/* ---------- design tokens ---------- */
:root {
  --bg:           #ffffff;
  --fg:           #1d1d1f;
  --fg-muted:     #6e6e73;
  --border:       #e5e5e7;
  --surface:      #f5f5f7;
  --surface-soft: #fafafa;
  --accent:       #007aff;
  --accent-fg:    #ffffff;
  --warn:         #ff9500;
  --warn-bg:      #fff4e5;
  --code-bg:      #f5f5f7;
  --max-width:    760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:           #1d1d1f;
    --fg:           #f5f5f7;
    --fg-muted:     #a1a1a6;
    --border:       #2c2c2e;
    --surface:      #2c2c2e;
    --surface-soft: #232325;
    --accent:       #0a84ff;
    --accent-fg:    #ffffff;
    --warn:         #ff9f0a;
    --warn-bg:      #3a2a10;
    --code-bg:      #2c2c2e;
  }
}

/* ---------- base ---------- */
* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: 'Pretendard Variable', Pretendard,
               -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  font-size: 18px;
  line-height: 1.65;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main, header, footer { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.015em; }
h1 { font-size: 2.8rem; margin: 0 0 14px; font-weight: 800; }
h2 { font-size: 1.75rem; margin: 96px 0 20px; font-weight: 700; }
h3 { font-size: 1.1rem; margin: 24px 0 8px; font-weight: 600; }

p { margin: 0 0 16px; color: var(--fg); }
p.lead { font-size: 1.25rem; line-height: 1.55; color: var(--fg-muted); margin: 0 auto 36px; max-width: 540px; }
p.section-lead { font-size: 1.1rem; color: var(--fg-muted); margin-bottom: 28px; max-width: 640px; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

em { font-style: normal; font-weight: 600; color: var(--fg); }

code, pre {
  font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  font-size: 0.9em;
}
code { background: var(--code-bg); padding: 2px 6px; border-radius: 4px; }
pre {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  padding: 14px 16px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 16px 0;
  font-size: 0.85rem;
}
pre code { background: transparent; padding: 0; }

ul, ol { padding-left: 22px; margin: 0 0 16px; }
li { margin-bottom: 8px; }

/* ---------- header (hero) ---------- */
header {
  padding-top: 112px;
  padding-bottom: 24px;
  text-align: center;
}

header .appicon {
  width: 144px;
  height: 144px;
  margin-bottom: 28px;
  border-radius: 32px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.16);
}

@media (prefers-color-scheme: dark) {
  header .appicon { box-shadow: 0 16px 40px rgba(0, 0, 0, 0.55); }
}

header .cta { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin-top: 8px; }

.cta--inline { margin: 0 0 32px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.98rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.05s ease, box-shadow 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
  box-shadow: 0 4px 14px rgba(0, 122, 255, 0.25);
}
.btn-primary:hover { box-shadow: 0 6px 18px rgba(0, 122, 255, 0.35); }
.btn-secondary {
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
}
.btn-secondary:hover { background: var(--surface); }
.btn[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
  box-shadow: none;
}

/* ---------- features grid ---------- */
.features {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
  margin: 8px 0 0;
}
.features li {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 22px;
  margin: 0;
}
.features strong { display: block; margin-bottom: 6px; font-size: 1.02rem; }
.features span { color: var(--fg-muted); font-size: 0.95rem; line-height: 1.55; }

/* ---------- screenshots (CSS recreations of macOS UI) ---------- */
.shot { margin: 28px 0 48px; text-align: center; }
.shot figcaption {
  color: var(--fg-muted);
  font-size: 0.88rem;
  margin-top: 14px;
}

