/* LunarTulip Research Desk · 售前页
   视觉语言对齐官网 lunartuliplab.com(源码审计 D:\webofficial):
   - 冷调纸白 #f4f5f3 + 墨色 #111820,雾蓝 #718c9f 强调,珊瑚 #c98d73 暖点缀
   - Inter / PingFang SC 正文,等宽字体做眉标(小号大写、宽字距)
   - 圆角克制:4 / 7 / 10px;细发丝线 #d9dedf / #adb7bb
   - 主 CTA 为深色渐变按钮(#1a303d→#2a4656→#1d3441),80px 网格纸底纹
   无框架、无外链字体,大陆访问友好。 */

:root {
  --paper: #f4f5f3;
  --white: #ffffff;
  --ink: #111820;
  --ink-dim: #5f6973;
  --muted: #68747d;
  --line: #d9dedf;
  --line-strong: #adb7bb;
  --blue: #718c9f;
  --blue-bright: #c9dce5;
  --accent-rgb: 113,140,159;
  --coral: #c98d73;
  --radius-sm: 4px;
  --radius-control: 7px;
  --radius-surface: 10px;
  --surface-dark-base: #0e151c;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
  background:
    linear-gradient(rgba(20,25,31,.027) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20,25,31,.027) 1px, transparent 1px),
    var(--paper);
  background-size: 80px 80px, 80px 80px, auto;
  color: var(--ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

::selection { color: #f8fbfb; background: #466575; }

b { font-weight: 650; }

/* ---------- 顶栏 ---------- */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px clamp(20px, 5vw, 48px);
  border-bottom: 1px solid rgba(184,192,198,.7);
  background: rgba(244, 245, 243, 0.86);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(18px) saturate(130%);
}
.brand { display: flex; align-items: center; gap: 11px; font-weight: 700; font-size: 16px; letter-spacing: -.04em; }
.brand .logo {
  width: 30px; height: 30px;
  display: inline-flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #1a303d, #2a4656);
  color: #f5f8f9;
  border-radius: var(--radius-control); font-size: 15px;
  box-shadow: inset 0 1px 0 rgba(246,251,251,.35);
}
.brand .dim { color: var(--muted); font-weight: 500; }
.top-cta {
  padding: 9px 20px;
  background: linear-gradient(112deg, #1a303d 0%, #2a4656 50%, #1d3441 100%);
  color: #fff;
  border: 1px solid rgba(190,211,221,.26);
  border-radius: var(--radius-control); font-size: 13px; font-weight: 600;
  text-decoration: none;
  box-shadow: 0 8px 20px rgba(35,63,78,.18), inset 0 1px 0 rgba(246,251,251,.4);
  transition: transform .2s ease, box-shadow .2s ease;
}
.top-cta:hover { transform: translateY(-1px); box-shadow: 0 12px 26px rgba(35,63,78,.24), inset 0 1px 0 rgba(246,251,251,.5); }

/* ---------- 通用节 ---------- */
section { padding: clamp(64px, 10vw, 132px) clamp(20px, 5vw, 48px); max-width: 1120px; margin: 0 auto; }
.eyebrow, .section-eyebrow {
  color: #737d87;
  font: 11px/1.4 var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: 22px;
}
h2 { font-size: clamp(27px, 3.4vw, 38px); letter-spacing: -.045em; line-height: 1.4; font-weight: 600; margin-bottom: 14px; }

/* ---------- Hero ---------- */
.hero { text-align: center; padding-top: clamp(80px, 11vw, 128px); }
.hero h1 {
  font-size: clamp(35px, 5.6vw, 54px);
  line-height: 1.32; letter-spacing: -.04em;
  font-weight: 700;
  margin-bottom: 24px;
}
.hero-sub {
  font-size: clamp(15px, 1.8vw, 17px);
  color: var(--ink-dim);
  line-height: 1.85;
  max-width: 640px; margin: 0 auto 40px;
}
.hero-sub b { color: var(--ink); }
.hero-cta { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }

.btn-primary {
  display: inline-block;
  padding: 15px 34px;
  background:
    radial-gradient(ellipse 62% 138% at 62% 48%, rgba(221,233,235,.7) 0%, rgba(137,164,175,.48) 31%, rgba(71,99,114,.2) 58%, transparent 76%),
    linear-gradient(112deg, #1a303d 0%, #2a4656 50%, #1d3441 100%);
  color: #fff;
  border: 1px solid rgba(190,211,221,.26);
  border-radius: var(--radius-control);
  font-size: 15px; font-weight: 600;
  text-decoration: none; cursor: pointer;
  box-shadow:
    0 16px 38px rgba(35,63,78,.24),
    0 12px 30px rgba(126,151,160,.15),
    inset 0 1px 0 rgba(246,251,251,.5),
    inset 0 -1px 0 rgba(5,17,25,.18);
  transition: transform .2s ease, box-shadow .2s ease;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 44px rgba(35,63,78,.3), 0 14px 34px rgba(126,151,160,.2), inset 0 1px 0 rgba(246,251,251,.62);
}
.btn-ghost {
  display: inline-block;
  padding: 15px 34px;
  background: rgba(255,255,255,.38); color: #46515a;
  border: 1px solid var(--line-strong); border-radius: var(--radius-control);
  font-size: 14px; font-weight: 500;
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, background .2s ease, transform .2s ease;
}
.btn-ghost:hover { color: var(--ink); border-color: #8f999f; background: rgba(255,255,255,.72); transform: translateY(-2px); }

