/* Noeta 官网 — 共用样式
 * 品牌色取自 app 主题与定稿图标 06「双星相知」:
 *   冷紫 #6B61E8 = app 的 energy/CTA 色;青绿 #1F9D80 = AI 化身色
 *   深夜底 #0B0E14 + 月光银 #E6E9F0/#AEB6C8 = 图标与 app 内星图同源
 * 中英两页共用本文件,避免视觉漂移。
 */

:root {
  --violet: #6b61e8;
  --violet-soft: rgba(107, 97, 232, 0.1);
  --teal: #1f9d80;
  --night: #0b0e14;
  --silver: #e6e9f0;
  --silver-dim: #aeb6c8;

  --surface: #f3f4f8;
  --card: #ffffff;
  --ink: #1a1d26;
  --ink-2: #646a7c;
  --ink-3: #a0a5b4;
  --hairline: #e2e5ec;

  --wrap: 1080px;
  --radius: 16px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--card);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; }
a { color: inherit; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}

/* —— 顶栏 —— */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(11, 14, 20, 0.88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid rgba(174, 182, 200, 0.14);
}
.nav .wrap {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 60px;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--silver);
  text-decoration: none;
  letter-spacing: 0.01em;
  margin-right: auto;
}
.brand svg { width: 26px; height: 26px; display: block; }
.nav-links { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.nav-links a {
  color: var(--silver-dim);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--silver); }
.lang {
  font-size: 13px;
  color: var(--silver-dim);
  text-decoration: none;
  border: 1px solid rgba(174, 182, 200, 0.3);
  border-radius: 999px;
  padding: 4px 12px;
  transition: border-color 0.15s, color 0.15s;
}
.lang:hover { color: var(--silver); border-color: var(--silver-dim); }

/* —— Hero(深夜底,承接图标身份) —— */
.hero {
  background:
    radial-gradient(
      900px 460px at 78% 18%,
      rgba(107, 97, 232, 0.22),
      transparent 62%
    ),
    radial-gradient(
      620px 380px at 10% 88%,
      rgba(31, 157, 128, 0.12),
      transparent 60%
    ),
    var(--night);
  color: var(--silver);
  padding: clamp(56px, 9vw, 104px) 0 clamp(64px, 10vw, 116px);
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(32px, 6vw, 64px);
  align-items: center;
}
.eyebrow {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--silver-dim);
  border: 1px solid rgba(174, 182, 200, 0.26);
  border-radius: 999px;
  padding: 5px 14px;
  margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(34px, 5.6vw, 58px);
  line-height: 1.18;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
  font-weight: 700;
}
.hero p.lede {
  font-size: clamp(16px, 2vw, 18.5px);
  color: var(--silver-dim);
  margin: 0 0 32px;
  max-width: 34em;
}
.cta-row { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  background: var(--violet);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 15.5px;
  padding: 13px 26px;
  border-radius: 999px;
  transition: transform 0.15s, box-shadow 0.15s;
  box-shadow: 0 8px 26px rgba(107, 97, 232, 0.32);
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 12px 32px rgba(107, 97, 232, 0.42); }
.btn svg { width: 18px; height: 18px; }
.cta-note { font-size: 13.5px; color: var(--silver-dim); }

/* Hero 视觉:双星几何(与 app 图标同一套几何) */
.stars { display: flex; justify-content: center; }
.stars svg { width: min(340px, 76vw); height: auto; }

/* —— 通用区块 —— */
section { padding: clamp(56px, 8vw, 96px) 0; }
.section-alt { background: var(--surface); }
.section-head { max-width: 34em; margin-bottom: clamp(32px, 5vw, 52px); }
.section-head h2 {
  font-size: clamp(25px, 3.6vw, 34px);
  line-height: 1.3;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
.section-head p { color: var(--ink-2); margin: 0; font-size: 16.5px; }

/* —— 四步流程 —— */
.steps { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.step {
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 26px 24px;
}
.section-alt .step { background: var(--card); }
.step-n {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: var(--violet-soft);
  color: var(--violet);
  font-weight: 700;
  font-size: 14.5px;
  margin-bottom: 14px;
}
.step h3 { margin: 0 0 8px; font-size: 17.5px; letter-spacing: -0.005em; }
.step p { margin: 0; color: var(--ink-2); font-size: 15px; }

