/* ============================================================
   脉高 mindGo · 下载页 v4
   与首页同一套 token：白底 × 黑色主按钮 × 墨绿点缀
   ============================================================ */

:root {
  --ink: #121513;
  --ink-soft: #5d635e;
  --ink-faint: #8b918c;
  --paper: #ffffff;
  --paper-soft: #f5f7f4;
  --paper-dark: #0a120e;
  --line: #e6e9e4;
  --line-dark: rgba(255, 255, 255, 0.12);
  --pine: #0f231b;
  --pine-mid: #2a5f47;
  --pine-strong: #1d4f39;
  --pine-light: #9ed3b6;
  --radius: 22px;
  --shadow-soft: 0 1px 2px rgba(18, 21, 19, 0.04), 0 12px 40px rgba(18, 21, 19, 0.07);
  --shadow-lift: 0 2px 4px rgba(18, 21, 19, 0.06), 0 20px 56px rgba(18, 21, 19, 0.12);
  --font-sans: 'Manrope', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'DM Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-serif: 'Songti SC', 'STSong', 'SimSun', serif;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { display: block; }

.wrap { width: calc(100% - 48px); max-width: 1120px; margin-inline: auto; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: #fff; padding: 10px 18px; border-radius: 999px; z-index: 100;
}
.skip-link:focus { left: 16px; top: 16px; }

/* ---------- 滚动进度条 ---------- */

.scroll-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px;
  background: var(--pine-mid);
  transform-origin: left; transform: scaleX(var(--sp, 0));
  z-index: 80; pointer-events: none;
}

/* ---------- 顶部导航 ---------- */

.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.82);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(18, 21, 19, 0.06);
}

.topbar-row { display: flex; align-items: center; gap: 28px; height: 72px; }

.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand img { border-radius: 8px; }
.brand-name { font-size: 17px; font-weight: 600; letter-spacing: 0.02em; }
.brand-name b { font-weight: 800; }

.topbar nav { display: flex; gap: 26px; margin-left: auto; }
.topbar nav a { color: var(--ink-soft); text-decoration: none; font-size: 14.5px; transition: color 0.2s; }
.topbar nav a:hover { color: var(--ink); }
.topbar nav + .button { margin-left: -6px; }

/* ---------- 按钮 ---------- */

.button {
  position: relative; overflow: hidden;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--ink); color: #fff;
  border-radius: 999px; padding: 13px 28px;
  font-size: 15.5px; font-weight: 700; letter-spacing: 0.02em;
  text-decoration: none; border: 0; cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  box-shadow: 0 8px 24px rgba(18, 21, 19, 0.18);
}
.button::after {
  content: ""; position: absolute; top: -20%; bottom: -20%; left: -70%;
  width: 45%; transform: skewX(-22deg);
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.32), transparent);
  transition: left 0.55s ease; pointer-events: none;
}
.button:hover::after { left: 135%; }
.button:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(18, 21, 19, 0.28); }
.button.small { padding: 9px 20px; font-size: 14px; }

/* ---------- 标题体系 ---------- */

h1 {
  font-size: clamp(40px, 6.4vw, 74px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
h2 {
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
h1 em, h2 em {
  font-family: var(--font-serif);
  font-style: normal;
  font-weight: 900;
  color: var(--pine-strong);
}

.section { padding: 100px 0; }
.section-soft { background: var(--paper-soft); }
.section h2, .closing { text-align: center; }

.section-kicker {
  margin-bottom: 18px;
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.16em;
  color: var(--pine-mid); text-align: center;
}
.section-sub { margin: 18px auto 0; text-align: center; color: var(--ink-soft); font-size: 16.5px; max-width: 760px; }

