/* ==========================================================================
   buhui996 Site — 官网首页 & 登录注册
   ========================================================================== */
.site { background: var(--surface); }
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 var(--s-6); }
@media (max-width: 640px) { .container { padding: 0 var(--s-4); } }

/* ---------- Wordmark ---------- */
.brand { display: inline-flex; align-items: center; gap: 8px; flex: none; }
.wordmark { font-size: 18px; font-weight: var(--fw-bold); letter-spacing: -.01em; color: var(--gray-900); }
.wordmark b { color: var(--brand-600); font-weight: var(--fw-bold); }

/* ---------- Header ---------- */
.site-header { position: sticky; top: 0; z-index: var(--z-header); background: var(--surface); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; gap: var(--s-10); height: 64px; }
.site-nav { display: flex; align-items: stretch; align-self: stretch; gap: var(--s-8); flex: 1; }
.nav-link {
  position: relative; display: inline-flex; align-items: center; gap: 4px; height: 100%;
  font-size: var(--fs-base); color: var(--gray-800);
  transition: color var(--dur-fast) var(--ease-out);
}
.nav-link::after { content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; background: var(--brand-600); transform: scaleX(0); transition: transform var(--dur) var(--ease-out); }
.nav-link:hover, .nav-link.is-active { color: var(--brand-600); }
.nav-link:hover::after, .nav-link.is-active::after { transform: scaleX(1); }
.nav-link .icon { width: 14px; height: 14px; transition: transform var(--dur) var(--ease-out); }
.header-actions { display: flex; align-items: center; gap: var(--s-3); }
.header-actions .btn { --btn-h: 34px; }
.nav-toggle { display: none; }

/* 产品下拉 */
.mega { position: relative; display: flex; }
.mega:hover .nav-link .icon, .mega:focus-within .nav-link .icon { transform: rotate(180deg); }
.mega-panel {
  position: absolute; top: 100%; left: -20px; width: 300px; padding: var(--s-2) 0;
  background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow-md);
  opacity: 0; visibility: hidden;
  transition: opacity var(--dur) var(--ease-out), visibility 0s linear var(--dur);
}
.mega:hover .mega-panel, .mega:focus-within .mega-panel { opacity: 1; visibility: visible; transition-delay: 0s; }
.mega-item { display: flex; align-items: center; gap: var(--s-3); padding: 10px var(--s-5); color: var(--gray-800); transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out); }
.mega-item .icon { color: var(--brand-600); }
.mega-item:hover { background: var(--gray-50); color: var(--brand-600); }

@media (max-width: 900px) {
  .header-inner { gap: var(--s-3); }
  .nav-toggle { display: inline-flex; }
  .header-actions { margin-left: auto; }
  .header-actions .btn-text { display: none; }
  .site-nav {
    position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; gap: 0;
    padding: var(--s-2) 0; background: var(--surface); border-bottom: 1px solid var(--border); box-shadow: var(--shadow-md);
    display: none;
  }
  .site-header.is-open .site-nav { display: flex; }
  .nav-link { height: 48px; padding: 0 var(--s-4); justify-content: space-between; }
  .nav-link::after { display: none; }
  .mega { flex-direction: column; }
  .mega-panel { position: static; width: auto; border: 0; box-shadow: none; padding: 0; opacity: 1; visibility: visible; display: none; background: var(--gray-50); }
  .mega:focus-within .mega-panel { display: block; }
}

