/* ==========================================================================
   云启 Yunqi — AI 交易机器人 落地页
   ========================================================================== */

:root {
  --bg: #f6f8fb;
  --bg-elev: #ffffff;
  --bg-alt: #eef2f8;
  --fg: #0d1424;
  --fg-soft: #47536b;
  --fg-faint: #7b879e;
  --line: #e2e8f2;
  --line-strong: #cdd6e6;
  --brand: #12b886;
  --brand-2: #3b82f6;
  --brand-ink: #06392b;
  --danger: #d64545;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(13,20,36,.05), 0 8px 30px rgba(13,20,36,.06);
  --shadow-lg: 0 20px 60px rgba(13,20,36,.12);
  --maxw: 1160px;
  --ease: cubic-bezier(.2,.7,.2,1);
}

html[data-theme="dark"] {
  --bg: #070b14;
  --bg-elev: #0e1626;
  --bg-alt: #0b1220;
  --fg: #eaf0fb;
  --fg-soft: #a7b3c9;
  --fg-faint: #6b7893;
  --line: #1b2740;
  --line-strong: #26344f;
  --brand: #22d3a7;
  --brand-2: #60a5fa;
  --brand-ink: #04231b;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 12px 40px rgba(0,0,0,.35);
  --shadow-lg: 0 24px 70px rgba(0,0,0,.5);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 { line-height: 1.2; font-weight: 700; margin: 0 0 .5em; letter-spacing: -.01em; }
p { margin: 0 0 1em; color: var(--fg-soft); }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* Background decoration --------------------------------------------------- */
.bg-grid, .bg-glow { position: fixed; inset: 0; pointer-events: none; z-index: 0; }
.bg-grid {
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 60% at 60% -10%, #000 20%, transparent 75%);
  opacity: .5;
}
.bg-glow {
  background:
    radial-gradient(600px 400px at 78% -5%, rgba(34,211,167,.20), transparent 70%),
    radial-gradient(700px 500px at 12% 8%, rgba(59,130,246,.14), transparent 70%);
}

main, .topbar, .footer { position: relative; z-index: 1; }

/* Layout ------------------------------------------------------------------ */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 24px; }
.wrap--narrow { max-width: 780px; }

/* Buttons ----------------------------------------------------------------- */
.btn {
  --btn-bg: transparent; --btn-fg: var(--fg);
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 16px; border-radius: 999px; border: 1px solid transparent;
  font-size: 14px; font-weight: 600; cursor: pointer;
  background: var(--btn-bg); color: var(--btn-fg);
  transition: transform .18s var(--ease), background .18s, border-color .18s, box-shadow .18s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn--primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff; box-shadow: 0 6px 20px rgba(18,184,134,.28);
}
.btn--primary:hover { box-shadow: 0 10px 30px rgba(18,184,134,.4); }
.btn--outline { border-color: var(--line-strong); color: var(--fg); background: var(--bg-elev); }
.btn--outline:hover { border-color: var(--brand); color: var(--brand); }
.btn--ghost { color: var(--fg-soft); }
.btn--ghost:hover { color: var(--fg); background: var(--bg-alt); }
.btn--lg { padding: 13px 24px; font-size: 15px; }
.btn--block { width: 100%; }

/* Topbar ------------------------------------------------------------------ */
.topbar {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(180%) blur(12px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color .2s, background .2s;
}
.topbar.is-stuck { border-bottom-color: var(--line); }
.topbar__inner { display: flex; align-items: center; gap: 18px; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 9px; font-weight: 800; }
.brand__name { font-size: 17px; letter-spacing: -.02em; }
.brand__name em { font-style: normal; font-weight: 600; color: var(--fg-faint); font-size: 13px; }
.nav { display: flex; gap: 4px; margin-inline: auto; }
.nav a {
  padding: 7px 12px; border-radius: 8px; font-size: 14px; font-weight: 600; color: var(--fg-soft);
  transition: color .15s, background .15s;
}
.nav a:hover { color: var(--fg); background: var(--bg-alt); }
.topbar__actions { display: flex; align-items: center; gap: 6px; }

