/* ============================================================
   星火创投 · Spark Ventures — 设计系统 v3（暗色主题）
   居中版式 ｜ 思源宋体标题 · 思源黑体正文 · Cormorant 英文衬线
   暖黑底 / 米白字 / 香槟金唯一强调色 ｜ 手机端优先
   ============================================================ */

:root {
  /* 色彩 */
  --bg: #131210;
  --card: #1B1A16;
  --ink: #F0EDE3;
  --ink-soft: #ABA799;
  --ink-faint: #7A776B;
  --hairline: rgba(240, 237, 227, 0.13);
  --accent: #C9A96A;
  --accent-deep: #A98643;
  --accent-soft: rgba(201, 169, 106, 0.14);
  --dark: #0D0C0A;
  --gold: #C9A96A;
  --gold-deep: #A98643;
  --band: #F0EDE3;           /* 收尾 CTA 反转亮区块 */
  --band-ink: #191917;
  --band-soft: #5B5B52;

  /* 字体 */
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --en-serif: "Cormorant Garamond", Georgia, "Times New Roman", "Noto Serif SC", serif;

  /* 几何 */
  --measure: 720px;
  --radius: 16px;
  --pill: 999px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 32px rgba(0, 0, 0, 0.3);
  --shadow-btn: 0 14px 34px rgba(201, 169, 106, 0.22);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.015em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--accent); color: #131210; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
h1, h2, h3 { text-wrap: balance; }

.wrap { max-width: var(--measure); margin: 0 auto; padding: 0 28px; }

/* 不换行工具类：金额区间等禁止拆行 */
.nb { white-space: nowrap; }

/* ============ 顶栏 ============ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  background: rgba(19, 18, 16, 0.82);
  -webkit-backdrop-filter: saturate(1.4) blur(16px);
  backdrop-filter: saturate(1.4) blur(16px);
  border-bottom: 1px solid var(--hairline);
}
.nav-inner {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 13px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: flex; flex-direction: column; line-height: 1.3; }
.wordmark {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.1em;
}
.wordmark em { font-style: normal; color: var(--accent); }
.wordmark .new-tag {
  font-family: var(--en-serif);
  font-style: italic;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  margin-left: 7px;
  letter-spacing: 0.04em;
}
.brand-en {
  font-family: var(--en-serif);
  font-style: italic;
  font-size: 10.5px;
  letter-spacing: 0.32em;
  color: var(--ink-faint);
}
.nav-cta {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  border: 1.5px solid var(--accent-deep);
  border-radius: var(--pill);
  padding: 7px 18px;
  transition: background 0.18s var(--ease), color 0.18s, transform 0.15s var(--ease);
}
.nav-cta:hover { background: var(--accent); color: #131210; }
.nav-cta:active { transform: scale(0.96); }

/* ============ 首屏（居中） ============ */
.hero {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 130px 28px 60px;
}
.hero .inner { max-width: var(--measure); }

.eyebrow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  font-family: var(--en-serif);
  font-style: italic;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.32em;
  text-indent: 0.32em;
  color: var(--ink-faint);
  margin-bottom: 34px;
}
.eyebrow::before, .eyebrow::after {
  content: "";
  width: 44px;
  height: 1px;
  background: var(--hairline);
}
.dm {
  display: inline-block;
  width: 5px; height: 5px;
  background: var(--accent);
  transform: rotate(45deg);
}

.hero h1 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(44px, 11.5vw, 82px);
  line-height: 1.22;
  letter-spacing: 0.02em;
}
.hero h1 .accent { color: var(--accent); }

.hero-sub {
  margin-top: 30px;
  font-size: 16.5px;
  color: var(--ink-soft);
  max-width: 32em;
  margin-left: auto;
  margin-right: auto;
}
.hero-sub strong { color: var(--ink); font-weight: 600; }
.hero-sub .lead { display: block; margin-bottom: 12px; }
.hero-sub .tail { display: block; color: var(--ink-faint); font-size: 14.5px; letter-spacing: 0.05em; }

.hero-cta { margin-top: 42px; max-width: 430px; margin-left: auto; margin-right: auto; }
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 24px;
}
.badge {
  font-size: 13px;
  color: var(--ink-soft);
  border: 1px solid var(--hairline);
  border-radius: var(--pill);
  padding: 6px 16px;
  background: var(--card);
}
.badge b { color: var(--accent); font-weight: 600; }
.scroll-hint {
  margin-top: 68px;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--ink-faint);
  animation: hintFloat 2.4s ease-in-out infinite;
}
@keyframes hintFloat {
  0%, 100% { transform: translateY(0); opacity: 0.7; }
  50% { transform: translateY(6px); opacity: 1; }
}