/* ---------- 首屏：整体介绍 ---------- */
.hero {
  position: relative; overflow: hidden; overflow: clip; display: flex; flex-direction: column;
  min-height: calc(100vh - 64px); min-height: calc(100svh - 64px);
  background: var(--surface);
}
/* 同心圆环 */
.hero::before {
  content: ""; position: absolute; right: -260px; top: -300px; width: 920px; height: 920px; border-radius: 50%;
  border: 1px solid var(--gray-200);
  box-shadow: 0 0 0 90px rgba(0, 0, 0, .014), 0 0 0 180px rgba(0, 0, 0, .01);
  pointer-events: none;
}
/* 点阵 */
.hero::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 46%; height: 60%; pointer-events: none;
  background-image: radial-gradient(rgba(0, 0, 0, .12) 1px, transparent 1.4px); background-size: 22px 22px;
  -webkit-mask-image: linear-gradient(35deg, #000 0%, transparent 70%); mask-image: linear-gradient(35deg, #000 0%, transparent 70%);
}
.hero-main { position: relative; z-index: 1; flex: 1; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: var(--s-12); align-items: center; padding-top: var(--s-12); padding-bottom: var(--s-12); }
.hero h1 { font-size: clamp(44px, 6.2vw, 88px); line-height: 1.14; font-weight: var(--fw-bold); color: var(--gray-900); letter-spacing: -.02em; }
/* “AI” 反白方块 */
.hero h1 .h1-ai {
  display: inline-block; margin-right: .12em; padding: 0 .16em; border-radius: 6px; vertical-align: .04em;
  font-style: normal; font-size: .9em; line-height: 1.12; letter-spacing: 0; background: var(--gray-900); color: #fff;
}
.hero-lead { margin-top: var(--s-8); max-width: 560px; font-size: var(--fs-lg); line-height: 1.8; color: var(--text-2); }
.hero-cta { display: flex; flex-wrap: wrap; gap: var(--s-3); margin-top: var(--s-10); }
.hero-cta .btn { --btn-h: 44px; min-width: 136px; padding: 0 var(--s-6); font-size: var(--fs-md); }

.hero-strip { position: relative; z-index: 1; background: var(--gray-50); border-top: 1px solid var(--border); }
/* 横向无缝滚动：两组相同内容，整体平移 -50%；悬停暂停 */
.marquee { overflow: hidden; -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.marquee-track { display: flex; width: max-content; animation: marquee 36s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee-group { display: flex; flex: none; min-width: 100vw; justify-content: space-around; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
.strip-item { display: flex; align-items: center; gap: var(--s-4); flex: none; padding: var(--s-6) var(--s-12); white-space: nowrap; }
.strip-item .icon { width: 40px; height: 40px; padding: 9px; border-radius: 6px; background: var(--surface); border: 1px solid var(--border); color: var(--gray-900); flex: none; }
.strip-item b { display: block; font-size: var(--fs-lg); font-weight: var(--fw-semibold); color: var(--text); }
@media (prefers-reduced-motion: reduce) {
  .marquee { -webkit-mask-image: none; mask-image: none; }
  .marquee-track { width: auto; animation: none; }
  .marquee-group { flex-wrap: wrap; flex: 1; }
  .marquee-group[aria-hidden] { display: none; }
}

/* ---------- 产品界面展示（只读示意，不可交互） ---------- */
.shot { position: relative; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); box-shadow: 0 24px 48px -24px rgba(0, 0, 0, .18), 0 8px 16px -8px rgba(0, 0, 0, .06); overflow: hidden; pointer-events: none; user-select: none; font-size: var(--fs-sm); color: var(--text); text-align: left; }
.shot-bar { display: flex; align-items: center; gap: 6px; height: 34px; padding: 0 var(--s-4); background: var(--gray-50); border-bottom: 1px solid var(--border); }
.shot-bar i { width: 9px; height: 9px; border-radius: 50%; background: var(--gray-300); }
.shot-bar span { margin-left: var(--s-3); font-family: var(--font-mono); font-size: 11px; color: var(--text-3); }
.shot-body { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); gap: var(--s-4); padding: var(--s-4); background: var(--gray-100); }
.shot .card { overflow: hidden; }
.shot-body .card-header { padding: var(--s-3) var(--s-4); }
.shot-body .card-body { padding: var(--s-4); }
.shot-body .table td, .shot-body .table th { padding: 10px var(--s-3); }
.shot-body .table th:first-child, .shot-body .table td:first-child { padding-left: var(--s-4); }
.shot-body .kv { grid-template-columns: 64px 1fr; }
.shot-body .code { font-size: 11.5px; padding: var(--s-3) var(--s-4); white-space: pre-wrap; word-break: break-all; }

