:root {
  --orange: #F2600C;
  --orange-deep: #B84A08;
  --orange-tint: #FBE8DA;
  --ink: #22262E;
  --muted: #6B7280;
  --bg: #F7F5F1;
  --card: #FFFFFF;
  --navy: #1B2536;
  --border: rgba(34, 38, 46, 0.13);
  --shadow: 0 24px 80px rgba(27, 37, 54, 0.25);
  --pane-bg: #202A3C;
  --pane-ink: #E8ECF4;
  --pane-muted: #8FA3C4;
}
@media (prefers-color-scheme: dark) {
  :root {
    --orange: #FF8A3D;
    --orange-deep: #FFA05C;
    --orange-tint: #3A2414;
    --ink: #ECEDF0;
    --muted: #9AA3B2;
    --bg: #12161F;
    --card: #1B212D;
    --navy: #0E1420;
    --border: rgba(255, 138, 61, 0.18);
    --shadow: 0 24px 80px rgba(0, 0, 0, 0.6);
  }
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1080px; margin: 0 auto; padding: 0.9rem 1.5rem;
  backdrop-filter: saturate(180%) blur(16px);
}
nav .brand { display: flex; align-items: center; gap: 0.55rem; font-weight: 700; font-size: 1.05rem; text-decoration: none; color: var(--ink); }
nav .brand img { width: 28px; height: 28px; border-radius: 7px; }
nav .links a { color: var(--muted); text-decoration: none; margin-left: 1.4rem; font-size: 0.92rem; }
nav .links a:hover { color: var(--orange-deep); }
nav .lang { margin-left: 1.4rem; font-size: 0.9rem; color: var(--muted); }
nav .lang a { margin: 0 0.15rem; text-decoration: none; color: var(--muted); }
nav .lang a.active { color: var(--ink); font-weight: 700; }
@media (max-width: 720px) {
  nav { flex-direction: column; gap: 0.45rem; padding: 0.7rem 1rem 0.65rem; }
  nav .links { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 0.2rem 1rem; }
  nav .links a { margin-left: 0; font-size: 0.86rem; }
  nav .lang { margin-left: 0; }
  .hero { padding-top: 2.6rem; }
}

.hero {
  max-width: 1080px; margin: 0 auto; padding: 4.5rem 1.5rem 0;
  text-align: center;
}
.hero h1 {
  font-family: "New York", Georgia, "Times New Roman", serif;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 700;
  max-width: 820px; margin: 0 auto;
}
.hero h1 em {
  font-style: italic;
  color: var(--ink);
  background: linear-gradient(transparent 58%, rgba(242, 96, 12, 0.45) 58%, rgba(242, 96, 12, 0.45) 94%, transparent 94%);
  padding: 0 0.06em;
}
.hero p.sub {
  color: var(--muted); font-size: 1.18rem; max-width: 740px;
  margin: 1.2rem auto 0;
}
@media (max-width: 600px) { .desktop-br { display: none; } }

.cta-row { margin-top: 2rem; display: flex; gap: 0.8rem; justify-content: center; flex-wrap: wrap; }
.cta {
  display: inline-flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.15rem;
  background: var(--ink); color: var(--bg);
  padding: 0.85rem 1.5rem; border-radius: 12px;
  text-decoration: none; font-weight: 600; font-size: 0.98rem;
  transition: transform 0.15s ease;
}
.cta:hover { transform: translateY(-1px); }
.cta.secondary { background: transparent; color: var(--ink); border: 1.5px solid var(--border); }
.cta small { display: block; font-weight: 400; opacity: 0.65; font-size: 0.72rem; line-height: 1.3; }
.cta.pending {
  background: transparent; color: var(--muted);
  border: 1.5px dashed var(--border); cursor: default;
}
.cta.pending:hover { transform: none; }

