@charset "UTF-8";

:root {
  /* 蓝白搭配：近白底 + 真白浮层 + 天空蓝强调 + 炭黑正文 */
  --bg: #fafcff;
  --bg-elevated: #ffffff;
  --surface: #eef5fb;
  --ink: #1b2430;
  --muted: #66788a;
  --muted-2: #92a3b4;
  --line: #e2ecf5;
  --line-strong: #cddcec;
  --accent: #3e9fe0;
  --accent-deep: #2b7cb8;
  --accent-soft: rgba(62, 159, 224, 0.12);
  --page: min(94vw, 1180px);
  --ease: cubic-bezier(0.22, 0.8, 0.28, 1);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  color: var(--ink);
  background:
    radial-gradient(ellipse 70% 45% at 90% 0%, rgba(62, 159, 224, 0.09), transparent 55%),
    radial-gradient(ellipse 50% 35% at 0% 100%, rgba(238, 245, 251, 0.9), transparent 50%),
    var(--bg);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

::selection {
  color: #fff;
  background: var(--accent);
}

.scroll-progress {
  position: fixed;
  inset: 0 auto auto 0;
  z-index: 100;
  width: 100%;
  height: 2px;
  pointer-events: none;
}

.scroll-progress i {
  display: block;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left;
  background: var(--accent);
}

/* —— Topbar —— */
.topbar {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 14px clamp(16px, 3.5vw, 40px);
  background: rgba(250, 252, 255, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s, background 0.25s;
}

.topbar.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(250, 252, 255, 0.96);
}

.brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  color: inherit;
  text-decoration: none;
}

.brand__wordmark {
  font-family: var(--font-sans);
  font-size: 20px;
  font-weight: 650;
  letter-spacing: 0.04em;
  line-height: 1.1;
}

.nav {
  display: flex;
  gap: 22px;
  margin-left: auto;
}

.nav a {
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
  transition: color 0.2s;
}

.nav a:hover,
.nav a.is-active { color: var(--ink); }

.topbar__cta {
  padding: 7px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: border-color 0.2s, background 0.2s;
}

.topbar__cta:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* —— Shared —— */
.section {
  width: var(--page);
  margin: 0 auto;
  padding: clamp(44px, 6vw, 72px) 0;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-head {
  margin-bottom: 28px;
}

.section-head h2 {
  margin: 0;
  max-width: none;
  width: 100%;
  font-family: var(--font-serif);
  font-size: clamp(1.85rem, 3.4vw, 2.65rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.section-head__copy {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
  text-align: justify;
  text-justify: inter-ideograph;
}

.lead {
  margin: 0 0 16px;
  max-width: none;
  width: 100%;
  text-align: justify;
  text-justify: inter-ideograph;
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  font-weight: 500;
  line-height: 1.7;
  letter-spacing: -0.01em;
}

.body-copy {
  margin: 0;
  max-width: none;
  width: 100%;
  text-align: justify;
  text-justify: inter-ideograph;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.75;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 20px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  transition: transform 0.2s var(--ease), background 0.2s, border-color 0.2s;
}

.button:hover { transform: translateY(-1px); }

.button--primary {
  background: var(--ink);
  color: #fff;
}

.button--primary:hover { background: var(--accent-deep); }

.button--ghost {
  border: 1px solid var(--line-strong);
  background: transparent;
}

.button--ghost:hover { border-color: var(--ink); }

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}

.reveal.is-visible,
.render-mode .reveal {
  opacity: 1;
  transform: none;
}

/* —— Hero —— */
.hero {
  display: grid;
  grid-template-columns: 1.35fr 0.9fr;
  grid-template-areas:
    "main aside"
    "metrics metrics";
  gap: 22px 40px;
  min-height: auto;
  padding-top: 96px;
  padding-bottom: 40px;
}

.hero__main { grid-area: main; }

.hero__title {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 5.2vw, 3.85rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.hero__title span { display: inline; }
.hero__title span + span::before { content: ""; }
.hero__accent { color: var(--accent); }

.hero__lead {
  margin: 0 0 24px;
  max-width: none; width: 100%; text-align: justify; text-justify: inter-ideograph;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero__aside {
  grid-area: aside;
  padding: 24px;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(27, 36, 48, 0.04);
  align-self: start;
}

.hero__aside-label {
  margin: 0 0 10px;
  color: var(--muted-2);
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero__aside-copy {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.55;
}

.hero__aside-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.hero__aside-list div small {
  display: block;
  margin-bottom: 2px;
  color: var(--muted-2);
  font-size: 10px;
  letter-spacing: 0.06em;
}

.hero__aside-list div strong {
  font-size: 13px;
  font-weight: 600;
}

.hero__metrics {
  grid-area: metrics;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.metric {
  padding: 18px 20px;
  background: var(--bg-elevated);
}

.metric strong {
  display: block;
  margin-bottom: 4px;
  color: var(--accent);
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
}

.metric span {
  display: block;
  font-size: 13px;
  font-weight: 600;
}

.metric small {
  color: var(--muted);
  font-size: 12px;
}

/* —— Thesis —— */
.thesis-body {
  display: flex;
  flex-direction: column;
  gap: 22px;
  margin-bottom: 32px;
}

.thesis-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px 40px;
  align-items: stretch;
}

.thesis-col {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.thesis-col .lead,
.thesis-col .body-copy {
  margin: 0;
}

.thesis-col--bridge {
  padding-left: 28px;
  border-left: 1px solid var(--line);
}

