:root {
  --white: #ffffff;
  --ink: #061225;
  --muted: #526071;
  --soft: #8793a3;
  --blue: #0057d8;
  --blue-deep: #003b95;
  --blue-dark: #071f55;
  --blue-soft: #edf4ff;
  --blue-wash: #f6faff;
  --blue-line: #c8daf7;
  --line: #e4ebf5;
  --panel: #f8fbff;
  --shadow-blue: 0 28px 80px rgba(0, 55, 140, 0.12);
  --max: 1180px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --z-sticky: 20;
  --z-toast: 30;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100dvh;
  color: var(--ink);
  background: var(--white);
  font-family: "Aptos", "Segoe UI", "Microsoft YaHei UI", "Microsoft YaHei", ui-sans-serif, system-ui, sans-serif;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(0, 87, 216, 0.045) 1px, transparent 1px),
    linear-gradient(180deg, rgba(0, 87, 216, 0.04) 1px, transparent 1px);
  background-size: 88px 88px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.45), transparent 64%);
}

button,
a {
  font: inherit;
}

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

button {
  border: 0;
  cursor: pointer;
}

:focus-visible {
  outline: 3px solid rgba(0, 87, 216, 0.28);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: 16px;
  z-index: var(--z-toast);
  padding: 10px 14px;
  background: var(--blue);
  color: var(--white);
  border-radius: var(--radius-sm);
  transform: translateY(-140%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  width: min(var(--max), calc(100vw - 40px));
  min-height: 76px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(228, 235, 245, 0.8);
}

.brand-mark {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
}

.brand-mark span {
  color: var(--blue);
  font-size: 1.15rem;
  font-weight: 850;
}

.site-nav,
.header-email {
  color: var(--muted);
  font-size: 0.94rem;
}

.site-nav {
  display: flex;
  justify-content: center;
  gap: 28px;
}

.site-nav a,
.header-email {
  transition: color 180ms ease, transform 180ms ease;
}

.site-nav a:hover,
.header-email:hover {
  color: var(--blue);
  transform: translateY(-1px);
}

.header-email {
  color: var(--blue-deep);
  font-weight: 700;
  overflow-wrap: anywhere;
}

.hero {
  min-height: calc(100dvh - 76px);
  display: flex;
  align-items: center;
  padding: clamp(52px, 8vw, 96px) 0 clamp(86px, 11vw, 136px);
}

.hero-inner,
.section-shell {
  width: min(var(--max), calc(100vw - 40px));
  margin: 0 auto;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.72fr);
  gap: clamp(42px, 7vw, 104px);
  align-items: center;
}

.role-line,
.section-kicker,
.case-type {
  margin: 0 0 18px;
  color: var(--blue);
  font-size: 0.95rem;
  font-weight: 760;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

h1 {
  max-width: 15ch;
  margin-bottom: 28px;
  font-size: clamp(3.3rem, 7.2vw, 6rem);
  line-height: 1.03;
  letter-spacing: 0;
  text-wrap: balance;
}

.hero-lede {
  max-width: 690px;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: clamp(1.06rem, 1.5vw, 1.24rem);
  line-height: 1.78;
  text-wrap: pretty;
}

.hero-actions,
.case-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
}

.primary-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  color: var(--white);
  background: var(--blue);
  border: 1px solid var(--blue);
  border-radius: var(--radius-sm);
  font-weight: 760;
  transition: transform 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

.primary-link:hover {
  transform: translateY(-2px);
  background: var(--blue-deep);
  box-shadow: 0 14px 34px rgba(0, 59, 149, 0.18);
}

.primary-link:active {
  transform: translateY(0) scale(0.98);
}

.text-link {
  color: var(--blue-deep);
  font-weight: 760;
  text-decoration: underline;
  text-decoration-color: var(--blue-line);
  text-underline-offset: 5px;
}

.contact-email {
  color: var(--blue-deep);
  font-weight: 800;
  overflow-wrap: anywhere;
}

.signal-board {
  position: relative;
  padding: clamp(24px, 4vw, 34px);
  color: var(--ink);
  border-radius: var(--radius-md);
  border: 1px solid var(--blue-line);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(237, 244, 255, 0.96)),
    var(--blue-wash);
  box-shadow: var(--shadow-blue);
  overflow: hidden;
}

.signal-board::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(0, 87, 216, 0.08) 1px, transparent 1px),
    linear-gradient(180deg, rgba(0, 87, 216, 0.07) 1px, transparent 1px);
  background-size: 34px 34px;
  opacity: 0.58;
}