/* 首屏右侧：控制台示意 */
.hero-shot .shot-app { display: grid; grid-template-columns: 148px minmax(0, 1fr); min-height: 360px; }
.mini-side { padding: var(--s-3) 0; background: var(--surface); border-right: 1px solid var(--border); }
.mini-side .mini-brand { display: flex; align-items: center; gap: 6px; padding: 0 var(--s-4) var(--s-3); font-weight: var(--fw-bold); font-size: 13px; white-space: nowrap; }
.mini-side .mini-brand b { color: var(--brand-600); }
.mini-side > span { position: relative; display: flex; align-items: center; gap: var(--s-2); height: 34px; padding: 0 var(--s-4); font-size: 12px; color: var(--gray-700); }
.mini-side > span .icon { width: 14px; height: 14px; color: var(--gray-400); }
.mini-side > span.on { background: var(--brand-50); color: var(--brand-700); }
.mini-side > span.on .icon { color: var(--brand-600); }
.mini-side > span.on::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 2px; background: var(--brand-600); }
.mini-main { padding: var(--s-4); background: var(--gray-100); display: grid; gap: var(--s-3); align-content: start; }
.mini-stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-3); }
.mini-stats .card { padding: var(--s-3); }
.mini-stats em { display: block; font-style: normal; font-size: 11px; color: var(--text-3); }
.mini-stats b { display: block; margin-top: 2px; font-size: var(--fs-xl); font-weight: var(--fw-medium); font-variant-numeric: tabular-nums; }
.mini-row { display: flex; align-items: center; gap: var(--s-3); padding: 10px var(--s-4); font-size: 12px; }
.mini-row + .mini-row { border-top: 1px solid var(--gray-100); }
.mini-row .t { flex: 1; min-width: 0; }
.mini-row .t b { display: block; font-weight: var(--fw-medium); }
.mini-row .t em { display: block; font-style: normal; font-size: 11px; color: var(--text-3); }

@media (max-width: 1024px) {
  .hero-main { grid-template-columns: 1fr; gap: var(--s-10); }
  .hero::before { right: -480px; }
}
@media (max-width: 640px) {
  .hero-lead { font-size: var(--fs-md); }
  .hero-shot { display: none; }
  .strip-item { padding: var(--s-4) var(--s-8); }
  .shot .table th:nth-child(3), .shot .table td:nth-child(3) { display: none; }
}

/* ---------- 业务区：左侧业务均分整屏，右侧切换介绍与展示 ---------- */
.stage { scroll-margin-top: 64px; display: grid; grid-template-columns: minmax(300px, 32%) minmax(0, 1fr); border-bottom: 1px solid var(--border); }
.stage-side {
  position: sticky; top: 64px; align-self: start;
  height: calc(100vh - 64px); height: calc(100svh - 64px);
  display: flex; flex-direction: column; border-right: 1px solid var(--border); background: var(--gray-50);
}
/* 业务区统一黑白，不再按业务区分颜色 */
.stage { --t: var(--gray-900); --t-soft: var(--gray-50); }

.stage-item {
  position: relative; overflow: hidden; flex: 1 1 0; display: flex; flex-direction: column; justify-content: center;
  padding: 0 var(--s-12); text-align: left; color: var(--text-3); background: transparent;
  border-bottom: 1px solid var(--border);
  transition: background-color var(--dur) var(--ease-out), color var(--dur) var(--ease-out);
}
.stage-item::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--t);
  transform: scaleY(0); transition: transform var(--dur-slow) var(--ease-out);
}
.stage-item > * { position: relative; }
.stage-item:last-child { border-bottom: 0; }
.stage-name { font-size: 28px; line-height: 1.3; font-weight: var(--fw-semibold); }
.stage-bg { position: absolute !important; right: -18px; bottom: -26px; width: 150px; height: 150px; stroke-width: 1.1; color: var(--t); opacity: .035; transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out); }
.stage-arrow { position: absolute !important; right: var(--s-10); top: 50%; width: 24px; height: 24px; opacity: 0; transform: translate(-8px, -50%); transition: opacity var(--dur) var(--ease-out), transform var(--dur) var(--ease-out); }
.stage-item:hover { color: var(--text); background: rgba(255, 255, 255, .6); }
.stage-item:hover .stage-bg { opacity: .06; transform: rotate(-6deg); }
.stage-item:hover .stage-arrow { opacity: 1; transform: translate(0, -50%); color: var(--t); }
.stage-item[aria-selected="true"] { color: var(--gray-900); background: var(--surface); }
.stage-item[aria-selected="true"]::before { transform: scaleY(1); }
.stage-item[aria-selected="true"] .stage-bg { opacity: .07; }
.stage-item[aria-selected="true"] .stage-arrow { opacity: 1; transform: translate(0, -50%); color: var(--t); }