/* ============ 按钮 ============ */
.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  min-height: 58px;
  padding: 16px 30px;
  border-radius: var(--pill);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.05em;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: transform 0.15s var(--ease), background 0.2s, box-shadow 0.2s, color 0.2s, border-color 0.2s;
}
.btn-primary {
  background: var(--accent);
  color: #17150F;
  box-shadow: var(--shadow-btn);
}
.btn-primary:hover { background: var(--accent-deep); color: #F5F2E9; box-shadow: 0 16px 38px rgba(201, 169, 106, 0.3); }
.btn-primary:active { transform: scale(0.98); }
.btn-primary:disabled { opacity: 0.6; cursor: default; }
.btn-ghost {
  background: transparent;
  border-color: var(--hairline);
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--ink-faint); }
.btn .arrow { transition: transform 0.18s var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }

/* ============ 通用章节（居中） ============ */
.section { padding: 92px 0 0; }
.sec-head { text-align: center; max-width: 560px; margin: 0 auto 52px; }
.sec-num {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-family: var(--en-serif);
  font-style: italic;
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  margin-bottom: 14px;
}
.sec-num::before, .sec-num::after {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: 0.4;
}
.sec-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(27px, 6vw, 38px);
  line-height: 1.42;
  letter-spacing: 0.02em;
}

/* 01 三大顾虑（居中行式） */
.concern {
  text-align: center;
  border-top: 1px solid var(--hairline);
  padding: 44px 0;
}
.concern:last-of-type { border-bottom: 1px solid var(--hairline); }
.concern .q {
  font-family: var(--serif);
  font-size: clamp(24px, 5.4vw, 32px);
  font-weight: 700;
  line-height: 1.4;
}
.concern .q .mark { color: var(--accent); }
.concern .a {
  margin: 14px auto 0;
  color: var(--ink-soft);
  max-width: 27em;
  font-size: 15.5px;
}
.concern .a strong { color: var(--ink); }
.concern-note {
  margin-top: 48px;
  text-align: center;
  font-family: var(--serif);
  font-size: clamp(20px, 4.6vw, 26px);
  font-weight: 700;
  line-height: 1.6;
}
.concern-note .mark { color: var(--accent); }

/* 02 我是谁（居中） */
.about { text-align: center; max-width: 30em; margin: 0 auto; }
.monogram {
  width: 92px;
  height: 92px;
  border-radius: 50%;
  border: 1.5px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-size: 38px;
  font-weight: 700;
  color: var(--accent);
  background: var(--card);
  margin: 0 auto 26px;
  box-shadow: var(--shadow-card);
}
.about p { color: var(--ink-soft); }
.about p strong { color: var(--ink); }

/* 03 我投谁（卡片） */
.invest-grid { display: grid; gap: 14px; }
.invest-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s var(--ease), box-shadow 0.2s, border-color 0.2s;
}
.invest-item:hover { transform: translateY(-2px); box-shadow: 0 2px 4px rgba(0,0,0,.25), 0 18px 40px rgba(0,0,0,.35); border-color: rgba(201, 169, 106, 0.35); }
.invest-item .sign {
  flex: none;
  font-weight: 700;
  font-size: 14px;
  width: 27px;
  height: 27px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 4px;
}
.invest-item.yes .sign { background: var(--accent-soft); color: var(--accent); }
.invest-item.no .sign { background: rgba(240, 237, 227, 0.08); color: var(--ink-faint); }
.invest-item.no { opacity: 0.8; }
.invest-item .txt b { display: block; font-weight: 600; font-size: 16px; }
.invest-item .txt span { font-size: 14px; color: var(--ink-soft); }

/* 04 流程（居中步骤） */
.flow { display: grid; gap: 0; }
.flow-step {
  text-align: center;
  padding: 34px 0;
  border-top: 1px solid var(--hairline);
}
.flow-step:last-child { border-bottom: 1px solid var(--hairline); }
.flow-num {
  display: block;
  font-family: var(--en-serif);
  font-style: italic;
  font-size: 34px;
  font-weight: 500;
  color: var(--accent);
  line-height: 1.1;
  margin-bottom: 10px;
}
.flow-step b { display: block; font-weight: 600; font-size: 17.5px; }
.flow-step span { color: var(--ink-soft); font-size: 14.5px; }