/* ---------- 首屏 ---------- */

.hero { position: relative; padding: 88px 0 96px; text-align: center; }

.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(15, 35, 27, 0.13) 1px, transparent 1.5px);
  background-size: 26px 26px;
  -webkit-mask-image: radial-gradient(ellipse 72% 58% at 50% 6%, #000 25%, transparent 72%);
  mask-image: radial-gradient(ellipse 72% 58% at 50% 6%, #000 25%, transparent 72%);
  pointer-events: none;
}

.aurora { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.aurora i { position: absolute; border-radius: 50%; filter: blur(64px); will-change: transform; }
.aurora i:nth-child(1) {
  width: 520px; height: 520px; left: 6%; top: -230px;
  background: radial-gradient(circle, rgba(88, 158, 124, 0.26), transparent 66%);
  animation: drift-a 18s ease-in-out infinite;
}
.aurora i:nth-child(2) {
  width: 600px; height: 600px; right: 2%; top: -190px;
  background: radial-gradient(circle, rgba(158, 211, 182, 0.3), transparent 66%);
  animation: drift-b 24s ease-in-out infinite;
}
.aurora i:nth-child(3) {
  width: 440px; height: 440px; left: 40%; top: 34%;
  background: radial-gradient(circle, rgba(58, 125, 95, 0.14), transparent 66%);
  animation: drift-c 30s ease-in-out infinite;
}
@keyframes drift-a {
  0%, 100% { transform: translate(0, 0) scale(1); }
  30% { transform: translate(150px, 60px) scale(1.14); }
  65% { transform: translate(50px, 160px) scale(1.04); }
}
@keyframes drift-b {
  0%, 100% { transform: translate(0, 0) scale(1); }
  35% { transform: translate(-160px, 100px) scale(1.1); }
  70% { transform: translate(-70px, 190px) scale(1.02); }
}
@keyframes drift-c {
  0%, 100% { transform: translate(0, 0) scale(1); }
  40% { transform: translate(130px, -90px) scale(1.16); }
  75% { transform: translate(-80px, -50px) scale(1.03); }
}

.hero .wrap { position: relative; z-index: 1; }

@keyframes rise {
  from { opacity: 0; transform: translateY(24px); filter: blur(5px); }
  to { opacity: 1; transform: none; filter: blur(0); }
}
.hero-eyebrow { animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) 0.05s backwards; }
.hero h1 { animation: rise 0.8s cubic-bezier(0.2, 0.7, 0.2, 1) 0.12s backwards; }
.hero-sub { animation: rise 0.75s cubic-bezier(0.2, 0.7, 0.2, 1) 0.2s backwards; }
.dl-actions { animation: rise 0.8s cubic-bezier(0.2, 0.7, 0.2, 1) 0.28s backwards; }
.dl-meta, .hero-note, .download-note { animation: rise 0.75s cubic-bezier(0.2, 0.7, 0.2, 1) 0.34s backwards; }

.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em;
  color: var(--ink-faint);
  margin-bottom: 22px;
}
.pulse-dot {
  width: 7px; height: 7px; border-radius: 999px; background: var(--pine-mid); flex: none;
  animation: indicator-pulse 1.8s ease-out infinite;
}
@keyframes indicator-pulse {
  0% { box-shadow: 0 0 0 0 rgba(42, 95, 71, 0.4); }
  100% { box-shadow: 0 0 0 8px rgba(42, 95, 71, 0); }
}

.hero-sub { margin: 24px auto 0; max-width: 720px; color: var(--ink-soft); font-size: clamp(16px, 2vw, 17.5px); }

/* ---------- 平台选择 + 主下载按钮 ---------- */

.dl-actions {
  margin: 40px auto 0;
  width: min(440px, 100%);
  display: grid; gap: 14px;
}