/* ---------- 价值点 ---------- */
.values { text-align: center; }
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
  text-align: left;
}
.value-card {
  background: linear-gradient(145deg, rgba(255,255,255,.85), rgba(255,255,255,.55));
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-surface);
  padding: 32px 28px;
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.7);
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
}
.value-card::before {
  content: "";
  position: absolute;
  top: 0; left: 28px; right: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), rgba(201,141,115,.72));
  transition: right .36s ease;
}
.value-card:hover { transform: translateY(-3px); border-color: #8fa1aa; box-shadow: 0 24px 54px rgba(37,53,63,.1), inset 0 1px 0 rgba(255,255,255,.78); }
.value-card:hover::before { right: 28px; }
.value-card h3 { font-size: 19px; letter-spacing: -.025em; margin-bottom: 4px; }
.value-tag {
  color: #77818a;
  font: 10px/1.4 var(--mono);
  letter-spacing: .08em; text-transform: uppercase;
  margin-bottom: 16px;
}
.value-card p:last-child { color: var(--ink-dim); font-size: 13.5px; line-height: 1.8; }

/* ---------- 产品一瞥 ---------- */
.glance { text-align: center; }
.glance-sub { color: var(--ink-dim); font-size: 15px; max-width: 560px; margin: 0 auto; }
.glance-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  margin-top: 48px;
  text-align: left;
}
.glance-grid figure:first-child { grid-column: 1 / -1; }
.glance-grid figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-surface);
  overflow: hidden;
  background: var(--white);
  box-shadow: 0 24px 64px rgba(35,49,58,.07);
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
}
.glance-grid figure:hover { transform: translateY(-3px); border-color: #8fa1aa; box-shadow: 0 28px 70px rgba(35,49,58,.11); }
.glance-grid img { display: block; width: 100%; height: auto; border-bottom: 1px solid var(--line); }
.glance-grid figcaption {
  display: flex; justify-content: space-between; align-items: baseline; gap: 14px;
  padding: 14px 18px;
}
.glance-grid figcaption b { font-size: 13px; font-weight: 650; letter-spacing: -.01em; white-space: nowrap; }
.glance-grid figcaption span { color: var(--muted); font-size: 12px; line-height: 1.6; text-align: right; }
.glance-note {
  margin: 26px auto 0;
  width: fit-content;
  padding: 8px 14px;
  color: #77818a;
  font: 10px/1.5 var(--mono);
  letter-spacing: .06em;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,.5);
}

/* ---------- 数字区 ---------- */
.numbers { text-align: center; }
.num-grid {
  display: flex; justify-content: center; gap: clamp(32px, 8vw, 96px);
  margin: 40px 0 24px;
}
.num-value {
  font-size: clamp(40px, 6vw, 56px);
  font-weight: 500; letter-spacing: -.06em;
  color: var(--muted);
  font-family: var(--mono);
}
.num-label { color: var(--ink-dim); font-size: 13px; margin-top: 4px; }
.num-note {
  color: var(--muted); font-size: 12.5px;
  max-width: 580px; margin: 0 auto;
  padding: 14px 20px;
  background: rgba(255,255,255,.5);
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
}

/* ---------- Request Demo ---------- */
.request { text-align: center; }
.request-sub { color: var(--ink-dim); font-size: 15px; max-width: 520px; margin: 0 auto 40px; }
.demo-form {
  max-width: 460px; margin: 0 auto; text-align: left;
  background: linear-gradient(145deg, rgba(255,255,255,.92), rgba(255,255,255,.7));
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-surface);
  padding: 34px 32px;
  box-shadow: 0 24px 64px rgba(35,49,58,.07), inset 0 1px 0 rgba(255,255,255,.8);
}
.form-row { margin-bottom: 18px; }
.form-row label {
  display: block;
  font-size: 13px; font-weight: 650;
  margin-bottom: 6px;
}
.form-row input, .form-row textarea {
  width: 100%;
  padding: 10px 12px;
  font-size: 14px;
  font-family: inherit;
  color: var(--ink);
  background: rgba(244,245,243,.6);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-control);
}
.form-row input::placeholder, .form-row textarea::placeholder { color: #9aa4ac; }
.form-row input:focus, .form-row textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb),.14);
}
.btn-submit { width: 100%; margin-top: 4px; border: 1px solid rgba(190,211,221,.26); }
.form-note { color: var(--muted); font-size: 12px; margin-top: 14px; text-align: center; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid #29323b;
  padding: 44px clamp(20px, 5vw, 48px) 52px;
  text-align: center;
  color: #7e8891;
  font-size: 12.5px;
  background:
    radial-gradient(circle at 50% 0%, rgba(var(--accent-rgb),.08), transparent 42%),
    var(--surface-dark-base);
}
.footer-brand { color: #fff; font-size: 15px; font-weight: 700; letter-spacing: -.02em; margin-bottom: 6px; }
.compliance {
  max-width: 660px;
  margin: 22px auto 0;
  padding: 16px 22px;
  background: rgba(255,255,255,.02);
  border: 1px solid #35414a;
  border-radius: var(--radius-control);
  color: #929fa8;
  text-align: left;
  font-size: 12px;
  line-height: 1.8;
}
.compliance p { margin: 3px 0; }
.compliance b { color: #c9b3a3; font-weight: 650; }

@media (max-width: 820px) {
  .value-grid { grid-template-columns: 1fr; }
  .glance-grid { grid-template-columns: 1fr; }
  .glance-grid figcaption { flex-direction: column; align-items: flex-start; gap: 4px; }
  .glance-grid figcaption span { text-align: left; }
}