/* ── tokens ─────────────────────────────────────────── */
:root {
  --bg:          #f8f9fb;
  --surface:     #ffffff;
  --border:      rgba(0,0,0,.08);
  --border-card: rgba(0,0,0,.07);
  --ink:         #1a1a1e;
  --ink-2:       #44444a;
  --muted:       #8e8e95;
  --orange:      #ff6f1a;
  --orange-10:   rgba(255,111,26,.10);
  --orange-20:   rgba(255,111,26,.20);
  --radius-sm:   8px;
  --radius:      14px;
  --radius-lg:   20px;
  --shadow-card: 0 2px 0 var(--border-card),
                 0 8px 24px rgba(0,0,0,.06);
  --shadow-img:  0 2px 0 rgba(0,0,0,.06),
                 0 20px 48px rgba(0,0,0,.10);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC",
               "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  font-synthesis: none;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { margin: 0; -webkit-font-smoothing: antialiased; background: var(--bg); }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
h1, h2, p { margin: 0; }
button { cursor: pointer; font: inherit; }
a:focus-visible, button:focus-visible {
  outline: 3px solid var(--orange); outline-offset: 3px;
}
::selection { background: var(--orange-20); }

/* ── skip link ── */
.skip-link {
  position: fixed; top: -80px; left: 16px; z-index: 40;
  background: var(--surface); padding: 12px 18px;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
}
.skip-link:focus { top: 12px; }

/* ── layout ── */
.wrap { max-width: 1200px; margin-inline: auto; padding-inline: 48px; }

/* ── nav ─────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 30;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px; margin-inline: auto; padding-inline: 48px;
  height: 68px; display: flex; align-items: center;
  justify-content: space-between; gap: 24px;
}
.nav-brand {
  display: flex; align-items: center; gap: 9px;
  font-size: 18px; font-weight: 700; letter-spacing: -.4px;
}
.nav-brand img { border-radius: 8px; }
.nav-links { display: flex; gap: 28px; }
.nav-links a {
  font-size: 13px; color: var(--muted);
  transition: color .15s;
}
.nav-links a:hover { color: var(--ink); }
.nav-cta {
  font-size: 13px; font-weight: 600; color: var(--orange);
  padding: 8px 18px;
  border: 1.5px solid var(--orange);
  border-radius: var(--radius-sm);
  transition: background .15s, color .15s;
}
.nav-cta:hover { background: var(--orange); color: #fff; }

/* ── buttons ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 10px; font-size: 14px; font-weight: 600;
  padding: 13px 24px; border-radius: var(--radius-sm);
  transition: transform .15s, box-shadow .15s, background .15s;
  border: none;
}
.btn:active { transform: scale(.97); }
.btn-primary {
  background: var(--orange); color: #fff;
  box-shadow: 0 1px 0 rgba(0,0,0,.14), 0 4px 12px var(--orange-20);
}
.btn-primary:hover {
  background: #f06010;
  box-shadow: 0 1px 0 rgba(0,0,0,.14), 0 6px 18px var(--orange-20);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent; color: var(--ink-2);
  box-shadow: inset 0 0 0 1.5px var(--border);
}
.btn-ghost:hover { box-shadow: inset 0 0 0 1.5px rgba(0,0,0,.18); }
.btn-lg { padding: 16px 36px; font-size: 15px; border-radius: 10px; }

/* ── hero ─────────────────────────────────────────────── */
.hero {
  padding-top: 60px;
  padding-bottom: 0;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 48px;
}
.hero-inner {
  text-align: center;
  max-width: 800px;
  margin-inline: auto;
  padding-bottom: 40px;
}
.hero-inner h1 {
  font-size: clamp(34px, 4.8vw, 58px);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -2px;
  color: var(--ink);
}
.hero-sub {
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink-2);
  margin-top: 18px;
  max-width: 640px;
  margin-inline: auto;
}
.hero-btns {
  display: flex; gap: 12px; justify-content: center;
  flex-wrap: wrap; margin-top: 28px;
}
.hero-note {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  font-size: 12px; color: var(--muted); margin-top: 16px;
}
.live-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: #34c759;
  box-shadow: 0 0 0 2px rgba(52,199,89,.2);
  flex-shrink: 0;
}
.hero-shot {
  background: var(--surface);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  border: 1px solid var(--border);
  border-bottom: none;
  overflow: hidden;
  box-shadow: 0 -2px 0 rgba(0,0,0,.03), 0 -12px 40px rgba(0,0,0,.07);
}
.hero-shot img {
  width: 100%;
  height: auto;
  display: block;
}

/* ── strip ─────────────────────────────────────────────── */
.strip {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.strip-inner {
  max-width: 1200px; margin-inline: auto; padding-inline: 48px;
  min-height: 68px; display: flex; align-items: center;
  justify-content: space-between; gap: 24px; flex-wrap: wrap;
  padding-block: 16px;
}
.strip-label { font-size: 13px; color: var(--muted); }
.strip-types {
  display: flex; gap: 24px; flex-wrap: wrap;
}
.strip-types span {
  display: flex; align-items: center; gap: 7px;
  font-size: 13px; color: var(--ink-2);
}
.dot {
  width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0;
}
.dot-text  { background: #d5a52e; }
.dot-code  { background: #4288d7; }
.dot-link  { background: #4b9c78; }
.dot-image { background: #db6177; }
.dot-file  { background: #dc8950; }

/* ── feature sections ─────────────────────────────────── */
.feat {
  max-width: 1200px; margin-inline: auto; padding-inline: 48px;
  display: grid; grid-template-columns: minmax(300px, 380px) 1fr;
  gap: 72px; align-items: center;
  padding-block: 80px;
  border-bottom: 1px solid var(--border);
}
.feat-reverse { direction: rtl; }
.feat-reverse > * { direction: ltr; }

