:root {
  color-scheme: light;
  --bg: #f5f5f7;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --soft: #86868b;
  --line: rgba(0, 0, 0, .12);
  --blue: #0066cc;
  --blue-press: #004f9f;
  --ring: #1d1d1f;
  --tile: #ffffff;
  --tile-alt: #fbfbfd;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  letter-spacing: 0;
}

a { color: inherit; }

a, button { touch-action: manipulation; }

a:focus-visible {
  outline: 3px solid var(--ring);
  outline-offset: 4px;
  border-radius: 10px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0 16px;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  text-decoration: none;
  transform: translateY(-76px);
  transition: transform .2s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.nav-wrap {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(245, 245, 247, .82);
  backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid rgba(0, 0, 0, .08);
}

.nav {
  width: min(1040px, calc(100% - 32px));
  height: 48px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: rgba(29, 29, 31, .78);
}

.brand {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-weight: 680;
}

.brand-mark {
  width: 23px;
  height: 23px;
  border-radius: 6px;
  display: grid;
  place-items: center;
  background: #1d1d1f;
  color: #fff;
  font-size: 11px;
  font-weight: 760;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.nav-links a:hover { color: #000; }

main {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  min-height: 560px;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 76px 0 54px;
}

.hero-inner {
  width: 100%;
  max-width: 1120px;
}

.kicker {
  margin: 0 0 14px;
  color: var(--soft);
  font-size: clamp(17px, 2vw, 22px);
  font-weight: 600;
}

h1 {
  margin: 0;
  font-size: clamp(54px, 8.2vw, 112px);
  line-height: .96;
  font-weight: 760;
  letter-spacing: 0;
}

.subtitle {
  margin: 20px auto 0;
  max-width: 720px;
  color: var(--muted);
  font-size: clamp(19px, 2.4vw, 28px);
  line-height: 1.35;
  font-weight: 520;
}

.actions {
  margin-top: 28px;
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 17px;
}

.actions a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border-radius: 999px;
  color: var(--blue);
  text-decoration: none;
  font-weight: 520;
  transition: background .2s ease, color .2s ease, transform .2s ease;
}

.actions a:first-child {
  background: var(--blue);
  color: #fff;
}

.actions a:first-child:hover {
  background: var(--blue-press);
  text-decoration: none;
}

.actions a:hover { text-decoration: underline; }
.actions a:active { transform: scale(.98); }

.stage {
  margin: 0 auto;
  width: 100%;
  height: 82px;
  position: relative;
  display: grid;
  place-items: center;
}

.halo {
  position: absolute;
  width: min(1040px, calc(100vw - 48px));
  height: 72px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 45%, rgba(0, 102, 204, .18), transparent 28%),
    radial-gradient(circle at 64% 50%, rgba(52, 199, 89, .14), transparent 30%),
    radial-gradient(circle at 50% 44%, rgba(255, 149, 0, .10), transparent 28%);
  filter: blur(24px);
  opacity: .92;
}

.device {
  position: relative;
  width: min(1040px, calc(100vw - 48px));
  height: 52px;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255,255,255,.96), rgba(255,255,255,.72));
  box-shadow: 0 18px 48px rgba(0, 0, 0, .08), inset 0 0 0 1px rgba(0,0,0,.08);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 8px;
}

.mini {
  border-radius: 12px;
  background: var(--tile-alt);
  display: grid;
  place-items: center;
  color: var(--muted);
  font-weight: 650;
  font-size: 13px;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.05);
}

.section-title {
  margin: 0 0 22px;
  text-align: center;
  font-size: clamp(34px, 5vw, 62px);
  line-height: 1.04;
  font-weight: 740;
  letter-spacing: 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}

.tile {
  position: relative;
  min-height: 318px;
  border-radius: 8px;
  background: var(--tile);
  overflow: hidden;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  text-align: center;
  padding: 36px 28px 28px;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.04);
  transition: transform .22s ease, box-shadow .22s ease;
}

.tile:hover .more { text-decoration: underline; }
.tile:hover { transform: translateY(-2px); }
.tile:active { transform: scale(.995); }

.tile.dark {
  background: #111114;
  color: #f5f5f7;
}

.tile.keynote-tile {
  grid-column: 1 / -1;
  min-height: 260px;
  flex-direction: row;
  justify-content: space-between;
  text-align: left;
  padding: 42px 56px;
  background:
    radial-gradient(circle at 18% 18%, rgba(212, 165, 116, .22), transparent 30%),
    radial-gradient(circle at 86% 18%, rgba(227, 18, 11, .16), transparent 28%),
    linear-gradient(135deg, #08080a, #17110f 58%, #0b1017);
  color: #f5f5f7;
}

