:root {
  --bg: #000000;
  --panel: #1d1d1f;
  --raised: #2a2a2c;
  --line: rgba(255, 255, 255, 0.1);
  --ink: #f5f5f7;
  --muted: #a1a1a6;
  --soft: #86868b;
  --accent: #f5f5f7;
  --accent-soft: rgba(255, 255, 255, 0.08);
  --ok: #30d158;
  --wait: #ffd60a;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Sora", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.shell { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }

.nav {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(18px);
  background: rgba(0, 0, 0, 0.72);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease;
}
.nav.on { border-bottom-color: var(--line); }
.nav-inner {
  height: 64px;
  display: flex; align-items: center; gap: 18px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 650; letter-spacing: -0.03em; font-size: 16px;
}
.logo img { width: 28px; height: 28px; border-radius: 8px; object-fit: cover; }
.nav-links {
  display: flex; gap: 20px; margin-left: 12px;
  color: var(--muted); font-size: 14px;
}
.nav-links a:hover { color: var(--ink); }
.nav-spacer { flex: 1; }
.nav-toggle {
  display: none;
  width: 40px; height: 40px; border-radius: 10px;
  border: 1px solid var(--line); background: transparent; color: var(--ink);
  align-items: center; justify-content: center; cursor: pointer; padding: 0;
}
.nav-toggle span {
  display: block; width: 16px; height: 1.5px; background: currentColor; position: relative;
}
.nav-toggle span::before,
.nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 16px; height: 1.5px; background: currentColor;
}
.nav-toggle span::before { top: -5px; }
.nav-toggle span::after { top: 5px; }
.nav-drawer {
  display: none;
  border-top: 1px solid var(--line);
  background: rgba(0,0,0,.94);
  padding: 12px 20px 18px;
}
.nav-drawer a {
  display: block; padding: 12px 0;
  border-bottom: 1px solid var(--line); color: var(--muted); font-size: 15px;
}
.nav-drawer a:last-child { border-bottom: 0; color: var(--ink); font-weight: 600; }
.nav.open .nav-drawer { display: block; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 42px; padding: 0 18px; border-radius: 12px;
  border: 1px solid var(--line); background: transparent; color: var(--ink);
  font-size: 14px; font-weight: 580; cursor: pointer;
  transition: background .18s ease, border-color .18s ease, transform .18s ease;
}
.btn:hover { background: rgba(255,255,255,.04); border-color: rgba(255,255,255,.16); }
.btn.primary {
  background: var(--ink); color: #000; border-color: var(--ink);
}
.btn.primary:hover { opacity: .93; transform: translateY(-1px); }
.btn.ghost { color: var(--muted); border-color: transparent; }
.btn.ghost:hover { color: var(--ink); background: transparent; }

.hero {
  padding: 40px 0 24px;
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 36px;
  align-items: center;
  animation: rise .55s ease both;
}
.brand-lockup {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 18px;
}
.brand-lockup img {
  width: 40px; height: 40px; border-radius: 11px; object-fit: cover;
}
.brand-lockup .name {
  font-size: 22px;
  font-weight: 680;
  letter-spacing: -0.035em;
  line-height: 1;
}
.brand-lockup .sub {
  margin-top: 5px;
  color: var(--soft);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.hero-copy { max-width: 520px; }
h1 {
  margin: 0;
  font-size: clamp(36px, 4.6vw, 56px);
  line-height: 1.04;
  letter-spacing: -0.045em;
  font-weight: 680;
}
.hero p {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 16px;
  max-width: 30em;
  line-height: 1.55;
}
.cta-row { display: flex; gap: 10px; margin-top: 24px; flex-wrap: wrap; }
.meta-row {
  display: flex; gap: 20px; flex-wrap: wrap;
  margin-top: 20px; color: var(--soft); font-size: 13px;
}
.meta-row span { position: relative; }
.meta-row span + span::before {
  content: "";
  position: absolute; left: -12px; top: 50%;
  width: 3px; height: 3px; border-radius: 50%;
  background: var(--soft); transform: translateY(-50%);
}