.dl-switch {
  justify-self: center;
  display: inline-flex; gap: 4px;
  padding: 4px;
  border: 1px solid var(--line); border-radius: 999px;
  background: var(--paper-soft);
}
.dl-switch button {
  display: inline-flex; align-items: center; gap: 7px;
  border: 0; border-radius: 999px; background: transparent;
  padding: 8px 18px;
  font-family: inherit; font-size: 13.5px; font-weight: 650; color: var(--ink-soft);
  cursor: pointer; transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}
.dl-switch button svg { width: 15px; height: 15px; }
.dl-switch button:hover { color: var(--ink); }
.dl-switch button[aria-pressed="true"] {
  background: var(--paper); color: var(--ink);
  box-shadow: 0 1px 2px rgba(18, 21, 19, 0.06), 0 4px 14px rgba(18, 21, 19, 0.06);
}

.dl-button {
  position: relative; overflow: hidden;
  display: flex; align-items: center; gap: 14px;
  width: 100%; padding: 16px 22px;
  background: var(--ink); color: #fff;
  border-radius: 18px; text-decoration: none;
  box-shadow: 0 8px 24px rgba(18, 21, 19, 0.18);
  transition: transform 0.25s ease, box-shadow 0.25s ease, opacity 0.25s ease;
}
.dl-button::after {
  content: ""; position: absolute; top: -20%; bottom: -20%; left: -70%;
  width: 42%; transform: skewX(-22deg);
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.26), transparent);
  transition: left 0.55s ease; pointer-events: none;
}
.dl-button:hover { transform: translateY(-2px); box-shadow: 0 14px 36px rgba(18, 21, 19, 0.26); }
.dl-button:hover::after { left: 135%; }
.dl-button[aria-disabled="true"] { opacity: 0.55; cursor: default; transform: none; box-shadow: none; }
.dl-button[aria-disabled="true"]::after { display: none; }
.dl-button svg { width: 20px; height: 20px; flex: none; }
.dl-button[data-platform="macos"] .icon-windows,
.dl-button[data-platform="windows"] .icon-macos { display: none; }
.dl-text { display: flex; flex-direction: column; text-align: left; min-width: 0; }
.dl-text b { font-size: 16px; font-weight: 750; letter-spacing: 0.01em; }
.dl-text small { font-size: 12px; color: rgba(255, 255, 255, 0.62); font-family: var(--font-mono); letter-spacing: 0.04em; }
.dl-arrow {
  margin-left: auto; flex: none;
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.34);
  font-size: 15px;
}

.dl-meta { margin-top: 16px; font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.06em; color: var(--ink-soft); }
.hero-note { margin-top: 10px; font-size: 13px; color: var(--ink-faint); }
.download-note { margin-top: 14px; font-size: 13.5px; color: var(--ink-faint); min-height: 1.7em; }
.download-note a { color: var(--pine-mid); text-decoration: none; border-bottom: 1px solid rgba(42, 95, 71, 0.3); }
.download-note a:hover { color: var(--ink); border-bottom-color: var(--ink); }

/* ---------- 01 三步（目录行） ---------- */

.step-index {
  margin-top: 48px;
  list-style: none;
  border-top: 1px solid var(--line);
  text-align: left;
}
.step-row {
  position: relative;
  display: grid; grid-template-columns: 320px minmax(0, 1fr); gap: 10px 28px;
  align-items: start;
  padding: 28px 20px;
  border-bottom: 1px solid var(--line);
  border-radius: 16px;
  transition: background 0.25s ease;
}
.step-row::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  background: radial-gradient(360px circle at var(--mx, 50%) var(--my, 50%), rgba(42, 95, 71, 0.08), transparent 62%);
  opacity: 0; transition: opacity 0.35s ease;
}
.step-row:hover { background: var(--paper); }
.step-row:hover::after { opacity: 1; }
.step-row h3 { display: flex; align-items: baseline; gap: 12px; font-size: 18px; font-weight: 800; line-height: 1.5; }
.step-num { font-family: var(--font-mono); font-size: 11.5px; font-weight: 500; letter-spacing: 0.1em; color: var(--pine-mid); }
.step-row p { font-size: 14.5px; color: var(--ink-soft); line-height: 1.75; }
.step-row p a { color: var(--pine-mid); text-decoration: none; border-bottom: 1px solid rgba(42, 95, 71, 0.3); white-space: nowrap; }
.step-row p a:hover { color: var(--ink); border-bottom-color: var(--ink); }