/* —— 侧写示意(非截图,是结构示意) —— */
.showcase {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  align-items: start;
}
.panel {
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 24px;
}
.panel-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 16px;
}
.field { padding: 12px 0; border-bottom: 1px solid var(--hairline); }
.field:last-child { border-bottom: 0; padding-bottom: 0; }
.field-k { font-size: 13px; color: var(--teal); font-weight: 600; margin-bottom: 4px; }
.field-v { font-size: 15px; color: var(--ink); }
.evidence {
  display: inline-block;
  font-size: 12px;
  color: var(--ink-3);
  background: var(--surface);
  border-radius: 6px;
  padding: 2px 8px;
  margin-top: 7px;
}

/* —— 功能清单 —— */
.features { display: grid; gap: 14px 28px; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); }
.feat { display: flex; gap: 12px; align-items: flex-start; }
.feat-dot {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--violet);
  margin-top: 10px;
}
.feat p { margin: 0; font-size: 15.5px; }

/* —— 隐私 —— */
.privacy-card {
  background: var(--night);
  color: var(--silver);
  border-radius: 22px;
  padding: clamp(30px, 5vw, 48px);
}
.privacy-card h2 { margin: 0 0 14px; font-size: clamp(23px, 3.2vw, 30px); }
.privacy-card p { color: var(--silver-dim); margin: 0 0 20px; max-width: 46em; font-size: 16px; }
.privacy-list { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); margin-top: 26px; }
.privacy-item {
  border: 1px solid rgba(174, 182, 200, 0.2);
  border-radius: 12px;
  padding: 16px 18px;
}
.privacy-item strong { display: block; color: var(--silver); font-size: 15px; margin-bottom: 5px; font-weight: 600; }
.privacy-item span { font-size: 14px; color: var(--silver-dim); }

/* —— 结尾 CTA —— */
.final { text-align: center; }
.final h2 { font-size: clamp(26px, 4vw, 38px); margin: 0 0 14px; letter-spacing: -0.01em; }
.final p { color: var(--ink-2); margin: 0 0 30px; font-size: 17px; }
.final .cta-row { justify-content: center; }

/* —— FAQ 页 —— */
.page-head {
  background: var(--night);
  color: var(--silver);
  padding: clamp(44px, 7vw, 72px) 0;
}
.page-head h1 {
  font-size: clamp(28px, 4.4vw, 42px);
  line-height: 1.2;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
.page-head p { color: var(--silver-dim); margin: 0; max-width: 40em; font-size: 16.5px; }
.faq-list { max-width: 760px; display: grid; gap: 16px; }
.faq-item {
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 22px 26px;
}
.faq-item h2 { font-size: 18px; margin: 0 0 10px; letter-spacing: -0.005em; }
.faq-item p { margin: 0 0 10px; color: var(--ink-2); font-size: 15.5px; }
.faq-item p:last-child { margin-bottom: 0; }

/* —— 页脚 —— */
footer {
  background: var(--night);
  color: var(--silver-dim);
  padding: 44px 0 36px;
  font-size: 14px;
}
.foot-grid { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; align-items: flex-start; }
.foot-links { display: flex; gap: 22px; flex-wrap: wrap; }
.foot-links a { color: var(--silver-dim); text-decoration: none; }
.foot-links a:hover { color: var(--silver); text-decoration: underline; }
.foot-meta { color: #6f7789; font-size: 13px; line-height: 1.9; }
.foot-meta a { color: #6f7789; }

/* —— 响应式 —— */
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; text-align: left; }
  .stars { order: -1; margin-bottom: 8px; }
  .stars svg { width: min(220px, 56vw); }
}
@media (max-width: 560px) {
  .nav .wrap { min-height: 56px; gap: 12px; }
  .nav-links { gap: 14px; font-size: 13px; }
  .btn { width: 100%; justify-content: center; }
  .cta-row { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}