.product {
  position: relative;
  border: 1px solid var(--line);
  background: #1d1d1f;
  border-radius: 24px;
  overflow: hidden;
  min-height: 520px;
  display: grid;
  grid-template-columns: 230px 1fr;
  box-shadow: 0 40px 100px rgba(0,0,0,.45);
  animation: rise .65s ease .05s both;
}
.side {
  border-right: 1px solid var(--line);
  background: rgba(255,255,255,.015);
  padding: 14px 10px;
}
.side .cap {
  color: var(--soft); font-size: 11px; letter-spacing: .1em;
  padding: 8px 8px 8px; text-transform: uppercase;
}
.row {
  display: grid; grid-template-columns: 34px 1fr; gap: 8px;
  align-items: center; padding: 8px; border-radius: 12px;
}
.row.on { background: rgba(255,255,255,.055); }
.row b { display: block; font-size: 13px; font-weight: 600; }
.row em {
  display: block; font-style: normal; color: var(--soft);
  font-size: 11.5px; margin-top: 1px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.av {
  width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center; font-size: 13px; font-weight: 650;
  background: #27272f; color: #fff; position: relative;
}
.av i {
  position: absolute; right: -1px; bottom: -1px;
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--ok); border: 2px solid #141418;
}
.av.wait i { background: var(--wait); }
.chat { display: flex; flex-direction: column; min-width: 0; }
.chat-head {
  height: 54px; display: flex; align-items: center; gap: 10px;
  padding: 0 16px; border-bottom: 1px solid var(--line);
}
.chat-head b { font-size: 14px; }
.chat-head span { color: var(--soft); font-size: 12px; }
.pill {
  margin-left: auto; font-size: 11px; color: var(--wait);
  background: rgba(251, 191, 36, 0.08);
  border: 1px solid rgba(251, 191, 36, 0.22);
  border-radius: 8px; padding: 4px 8px;
}
.thread { padding: 16px 16px 14px; overflow: auto; flex: 1; }
.day {
  width: fit-content; margin: 0 auto 14px;
  color: var(--soft); font-size: 11px;
  background: rgba(255,255,255,.03); border: 1px solid var(--line);
  border-radius: 8px; padding: 3px 8px;
}
.msg { display: grid; grid-template-columns: 28px 1fr; gap: 8px; margin: 0 0 12px; }
.msg .av { width: 28px; height: 28px; font-size: 11px; }
.msg .who { font-size: 12px; color: var(--soft); margin-bottom: 2px; }
.msg .who b { color: var(--ink); margin-right: 6px; }
.msg p { margin: 0; font-size: 13px; color: #e4e4e9; line-height: 1.5; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 6px; }
.chip {
  font-size: 11px; color: var(--muted);
  border: 1px solid var(--line); border-radius: 8px; padding: 2px 7px;
}
.card {
  margin: 4px 0 8px 36px;
  background: var(--raised);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 14px;
  padding: 14px;
  box-shadow: 0 12px 40px rgba(0,0,0,.25);
}
.card .k { color: var(--wait); font-size: 11px; font-weight: 650; letter-spacing: .02em; }
.card h3 { margin: 4px 0 6px; font-size: 15px; letter-spacing: -0.02em; }
.card p { margin: 0; color: var(--muted); font-size: 12.5px; }
.card .actions { display: flex; gap: 8px; margin-top: 12px; }
.card .actions span {
  height: 32px; padding: 0 12px; border-radius: 10px;
  display: inline-flex; align-items: center; font-size: 12px; font-weight: 600;
}
.card .yes { background: var(--ink); color: #000; }
.card .no { border: 1px solid var(--line); color: var(--muted); }
.files { display: grid; gap: 8px; margin: 8px 0 0 36px; }
.file {
  display: grid; grid-template-columns: 36px 1fr; gap: 10px; align-items: center;
  background: rgba(255,255,255,.03); border: 1px solid var(--line);
  border-radius: 12px; padding: 8px 10px;
}
.file .ic {
  width: 36px; height: 36px; border-radius: 9px;
  display: grid; place-items: center; font-weight: 700; font-size: 12px; color: #fff;
}
.file .ic.ppt { background: #c2410c; }
.file .ic.xls { background: #15803d; }
.file b { display: block; font-size: 12.5px; }
.file small { color: var(--soft); font-size: 11px; }

.section { padding: 96px 0 8px; }
.section h2 {
  margin: 0 0 12px;
  font-size: clamp(30px, 3.8vw, 44px);
  letter-spacing: -0.04em;
  font-weight: 670;
  max-width: 16em;
}
.section .lead {
  margin: 0 0 36px;
  color: var(--muted);
  max-width: 38em;
  font-size: 16px;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}
.feature {
  padding: 28px 24px 8px 0;
  border-right: 1px solid var(--line);
}
.feature:last-child { border-right: 0; padding-right: 0; }
.feature .tag {
  color: var(--soft); font-size: 12px; font-weight: 600;
  letter-spacing: .06em; margin-bottom: 14px; text-transform: uppercase;
}
.feature h3 {
  margin: 0 0 10px; font-size: 20px;
  letter-spacing: -0.03em; font-weight: 650;
}
.feature p { margin: 0; color: var(--muted); font-size: 14.5px; max-width: 28em; }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  counter-reset: step;
}
.step { padding-top: 4px; }
.step .n {
  color: var(--soft);
  font-size: 13px; font-weight: 600;
  letter-spacing: .08em;
  margin-bottom: 14px;
}
.step h3 { margin: 0 0 8px; font-size: 20px; letter-spacing: -0.03em; }
.step p { margin: 0; color: var(--muted); font-size: 14.5px; }