.feat-num {
  font-size: 11px; font-weight: 700;
  letter-spacing: .1em; color: var(--orange);
  margin-bottom: 14px;
}
.feat-copy h2 {
  font-size: clamp(24px, 2.4vw, 30px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.5px;
  color: var(--ink);
  text-wrap: balance;
}
.feat-copy p {
  font-size: 15px; line-height: 1.75; color: var(--ink-2);
  margin-top: 14px; max-width: 360px;
  text-wrap: pretty;
}
.feat-media figure { margin: 0; }
.feat-media img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow-img);
  border: 1px solid var(--border);
}

/* ── privacy ─────────────────────────────────────────── */
.privacy-sect {
  background: var(--ink);
  color: #f0f0f4;
}
.privacy-inner {
  max-width: 1200px; margin-inline: auto; padding-inline: 48px;
  padding-block: 80px;
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 80px; align-items: start;
}
.privacy-copy .feat-num { color: #ff8c45; }
.privacy-copy h2 {
  font-size: clamp(24px, 2.4vw, 30px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.5px;
  margin-top: 12px;
  text-wrap: balance;
}
.privacy-copy p {
  font-size: 15px; line-height: 1.8;
  color: rgba(240,240,244,.65);
  margin-top: 16px; margin-bottom: 32px;
  max-width: 380px;
}
.privacy-copy .btn-primary { background: var(--orange); }

.privacy-cards {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column; gap: 0;
  border-top: 1px solid rgba(255,255,255,.1);
}
.privacy-cards li {
  padding: 28px 0;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.privacy-cards strong {
  display: block; font-size: 16px; font-weight: 600;
  color: #f5f5f7;
}
.privacy-cards p {
  font-size: 13px; line-height: 1.8;
  color: rgba(240,240,244,.55);
  margin-top: 6px;
}

/* ── faq ─────────────────────────────────────────────── */
.faq-sect {
  border-bottom: 1px solid var(--border);
}
.faq-inner {
  max-width: 1200px; margin-inline: auto; padding-inline: 48px;
  padding-block: 72px;
  display: grid; grid-template-columns: 1fr 2fr;
  gap: 64px; align-items: start;
}
.faq-lead h2 {
  font-size: clamp(24px, 2.5vw, 32px);
  font-weight: 700; letter-spacing: -.6px;
  position: sticky; top: 90px;
}
.faq-list { margin: 0; padding: 0; }
.faq-list > div { border-bottom: 1px solid var(--border); }
.faq-list > div:first-child { border-top: 1px solid var(--border); }
.faq-list dt { margin: 0; }
.faq-list dt button {
  width: 100%;
  display: flex; justify-content: space-between; align-items: center;
  gap: 16px; padding: 20px 0;
  background: none; border: none;
  font-size: 15px; font-weight: 500; text-align: left;
  color: var(--ink);
}
.faq-list dt button span {
  font-size: 20px; color: var(--muted);
  font-weight: 300; flex-shrink: 0; line-height: 1;
  transition: transform .2s;
}
.faq-list dt button[aria-expanded="true"] span { transform: rotate(45deg); }
.faq-list dd {
  margin: 0; padding-bottom: 20px;
  font-size: 14px; line-height: 1.8; color: var(--ink-2);
  max-width: 560px;
}

/* ── closing ─────────────────────────────────────────── */
.closing {
  max-width: 1200px; margin-inline: auto; padding-inline: 48px;
  padding-block: 88px;
  text-align: center;
}
.closing h2 {
  font-size: clamp(32px, 4.5vw, 58px);
  font-weight: 700; line-height: 1.15;
  letter-spacing: -2px;
}
.closing .btn-lg { margin-top: 36px; }

/* ── footer ─────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
}
.footer-inner {
  max-width: 1200px; margin-inline: auto; padding-inline: 48px;
  min-height: 80px; display: flex; align-items: center;
  justify-content: space-between; gap: 16px;
}
.footer-inner p, .footer-inner a:last-child {
  font-size: 12px; color: var(--muted);
}
.footer-inner a:last-child:hover { color: var(--orange); }

/* ── faq interaction ── */
.faq-list dd[hidden] { display: none; }

/* ── responsive ─────────────────────────────────────── */
@media (max-width: 960px) {
  .wrap, .nav-inner, .hero, .strip-inner,
  .feat, .privacy-inner, .faq-inner, .closing, .footer-inner {
    padding-inline: 30px;
  }
  .feat, .feat-reverse { grid-template-columns: 1fr; gap: 40px; direction: ltr; }
  .feat-copy p { max-width: 100%; }
  .privacy-inner { grid-template-columns: 1fr; gap: 52px; }
  .faq-inner { grid-template-columns: 1fr; gap: 40px; }
  .faq-lead h2 { position: static; }
}
@media (max-width: 640px) {
  .wrap, .nav-inner, .hero, .strip-inner,
  .feat, .privacy-inner, .faq-inner, .closing, .footer-inner {
    padding-inline: 20px;
  }
  .nav-links { display: none; }
  .hero { padding-top: 64px; }
  .hero-inner { padding-bottom: 40px; }
  .hero-inner h1 { letter-spacing: -1.5px; }
  .hero-sub { font-size: 16px; }
  .hero-btns { flex-direction: column; align-items: center; }
  .feat { padding-block: 72px; }
  .privacy-inner { padding-block: 72px; }
  .faq-inner { padding-block: 64px; }
  .closing { padding-block: 80px; }
  .strip-inner { flex-direction: column; align-items: flex-start; gap: 12px; }
  .footer-inner { flex-wrap: wrap; padding-block: 24px; }
  .footer-inner p { order: 3; width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}