/* 语言菜单 --------------------------------------------------------------- */
.lang { position: relative; }
.lang__menu[hidden] { display: none; }
.lang__menu {
  position: absolute; top: calc(100% + 8px); right: 0; z-index: 60;
  display: grid; grid-template-columns: 1fr 1fr; gap: 2px;
  min-width: 300px; max-width: min(92vw, 420px);
  max-height: min(70vh, 420px); overflow-y: auto;
  margin: 0; padding: 6px; list-style: none;
  background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: var(--radius-sm); box-shadow: var(--shadow-lg);
}
.lang__menu li { margin: 0; padding: 0; list-style: none; }
.lang__item {
  display: block; width: 100%; text-align: left;
  border: 0; background: transparent; color: var(--fg-soft);
  padding: 8px 12px; border-radius: 8px; font-size: 14px; font-weight: 500;
  cursor: pointer; transition: color .15s, background .15s;
  white-space: nowrap;
}
.lang__item:hover { color: var(--fg); background: var(--bg-alt); }
.lang__menu li.is-active .lang__item { color: var(--fg); background: var(--bg-alt); font-weight: 700; }
.navToggle { display: none; padding: 8px; }
.mobileNav {
  display: none; flex-direction: column; padding: 8px 24px 18px;
  border-top: 1px solid var(--line); background: var(--bg-elev);
}
.mobileNav a { padding: 12px 4px; font-weight: 600; border-bottom: 1px solid var(--line); }

/* Hero -------------------------------------------------------------------- */
.hero { padding: 72px 0 40px; }
.hero__inner { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px; border-radius: 999px; font-size: 13px; font-weight: 600;
  background: var(--bg-elev); border: 1px solid var(--line); color: var(--fg-soft);
  margin-bottom: 20px;
}
.pill .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--brand); box-shadow: 0 0 0 4px color-mix(in srgb, var(--brand) 22%, transparent); }
.hero h1 { font-size: clamp(30px, 4.6vw, 52px); margin-bottom: 18px; }
.lede { font-size: clamp(15px, 1.6vw, 17px); max-width: 34em; }
.hero__cta { display: flex; gap: 12px; flex-wrap: wrap; margin: 28px 0 14px; }
.hero__note { font-size: 13px; color: var(--fg-faint); margin: 0; }

.hero__panel { display: flex; justify-content: center; }
.panel {
  width: 100%; max-width: 420px; background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow-lg); padding: 20px;
}
.panel__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.panel__title { font-weight: 700; font-size: 14px; }
.tag { font-size: 12px; font-weight: 700; padding: 3px 9px; border-radius: 999px; }
.tag--live { color: var(--brand); background: color-mix(in srgb, var(--brand) 14%, transparent); }
.sparkline { margin: 4px -4px 12px; }
.panel__stats { display: grid; grid-template-columns: repeat(3,1fr); gap: 8px; margin-bottom: 16px; }
.panel__stats > div { background: var(--bg-alt); border-radius: var(--radius-sm); padding: 10px 12px; }
.panel__stats .k { display: block; font-size: 12px; color: var(--fg-faint); }
.panel__stats strong { font-size: 18px; font-variant-numeric: tabular-nums; }
.loglist { list-style: none; margin: 0; padding: 0; font-size: 13px; }
.loglist li { display: flex; gap: 10px; padding: 7px 0; border-top: 1px solid var(--line); color: var(--fg-soft); }
.loglist time { color: var(--fg-faint); font-variant-numeric: tabular-nums; flex: none; }

/* Strip ------------------------------------------------------------------- */
.strip { padding: 14px 0 8px; }
.strip__inner { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; color: var(--fg-faint); font-size: 13px; }
.strip__logos { display: flex; gap: 22px; flex-wrap: wrap; }
.strip__logos span { font-weight: 700; color: var(--fg-soft); opacity: .8; letter-spacing: .02em; }

/* Sections ---------------------------------------------------------------- */
.section { padding: 72px 0; }
.section--alt { background: var(--bg-alt); border-block: 1px solid var(--line); }
.section__head { max-width: 44em; margin-bottom: 40px; }
.section__head h2 { font-size: clamp(24px, 3vw, 34px); }
.section__head p { font-size: 16px; }

.grid { display: grid; gap: 20px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow);
  transition: transform .22s var(--ease), border-color .22s, box-shadow .22s;
}
.card:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--brand) 45%, var(--line)); box-shadow: var(--shadow-lg); }
.card__icon {
  width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center;
  color: var(--brand); background: color-mix(in srgb, var(--brand) 12%, transparent);
  margin-bottom: 16px;
}
.card h3 { font-size: 17px; }
.card p { margin: 0; font-size: 14.5px; }

/* Steps ------------------------------------------------------------------- */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; counter-reset: s; }
.step { position: relative; background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 24px; box-shadow: var(--shadow); }
.step__no { display: inline-block; font-size: 13px; font-weight: 800; color: var(--brand); letter-spacing: .1em; margin-bottom: 12px; }
.step h3 { font-size: 17px; }
.step p { margin: 0; font-size: 14.5px; }