.audience {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px;
  padding-top: 8px;
}
.audience article h3 {
  margin: 0 0 8px; font-size: 22px; letter-spacing: -0.03em;
}
.audience .tag {
  display: block; color: var(--soft);
  font-size: 12px; font-weight: 600; letter-spacing: .06em;
  text-transform: uppercase; margin-bottom: 12px;
}
.audience p { margin: 0; color: var(--muted); font-size: 15px; max-width: 32em; }

.pricing {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px;
}
.price {
  border: 1px solid var(--line); border-radius: 18px; padding: 24px;
  background: rgba(255,255,255,.02);
  display: flex; flex-direction: column; gap: 8px;
}
.price.featured {
  border-color: rgba(255,255,255,.28);
  background: #1d1d1f;
}
.price h3 { margin: 0; font-size: 18px; }
.price .fee {
  font-size: 36px; font-weight: 670; letter-spacing: -0.045em; margin: 8px 0 2px;
}
.price .fee small { font-size: 14px; color: var(--muted); font-weight: 500; }
.price p { margin: 0; color: var(--muted); font-size: 13.5px; }
.price ul {
  margin: 10px 0 0; padding-left: 18px;
  color: var(--muted); font-size: 13.5px;
  flex: 1;
}
.price .btn { margin-top: 16px; width: 100%; }

.footer {
  margin-top: 88px; border-top: 1px solid var(--line);
  padding: 28px 0 52px;
  display: flex; justify-content: space-between; gap: 16px;
  color: var(--soft); font-size: 13px;
}

.vi-frame {
  display: block; width: 100%;
  border-radius: 18px; border: 1px solid var(--line);
  background: var(--panel);
}
.vi-grid {
  display: grid; grid-template-columns: 0.7fr 1.3fr; gap: 14px;
}
.vi-grid figure { margin: 0; }
.vi-grid img {
  display: block; width: 100%;
  border-radius: 18px; border: 1px solid var(--line);
  background: var(--panel);
}
.vi-grid figcaption {
  margin-top: 10px; color: var(--soft); font-size: 13px;
}

.swatches { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.swatch {
  height: 132px; border-radius: 16px; border: 1px solid var(--line);
  padding: 14px; display: flex; align-items: end; font-size: 13px;
}
.type-sample {
  border: 1px solid var(--line); border-radius: 18px; padding: 28px;
  background: rgba(255,255,255,.02);
}
.type-sample .big {
  font-size: 44px; letter-spacing: -0.045em; font-weight: 670; line-height: 1.08;
}
.type-sample .small { margin-top: 12px; color: var(--muted); }
.mark-stage {
  display: grid; place-items: center; min-height: 240px;
  border: 1px solid var(--line); border-radius: 18px;
}
.wordmark {
  display: flex; align-items: center; gap: 14px;
}
.wordmark .cn {
  font-size: 30px; font-weight: 670; letter-spacing: -0.035em;
}
.wordmark .en {
  color: var(--soft); letter-spacing: 0.16em; font-size: 12px; margin-top: 4px;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { opacity: .55; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.05); }
}

@media (max-width: 960px) {
  .shell { width: min(1180px, calc(100% - 28px)); }
  .hero, .product, .features, .steps, .audience, .pricing, .swatches, .vi-grid { grid-template-columns: 1fr; }
  .product { min-height: auto; border-radius: 18px; }
  .side { display: none; }
  .nav-links, .nav-inner .btn.ghost { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav-inner { gap: 10px; height: 58px; }
  .nav-inner .btn.primary { height: 36px; padding: 0 12px; font-size: 13px; }
  .feature { border-right: 0; border-bottom: 1px solid var(--line); padding: 22px 0; }
  .feature:last-child { border-bottom: 0; }
  .hero { padding: 24px 0 16px; gap: 22px; align-items: start; }
  .hero-copy { max-width: none; }
  .brand-lockup { margin-bottom: 14px; }
  .brand-lockup .name { font-size: 18px; }
  h1 { font-size: clamp(32px, 9vw, 44px); }
  .hero p { font-size: 15px; }
  .cta-row .btn { flex: 1 1 auto; min-height: 44px; }
  .meta-row { gap: 10px 16px; font-size: 12px; }
  .meta-row span + span::before { display: none; }
  .section { padding: 64px 0 4px; }
  .section h2 { font-size: clamp(26px, 7vw, 36px); }
  .thread { padding: 14px 12px; }
  .card, .files { margin-left: 0; }
  .chat-head { height: auto; min-height: 52px; padding: 10px 12px; }
  .price .fee { font-size: 30px; }
  .footer { flex-direction: column; gap: 10px; padding: 24px 0 40px; }
  .type-sample .big { font-size: 28px; }
}

@media (max-width: 560px) {
  .shell { width: calc(100% - 24px); }
  .cta-row { flex-direction: column; }
  .cta-row .btn { width: 100%; }
  .pricing { gap: 10px; }
  .product { border-radius: 14px; }
  .msg p { font-size: 12.5px; }
}