/* ============================================================
   Vela · v4 视觉系统 —— 仿 Moonshot AI / Kimi 官网模版
   实测参数来源（2026-09 抓取）：
   · 暗色沉浸 hero：#121212 底 + 全屏动态背景 + 渐变压暗层
   · 毛玻璃导航：rgba(18,18,18,.6) + backdrop-filter blur(23px)
   · 字体："M PLUS 1", MiSans, "PingFang SC", 系统无衬线
   · 卡片圆角梯度 12/16/24px；按钮胶囊 100px
   · 动效缓动 cubic-bezier(.16,1,.3,1)（急出缓停）+ reveal 位移入场
   · 图文大卡：底部渐变压暗 + 悬浮信息层；区块标题 32–56px
   ============================================================ */

/* ---------- 基础 ---------- */
:root {
  --bg: #121212;
  --bg-soft: #1a1a1a;
  --bg-card: #1f1f1f;
  --bg-light: #f7f7f7;      /* 亮区底 */
  --bg-light-2: #f2f2f2;
  --ink: #f5f5f5;           /* 暗区文字 */
  --ink-dim: #a3a3a3;
  --ink-dark: #121212;      /* 亮区文字 */
  --ink-dark-soft: #6d6d6d;
  --line: rgba(255,255,255,.09);
  --line-dark: rgba(0,0,0,.08);
  --accent: #1783ff;        /* Kimi 品牌蓝 */
  --accent-deep: #0b6ae0;
  --ease: cubic-bezier(.16,1,.3,1);
  --radius: 16px;
  --radius-lg: 24px;
  --font: "M PLUS 1", MiSans, "PingFang SC", -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --font-num: "SF Mono", ui-monospace, Menlo, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
::selection { background: var(--accent); color: #fff; }

.wrap { width: min(1180px, 92vw); margin: 0 auto; }

/* ---------- 进度条 ---------- */
#progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 0;
  background: var(--accent); z-index: 999;
  transition: width .1s linear;
}

/* ---------- 导航（毛玻璃） ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background .5s var(--ease), border-color .5s var(--ease), backdrop-filter .5s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(18,18,18,.6);
  backdrop-filter: blur(23px) brightness(.8);
  -webkit-backdrop-filter: blur(23px) brightness(.8);
  border-bottom-color: var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; letter-spacing: .02em; }
.mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), #0b5fd0);
  color: #fff; font-weight: 800; font-size: 15px;
  box-shadow: 0 2px 12px rgba(23,131,255,.4);
}
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a {
  font-size: 14.5px; color: var(--ink-dim); position: relative;
  transition: color .3s var(--ease);
}
.nav-links a:hover, .nav-links a.active { color: #fff; }
.nav-links a.nav-cta {
  background: #fff; color: var(--ink-dark); font-weight: 600;
  padding: 8px 18px; border-radius: 100px;
  transition: transform .4s var(--ease), box-shadow .4s var(--ease);
}
.nav-links a.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 4px 20px rgba(255,255,255,.18); }
.menu-btn { display: none; background: none; border: 1px solid var(--line); color: var(--ink); padding: 6px 14px; border-radius: 100px; font-family: inherit; font-size: 13px; cursor: pointer; }

/* ---------- 暗色沉浸 HERO（moonshot 式） ---------- */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  padding: 140px 0 90px;
  overflow: hidden;
  isolation: isolate;
}
.hero::before {              /* 动态光场背景（WebGL 平替：多层蓝紫光晕慢速漂移） */
  content: ""; position: absolute; inset: -20%;
  background:
    radial-gradient(38% 42% at 22% 30%, rgba(23,131,255,.28), transparent 68%),
    radial-gradient(30% 36% at 78% 22%, rgba(56,89,255,.18), transparent 70%),
    radial-gradient(34% 40% at 66% 78%, rgba(23,131,255,.14), transparent 72%),
    radial-gradient(60% 60% at 50% 45%, rgba(10,30,60,.5), transparent);
  animation: aurora 16s ease-in-out infinite alternate;
  z-index: -2;
}
.hero::after {               /* 渐变压暗层（moonshot _gradientOverlay） */
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(to top, var(--bg) 4%, transparent 45%),
              linear-gradient(to bottom, rgba(18,18,18,.75), transparent 30%);
  z-index: -1;
}
@keyframes aurora {
  0%   { transform: translate3d(0,0,0) scale(1) rotate(0deg); }
  50%  { transform: translate3d(2%,-2%,0) scale(1.06) rotate(1.5deg); }
  100% { transform: translate3d(-2%,1%,0) scale(1.02) rotate(-1deg); }
}