/* ---- Dual-pane app mockup, drawn in CSS ---- */
.mockup-wrap { max-width: 980px; margin: 3.5rem auto 0; padding: 0 1.5rem; position: relative; }
.mockup-wrap::before {
  content: ""; position: absolute; inset: 12% 6% -4%;
  background: radial-gradient(60% 60% at 50% 40%, rgba(242, 96, 12, 0.3), transparent 70%);
  filter: blur(40px); z-index: 0;
}
.mockup {
  position: relative; z-index: 1; text-align: left;
  background: var(--pane-bg); border-radius: 14px;
  box-shadow: var(--shadow); overflow: hidden;
  font-size: 0.82rem; color: var(--pane-ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", sans-serif;
}
.mockup .titlebar {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.6rem 0.9rem; background: rgba(255,255,255,0.04);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.mockup .dots { display: flex; gap: 6px; }
.mockup .dots span { width: 11px; height: 11px; border-radius: 50%; }
.mockup .dots span:nth-child(1) { background: #FF5F57; }
.mockup .dots span:nth-child(2) { background: #FEBC2E; }
.mockup .dots span:nth-child(3) { background: #28C840; }
.mockup .title { flex: 1; text-align: center; color: var(--pane-muted); font-weight: 600; }
.mockup .panes { display: grid; grid-template-columns: 1fr 44px 1fr; min-height: 300px; }
.mockup .pane { padding: 0.7rem 0; }
.mockup .pane-head {
  display: flex; align-items: center; gap: 0.45rem;
  padding: 0 0.9rem 0.55rem; color: var(--pane-muted);
  font-weight: 600; border-bottom: 1px solid rgba(255,255,255,0.07);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.mockup .pane-head .chip {
  font-size: 0.68rem; font-weight: 700; padding: 0.1rem 0.45rem;
  border-radius: 999px; background: rgba(242, 96, 12, 0.22); color: #FFB27E;
  flex: none;
}
.mockup .row {
  display: flex; justify-content: space-between; gap: 0.8rem;
  padding: 0.34rem 0.9rem; color: var(--pane-ink);
  white-space: nowrap; overflow: hidden;
}
.mockup .row .name { overflow: hidden; text-overflow: ellipsis; }
.mockup .row .size { color: var(--pane-muted); flex: none; }
.mockup .row.dim .name { color: var(--pane-muted); }
.mockup .row.hot {
  background: rgba(242, 96, 12, 0.24);
  border-left: 3px solid var(--orange); padding-left: calc(0.9rem - 3px);
}
.mockup .mid {
  display: flex; align-items: center; justify-content: center;
  color: var(--orange); border-left: 1px solid rgba(255,255,255,0.07);
  border-right: 1px solid rgba(255,255,255,0.07);
}
.mockup .statusbar {
  display: flex; justify-content: space-between; gap: 1rem;
  padding: 0.5rem 0.9rem; color: var(--pane-muted);
  background: rgba(255,255,255,0.03); border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 0.75rem;
}
.mockup .bar {
  flex: 1; align-self: center; height: 5px; border-radius: 999px;
  background: rgba(255,255,255,0.1); position: relative; overflow: hidden; max-width: 300px;
}
.mockup .bar::after {
  content: ""; position: absolute; inset: 0 34% 0 0;
  background: linear-gradient(90deg, #F2600C, #FFB25C); border-radius: 999px;
}
@media (max-width: 640px) {
  .mockup .panes { grid-template-columns: 1fr 30px 1fr; }
  .mockup { font-size: 0.7rem; }
  .mockup .row, .mockup .pane-head { padding-left: 0.5rem; padding-right: 0.5rem; }
  .mockup .row.hot { padding-left: calc(0.5rem - 3px); }
}
.mockup-caption { text-align: center; color: var(--muted); font-size: 0.85rem; margin-top: 0.9rem; }

/* ---- Story ---- */
section.story { max-width: 760px; margin: 0 auto; padding: 5rem 1.5rem 1rem; }
h2.section-title { font-family: "New York", Georgia, "Times New Roman", serif; font-size: 2rem; letter-spacing: -0.01em; margin-bottom: 0.5rem; }
p.section-sub { color: var(--muted); max-width: 560px; margin: 0 auto 2.4rem; }
section.story h2 { text-align: center; }
section.story p.section-sub { text-align: center; }
.era { display: flex; gap: 1.3rem; margin-bottom: 2.2rem; }
.era .year {
  flex: none; width: 74px; text-align: right;
  font-family: "New York", Georgia, serif; font-weight: 700; font-size: 1.25rem;
  color: var(--orange-deep); line-height: 1.3;
}
.era .body h3 { font-size: 1.08rem; margin-bottom: 0.35rem; letter-spacing: -0.01em; }
.era .body p { color: var(--muted); font-size: 0.98rem; }
.era.now .year { color: var(--ink); }
.story .punch {
  margin: 2.6rem auto 0; text-align: center;
  font-family: "New York", Georgia, serif; font-size: 1.45rem; line-height: 1.4;
  letter-spacing: -0.01em; max-width: 620px;
}
.story .punch strong { color: var(--orange-deep); }
@media (max-width: 520px) {
  .era { flex-direction: column; gap: 0.3rem; }
  .era .year { text-align: left; width: auto; }
}