.tile.keynote-tile h3 {
  max-width: 640px;
}

.tile.keynote-tile p {
  max-width: 540px;
  color: rgba(245, 245, 247, .72);
}

.tile h3 {
  margin: 0;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.05;
  font-weight: 740;
  letter-spacing: 0;
}

.tile p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.35;
  font-weight: 520;
}

.tile.dark p { color: rgba(245,245,247,.72); }

.more {
  margin-top: 16px;
  color: var(--blue);
  font-size: 17px;
  font-weight: 520;
}

.tile.dark .more { color: #2997ff; }
.tile.keynote-tile .more { color: #f0c58e; }

.visual {
  width: min(282px, 80%);
  height: 94px;
  margin-top: 0;
  border-radius: 24px;
  background:
    linear-gradient(135deg, rgba(0,102,204,.10), rgba(0,102,204,.02)),
    #f5f5f7;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 12px;
}

.tile.dark .visual {
  background:
    linear-gradient(135deg, rgba(41,151,255,.18), rgba(255,255,255,.06)),
    #1d1d22;
}

.tile.keynote-tile .visual {
  width: min(380px, 40%);
  height: 122px;
  flex: 0 0 auto;
  background:
    linear-gradient(135deg, rgba(212,165,116,.22), rgba(0,102,204,.12)),
    rgba(255,255,255,.07);
}

.visual i {
  border-radius: 15px;
  display: block;
  background: #fff;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.05);
}

.tile.dark .visual i {
  background: rgba(255,255,255,.12);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.06);
}

.shot {
  min-width: 0;
  border-radius: 13px;
  background: #fff;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.05);
  padding: 8px;
  display: grid;
  gap: 6px;
  align-content: start;
}

.tile.dark .shot {
  background: rgba(255,255,255,.10);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.08);
}

.shot-line,
.shot-pill,
.shot-block,
.shot-dot {
  display: block;
  border-radius: 999px;
  background: rgba(0,0,0,.16);
}

.tile.dark .shot-line,
.tile.dark .shot-pill,
.tile.dark .shot-block,
.tile.dark .shot-dot {
  background: rgba(255,255,255,.32);
}

.shot-line { height: 7px; width: 72%; }
.shot-line.short { width: 44%; }
.shot-pill { height: 9px; width: 52%; }
.shot-block { height: 26px; border-radius: 9px; width: 100%; opacity: .82; }

.shot-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 5px;
  margin-top: 2px;
}

.shot-grid span {
  height: 18px;
  border-radius: 8px;
  background: rgba(0,0,0,.12);
}

.tile.dark .shot-grid span {
  background: rgba(255,255,255,.18);
}

.shot-dots {
  display: flex;
  gap: 5px;
  align-items: center;
  margin-top: 1px;
}

.shot-dot {
  width: 7px;
  height: 7px;
}

.shot.accent-blue .shot-pill,
.shot.accent-blue .shot-block,
.shot.accent-blue .shot-dot { background: #2997ff; }

.shot.accent-cyan .shot-pill,
.shot.accent-cyan .shot-block,
.shot.accent-cyan .shot-dot { background: #5ac8fa; }

.shot.accent-green .shot-pill,
.shot.accent-green .shot-block,
.shot.accent-green .shot-dot { background: #34c759; }

.list {
  margin: 16px 0 70px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.row {
  min-height: 238px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 18px;
  padding: 24px;
  border-radius: 8px;
  background: var(--tile);
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.04);
  text-decoration: none;
  transition: background .18s ease;
}

.row:hover { background: rgba(0, 0, 0, .025); }
.row:active { background: rgba(0, 0, 0, .045); }

.row-title {
  display: block;
  font-size: 22px;
  color: var(--ink);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: 0;
}

.row-meta {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 14px;
}

.row-arrow {
  align-self: flex-end;
  color: var(--blue);
  font-size: 22px;
  font-weight: 400;
}

.row-visual {
  width: 100%;
  height: 116px;
  align-self: center;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(0,102,204,.08), rgba(52,199,89,.06)),
    #fbfbfd;
  display: grid;
  place-items: center;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.04);
}