.thesis-evolution {
  margin: 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.thesis-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.thesis-card {
  padding: 24px;
  background: var(--bg-elevated);
}

.thesis-card__no {
  display: block;
  margin-bottom: 14px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.08em;
}

.thesis-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
}

.thesis-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.65;
}

/* —— Market —— */
.market {
  width: 100%;
  max-width: none;
  padding-left: max(calc((100% - var(--page)) / 2), 3vw);
  padding-right: max(calc((100% - var(--page)) / 2), 3vw);
  background: transparent;
  border-block: 1px solid var(--line);
}

.market-top {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 28px;
  margin: 28px 0 36px;
}

.callouts {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.callout {
  flex: 1;
  padding: 22px 24px;
  background: transparent;
}

.callout small {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.06em;
}

.callout strong {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.segment-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  justify-content: center;
}

.segment__head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
  font-size: 13px;
}

.segment__head b { font-weight: 600; }
.segment__head span { color: var(--muted); }
.segment__desc {
  margin: 0 0 6px;
  color: var(--muted-2);
  font-size: 12px;
}

.segment__bar {
  height: 4px;
  background: var(--line);
  border-radius: 2px;
  overflow: hidden;
}

.segment__bar i {
  display: block;
  width: var(--bar, 50%);
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transform-origin: left;
  animation: barGrow 0.9s var(--ease) both;
}

@keyframes barGrow {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.missing-block h3 {
  margin: 0 0 16px;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
}

.missing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.missing-item {
  padding: 18px;
  background: transparent;
}

.missing-item span {
  display: block;
  margin-bottom: 8px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 650;
}

.missing-item h4 {
  margin: 0 0 6px;
  font-size: 14px;
  font-weight: 650;
}

.missing-item p {
  margin: 0;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.55;
}

/* —— Method —— */
.method-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin: 28px 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.method-step {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 14px;
  padding: 22px 24px;
  background: var(--bg-elevated);
}

.method-step__no {
  color: var(--accent);
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
}

.method-step h3 {
  margin: 0 0 2px;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
}

.method-step__en {
  display: block;
  margin-bottom: 8px;
  color: var(--muted-2);
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.12em;
}

.method-step p {
  margin: 0;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.65;
}

.method-bottom {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 20px;
}

.insight {
  margin: 0;
  padding: 24px;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 12px;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 500;
  line-height: 1.45;
}

.prose-stack {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.prose-stack > .lead,
.prose-stack > .body-copy,
.prose-stack > .team-closing {
  margin: 0;
}

.prose-stack > .insight {
  margin: 2px 0;
  font-size: clamp(1.02rem, 1.35vw, 1.12rem);
  line-height: 1.55;
}

.point-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.point-item {
  padding: 18px 22px;
  background: var(--bg-elevated);
}

.point-item h4 {
  margin: 0 0 6px;
  font-size: 14px;
  font-weight: 650;
}

.point-item p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

/* —— Figure —— */
.figure {
  margin: 28px 0;
  padding: 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 12px;
}

.figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 6px;
}

.figure figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.figure figcaption small {
  display: block;
  margin-top: 6px;
  color: var(--muted-2);
  font-size: 11.5px;
}

/* —— Future —— */
.future-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 28px;
}

.future-card {
  padding: 24px;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 12px;
}

.future-card__no {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 9px;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 11px;
  font-weight: 700;
}

.future-card h3 {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
}

.future-card ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.future-card li {
  position: relative;
  padding: 8px 0 8px 14px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.55;
}

.future-card li::before {
  content: "";
  position: absolute;
  top: 15px;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

/* —— Team —— */
.team-prose {
  gap: 20px;
}

.team-closing {
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 1.55vw, 1.18rem);
  font-weight: 500;
  line-height: 1.7;
  letter-spacing: -0.01em;
  text-align: justify;
  text-justify: inter-ideograph;
}

/* —— Closing —— */
.closing {
  text-align: center;
  padding-bottom: clamp(72px, 10vw, 110px);
  border-top: 1px solid var(--line);
}

.closing h2 {
  margin: 0 auto 16px;
  max-width: min(100%, 20em);
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 4.5vw, 3.4rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.03em;
  white-space: nowrap;
}

@media (max-width: 520px) {
  .closing h2 {
    white-space: normal;
    text-wrap: balance;
  }
}

.closing__copy {
  margin: 0 auto 28px;
  max-width: none;
  width: 100%;
  text-align: justify;
  text-justify: inter-ideograph;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.closing__meta {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 48px;
  color: var(--muted-2);
  font-size: 11px;
  letter-spacing: 0.1em;
}

/* —— Responsive —— */
@media (max-width: 980px) {
  .nav { display: none; }

  .hero {
    grid-template-columns: 1fr;
    grid-template-areas: "main" "aside" "metrics";
  }

  .thesis-split,
  .market-top,
  .method-bottom,
  .future-grid {
    grid-template-columns: 1fr;
  }

  .thesis-col--bridge {
    padding-left: 0;
    border-left: 0;
    padding-top: 18px;
    border-top: 1px solid var(--line);
  }

  .thesis-grid,
  .missing-grid {
    grid-template-columns: 1fr 1fr;
  }

  .method-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero__metrics {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .thesis-grid,
  .missing-grid,
  .method-grid,
  .hero__metrics {
    grid-template-columns: 1fr;
  }

  .hero__aside-list { grid-template-columns: 1fr 1fr; }

  .method-step { grid-template-columns: 36px 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .segment__bar i { animation: none; }
}