.scene-link-group {
  margin-top: 28px;
  display: grid;
  gap: 12px;
}
.scene-link-group .scene-link {
  margin-top: 0;
}

.scene-link {
  position: relative; overflow: hidden;
  display: flex; align-items: center; gap: 16px;
  margin-top: 28px; padding: 18px 22px;
  border: 1px solid var(--line); border-radius: 16px;
  background: var(--paper);
  text-decoration: none; color: var(--ink);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.scene-link:hover { transform: translateY(-2px); box-shadow: var(--shadow-soft); }
.scene-link-main { font-size: 14.5px; font-weight: 750; flex: none; }
.scene-link-items { font-size: 13px; color: var(--ink-faint); min-width: 0; }
.scene-arrow { margin-left: auto; color: var(--pine-mid); font-size: 15px; flex: none; transition: transform 0.25s ease; }
.scene-link:hover .scene-arrow { transform: translateX(4px); }

/* ---------- 02 第一次能交付什么 ---------- */

.first-cards {
  margin-top: 52px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
  text-align: left;
}
.first-card {
  display: flex; flex-direction: column;
  background: var(--paper);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 24px;
  box-shadow: var(--shadow-soft);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.first-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); }
.first-card-key {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.14em; color: var(--ink-faint);
}
.first-card-say {
  margin-top: 10px; margin-bottom: 20px;
  font-size: 14.5px; font-weight: 650; line-height: 1.7; color: var(--ink);
}
.deliver-label {
  display: block; margin-bottom: 10px;
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.14em; color: var(--pine-mid);
}
.deliver-files { list-style: none; display: grid; gap: 9px; margin-top: auto; }
.deliver-files li {
  display: flex; align-items: flex-start; gap: 9px;
  font-size: 13.5px; line-height: 1.6; color: var(--ink-soft);
}
.ftype {
  flex: none; margin-top: 1px;
  font-family: var(--font-mono); font-size: 9.5px; letter-spacing: 0.06em;
  color: var(--pine-strong);
  border: 1px solid rgba(42, 95, 71, 0.3); border-radius: 6px;
  padding: 1px 6px; background: var(--paper);
}

/* ---------- 03 系统要求 + 常见问题 ---------- */

.spec-faq {
  margin-top: 50px;
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 40px;
  text-align: left;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
  border: 1px solid var(--line); border-radius: 18px;
  overflow: hidden;
}
.spec-caption {
  text-align: left;
  padding: 16px 20px 14px;
  font-size: 13px; font-weight: 700; color: var(--ink);
}
.spec-table th, .spec-table td {
  padding: 14px 20px;
  border-top: 1px solid var(--line);
  vertical-align: top;
  text-align: left;
}
.spec-table th {
  width: 96px;
  font-family: var(--font-sans); font-size: 12.5px; font-weight: 650; letter-spacing: 0.02em;
  color: var(--ink-soft);
  white-space: nowrap;
}
.spec-table td { font-size: 13.5px; color: var(--ink-soft); line-height: 1.7; }
.spec-note { margin-top: 14px; font-size: 12.5px; color: var(--ink-faint); line-height: 1.7; }
.spec-note a { color: var(--pine-mid); }

.faq-list { display: grid; gap: 4px; }
.faq-item { padding: 22px 0; border-top: 1px solid var(--line); }
.faq-item:last-child { border-bottom: 1px solid var(--line); }
.faq-item h3 { font-size: 15.5px; font-weight: 750; line-height: 1.6; }
.faq-item p { margin-top: 8px; font-size: 13.5px; color: var(--ink-soft); line-height: 1.75; }
.faq-item p a { color: var(--pine-mid); text-decoration: none; border-bottom: 1px solid rgba(42, 95, 71, 0.3); }