.row-preview {
  width: min(292px, calc(100% - 28px));
  height: 84px;
  border-radius: 25px;
  background:
    linear-gradient(135deg, rgba(0,102,204,.10), rgba(0,102,204,.02)),
    #eef1f7;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 7px;
  padding: 10px;
}

.row.contact {
  min-height: 238px;
}

.row.contact .row-arrow {
  align-self: end;
}

.contact-mark {
  width: 58px;
  height: 58px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  color: var(--blue);
  background: #f5f5f7;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.05);
  font-size: 28px;
  font-weight: 520;
}

.private-tools {
  margin: 0 0 70px;
  border-radius: 8px;
  background: #111114;
  color: #f5f5f7;
  padding: 34px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.08);
}

.private-tools h3 {
  margin: 0;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.08;
  font-weight: 740;
  letter-spacing: 0;
}

.private-tools p {
  margin: 10px 0 0;
  max-width: 560px;
  color: rgba(245,245,247,.72);
  font-size: 17px;
  line-height: 1.45;
}

.private-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.private-actions a,
.private-actions button {
  min-height: 44px;
  border: 0;
  border-radius: 999px;
  padding: 0 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #f5f5f7;
  color: #111114;
  text-decoration: none;
  font: inherit;
  font-size: 15px;
  font-weight: 650;
  cursor: pointer;
}

.private-actions a.secondary {
  background: rgba(255,255,255,.12);
  color: #f5f5f7;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.12);
}

.private-actions a:hover,
.private-actions button:hover {
  text-decoration: underline;
}

.private-actions[hidden] {
  display: none;
}

.private-error {
  min-height: 20px;
  margin-top: 10px;
  color: #ffb4a8;
  font-size: 13px;
}

.fineprint {
  max-width: 880px;
  margin: 0 auto 42px;
  color: var(--muted);
  text-align: center;
  font-size: 13px;
  line-height: 1.7;
}

footer {
  width: min(1040px, calc(100% - 32px));
  margin: 0 auto;
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border-top: 1px solid rgba(0,0,0,.12);
  color: var(--soft);
  font-size: 12px;
}

footer a {
  color: var(--soft);
  text-decoration: none;
}

footer a:hover { text-decoration: underline; }

.corner-link {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 20;
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  border-radius: 999px;
  color: var(--blue);
  background: rgba(255, 255, 255, .86);
  box-shadow: 0 12px 30px rgba(0, 0, 0, .10), inset 0 0 0 1px rgba(0,0,0,.06);
  backdrop-filter: blur(16px);
  text-decoration: none;
  font-size: 14px;
  font-weight: 560;
}

.corner-link:hover { text-decoration: underline; }

@media (max-width: 780px) {
  .nav { height: auto; padding: 14px 0; align-items: flex-start; flex-direction: column; gap: 12px; }
  .nav-links { width: 100%; justify-content: space-between; gap: 12px; }
  .hero { min-height: auto; padding: 54px 0 38px; }
  .stage { height: 66px; }
  .halo { height: 58px; width: min(100%, calc(100vw - 32px)); }
  .device { width: min(100%, calc(100vw - 32px)); height: 46px; border-radius: 16px; gap: 6px; padding: 7px; }
  .mini { border-radius: 10px; font-size: 12px; }
  .grid { grid-template-columns: 1fr; }
  .tile { min-height: 270px; padding: 32px 20px 24px; gap: 22px; }
  .tile.keynote-tile {
    grid-column: auto;
    min-height: 300px;
    flex-direction: column;
    justify-content: center;
    text-align: center;
    padding: 32px 20px 24px;
  }
  .visual { width: min(272px, 82%); height: 86px; gap: 7px; padding: 10px; }
  .tile.keynote-tile .visual { width: min(272px, 82%); height: 86px; }
  .shot { padding: 7px; }
  .shot-block { height: 23px; }
  .list { grid-template-columns: 1fr; gap: 12px; }
  .row { min-height: 226px; padding: 20px; }
  .row-visual { height: 112px; }
  .row-preview { width: min(292px, calc(100% - 24px)); height: 82px; }
  .row.contact { min-height: 160px; }
  .private-tools { grid-template-columns: 1fr; padding: 24px 20px; }
  .private-actions { justify-content: flex-start; }
  footer { display: block; padding: 22px 0; }
  footer div + div { margin-top: 8px; }
  .corner-link { right: 12px; bottom: 12px; min-height: 34px; font-size: 13px; }
}