/* ---- Features ---- */
section.features { max-width: 1080px; margin: 0 auto; padding: 5rem 1.5rem 1rem; }
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.1rem; }
.feature { background: var(--card); border: 1px solid var(--border); border-radius: 18px; padding: 1.6rem; }
.feature .icon {
  width: 42px; height: 42px; border-radius: 11px;
  background: var(--orange-tint);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 0.9rem;
}
.feature .icon svg { width: 22px; height: 22px; stroke: var(--orange-deep); fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.feature h3 { font-size: 1.04rem; letter-spacing: -0.01em; margin-bottom: 0.35rem; }
.feature p { font-size: 0.94rem; color: var(--muted); }

/* ---- FAQ ---- */
section.faq { max-width: 720px; margin: 0 auto; padding: 4.5rem 1.5rem 2rem; }
.faq details { border-bottom: 1px solid var(--border); padding: 1rem 0.2rem; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 1rem; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq summary::after { content: "+"; color: var(--orange-deep); font-size: 1.3rem; font-weight: 400; }
.faq details[open] summary::after { content: "–"; }
.faq details p { color: var(--muted); font-size: 0.95rem; padding-top: 0.6rem; }

.bottom-cta {
  text-align: center; padding: 4.5rem 1.5rem;
  background: linear-gradient(180deg, transparent, var(--orange-tint));
}
.bottom-cta h2 { font-family: "New York", Georgia, serif; font-size: 1.8rem; letter-spacing: -0.02em; margin-bottom: 0.6rem; }
.bottom-cta p { color: var(--muted); margin-bottom: 1.4rem; }

footer {
  border-top: 1px solid var(--border);
  padding: 2.2rem 1.5rem; text-align: center;
  color: var(--muted); font-size: 0.88rem;
}
footer a { color: var(--orange-deep); text-decoration: none; margin: 0 0.5rem; }
footer .fineprint { display: block; margin-top: 0.8rem; font-size: 0.78rem; opacity: 0.8; }

/* ---- CJK typography (foldic.app convention) ----
   Native sans stacks per language; headlines switch from New York serif to
   heavy gothic (weight 800) — serif CJK reads literary, not product marketing.
   em stays non-italic: slanted CJK is synthetic and ugly; the underline
   highlight carries the emphasis on its own. */

/* Traditional Chinese */
html[lang="zh-Hant"] body {
  font-family: "PingFang TC", "SF Pro TC", -apple-system, BlinkMacSystemFont, "Heiti TC", "Microsoft JhengHei", sans-serif;
  line-height: 1.75;
}
html[lang="zh-Hant"] .hero h1,
html[lang="zh-Hant"] h2.section-title,
html[lang="zh-Hant"] .bottom-cta h2,
html[lang="zh-Hant"] .story .punch,
html[lang="zh-Hant"] .era .year {
  font-family: inherit;
  font-weight: 800;
  letter-spacing: 0.01em;
}
html[lang="zh-Hant"] .hero h1 { line-height: 1.25; }
html[lang="zh-Hant"] .hero h1 em { font-style: normal; }

/* Japanese */
html[lang="ja"] body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro JP", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Meiryo", sans-serif;
  line-height: 1.75;
}
html[lang="ja"] .hero h1,
html[lang="ja"] h2.section-title,
html[lang="ja"] .bottom-cta h2,
html[lang="ja"] .story .punch,
html[lang="ja"] .era .year {
  font-family: inherit;
  font-weight: 800;
  letter-spacing: 0;
}
html[lang="ja"] .hero h1 { line-height: 1.25; }
html[lang="ja"] .hero h1 em { font-style: normal; }

/* Korean */
html[lang="ko"] body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro KR", "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", sans-serif;
  line-height: 1.75;
}
html[lang="ko"] .hero h1,
html[lang="ko"] h2.section-title,
html[lang="ko"] .bottom-cta h2,
html[lang="ko"] .story .punch,
html[lang="ko"] .era .year {
  font-family: inherit;
  font-weight: 800;
  letter-spacing: -0.01em;
}
html[lang="ko"] .hero h1 { line-height: 1.28; }
html[lang="ko"] .hero h1 em { font-style: normal; }
/* Korean wraps on spaces; keep words intact. */
html[lang="ko"] .hero p.sub,
html[lang="ko"] .feature p,
html[lang="ko"] .era .body p,
html[lang="ko"] .faq details p { word-break: keep-all; }

/* ---- Rotating hero headline ---- */
.hero h1 { transition: opacity 0.5s ease; }
.hero h1.fade { opacity: 0; }