/* Shared design tokens for the UI recreations. Tracks site theme so
   the mockups blend into the page instead of looking like a pasted
   screenshot. Light-mode site → light macOS UI. Dark-mode site →
   dark macOS UI. */
.ui {
  --ui-bg:       #ffffff;
  --ui-sunken:   #f5f5f7;
  --ui-fg:       #1d1d1f;
  --ui-muted:    #6e6e73;
  --ui-line:     #e4e4e6;
  --ui-line-2:   #d2d2d7;
  --ui-accent:   #007aff;
  --ui-on-accent:#ffffff;
  --ui-banner:   #eaf2ff;
  --ui-shadow:   0 1px 1px rgba(0, 0, 0, 0.04),
                 0 8px 24px rgba(0, 0, 0, 0.08);
  font-family: 'Pretendard Variable', Pretendard,
               -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  font-size: 13px;
  color: var(--ui-fg);
  text-align: left;
  margin: 0 auto;
}
@media (prefers-color-scheme: dark) {
  .ui {
    --ui-bg:       #2a2a2c;
    --ui-sunken:   #1f1f21;
    --ui-fg:       #f5f5f7;
    --ui-muted:    #a1a1a6;
    --ui-line:     #3a3a3c;
    --ui-line-2:   #48484a;
    --ui-accent:   #0a84ff;
    --ui-banner:   #1a2c4a;
    --ui-shadow:   0 1px 1px rgba(0, 0, 0, 0.6),
                   0 12px 32px rgba(0, 0, 0, 0.45);
  }
}

/* ---------- menubar dropdown ---------- */
.ui-menu {
  max-width: 260px;
  background: var(--ui-bg);
  border-radius: 10px;
  padding: 5px;
  box-shadow: var(--ui-shadow);
}
.ui-menu__item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 10px;
  border-radius: 5px;
  cursor: default;
}
.ui-menu__item span:not(.ui-menu__icon) { flex: 1; }
.ui-menu__item--active {
  background: var(--ui-accent);
  color: var(--ui-on-accent);
}
.ui-menu__item--active kbd { color: rgba(255, 255, 255, 0.85); }
.ui-menu__icon {
  display: inline-block;
  width: 16px;
  text-align: center;
  color: var(--ui-muted);
  font-size: 12px;
}
.ui-menu__item kbd {
  font: inherit;
  color: var(--ui-muted);
  background: transparent;
  padding: 0;
  letter-spacing: 0.02em;
}
.ui-menu__sep {
  height: 1px;
  background: var(--ui-line);
  margin: 4px 8px;
}

/* ---------- window ---------- */
.ui-window {
  max-width: 560px;
  background: var(--ui-bg);
  border-radius: 12px;
  box-shadow: var(--ui-shadow);
  overflow: hidden;
}
.ui-window__chrome {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 14px;
  background: var(--ui-sunken);
  border-bottom: 1px solid var(--ui-line);
}
.ui-window__dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}
.ui-window__dot--close { background: #ff5f57; }
.ui-window__dot--min   { background: #febc2e; }
.ui-window__dot--max   { background: #28c840; }
.ui-window__title {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-weight: 600;
  color: var(--ui-fg);
}

.ui-window__body {
  padding: 20px 22px 18px;
  background: var(--ui-bg);
}
.ui-h {
  font-size: 14px;
  font-weight: 700;
  margin: 14px 0 10px;
  color: var(--ui-fg);
}
.ui-h:first-child { margin-top: 0; }

/* welcome banner */
.ui-banner {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--ui-banner);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 18px;
}
.ui-banner__icon {
  flex-shrink: 0;
  color: var(--ui-accent);  /* drives the SVG fill via currentColor */
}
.ui-banner__text { flex: 1; }
.ui-banner__text strong { display: block; font-size: 13px; margin-bottom: 3px; }
.ui-banner__text p {
  margin: 0;
  font-size: 12px;
  line-height: 1.45;
  color: var(--ui-fg);
}
.ui-banner__text em { font-weight: 600; font-style: normal; }
.ui-banner__close {
  border: none;
  background: transparent;
  color: var(--ui-muted);
  font-size: 11px;
  width: 18px; height: 18px;
  border-radius: 50%;
  cursor: default;
  flex-shrink: 0;
}