.hero .tag {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13.5px; color: var(--ink-dim);
  border: 1px solid var(--line); border-radius: 100px;
  padding: 6px 16px; margin-bottom: 26px;
  background: rgba(255,255,255,.04);
}
.hero .tag::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  animation: dot-pulse 2.4s ease-in-out infinite;
}
@keyframes dot-pulse {
  0%,100% { box-shadow: 0 0 0 0 rgba(23,131,255,.5); }
  50%     { box-shadow: 0 0 0 6px rgba(23,131,255,0); }
}
.hero h1 {
  font-size: clamp(40px, 6vw, 68px);
  line-height: 1.16; font-weight: 700; letter-spacing: -.015em;
  text-wrap: balance;
}
.hero h1 em { font-style: normal; color: var(--accent); }
.hero .slogan {
  margin: 18px 0 0; font-size: clamp(15px,1.6vw,18px);
  color: var(--ink-dim); letter-spacing: .12em; text-transform: uppercase;
}
.hero .sub {
  margin-top: 22px; max-width: 620px;
  font-size: 17px; color: var(--ink-dim);
}
.hero-actions { display: flex; gap: 14px; margin-top: 38px; flex-wrap: wrap; }
.hero-note { margin-top: 16px; font-size: 13.5px; color: var(--ink-dim); }
.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  margin-top: 64px; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; background: var(--line);
}
.hero .stat { background: rgba(18,18,18,.72); backdrop-filter: blur(8px); padding: 22px 24px; }
.hero .stat .num { font-size: 26px; font-weight: 700; color: #fff; font-family: var(--font-num); letter-spacing: -.02em; }
.hero .stat .num small { font-size: 14px; font-weight: 500; color: var(--accent); margin-left: 6px; font-family: var(--font); }
.hero .stat .lab { font-size: 13px; color: var(--ink-dim); margin-top: 4px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; padding: 13px 30px; border-radius: 100px;
  font-size: 15px; font-weight: 600; letter-spacing: .01em;
  transition: transform .45s var(--ease), box-shadow .45s var(--ease), background .45s var(--ease), border-color .45s;
}
.btn:active { transform: scale(.97); }
.btn-primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 4px 24px rgba(23,131,255,.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(23,131,255,.5); background: #2e90ff; }
.btn-dark { background: #fff; color: var(--ink-dark); }
.btn-dark:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(255,255,255,.16); }
.btn-ghost { border: 1px solid rgba(255,255,255,.22); color: #fff; background: rgba(255,255,255,.04); }
.btn-ghost:hover { border-color: rgba(255,255,255,.5); background: rgba(255,255,255,.08); transform: translateY(-2px); }
.btn-outline { border: 1px solid var(--line-dark); color: var(--ink-dark); background: transparent; }
.btn-outline:hover { border-color: var(--ink-dark); transform: translateY(-2px); }

/* ---------- 区块通用 ---------- */
.section { padding: 110px 0; position: relative; }
.section.tight { padding: 80px 0; }
.section-head { max-width: 720px; margin-bottom: 56px; }
.kicker {
  display: inline-block; font-size: 13px; font-weight: 600;
  color: var(--accent); letter-spacing: .14em; text-transform: uppercase;
  margin-bottom: 16px;
}
.title { font-size: clamp(28px, 3.6vw, 44px); font-weight: 700; line-height: 1.25; letter-spacing: -.012em; text-wrap: balance; }
.lead { margin-top: 18px; font-size: 16.5px; color: var(--ink-dim); max-width: 640px; }