/* 05 数字条（墨黑金字卡片 · 金边框） */
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  background: var(--dark);
  border: 1px solid rgba(201, 169, 106, 0.3);
  border-radius: var(--radius);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  overflow: hidden;
}
.stat { text-align: center; padding: 40px 8px; }
.stat + .stat { border-left: 1px solid rgba(240, 237, 227, 0.12); }
.stat .num {
  font-family: var(--serif);
  font-size: clamp(28px, 6.8vw, 42px);
  font-weight: 700;
  line-height: 1.25;
  white-space: nowrap;
  color: var(--gold);
}
.stat .num .accent { color: var(--gold); font-size: 0.62em; opacity: 0.9; }
.stat .lbl { font-size: 13px; color: rgba(240, 237, 227, 0.55); margin-top: 8px; letter-spacing: 0.1em; }

/* 06 FAQ */
.faq details { border-bottom: 1px solid var(--hairline); }
.faq details:first-of-type { border-top: 1px solid var(--hairline); }
.faq summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 24px 0;
  font-weight: 600;
  font-size: 16.5px;
  transition: color 0.15s;
}
.faq summary:hover { color: var(--accent); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary .plus {
  flex: none;
  width: 22px;
  height: 22px;
  border: 1.5px solid var(--ink-faint);
  border-radius: 50%;
  position: relative;
  transition: transform 0.22s var(--ease), border-color 0.2s;
}
.faq summary .plus::before,
.faq summary .plus::after {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 10px; height: 1.5px;
  background: var(--ink-soft);
  transform: translate(-50%, -50%);
}
.faq summary .plus::after { transform: translate(-50%, -50%) rotate(90deg); transition: transform 0.22s var(--ease); }
.faq details[open] .plus { border-color: var(--accent); transform: rotate(45deg); }
.faq details[open] .plus::before,
.faq details[open] .plus::after { background: var(--accent); }
.faq details p { padding: 0 0 26px; color: var(--ink-soft); max-width: 30em; }
.faq details p strong { color: var(--ink); }

/* ============ 收尾 CTA（米白反转区块 · 金色点缀） ============ */
.cta-band { background: var(--band); color: var(--band-ink); margin-top: 100px; }
.cta-band .wrap { padding-top: 104px; padding-bottom: 104px; text-align: center; }
.cta-band .sec-num { color: var(--gold-deep); }
.cta-band h2 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(30px, 7vw, 46px);
  line-height: 1.4;
  letter-spacing: 0.02em;
  max-width: 14em;
  margin: 0 auto;
}
.cta-band h2 .accent { color: var(--gold-deep); }
.cta-band p { margin: 20px auto 0; color: var(--band-soft); max-width: 26em; }
.cta-band .hero-cta { margin-top: 40px; }
.cta-band .hero-badges { margin-top: 22px; }
.cta-band .badge {
  background: transparent;
  border-color: rgba(25, 25, 23, 0.2);
  color: var(--band-soft);
}
.cta-band .badge b { color: var(--gold-deep); }

/* ============ 页脚（居中） ============ */
footer.site { padding: 64px 0 52px; text-align: center; }
.foot-brand {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.1em;
}
.foot-brand-en {
  font-family: var(--en-serif);
  font-style: italic;
  font-size: 11px;
  letter-spacing: 0.32em;
  color: var(--ink-faint);
  margin-top: 4px;
}
.foot-contact { color: var(--ink-soft); font-size: 14.5px; margin: 20px 0 0; }
.foot-contact b { color: var(--ink); font-weight: 600; }
.foot-legal {
  border-top: 1px solid var(--hairline);
  margin-top: 30px;
  padding-top: 26px;
  font-size: 12.5px;
  line-height: 2;
  color: var(--ink-faint);
  max-width: 38em;
  margin-left: auto;
  margin-right: auto;
}
.foot-legal p + p { margin-top: 8px; }

/* ============ 滚动渐现 ============ */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}
.reveal.in { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .scroll-hint { animation: none; }
}

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .flow { grid-template-columns: repeat(4, 1fr); gap: 0 40px; }
  .flow-step { border-top: 1px solid var(--hairline); padding: 40px 0; }
  .flow-step:first-child { border-left: none; }
  .flow-step:last-child { border-bottom: 1px solid var(--hairline); }
  .section { padding-top: 116px; }
}