/* ---------- 收尾 ---------- */

.closing { padding: 104px 0 108px; text-align: center; }
.closing p { margin: 20px auto 0; max-width: 540px; color: var(--ink-soft); font-size: 16px; }
.closing-link {
  display: inline-flex; align-items: center; gap: 8px;
  margin-top: 30px;
  color: var(--ink); font-size: 15px; font-weight: 750; text-decoration: none;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 3px;
}
.closing-link span { color: var(--pine-mid); transition: transform 0.25s ease; }
.closing-link:hover span { transform: translateY(-3px); }
.closing-link:hover { color: var(--pine-strong); border-bottom-color: var(--pine-strong); }
.closing-note { margin-top: 18px !important; font-size: 13px !important; color: var(--ink-faint) !important; }

/* ---------- 页脚 ---------- */

.site-footer { background: var(--paper-dark); color: rgba(255, 255, 255, 0.86); }
.footer-grid {
  display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 40px;
  padding: 64px 0 48px;
}
.footer-brand img { border-radius: 9px; }
.footer-slogan { margin-top: 16px; font-size: 19px; font-weight: 700; line-height: 1.5; color: #fff; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-head { font-size: 13px; letter-spacing: 0.1em; color: rgba(255, 255, 255, 0.45); margin-bottom: 6px; }
.footer-col a { color: rgba(255, 255, 255, 0.82); text-decoration: none; font-size: 14.5px; transition: color 0.2s; }
.footer-col a:hover { color: #fff; }
.footer-base {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 22px 0 26px;
  border-top: 1px solid var(--line-dark);
  font-size: 12.5px; color: rgba(255, 255, 255, 0.45);
}
.to-top { color: rgba(255, 255, 255, 0.6); text-decoration: none; }
.to-top:hover { color: #fff; }

/* ---------- 进场动效 ---------- */

.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s ease, transform 0.7s ease; transition-delay: var(--d, 0s); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */

@media (max-width: 1000px) {
  .topbar nav { display: none; }
  .topbar .button.small { margin-left: auto; }
  .section { padding: 76px 0; }
  .step-row { grid-template-columns: 240px minmax(0, 1fr); }
  .first-cards { grid-template-columns: 1fr; max-width: 560px; margin-inline: auto; }
  .spec-faq { grid-template-columns: 1fr; gap: 34px; }
}

@media (max-width: 720px) {
  .wrap { width: calc(100% - 40px); }
  .topbar-row { height: 64px; gap: 16px; }
  html { scroll-padding-top: 76px; }
  .section { padding: 68px 0; }
  .hero { padding: 68px 0 76px; }
  .wide-break { display: none; }
  .dl-actions { width: 100%; margin-top: 32px; }
  .step-row { grid-template-columns: minmax(0, 1fr); gap: 10px; padding: 24px 12px; }
  .step-row p { font-size: 14px; }
  .scene-link { flex-direction: column; align-items: flex-start; gap: 6px; }
  .scene-arrow { display: none; }
  .first-card { padding: 24px 20px; }
  .spec-table th { width: 78px; }
  .spec-table th, .spec-table td { padding: 12px 14px; }
  .closing { padding: 78px 0 84px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 390px) {
  .wrap { width: calc(100% - 32px); }
  h1 { font-size: 34px; line-height: 1.2; }
  h2 { font-size: 27px; }
  .hero-eyebrow { font-size: 10.5px; letter-spacing: 0.06em; }
  .section-kicker { font-size: 11px; letter-spacing: 0.1em; }
  .dl-switch button { padding: 8px 14px; font-size: 13px; }
  .dl-button { padding: 14px 16px; gap: 10px; }
  .dl-text b { font-size: 15px; }
  .dl-text small { font-size: 11px; }
  .dl-arrow { display: none; }
  .closing-link { font-size: 14px; }
}