/* ===================================================================
   开品官 · KAIPIN —— Apple 风格设计系统
   留白、大字、轻字重、克制的色彩。中文用苹方(PingFang SC)。
=================================================================== */
:root{
  --ink:#1d1d1f; --ink-2:#424245; --muted:#6e6e73;
  --bg:#ffffff; --bg-gray:#f5f5f7; --bg-dark:#0b0b0d;
  --line:#d2d2d7; --blue:#0071e3; --blue-d:#0058b8;
  --radius:20px; --maxw:1040px;
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","PingFang SC","Helvetica Neue","Microsoft YaHei",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--bg);
  -webkit-font-smoothing:antialiased;line-height:1.5;letter-spacing:-.01em}
a{color:inherit;text-decoration:none}
strong{font-weight:600}

/* ---------- 导航 ---------- */
.nav{position:sticky;top:0;z-index:50;height:52px;
  background:rgba(255,255,255,0);transition:background .3s,backdrop-filter .3s,border-color .3s;
  border-bottom:1px solid transparent}
.nav.scrolled{background:rgba(255,255,255,.72);backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:var(--maxw);margin:0 auto;height:100%;padding:0 22px;
  display:flex;align-items:center;justify-content:space-between}
.brand{font-size:19px;font-weight:600;letter-spacing:0}
.brand-en{font-size:11px;font-weight:600;color:var(--muted);margin-left:7px;letter-spacing:.18em;vertical-align:1px}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-links a{font-size:13.5px;color:var(--ink-2);transition:color .2s}
.nav-links a:hover{color:var(--ink)}
.nav-cta{background:var(--blue);color:#fff!important;padding:6px 15px;border-radius:980px;font-weight:500}
.nav-cta:hover{background:var(--blue-d)}

/* ---------- 通用 ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.narrow{max-width:760px}
.center{text-align:center}
.eyebrow{font-size:15px;font-weight:600;color:var(--blue);margin-bottom:14px;letter-spacing:0}
.eyebrow.light{color:#2997ff}
.band{padding:110px 0}
.band-gray{background:var(--bg-gray)}
.band-dark{background:var(--bg-dark);color:#f5f5f7}
.band-title{font-size:clamp(30px,4.6vw,52px);font-weight:600;line-height:1.08;letter-spacing:-.02em}
.band-title.light{color:#f5f5f7}
.band-body{font-size:clamp(17px,2vw,21px);color:var(--ink-2);margin-top:26px;line-height:1.55}
.light .band-body,.band-body.light{color:#a1a1a6}
.band-dark .band-body strong,.band-dark strong{color:#fff}

/* ---------- 按钮 ---------- */
.btn{display:inline-block;font-size:16px;font-weight:500;padding:11px 26px;border-radius:980px;
  cursor:pointer;border:none;transition:.2s;line-height:1.4}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-d)}
.btn-ghost{background:transparent;color:var(--blue)}
.btn-ghost:hover{text-decoration:underline}
.btn-lg{font-size:18px;padding:13px 32px}
.btn-block{display:block;width:100%;text-align:center}

/* ---------- HERO ---------- */
.hero{padding:88px 22px 96px;text-align:center;
  background:radial-gradient(1200px 600px at 50% -10%, #eef4ff 0%, #fff 60%)}
.hero-title{font-size:clamp(40px,7vw,80px);font-weight:600;line-height:1.05;letter-spacing:-.03em;margin:8px 0 0}
.hero-sub{font-size:clamp(18px,2.4vw,24px);color:var(--ink-2);margin:24px auto 0;max-width:640px;line-height:1.45}
.hero-cta{margin:34px 0 14px;display:flex;gap:22px;justify-content:center;align-items:center;flex-wrap:wrap}
.hero-price{font-size:14px;color:var(--muted);margin-top:8px}

/* ---------- 步骤 ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:56px;text-align:left}
.step{padding:30px 24px;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
.step-no{font-size:13px;font-weight:700;color:var(--blue);letter-spacing:.1em}
.step h3{font-size:20px;font-weight:600;margin:14px 0 8px}
.step p{font-size:15px;color:var(--muted);line-height:1.5}

/* ---------- 报告卡片 ---------- */
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin-top:54px;text-align:left}
.card{background:#fff;border-radius:var(--radius);padding:38px 34px;box-shadow:0 4px 24px rgba(0,0,0,.05);
  transition:transform .3s,box-shadow .3s}
.card:hover{transform:translateY(-4px);box-shadow:0 14px 40px rgba(0,0,0,.09)}
.card-k{font-size:13px;font-weight:700;color:var(--blue);letter-spacing:.12em}
.card h3{font-size:24px;font-weight:600;margin:10px 0 12px;letter-spacing:-.01em}
.card p{font-size:16px;color:var(--ink-2);line-height:1.55}

/* ---------- 背书徽章 ---------- */
.badges{display:flex;gap:18px;justify-content:center;flex-wrap:wrap;margin-top:46px}
.badge{background:rgba(255,255,255,.06);border:1px solid #2a2a2e;border-radius:16px;padding:22px 28px;min-width:200px}
.badge b{display:block;font-size:21px;color:#fff;font-weight:600}
.badge span{display:block;font-size:13.5px;color:#a1a1a6;margin-top:6px}