/* Risk -------------------------------------------------------------------- */
.risk { display: grid; grid-template-columns: 1.4fr .9fr; gap: 40px; align-items: start; }
.risk h2 { font-size: clamp(22px, 2.6vw, 30px); }
.checklist { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 12px; }
.checklist li { position: relative; padding-left: 30px; color: var(--fg-soft); font-size: 15px; }
.checklist li::before {
  content: ""; position: absolute; left: 0; top: 3px; width: 18px; height: 18px; border-radius: 50%;
  background: color-mix(in srgb, var(--brand) 16%, transparent);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2312b886' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12l4 4 10-10'/%3E%3C/svg%3E");
  background-size: 12px; background-position: center; background-repeat: no-repeat;
}
.notice {
  background: linear-gradient(180deg, color-mix(in srgb, var(--danger) 8%, var(--bg-elev)), var(--bg-elev));
  border: 1px solid color-mix(in srgb, var(--danger) 35%, var(--line));
  border-radius: var(--radius); padding: 22px 24px;
}
.notice h3 { font-size: 15px; color: var(--danger); }
.notice p { margin: 0; font-size: 14px; }

/* Pricing ----------------------------------------------------------------- */
.pricing { align-items: stretch; }
.plan {
  position: relative; background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 24px; display: flex; flex-direction: column; box-shadow: var(--shadow);
}
.plan--featured { border-color: var(--brand); box-shadow: var(--shadow-lg); }
.plan__badge {
  position: absolute; top: -12px; left: 24px; font-size: 12px; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-2)); padding: 4px 12px; border-radius: 999px;
}
.plan__price { display: flex; align-items: baseline; gap: 6px; margin: 6px 0 18px; }
.plan__price strong { font-size: 34px; letter-spacing: -.02em; }
.plan__price span { color: var(--fg-faint); font-size: 14px; }
.plan ul { list-style: none; margin: 0 0 24px; padding: 0; display: grid; gap: 10px; flex: 1; }
.plan li { position: relative; padding-left: 24px; font-size: 14.5px; color: var(--fg-soft); }
.plan li::before { content: "✓"; position: absolute; left: 0; color: var(--brand); font-weight: 800; }

/* FAQ --------------------------------------------------------------------- */
.faq { display: grid; gap: 10px; }
.faq details {
  background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 4px 18px; box-shadow: var(--shadow);
}
.faq summary {
  cursor: pointer; font-weight: 600; padding: 14px 0; list-style: none;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 20px; color: var(--fg-faint); transition: transform .2s var(--ease); }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq p { margin: 0 0 16px; font-size: 14.5px; }

/* CTA --------------------------------------------------------------------- */
.cta { padding: 84px 0; }
.cta__inner { text-align: center; }
.cta h2 { font-size: clamp(24px, 3.4vw, 38px); }
.cta p { font-size: 16px; }
.signup {
  display: flex; gap: 10px; max-width: 480px; margin: 24px auto 8px; flex-wrap: wrap;
  justify-content: center;
}
.signup input {
  flex: 1 1 240px; min-width: 0; padding: 13px 16px; border-radius: 999px;
  border: 1px solid var(--line-strong); background: var(--bg-elev); color: var(--fg);
  font-size: 15px; font-family: inherit;
}
.signup input:focus { outline: 2px solid var(--brand); outline-offset: 1px; border-color: var(--brand); }
.signup__msg { font-size: 13.5px; color: var(--fg-faint); min-height: 1.4em; margin: 0; }
.signup__msg.is-ok { color: var(--brand); }
.signup__msg.is-err { color: var(--danger); }

/* Footer ------------------------------------------------------------------ */
.footer { border-top: 1px solid var(--line); background: var(--bg-alt); padding: 48px 0 24px; }
.footer__inner { display: grid; grid-template-columns: 1.4fr 2fr; gap: 40px; }
.footer__brand p { font-size: 14px; margin: 12px 0 0; }
.footer__cols { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.footer__cols h4 { font-size: 13px; text-transform: uppercase; letter-spacing: .08em; color: var(--fg-faint); margin-bottom: 12px; }
.footer__cols a { display: block; padding: 5px 0; font-size: 14px; color: var(--fg-soft); }
.footer__cols a:hover { color: var(--brand); }
.footer__bottom { margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--line); }
.footer__bottom p { margin: 0; font-size: 13px; color: var(--fg-faint); }

/* Responsive -------------------------------------------------------------- */
@media (max-width: 960px) {
  .nav { display: none; }
  .navToggle { display: inline-flex; }
  .mobileNav.is-open { display: flex; }
  .hide-sm { display: none; }
  .hero__inner { grid-template-columns: 1fr; gap: 36px; }
  .hero__panel { order: -1; }
  .grid--3, .steps { grid-template-columns: 1fr 1fr; }
  .risk { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .hero { padding: 48px 0 24px; }
  .section { padding: 52px 0; }
  .grid--3, .steps, .footer__cols { grid-template-columns: 1fr; }
  .panel__stats strong { font-size: 16px; }
  .signup button { flex: 1 1 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}