/* Reset + varijable */
:root {
  --bg: #ffffff;
  --fg: #0b0b0f;
  --muted: #5b5b66;
  --brand: #2563eb;
  --card: #f6f7f9;
  --ring: rgba(37,99,235,.35);
  --radius: 16px;
  --shadow: 0 8px 20px rgba(0,0,0,.06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0f;
    --fg: #f7f7fa;
    --muted: #a0a0ad;
    --brand: #60a5fa;
    --card: #12121a;
    --ring: rgba(96,165,250,.45);
  }
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: system-ui, -apple-system, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Top bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid rgba(0,0,0,.06);
  padding-top: env(safe-area-inset-top);
}
@media (prefers-color-scheme: dark){
  .topbar { border-bottom-color: rgba(255,255,255,.06); }
}
.topbar__inner {
  max-width: 720px;
  margin: 0 auto;
  height: 56px;
  display: grid;
  grid-template-columns: 48px 1fr 48px;
  align-items: center;
  padding: 0 12px;
}
.brand { font-size: 18px; text-align: center; }

.icon-btn {
  display: grid; place-items: center;
  width: 40px; height: 40px;
  border-radius: 12px;
  background: transparent;
  border: 1px solid transparent;
}
.icon-btn:focus-visible {
  outline: none;
  border-color: var(--ring);
  box-shadow: 0 0 0 4px var(--ring);
}

/* Container & cards */
.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px clamp(12px, 4vw, 20px) calc(24px + env(safe-area-inset-bottom));
}
.card {
  background: var(--card);
  border: 1px solid rgba(0,0,0,.06);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}
@media (prefers-color-scheme: dark){
  .card { border-color: rgba(255,255,255,.06); }
}
.card + .card { margin-top: 12px; }

/* Hero */
.hero {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: center;
}
.hero__art { width: 96px; height: 96px; }
.hero__copy h2 { font-size: 22px; line-height: 1.2; margin-bottom: 6px; }
.hero__copy p { color: var(--muted); font-size: 15px; line-height: 1.5; }

/* Buttons */
.btn {
  appearance: none;
  border: 0;
  border-radius: 12px;
  padding: 12px 16px;
  font-weight: 600;
  margin-top: 12px;
  cursor: pointer;
}
.btn--primary { background: var(--brand); color: white; }
.btn--primary:active { transform: translateY(1px); }
.btn--primary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px var(--ring);
}

/* Lists */
.features { margin-left: 18px; }
.features li { margin: 6px 0; color: var(--fg); }
.features li::marker { color: var(--muted); }

/* Details */
details { margin-top: 8px; }
details[open] { padding-top: 4px; }
.dynamic {
  margin-top: 8px;
  border-radius: 12px;
  background: rgba(37,99,235,.08);
  padding: 12px;
}

/* Bottom sheet */
.sheet {
  position: fixed;
  inset: auto 0 0 0;
  translate: 0 100%;
  background: var(--bg);
  border-top-left-radius: 18px;
  border-top-right-radius: 18px;
  border: 1px solid rgba(0,0,0,.08);
  box-shadow: 0 -8px 20px rgba(0,0,0,.12);
  padding-bottom: max(12px, env(safe-area-inset-bottom));
  transition: translate .28s ease;
}
@media (prefers-color-scheme: dark){
  .sheet { border-color: rgba(255,255,255,.08); box-shadow: 0 -8px 22px rgba(0,0,0,.4); }
}
.sheet[aria-hidden="false"] { translate: 0 0; }
.sheet__handle {
  width: 40px; height: 4px; border-radius: 2px;
  background: rgba(0,0,0,.2);
  margin: 8px auto;
}
@media (prefers-color-scheme: dark){
  .sheet__handle { background: rgba(255,255,255,.25); }
}
.sheet__body {
  max-width: 720px; margin: 0 auto;
  padding: 0 16px 12px;
  display: grid; gap: 8px;
}
.sheet__link {
  display: block;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--card);
  text-decoration: none;
  color: var(--fg);
  border: 1px solid rgba(0,0,0,.06);
}
@media (prefers-color-scheme: dark){
  .sheet__link { border-color: rgba(255,255,255,.06); }
}

/* Footer */
.footer {
  max-width: 720px; margin: 16px auto;
  padding: 0 clamp(12px, 4vw, 20px) calc(16px + env(safe-area-inset-bottom));
  color: var(--muted);
  font-size: 13px;
}

/* Mobile-first typography targeting 390–414px widths */
@media (min-width: 480px) {
  .hero__art { width: 120px; height: 120px; }
  .hero__copy h2 { font-size: 24px; }
  .container { padding: 20px clamp(16px, 4vw, 28px) calc(28px + env(safe-area-inset-bottom)); }
}