/* ---------- 定价 ---------- */
.prices{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:52px}
.price-card{position:relative;border:1px solid var(--line);border-radius:var(--radius);padding:34px 22px;background:#fff;text-align:center}
.price-card.featured{border:2px solid var(--blue);box-shadow:0 12px 36px rgba(0,113,227,.14)}
.price-tag{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--blue);color:#fff;
  font-size:12px;font-weight:600;padding:4px 13px;border-radius:980px}
.price-uses{font-size:15px;color:var(--muted);font-weight:500}
.price-num{font-size:40px;font-weight:600;margin:8px 0 2px;letter-spacing:-.02em}
.price-per{font-size:13px;color:var(--muted);margin-bottom:20px}
.price-foot{margin-top:34px;font-size:15px;color:var(--ink-2)}

/* ---------- 收尾 ---------- */
.closing{padding:130px 22px;text-align:center;
  background:radial-gradient(900px 500px at 50% 120%,#eef4ff,#fff 70%)}
.closing-title{font-size:clamp(32px,5vw,58px);font-weight:600;line-height:1.08;letter-spacing:-.02em;margin-bottom:34px}

/* ---------- 表单页 ---------- */
.form-page{padding:70px 0 110px;min-height:70vh}
.form-title{font-size:clamp(28px,4vw,44px);font-weight:600;letter-spacing:-.02em}
.form-lead{font-size:17px;color:var(--muted);margin:14px 0 32px;line-height:1.5}
.demo-note{background:#fff7e6;border:1px solid #ffe2a8;color:#8a6d3b;font-size:14px;
  padding:12px 16px;border-radius:12px;margin-bottom:24px}
.kform{display:flex;flex-direction:column;gap:26px;text-align:left}
.field{display:flex;flex-direction:column}
.field-label{font-size:15px;font-weight:600;margin-bottom:10px}
.field input,.field textarea{font-family:var(--font);font-size:16px;color:var(--ink);
  border:1px solid var(--line);border-radius:14px;padding:14px 16px;background:#fff;transition:border .2s,box-shadow .2s;width:100%}
.field textarea{resize:vertical;line-height:1.6}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 4px rgba(0,113,227,.12)}
.field-hint{font-size:13px;color:var(--muted);margin-top:8px}
.form-err{color:#d70015;font-size:14px;min-height:18px;text-align:center;margin-top:6px}

/* 套餐选择 */
.pick{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.pick-item{border:1px solid var(--line);border-radius:14px;padding:18px 10px;text-align:center;cursor:pointer;transition:.2s}
.pick-item:hover{border-color:#b0b0b6}
.pick-item.checked{border-color:var(--blue);background:#f3f8ff;box-shadow:0 0 0 3px rgba(0,113,227,.1)}
.pick-item input{display:none}
.pick-uses{display:block;font-size:17px;font-weight:600}
.pick-price{display:block;font-size:15px;margin:4px 0 2px}
.pick-per{display:block;font-size:12px;color:var(--muted)}

/* ---------- 进度 ---------- */
.proc-ring{position:relative;width:140px;height:140px;margin:10px auto 30px}
.proc-ring svg{transform:rotate(-90deg);width:140px;height:140px}
.ring-bg{fill:none;stroke:var(--line);stroke-width:8}
.ring-fg{fill:none;stroke:var(--blue);stroke-width:8;stroke-linecap:round;transition:stroke-dashoffset .8s ease}
.proc-pct{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:26px;font-weight:600}
.proc-log{margin:30px auto 0;max-width:560px;height:170px;overflow-y:auto;text-align:left;
  background:var(--bg-gray);border-radius:14px;padding:16px 18px;font-size:13px;color:var(--ink-2);
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;line-height:1.8}

/* ---------- 结果 + 评价 ---------- */
.done-mark{width:74px;height:74px;border-radius:50%;background:var(--blue);color:#fff;font-size:38px;
  display:flex;align-items:center;justify-content:center;margin:0 auto 24px}
.review-box{margin:54px auto 0;max-width:580px;text-align:left;background:var(--bg-gray);
  border-radius:var(--radius);padding:34px 30px}
.review-head h2{font-size:21px;font-weight:600}
.review-head h2 span{color:var(--blue)}
.review-head p{font-size:14px;color:var(--muted);margin:8px 0 18px}
.review-box .field{margin-top:16px}
.stars{font-size:34px;color:#d2d2d7;display:flex;gap:8px;cursor:pointer}
.star{transition:color .15s,transform .15s}
.star:hover{transform:scale(1.12)}
.star.on{color:#ffb400}
.review-box .btn{margin-top:22px}
.review-thanks{font-size:19px;font-weight:600;text-align:center;color:var(--ink);padding:30px 10px}

/* ---------- 滚动渐显 ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- 页脚 ---------- */
.footer{background:var(--bg-gray);border-top:1px solid var(--line);padding:46px 22px;text-align:center}
.footer-brand{font-size:17px;font-weight:600}
.footer-line{font-size:14px;color:var(--ink-2);margin-top:10px}
.footer-mini{font-size:12px;color:var(--muted);margin-top:14px;line-height:1.7;max-width:720px;margin-left:auto;margin-right:auto}

/* ---------- 响应式 ---------- */
@media(max-width:860px){
  .nav-links a:not(.nav-cta){display:none}
  .steps,.cards,.prices,.pick{grid-template-columns:1fr;gap:16px}
  .cards{grid-template-columns:1fr}
  .band{padding:72px 0}
}
@media(min-width:861px) and (max-width:1040px){
  .prices{grid-template-columns:repeat(2,1fr)}
}