/* 亮区（浅灰分区，Kimi 式） */
.section.light { background: var(--bg-light); color: var(--ink-dark); }
.section.light .kicker { color: var(--accent); }
.section.light .lead { color: var(--ink-dark-soft); }
.section.light-2 { background: var(--bg-light-2); color: var(--ink-dark); }
.section.light-2 .lead { color: var(--ink-dark-soft); }

/* ---------- 痛点 ---------- */
.pains { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.pain {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px 32px;
  transition: transform .5s var(--ease), border-color .5s var(--ease), background .5s;
}
.pain:hover { transform: translateY(-4px); border-color: rgba(23,131,255,.4); background: #232323; }
.pain .no {
  font-family: var(--font-num); font-size: 13px; color: var(--accent);
  letter-spacing: .1em; display: block; margin-bottom: 14px;
}
.pain p { font-size: 15px; color: var(--ink-dim); }
.pain strong { color: var(--ink); font-weight: 600; display: block; margin-bottom: 8px; font-size: 16px; }

/* ---------- 服务网格 ---------- */
.svc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.svc {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 32px 30px;
  transition: transform .5s var(--ease), border-color .5s, background .5s;
}
.svc:hover { transform: translateY(-5px); border-color: rgba(23,131,255,.45); }
.svc .idx { font-family: var(--font-num); font-size: 12.5px; color: var(--accent); letter-spacing: .12em; margin-bottom: 16px; }
.svc h3 { font-size: 19px; font-weight: 700; margin-bottom: 12px; }
.svc p { font-size: 14.5px; color: var(--ink-dim); }
.svc.wide { grid-column: span 2; display: flex; }
.svc-body { padding: 0; }

/* ---------- 深色闭环区 ---------- */
.loop .loop-steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; margin: 48px 0 32px; }
.loop-step {
  background: rgba(255,255,255,.04); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px 20px;
  transition: transform .5s var(--ease), border-color .5s, background .5s;
}
.loop-step:hover { transform: translateY(-4px); border-color: rgba(23,131,255,.5); background: rgba(23,131,255,.08); }
.loop-step .no {
  width: 34px; height: 34px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(23,131,255,.15); color: var(--accent);
  font-weight: 700; font-family: var(--font-num); margin-bottom: 14px;
}
.loop-step h4 { font-size: 15.5px; font-weight: 700; margin-bottom: 8px; }
.loop-step p { font-size: 13px; color: var(--ink-dim); line-height: 1.65; }
.loop-back {
  border-left: 2px solid var(--accent); padding: 4px 0 4px 18px;
  font-size: 14.5px; color: var(--ink-dim); max-width: 720px;
}

/* ---------- 价格 ---------- */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
.plan {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 36px 32px;
  display: flex; flex-direction: column;
  transition: transform .5s var(--ease), border-color .5s;
}
.plan:hover { transform: translateY(-5px); border-color: rgba(255,255,255,.2); }
.plan h3 { font-size: 20px; font-weight: 700; }
.plan .for { font-size: 13.5px; color: var(--ink-dim); margin: 10px 0 22px; line-height: 1.6; }
.plan ul { display: grid; gap: 11px; margin-bottom: 26px; }
.plan li { font-size: 14px; color: var(--ink-dim); padding-left: 20px; position: relative; }
.plan li::before {
  content: ""; position: absolute; left: 0; top: 9px;
  width: 12px; height: 12px; border-radius: 50%;
  background: rgba(23,131,255,.15) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%231783ff' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6L9 17l-5-5'/%3E%3C/svg%3E") center/9px no-repeat;
}
.plan .price { margin-top: auto; padding-top: 8px; }
.plan .amount { font-size: 34px; font-weight: 700; letter-spacing: -.02em; font-family: var(--font-num); }
.plan .amount small { font-size: 14px; color: var(--ink-dim); font-weight: 500; margin-left: 4px; font-family: var(--font); }
.plan .yearly { display: block; font-size: 13px; color: var(--accent); margin-top: 8px; }
.plan .price > small { display: block; font-size: 12px; color: var(--ink-dim); margin-top: 6px; }
.plan .btn { margin-top: 22px; width: 100%; }
.plan.hot {
  background: linear-gradient(160deg, rgba(23,131,255,.16), rgba(23,131,255,.05) 55%), var(--bg-card);
  border-color: rgba(23,131,255,.5);
  position: relative;
  box-shadow: 0 20px 60px rgba(23,131,255,.18);
}
.hot-tag {
  position: absolute; top: -13px; left: 32px;
  background: var(--accent); color: #fff; font-size: 12px; font-weight: 600;
  padding: 5px 14px; border-radius: 100px;
  box-shadow: 0 4px 16px rgba(23,131,255,.45);
}
.subscribe-points { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 56px; }
.spoint {
  border-top: 1px solid var(--line); padding-top: 20px;
}
.spoint h4 { font-size: 15px; font-weight: 700; margin-bottom: 8px; }
.spoint p { font-size: 13.5px; color: var(--ink-dim); }