.stage-main { min-width: 0; overflow: hidden; overflow: clip; background: var(--surface); }
.stage-panel { position: relative; padding: var(--s-16) var(--s-16) var(--s-20); background: var(--surface); }
.stage-panel::before {
  content: ""; position: absolute; right: -120px; top: -120px; width: 420px; height: 420px; border-radius: 50%; pointer-events: none;
  border: 1px solid var(--gray-200); box-shadow: 0 0 0 60px rgba(0, 0, 0, .012);
}
.stage-panel > * { position: relative; }
.stage-panel:not([hidden]) { animation: panel-in var(--dur-slow) var(--ease-out); }
@keyframes panel-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.sp-head h2 { font-size: 40px; line-height: 1.25; font-weight: var(--fw-bold); color: var(--gray-900); }
.sp-head p { margin-top: var(--s-4); max-width: 640px; font-size: var(--fs-lg); line-height: 1.8; color: var(--text-2); }
.sp-cta { display: flex; flex-wrap: wrap; gap: var(--s-3); margin-top: var(--s-8); }
.sp-cta .btn { --btn-h: 40px; min-width: 120px; }

.sp-show {
  position: relative; overflow: hidden; overflow: clip; margin-top: var(--s-12); padding: var(--s-10);
  background: var(--gray-50); border: 1px solid var(--border); border-radius: 8px;
}
.sp-show::before {
  content: ""; position: absolute; left: -80px; bottom: -160px; width: 360px; height: 360px; border-radius: 50%;
  border: 1px solid var(--gray-200); box-shadow: 0 0 0 50px rgba(0, 0, 0, .015);
}
.sp-show .shot { position: relative; }
.sp-pricing { margin-top: var(--s-12); }
.price-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: var(--s-4); }
.price-card { display: flex; flex-direction: column; padding: var(--s-6); background: var(--surface); border: 1px solid var(--border); border-radius: 6px; transition: border-color var(--dur) var(--ease-out); }
.price-card:hover { border-color: var(--gray-900); }
.price-card h4 { font-size: var(--fs-md); font-weight: var(--fw-medium); color: var(--text-2); }
.price-card .price { margin: var(--s-4) 0 var(--s-6); white-space: nowrap; font-size: 34px; line-height: 1; font-weight: var(--fw-bold); color: var(--gray-900); font-variant-numeric: tabular-nums; }
.price-card .price small { margin-left: 4px; font-size: var(--fs-sm); font-weight: var(--fw-regular); color: var(--text-3); }
.price-card .btn { margin-top: auto; }

.sp-block { margin-top: var(--s-16); }
.sp-block h3 { font-size: var(--fs-2xl); font-weight: var(--fw-semibold); color: var(--gray-900); margin-bottom: var(--s-6); }
.sp-features { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-4); }
.sp-feature { display: flex; align-items: center; gap: var(--s-4); padding: var(--s-6); background: var(--surface); border: 1px solid var(--border); border-radius: 6px; transition: border-color var(--dur) var(--ease-out); }
.sp-feature:hover { border-color: var(--t); }
.sp-feature .icon { width: 48px; height: 48px; padding: 12px; border-radius: 6px; background: var(--t-soft); border: 1px solid var(--border); color: var(--t); flex: none; stroke-width: 1.7; }
.sp-feature b { display: block; font-size: var(--fs-lg); font-weight: var(--fw-semibold); color: var(--gray-900); }

.sp-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.sp-step { position: relative; padding: var(--s-5) var(--s-6) 0 0; border-top: 2px solid var(--gray-200); }
.sp-step:first-child { border-top-color: var(--t); }
.sp-step b { display: block; font-size: var(--fs-lg); font-weight: var(--fw-semibold); color: var(--gray-900); }
.sp-step + .sp-step { margin-left: var(--s-4); }