/* rows: TextField + count + stepper */
.ui-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 8px 0;
}
.ui-row--muted .ui-input { color: var(--ui-muted); }
.ui-input {
  flex: 1;
  padding: 5px 9px;
  border: 1px solid var(--ui-line-2);
  border-radius: 5px;
  background: var(--ui-bg);
  color: var(--ui-fg);
  font: inherit;
}
.ui-count {
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  min-width: 18px;
  text-align: right;
}
.ui-stepper {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  width: 14px;
  height: 22px;
  color: var(--ui-muted);
  font-size: 8px;
  line-height: 1;
}
.ui-remove {
  color: var(--ui-muted);
  font-size: 14px;
  margin-left: 2px;
}

.ui-divider {
  height: 1px;
  background: var(--ui-line);
  margin: 16px 0 12px;
}

/* checkbox row */
.ui-check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  margin: 4px 0 12px;
  color: var(--ui-fg);
}
.ui-check__box {
  width: 16px; height: 16px;
  background: var(--ui-accent);
  color: #fff;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
}

.ui-danger {
  border: 1px solid var(--ui-line-2);
  background: var(--ui-bg);
  color: var(--ui-fg);
  border-radius: 5px;
  padding: 4px 12px;
  font: inherit;
  cursor: default;
}

.ui-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 18px;
}
.ui-btn {
  border: 1px solid var(--ui-line-2);
  background: var(--ui-bg);
  color: var(--ui-fg);
  border-radius: 6px;
  padding: 5px 16px;
  font: inherit;
  cursor: default;
}
.ui-btn--primary {
  background: var(--ui-accent);
  border-color: var(--ui-accent);
  color: var(--ui-on-accent);
}

/* ---------- install (dev-details collapsible) ---------- */
.dev-details {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
  margin: 8px 0 0;
}
.dev-details > summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--fg);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
.dev-details > summary::-webkit-details-marker { display: none; }
.dev-details > summary::before {
  content: '›';
  display: inline-block;
  color: var(--fg-muted);
  font-size: 1.2rem;
  line-height: 1;
  transition: transform 0.15s ease;
}
.dev-details[open] > summary::before { transform: rotate(90deg); }
.dev-details > *:not(summary) { margin-top: 14px; }
.dev-details pre { background: var(--bg); }

/* ---------- step list ---------- */
ol.steps { padding-left: 0; counter-reset: step; list-style: none; }
ol.steps li {
  counter-increment: step;
  position: relative;
  padding-left: 44px;
  margin-bottom: 16px;
  min-height: 32px;
}
ol.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: -2px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

/* ---------- FAQ ---------- */
details {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
  margin-bottom: 12px;
  background: var(--bg);
}
details[open] { background: var(--surface-soft); }
details summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 1rem;
}
details summary::-webkit-details-marker { display: none; }
details summary::after {
  content: '＋';
  color: var(--fg-muted);
  font-weight: 400;
  font-size: 1.1rem;
  transition: transform 0.15s ease;
}
details[open] summary::after { content: '－'; }
details > *:not(summary) { margin-top: 14px; }
details.nested {
  margin-top: 12px;
  padding: 10px 14px;
  background: var(--bg);
  border-radius: 8px;
}
details.nested summary { font-size: 0.9rem; font-weight: 500; }
details.nested pre { font-size: 0.8rem; margin: 10px 0 0; }

/* ---------- compatibility checklist ---------- */
ul.checklist {
  list-style: none;
  padding: 0;
  margin: 0;
}
ul.checklist li {
  padding-left: 30px;
  position: relative;
  margin-bottom: 12px;
}
ul.checklist li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
  font-size: 1.05rem;
}

/* ---------- footer ---------- */
footer {
  padding: 96px 24px 64px;
  text-align: center;
  color: var(--fg-muted);
  font-size: 0.88rem;
  margin-top: 80px;
  border-top: 1px solid var(--border);
}
footer a { color: var(--fg-muted); }
footer a:hover { color: var(--fg); }
footer .sep { margin: 0 8px; opacity: 0.5; }

/* ---------- responsive tweaks ---------- */
@media (max-width: 600px) {
  body { font-size: 17px; }
  h1 { font-size: 2.3rem; }
  h2 { font-size: 1.5rem; margin-top: 72px; }
  header { padding-top: 80px; }
  header .appicon { width: 124px; height: 124px; }
  p.lead { font-size: 1.1rem; }
}