/* ---------- 案例（moonshot 图文大卡式） ---------- */
.case {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 36px 38px;
  margin-bottom: 20px;
  transition: transform .5s var(--ease), border-color .5s;
  position: relative; overflow: hidden;
}
.case::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(60% 120% at 90% 0%, rgba(23,131,255,.1), transparent 60%);
  pointer-events: none;
}
.case:hover { transform: translateY(-4px); border-color: rgba(23,131,255,.4); }
.case .meta {
  font-family: var(--font-num); font-size: 12.5px; color: var(--accent);
  letter-spacing: .1em; margin-bottom: 14px;
}
.case h3 { font-size: clamp(20px, 2.4vw, 26px); font-weight: 700; letter-spacing: -.01em; }
.case p { margin-top: 12px; font-size: 15px; color: var(--ink-dim); max-width: 760px; }
.case .result {
  display: inline-block; margin-top: 20px;
  background: rgba(23,131,255,.1); border: 1px solid rgba(23,131,255,.3);
  border-radius: 100px; padding: 8px 18px;
  font-size: 13.5px; font-weight: 600; color: #9dcbff; font-family: var(--font-num);
}

/* ---------- FAQ ---------- */
.faq-item {
  border-bottom: 1px solid var(--line); padding: 24px 0;
}
.faq-item h4 {
  font-size: 16.5px; font-weight: 600; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  transition: color .3s;
}
.faq-item h4::after {
  content: "+"; font-size: 22px; font-weight: 300; color: var(--ink-dim);
  transition: transform .45s var(--ease), color .3s;
}
.faq-item h4:hover { color: #fff; }
.faq-item.open h4::after { transform: rotate(45deg); color: var(--accent); }
.faq-item p { max-height: 0; overflow: hidden; transition: max-height .5s var(--ease), padding .5s var(--ease); font-size: 14.5px; color: var(--ink-dim); }
.faq-item.open p { max-height: 220px; padding-top: 12px; }

/* ---------- CTA band ---------- */
.cta-band {
  text-align: center; padding: 120px 0;
  position: relative; overflow: hidden; isolation: isolate;
}
.cta-band::before {
  content: ""; position: absolute; inset: -20%; z-index: -1;
  background: radial-gradient(40% 50% at 30% 40%, rgba(23,131,255,.25), transparent 65%),
              radial-gradient(35% 45% at 72% 60%, rgba(56,89,255,.18), transparent 70%);
  animation: aurora 14s ease-in-out infinite alternate;
}
.cta-band h2 { font-size: clamp(30px, 4vw, 48px); font-weight: 700; letter-spacing: -.015em; }
.cta-band p { margin: 18px auto 0; max-width: 560px; color: var(--ink-dim); font-size: 16px; }
.cta-band .hero-actions { justify-content: center; }