.sp-soon { margin-top: var(--s-12); display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 320px; text-align: center; border-radius: 8px; color: var(--text-3); background: var(--gray-50); border: 1px dashed var(--border-strong); }
.sp-soon .icon { width: 56px; height: 56px; color: var(--gray-400); margin-bottom: var(--s-4); stroke-width: 1.4; }
.sp-soon b { font-size: var(--fs-2xl); color: var(--text); font-weight: var(--fw-semibold); }

@media (max-width: 1200px) { .stage-panel { padding: var(--s-12) var(--s-10) var(--s-16); } .stage-item { padding: 0 var(--s-8); } }
@media (max-width: 960px) {
  .stage { grid-template-columns: 1fr; }
  .stage-side { position: static; height: auto; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-right: 0; border-bottom: 1px solid var(--border); }
  .stage-item { min-height: 112px; padding: var(--s-5); border-bottom: 1px solid var(--border); }
  .stage-item:nth-child(odd) { border-right: 1px solid var(--border); }
  .stage-item:nth-child(n+3) { border-bottom: 0; }
  .stage-name { font-size: var(--fs-xl); }
  .stage-arrow { display: none; }
  .stage-bg { width: 96px; height: 96px; right: -12px; bottom: -18px; }
  .stage-panel { padding: var(--s-10) var(--s-4) var(--s-12); }
  .sp-head h2 { font-size: 30px; }
  .sp-show { padding: var(--s-4); }
  .shot-body { grid-template-columns: 1fr; }
  .sp-features { grid-template-columns: 1fr; }
  .price-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .price-card { padding: var(--s-4); }
  .price-card .price { font-size: 28px; }
  .sp-steps { grid-template-columns: 1fr; gap: var(--s-6); }
  .sp-step + .sp-step { margin-left: 0; }
}

/* ---------- Footer ---------- */
.site-footer { background: var(--surface); color: var(--text-2); font-size: var(--fs-sm); }
.footer-main { display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: var(--s-8); padding: var(--s-12) 0 var(--s-10); }
.footer-brand p { margin-top: var(--s-3); color: var(--text-3); }
.footer-col h5 { font-size: var(--fs-base); font-weight: var(--fw-medium); color: var(--text); margin-bottom: var(--s-4); }
.footer-col ul { display: grid; gap: var(--s-3); }
.footer-col a { transition: color var(--dur-fast) var(--ease-out); }
.footer-col a:hover { color: var(--text); }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--s-3); padding: var(--s-5) 0; border-top: 1px solid var(--border); color: var(--text-3); }
.footer-bottom nav { display: flex; gap: var(--s-5); }
.footer-bottom a:hover { color: var(--text); }
@media (max-width: 768px) { .footer-main { grid-template-columns: repeat(2, 1fr); } .footer-brand { grid-column: 1 / -1; } }

/* ==========================================================================
   Auth 登录 / 注册
   ========================================================================== */
.auth-page { min-height: 100vh; display: flex; flex-direction: column; background: var(--gray-100); }
.auth-header { height: 64px; background: var(--surface); border-bottom: 1px solid var(--border); }
.auth-header .container { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.auth-body { flex: 1; display: flex; align-items: center; justify-content: center; padding: var(--s-12) var(--s-4); }
.auth-card { width: 100%; max-width: 420px; background: var(--surface); border: 1px solid var(--border); padding: var(--s-8) var(--s-10) var(--s-10); }
.auth-card .tabs { margin-bottom: var(--s-6); gap: var(--s-8); }
.auth-card .tab { font-size: var(--fs-lg); padding: var(--s-3) 0 var(--s-4); }
.auth-card .input { height: 40px; }
.auth-row { display: flex; align-items: center; justify-content: space-between; margin: var(--s-4) 0 var(--s-6); }
.auth-card .btn-block { --btn-h: 40px; }
.captcha-slot { display: flex; align-items: center; justify-content: center; height: 40px; border: 1px dashed var(--border-strong); background: var(--gray-50); font-size: var(--fs-sm); color: var(--text-3); }
.auth-footer { padding: var(--s-5) 0; text-align: center; font-size: var(--fs-xs); color: var(--text-3); }
@media (max-width: 480px) { .auth-card { padding: var(--s-6) var(--s-5); } }