.signal-head,
.signal-track {
  position: relative;
}

.signal-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 42px;
  color: var(--muted);
  font-size: 0.88rem;
}

.signal-track {
  display: grid;
  gap: 18px;
}

.signal-node {
  padding: 18px;
  border: 1px solid var(--blue-line);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.84);
  box-shadow: 0 12px 34px rgba(0, 55, 140, 0.06);
}

.signal-node span {
  display: block;
  margin-bottom: 18px;
  color: rgba(0, 59, 149, 0.62);
  font-variant-numeric: tabular-nums;
}

.signal-node strong {
  display: block;
  margin-bottom: 6px;
  font-size: 1.1rem;
}

.signal-node p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.signal-node.is-strong {
  border-color: var(--blue);
  background: var(--blue);
  color: var(--white);
}

.signal-node.is-strong p,
.signal-node.is-strong span {
  color: rgba(255, 255, 255, 0.82);
}

.section-shell {
  padding: clamp(82px, 10vw, 140px) 0;
}

.section-intro {
  max-width: 820px;
  margin-bottom: clamp(32px, 5vw, 58px);
}

.section-intro h2 {
  margin-bottom: 0;
  font-size: clamp(2.1rem, 4.6vw, 4.35rem);
  line-height: 1.08;
  letter-spacing: 0;
  text-wrap: balance;
}

.section-note {
  max-width: 720px;
  margin: 22px 0 0;
  color: var(--muted);
  line-height: 1.72;
}

.narrative-strip {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(320px, 1fr);
  gap: clamp(32px, 7vw, 88px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.strip-grid {
  display: grid;
  gap: 24px;
  align-content: center;
}

.strip-grid p {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 1.06rem;
  line-height: 1.82;
}

.education-stage {
  display: grid;
  gap: 0;
}

.education-row {
  display: grid;
  grid-template-columns: 80px minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  padding: 26px 0;
  border-top: 1px solid var(--line);
}

.education-row:last-child {
  border-bottom: 1px solid var(--line);
}

.education-index,
.case-step span {
  color: var(--blue);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
}

.education-row h3 {
  margin-bottom: 6px;
  font-size: clamp(1.35rem, 2vw, 1.8rem);
}

.education-row p,
.education-row time,
.panel-proof,
.evidence-item p,
.case-hook,
.case-step p,
.contact-marquee p {
  color: var(--muted);
  line-height: 1.75;
  text-wrap: pretty;
}

.experience-lab,
.case-room {
  display: grid;
  grid-template-columns: minmax(260px, 0.42fr) minmax(0, 1fr);
  gap: clamp(24px, 5vw, 62px);
  align-items: start;
}

.experience-tabs,
.case-selector {
  display: grid;
  gap: 12px;
  position: sticky;
  top: 96px;
}

.experience-tab,
.case-button {
  display: grid;
  gap: 8px;
  width: 100%;
  padding: 18px;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.86);
  color: var(--ink);
  transition: transform 200ms ease, border-color 200ms ease, background 200ms ease, box-shadow 200ms ease;
}

.experience-tab:hover,
.case-button:hover {
  transform: translateY(-2px);
  border-color: var(--blue-line);
  box-shadow: 0 14px 36px rgba(0, 55, 140, 0.08);
}

.experience-tab.is-active,
.case-button.is-active {
  border-color: var(--blue);
  background: var(--blue-soft);
}

.experience-tab span,
.case-button span,
.panel-meta {
  color: var(--soft);
  font-size: 0.88rem;
}

.experience-tab strong,
.case-button strong {
  font-size: 1.02rem;
}

.experience-tab em {
  color: var(--muted);
  font-style: normal;
  line-height: 1.58;
}

.experience-panel,
.case-panel {
  min-height: 580px;
  padding: clamp(28px, 4.6vw, 54px);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--white);
  box-shadow: 0 24px 70px rgba(0, 55, 140, 0.08);
}

.panel-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.experience-panel h3,
.case-panel h3 {
  max-width: 720px;
  margin-bottom: 18px;
  font-size: clamp(2rem, 4vw, 3.7rem);
  line-height: 1.08;
  letter-spacing: 0;
  text-wrap: balance;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  color: var(--blue-deep);
  background: var(--blue-soft);
  font-size: 0.9rem;
  font-weight: 700;
}

.evidence-list {
  display: grid;
  gap: 0;
  margin-top: 34px;
}

.evidence-item {
  display: grid;
  grid-template-columns: minmax(130px, 0.25fr) minmax(0, 1fr);
  gap: 24px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.evidence-item h4 {
  margin-bottom: 0;
  color: var(--blue-deep);
  font-size: 1rem;
}