/* ---------- 页脚 ---------- */
footer { border-top: 1px solid var(--line); padding: 64px 0 36px; background: #0d0d0d; }
.foot-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 40px; }
.foot-grid h5 { font-size: 13px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-dim); margin-bottom: 16px; }
.foot-grid a { display: block; font-size: 14px; color: var(--ink-dim); padding: 4px 0; transition: color .3s; }
.foot-grid a:hover { color: #fff; }
.foot-grid p { font-size: 14px; color: var(--ink-dim); }
.foot-slogan { font-size: 13px; color: var(--ink-dim); letter-spacing: .1em; text-transform: uppercase; margin-top: 6px; }
.foot-base {
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  border-top: 1px solid var(--line); margin-top: 48px; padding-top: 24px;
  font-size: 12.5px; color: #6d6d6d;
}

/* ---------- 内页 page-head ---------- */
.page-head { padding: 170px 0 70px; position: relative; overflow: hidden; isolation: isolate; }
.page-head::before {
  content: ""; position: absolute; inset: -20%; z-index: -1;
  background: radial-gradient(36% 45% at 24% 20%, rgba(23,131,255,.2), transparent 65%);
  animation: aurora 18s ease-in-out infinite alternate;
}
.page-head .crumb { font-family: var(--font-num); font-size: 12.5px; color: var(--ink-dim); letter-spacing: .08em; margin-bottom: 18px; }
.page-head .crumb a:hover { color: #fff; }
.page-head h1 { font-size: clamp(34px, 4.6vw, 56px); font-weight: 700; letter-spacing: -.015em; line-height: 1.18; }
.page-sub { margin-top: 18px; font-size: 16.5px; color: var(--ink-dim); max-width: 640px; }

/* ---------- 服务详情页 ---------- */
.svc-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.svc-detail h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 700; letter-spacing: -.01em; margin-bottom: 18px; }
.pts { display: grid; gap: 14px; }
.pts li {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px 24px;
  font-size: 14.5px; color: var(--ink-dim);
  transition: transform .5s var(--ease), border-color .5s;
}
.pts li:hover { transform: translateX(4px); border-color: rgba(23,131,255,.4); }
.pts strong { color: var(--ink); font-weight: 600; }
.chain { margin-top: 64px; }
.chain-step {
  display: flex; gap: 20px; align-items: flex-start;
  padding: 20px 0; border-bottom: 1px solid var(--line);
}
.chain-step .no {
  flex: 0 0 auto; width: 32px; height: 32px; border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(23,131,255,.15); color: var(--accent);
  font-weight: 700; font-family: var(--font-num); font-size: 14px;
}
.chain-step h4 { font-size: 15.5px; font-weight: 700; }
.chain-step p { font-size: 14px; color: var(--ink-dim); margin-top: 4px; }

/* ---------- 知识库 band ---------- */
.kb-band {
  border: 1px solid rgba(23,131,255,.35); border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(23,131,255,.12), rgba(23,131,255,.03) 60%), var(--bg-card);
  padding: 44px 46px; margin: 72px 0;
}
.kb-band h3 { font-size: 22px; font-weight: 700; margin-bottom: 12px; }
.kb-band p { color: var(--ink-dim); font-size: 15px; max-width: 720px; }
.kb-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px 28px; margin-top: 24px; }
.kb-list li { font-size: 14px; color: var(--ink-dim); padding-left: 20px; position: relative; }
.kb-list li::before { content: "→"; position: absolute; left: 0; color: var(--accent); }

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 56px; align-items: start; }
.contact-ways { display: grid; gap: 14px; margin-top: 30px; }
.way {
  display: flex; align-items: center; gap: 14px;
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px 22px;
  transition: transform .5s var(--ease), border-color .5s;
}
.way:hover { transform: translateY(-2px); border-color: rgba(23,131,255,.4); }
.way .ico { font-size: 18px; }
.way strong { font-size: 14.5px; display: block; }
.way span { font-size: 13.5px; color: var(--ink-dim); }
.form-card {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 38px 36px;
}
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13.5px; color: var(--ink-dim); margin-bottom: 8px; }
.field input, .field textarea, .field select {
  width: 100%; background: rgba(255,255,255,.04); border: 1px solid var(--line);
  border-radius: 12px; padding: 13px 16px; color: var(--ink);
  font-family: inherit; font-size: 14.5px;
  transition: border-color .4s var(--ease), background .4s;
}
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none; border-color: var(--accent); background: rgba(23,131,255,.06);
  box-shadow: 0 0 0 3px rgba(23,83,255,.15);
}
.field textarea { min-height: 120px; resize: vertical; }