@media (max-width: 380px) {
  .hero-badges { gap: 8px; }
}

/* ============ 手机端：眉标缩短（英文仅在宽屏显示） ============ */
@media (max-width: 520px) {
  .eyebrow .en { display: none; }
  .eyebrow { letter-spacing: 0.24em; font-size: 14px; margin-bottom: 28px; }
}

/* ============ 已投项目轮播（Swiper · 匀速无缝） ============ */
.sc-swiper {
  overflow: hidden;
  max-width: 760px;   /* 电脑端轮播带居中显示 */
  margin: 0 auto;
  padding: 6px 28px 20px;
  cursor: grab;
}
.sc-swiper:active { cursor: grabbing; }
.sc-swiper .swiper-slide { width: 198px; }
/* 匀速轮播的关键：过渡曲线改为线性 */
.sc-swiper .swiper-wrapper { transition-timing-function: linear !important; }
.sc-card {
  flex: none;
  width: 198px;
  scroll-snap-align: start;
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 24px 22px;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s var(--ease), box-shadow 0.2s, border-color 0.2s;
}
.sc-card:hover { transform: translateY(-3px); box-shadow: 0 2px 4px rgba(0,0,0,.25), 0 18px 40px rgba(0,0,0,.4); border-color: rgba(201, 169, 106, 0.35); }
.sc-name {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 18.5px;
  letter-spacing: 0.02em;
}
.sc-desc { font-size: 13.5px; color: var(--ink-soft); margin-top: 8px; line-height: 1.7; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sc-amt { margin-top: 16px; font-size: 12.5px; color: var(--ink-faint); letter-spacing: 0.04em; }
.sc-amt b { color: var(--gold); font-size: 17px; font-family: var(--serif); font-weight: 700; margin-left: 4px; }
.sc-nav { display: flex; justify-content: center; gap: 14px; margin-top: 4px; }
.sc-btn {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1.5px solid var(--hairline);
  background: var(--card);
  cursor: pointer;
  font-size: 16px;
  color: var(--ink-soft);
  transition: border-color 0.16s, color 0.16s, transform 0.15s var(--ease);
}
.sc-btn:hover { border-color: var(--accent); color: var(--accent); }
.sc-btn:active { transform: scale(0.94); }
.sc-note { text-align: center; font-size: 12px; color: var(--ink-faint); margin-top: 18px; letter-spacing: 0.04em; }

/* ============ 二维码联系页 ============ */
.qr-page {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 110px 28px 64px;
}
.qr-page h1 {
  font-family: var(--serif);
  font-size: clamp(32px, 7.6vw, 52px);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.02em;
}
.qr-page h1 .accent { color: var(--gold); }
.qr-sub { margin: 18px auto 0; color: var(--ink-soft); max-width: 26em; }
.qr-card {
  margin-top: 44px;
  background: var(--card);
  border: 1px solid rgba(201, 169, 106, 0.3);
  border-radius: 22px;
  padding: 34px 16px 28px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  max-width: 400px;
  width: 100%;
}
/* 双二维码并排：加大间距 + 中间发丝分隔线 */
.qr-row { display: flex; justify-content: center; gap: 34px; position: relative; }
.qr-row::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 6%;
  bottom: 6%;
  width: 1px;
  background: var(--hairline);
}
.qr-row .qr-frame {
  flex: 1;
  width: auto;
  height: auto;
  aspect-ratio: 1 / 1;
  max-width: 180px;
  margin: 0;
}
.qr-frame {
  width: 224px;
  height: 224px;
  margin: 0 auto;
  padding: 12px;
  border: 1.5px solid var(--hairline);
  border-radius: 16px;
  background: #fff;   /* 二维码需白底才可扫 */
}
.qr-frame img { width: 100%; height: 100%; object-fit: contain; display: block; }
.qr-tip { margin-top: 18px; font-size: 14px; color: var(--ink-soft); }
.qr-tip b { color: var(--gold); }
.qr-id {
  margin-top: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 15px;
  color: var(--ink-soft);
}
.qr-id b {
  font-size: 16px;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.copy-btn {
  border: 1px solid var(--hairline);
  background: var(--bg);
  border-radius: var(--pill);
  padding: 4px 14px;
  font-size: 13px;
  color: var(--ink-soft);
  cursor: pointer;
  transition: border-color 0.16s, color 0.16s;
}
.copy-btn:hover { border-color: var(--gold); color: var(--gold); }