.evidence-item p {
  margin-bottom: 0;
}

.case-panel-head {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.case-hook {
  max-width: 760px;
  margin-bottom: 36px;
  font-size: 1.12rem;
}

.case-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.case-step {
  min-height: 250px;
  padding: 22px;
  background: var(--white);
}

.case-step span {
  display: block;
  margin-bottom: 34px;
}

.case-step h4 {
  margin-bottom: 12px;
  font-size: 1.12rem;
}

.case-actions {
  justify-content: flex-end;
  margin-top: 30px;
}

.capability-canvas {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 14px;
}

.capability-tile {
  min-height: 230px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--white);
  box-shadow: 0 18px 52px rgba(0, 55, 140, 0.06);
}

.capability-tile:nth-child(1),
.capability-tile:nth-child(5) {
  grid-column: span 2;
}

.capability-tile:nth-child(2),
.capability-tile:nth-child(3),
.capability-tile:nth-child(4) {
  grid-column: span 2;
}

.capability-tile::before {
  content: attr(data-order);
  display: block;
  margin-bottom: 48px;
  color: var(--blue);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.capability-tile h3 {
  margin-bottom: 18px;
  font-size: clamp(1.35rem, 2.2vw, 2rem);
}

.contact-section {
  padding-bottom: clamp(64px, 8vw, 96px);
}

.contact-marquee {
  padding: clamp(30px, 6vw, 64px);
  color: var(--white);
  border-radius: var(--radius-md);
  background: var(--blue-dark);
  box-shadow: var(--shadow-blue);
}

.contact-marquee .section-kicker,
.contact-marquee p {
  color: rgba(255, 255, 255, 0.78);
}

.contact-marquee h2 {
  max-width: 820px;
  margin-bottom: 26px;
  font-size: clamp(2rem, 5vw, 4.8rem);
  line-height: 1.08;
  letter-spacing: 0;
  text-wrap: balance;
}

.contact-email {
  display: inline-block;
  color: var(--white);
  font-size: clamp(1.25rem, 3vw, 2.7rem);
}

.load-state,
.noscript-panel {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: var(--z-toast);
  max-width: 360px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--muted);
  background: var(--white);
  box-shadow: var(--shadow-blue);
}

.load-state.is-hidden {
  display: none;
}

.load-state.is-error {
  color: #9b1c1c;
}

.reveal-item {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 620ms ease, transform 620ms ease;
}

@supports (animation-timeline: view()) {
  .reveal-item {
    animation: revealIn both;
    animation-timeline: view();
    animation-range: entry 0% cover 28%;
  }
}

@keyframes revealIn {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .site-nav {
    display: none;
  }

  .hero-inner,
  .narrative-strip,
  .experience-lab,
  .case-room {
    grid-template-columns: 1fr;
  }

  .experience-tabs,
  .case-selector {
    position: static;
  }

  .case-steps,
  .capability-canvas {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .capability-tile,
  .capability-tile:nth-child(1),
  .capability-tile:nth-child(2),
  .capability-tile:nth-child(3),
  .capability-tile:nth-child(4),
  .capability-tile:nth-child(5) {
    grid-column: auto;
  }
}

@media (max-width: 640px) {
  .site-header,
  .hero-inner,
  .section-shell {
    width: min(100vw - 28px, var(--max));
  }

  .site-header {
    min-height: 66px;
  }

  .brand-mark span + span {
    display: none;
  }

  .header-email {
    font-size: 0.82rem;
    max-width: 52vw;
    text-align: right;
  }

  .hero {
    min-height: auto;
    padding-top: 58px;
  }

  .hero-actions,
  .case-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .hero-actions .primary-link,
  .hero-actions .text-link,
  .case-actions .primary-link {
    width: 100%;
    text-align: center;
  }

  h1 {
    max-width: 12ch;
    font-size: clamp(2.45rem, 12.2vw, 4rem);
  }

  .section-shell {
    padding: 68px 0;
  }

  .education-row,
  .evidence-item,
  .case-panel-head,
  .case-steps,
  .capability-canvas {
    grid-template-columns: 1fr;
  }

  .education-row {
    gap: 12px;
    align-items: start;
  }

  .experience-panel,
  .case-panel {
    min-height: auto;
    padding: 24px;
  }

  .case-step {
    min-height: auto;
  }

  .case-step span,
  .capability-tile::before {
    margin-bottom: 24px;
  }

  .load-state,
  .noscript-panel {
    left: 14px;
    right: 14px;
    bottom: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}