-radius: 10px; overflow: hidden; min-width: 0; }
.page-heading, .history-day-heading { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px; }
.history-list { gap: 16px; border-radius: 0; overflow: visible; }
.history-item { min-width: 0; background: white; border-radius: 10px; padding: 8px 16px 12px; }
.history-day-heading h3 { font-size: 1rem; font-weight: 600; font-variant-numeric: tabular-nums; }
.history-day-heading .button { font-size: .875rem; }
.history-filters { display: grid; gap: 16px; }
.history-scroll { overflow-x: auto; overscroll-behavior-x: contain; padding-bottom: 4px; }
.history-exercises { border-collapse: separate; border-spacing: 0; width: 100%; text-align: left; }
.history-exercises th, .history-exercises td { border-top: 1px solid var(--line); padding: 12px 14px; vertical-align: middle; }
.history-exercises th { padding-left: 0; font-size: .875rem; font-weight: 500; width: 180px; min-width: 140px; max-width: 180px; overflow-wrap: anywhere; position: sticky; left: 0; z-index: 1; background: white; }
.history-exercises td { white-space: nowrap; }
.set-summary { display: inline-flex; align-items: baseline; gap: 5px; white-space: nowrap; font-size: .875rem; font-variant-numeric: tabular-nums; }
.set-index { color: var(--muted); font-size: .6875rem; margin-right: 3px; }
.set-index::before { content: 'S'; }
.drop-mark { color: var(--muted); font-size: .6875rem; }
.drop-mark::before { content: '('; }
.drop-mark::after { content: ')'; }
.empty-message { padding: 28px 16px; background: white; border-radius: 10px; color: var(--muted); }
.detail-card { display: grid; gap: 12px; }
.detail-set { padding: 12px 0; border-bottom: 1px solid var(--line); }
.detail-set strong { font-weight: 600; font-size: .875rem; }
.detail-comment { white-space: pre-wrap; overflow-wrap: anywhere; font-size: .9375rem; }
.inline-actions, .dialog-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.inline-actions .button { padding-left: 0; padding-right: 12px; font-size: .875rem; }
.dialog-actions { justify-content: flex-end; margin-top: 24px; }
.danger { background: var(--danger); color: white; }
.danger-text { background: transparent; color: var(--danger); }
.dialog-content > p { margin-bottom: 12px; }
.segmented { display: flex; padding: 3px; border-radius: 8px; background: #eaeaec; }
.segmented .button { background: transparent; flex: 1; color: var(--muted); }
.segmented [aria-pressed=true] { background: white; color: var(--ink); }
.range-label { font-size: .875rem; color: var(--muted); }
.metric-summary { display: flex; align-items: baseline; gap: 12px; }
.metric-summary strong { font-size: 2.5rem; font-weight: 600; font-variant-numeric: tabular-nums; }
.chart { display: block; width: 100%; height: auto; overflow: visible; margin-top: 16px; }
.chart-grid { stroke: var(--line); stroke-width: 1; }
.chart-label { fill: var(--muted); font: 18px system-ui; }
.growth-line { fill: none; stroke: var(--accent); stroke-width: 2; }
.growth-dot, .frequency-bar { fill: var(--accent); }
.growth-dot { stroke: white; stroke-width: 1.5; }
.month-boundary { stroke: #a2a8b1; stroke-width: 1; stroke-dasharray: 3 4; }
.month-band { fill: #f2f3f5; }
.month-divider { stroke: #b7bbc2; stroke-width: 1; }
.month-label { fill: var(--ink); font-size: 18px; font-weight: 600; }
.workout-date-label { font-size: 15px; fill: var(--ink); }
.range-endpoint { font-size: 13px; }
.selected-date-guide { stroke: var(--accent); stroke-width: 1; stroke-dasharray: 2 3; pointer-events: none; }
.axis-tick { stroke: #8b9099; stroke-width: 1; }
.volume-set-1 { fill: #8ba8d0; }
.volume-set-2 { fill: #d2deee; }
.volume-zero { stroke: #8ba8d0; stroke-width: 3; }
.chart-legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: .8125rem; color: var(--muted); margin-top: 12px; }
.chart-legend > span { display: inline-flex; align-items: center; gap: 6px; }
.chart-legend > span::before { content: ''; width: 14px; height: 10px; flex: none; }
.legend-weight::before { background: var(--accent); height: 2px !important; }
.legend-first::before { background: #8ba8d0; }
.legend-second::before { background: #d2deee; }
.growth-chart-scroll { overflow-x: auto; overscroll-behavior-x: contain; }
.growth-chart { min-width: 320px; max-width: 640px; margin: 10px auto 0; }
.graph-panel > p { margin-top: 8px; }
.chart-hit { fill: transparent; cursor: pointer; }
.chart [role=button]:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
.chart-detail { display: grid; gap: 8px; font-size: .9375rem; overflow-wrap: anywhere; }
.chart-detail:not(:empty) { padding: 16px 0; }
.chart-detail .button { justify-self: start; }
.numeric-row { width: 100%; min-width: 0; background: white; border-radius: 0; justify-content: space-between; text-align: left; font-size: .9375rem; font-weight: 400; padding: 14px 16px; }
.growth-row { display: flex; align-items: center; min-width: 0; background: white; gap: 12px; padding: 8px 12px; }
.growth-summary { flex: none; background: transparent; color: var(--ink); font-size: .8125rem; font-weight: 600; padding: 8px 0; min-width: 48px; min-height: 44px; font-variant-numeric: tabular-nums; }
.growth-sets { display: flex; min-width: 0; gap: 18px; overflow-x: auto; overscroll-behavior-x: contain; padding: 12px 0; }
.date-links { display: flex; flex-wrap: wrap; gap: 8px; }
.manage-list { gap: 12px; }
.manage-item { display: grid; gap: 8px; }
.manage-item h3 { font-size: 1.0625rem; font-weight: 600; overflow-wrap: anywhere; }
.draft-notice { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; font-size: .875rem; color: var(--muted); margin-bottom: 12px; }
@media (max-width: 760px) {
  .panel { padding: 20px 16px; }
  .topbar-actions { gap: 4px; }
  .topbar-actions .storage-note { display: none; }
  .calendar { gap: 2px; }
  .month-controls .button { padding: 8px 4px; font-size: .875rem; }
  .filters { gap: 10px; }
  .numeric-head, .numeric-row { padding-left: 12px; padding-right: 12px; }
}
@media (max-width: 365px) { .filters { flex-direction: column; align-items: stretch; } .calendar-day { font-size: .875rem; } }

html { scroll-padding-bottom: 100px; }
.chart-detail { scroll-margin-bottom: 100px; }
.backup-panel { display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; }
.backup-panel > .button { justify-self: start; }
.backup-panel input[type=file] { width: 100%; min-width: 0; font-size: 1rem; min-height: 44px; }
.backup-status { white-space: pre-wrap; font-size: .9375rem; }
.backup-status:empty, .restore-preview:empty { display: none; }
.restore-preview { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; border-top: 1px solid var(--line); padding-top: 20px; }
.restore-agreement { display: flex; align-items: center; gap: 12px; min-height: 48px; font-size: .9375rem; }
.restore-agreement input { min-width: 20px; height: 20px; }
.install-guide { max-width: 540px; margin: 40px auto; padding: 24px; display: grid; gap: 20px; }