/* ---------- 入场动效 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.rise { opacity: 0; transform: translateY(34px); transition: opacity 1s var(--ease), transform 1s var(--ease); }
.rise.in { opacity: 1; transform: none; }
.d1 { transition-delay: .1s; } .d2 { transition-delay: .2s; }
.d3 { transition-delay: .3s; } .d4 { transition-delay: .4s; }

/* ---------- 亮区组件反转（.light 区内卡片） ---------- */
.light .pain, .light .svc, .light .plan, .light .case, .light .pts li,
.light .way, .light .form-card, .light .loop-step {
  background: #fff; border-color: var(--line-dark);
  box-shadow: 0 2px 20px rgba(0,0,0,.04);
}
.light .pain:hover, .light .svc:hover, .light .plan:hover, .light .case:hover { box-shadow: 0 16px 44px rgba(0,0,0,.1); }
.light .pain strong { color: var(--ink-dark); }
.light .pain p, .light .svc p, .light .plan .for, .light .plan li,
.light .case p, .light .lead, .light .spoint p { color: var(--ink-dark-soft); }
.light .case .result { background: rgba(23,131,255,.08); color: var(--accent-deep); }
.light .plan.hot { background: linear-gradient(160deg, rgba(23,131,255,.08), rgba(23,131,255,.02) 55%), #fff; }
.light .faq-item { border-color: var(--line-dark); }
.light .faq-item h4 { color: var(--ink-dark); }
.light .faq-item h4:hover { color: var(--accent-deep); }
.light .faq-item h4::after { color: var(--ink-dark-soft); }
.light .faq-item p { color: var(--ink-dark-soft); }

/* ---------- 响应式 ---------- */
@media (max-width: 1020px) {
  .svc-grid, .plans { grid-template-columns: repeat(2, 1fr); }
  .svc.wide { grid-column: span 2; }
  .loop-steps { grid-template-columns: repeat(2, 1fr); }
  .subscribe-points { grid-template-columns: repeat(2, 1fr); }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .foot-grid { grid-template-columns: repeat(2, 1fr); }
  .svc-detail, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
}
@media (max-width: 680px) {
  .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: rgba(18,18,18,.96); backdrop-filter: blur(23px);
    flex-direction: column; padding: 24px 6vw 28px; gap: 18px;
    border-bottom: 1px solid var(--line);
  }
  .nav-links.open { display: flex; }
  .menu-btn { display: block; }
  .pains { grid-template-columns: 1fr; }
  .svc-grid, .plans { grid-template-columns: 1fr; }
  .loop-steps { grid-template-columns: 1fr; }
  .subscribe-points { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .section { padding: 72px 0; }
  .hero h1 { font-size: clamp(32px, 9vw, 44px); }
  .page-head { padding: 130px 0 50px; }
  .kb-band { padding: 30px 24px; }
  .kb-list { grid-template-columns: 1fr; }
  .form-card { padding: 28px 22px; }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal, .rise { opacity: 1; transform: none; }
}

/* ---------- 补充 ---------- */
.arrow-link { display: inline-block; font-weight: 600; font-size: 15px; color: var(--accent); transition: transform .4s var(--ease); }
.arrow-link:hover { transform: translateX(4px); }
.on { border-color: rgba(23,131,255,.55) !important; background: rgba(23,131,255,.1) !important; }
.placeholder-blank {
  display: inline-block; min-width: 120px; height: 1em; vertical-align: middle;
  border-bottom: 1px dashed var(--ink-dim);
}
.go { color: var(--accent); font-weight: 600; transition: transform .4s var(--ease); display: inline-block; }
.go:hover { transform: translateX(4px); }