:root {
  --font-sans: Inter, "SF Pro Display", "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", system-ui, sans-serif;
  --page-pad: clamp(20px, 4vw, 64px);
  --max-width: 1440px;
  --radius: 6px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: #f3f4f1; }
body { min-width: 320px; margin: 0; font-family: var(--font-sans); letter-spacing: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
figure, h1, h2, h3, h4, p { margin-top: 0; }
p { line-break: strict; text-wrap: pretty; }
h1, h2, h3, h4 { line-break: strict; text-wrap: balance; }
.locked-heading span { display: block; white-space: nowrap; }

.site-shell {
  --bg: #f3f4f1;
  --surface: #e9ebe7;
  --text: #101211;
  --muted: #5f6561;
  --soft: #858b87;
  --line: #cbd0cc;
  --accent: #2357ff;
  --signal: #b9f548;
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--text);
  background: var(--bg);
}

.site-shell[data-theme="dark"] {
  --bg: #0b0d0c;
  --surface: #151816;
  --text: #f1f3ef;
  --muted: #a5aca7;
  --soft: #737a75;
  --line: #303531;
  --accent: #6f91ff;
  --signal: #b9f548;
}

.site-header,
.hero,
.perspective,
.experience,
.works,
.beyond,
.education,
.contact,
.site-footer {
  width: min(var(--max-width), 100%);
  margin: 0 auto;
  padding-left: var(--page-pad);
  padding-right: var(--page-pad);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 72px;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 75%, transparent);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(18px);
}

.wordmark { font-size: 12px; font-weight: 800; }
.nav-links { display: flex; gap: clamp(18px, 3vw, 42px); font-size: 13px; color: var(--muted); }
.header-controls { display: flex; justify-content: flex-end; gap: 8px; }
.text-button, .icon-button {
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--text);
  background: transparent;
  cursor: pointer;
}
.text-button { width: 44px; border-radius: 999px; font-size: 11px; font-weight: 750; }
.icon-button { width: 34px; }
.nav-links a, .wordmark, .text-button, .icon-button, .text-link, .contact-links a, .site-footer a {
  transition: color 180ms var(--ease), border-color 180ms var(--ease), transform 180ms var(--ease);
}
.nav-links a:hover, .text-link:hover, .contact-links a:hover, .site-footer a:hover { color: var(--accent); }
.text-button:hover, .icon-button:hover { border-color: var(--accent); transform: translateY(-1px); }

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(360px, 0.8fr);
  align-items: end;
  gap: clamp(36px, 7vw, 110px);
  min-height: min(900px, calc(100vh - 72px));
  padding-top: clamp(72px, 10vh, 120px);
  padding-bottom: clamp(34px, 5vw, 64px);
}

.hero-copy { display: flex; align-self: stretch; max-width: 890px; flex-direction: column; padding-bottom: 24px; }
.kicker { margin-bottom: 22px; color: var(--accent); font-size: 11px; font-weight: 800; line-height: 1.4; text-transform: uppercase; }
h1 {
  display: flex;
  max-width: 940px;
  flex-direction: column;
  gap: clamp(12px, 1.2vw, 18px);
  margin-bottom: 70px;
  font-size: clamp(50px, 6.4vw, 88px);
  font-weight: 650;
  line-height: 1;
}
.hero h1 span:first-child { font-size: 1.12em; }
h2 { margin-bottom: 38px; font-size: clamp(36px, 4.6vw, 64px); font-weight: 620; line-height: 1.08; }
h3 { margin-bottom: 26px; font-size: clamp(22px, 2.3vw, 32px); font-weight: 620; line-height: 1.18; }
h4 { margin-bottom: 10px; font-size: 16px; font-weight: 620; line-height: 1.3; }

.hero-intro {
  max-width: 780px;
  margin-top: auto;
  margin-bottom: 58px;
  color: var(--muted);
  font-size: clamp(16px, 1.35vw, 19px);
  line-height: 1.9;
}
.hero-actions { display: flex; align-items: center; gap: 22px; }
.primary-link {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0 24px;
  color: white;
  background: var(--accent);
  font-size: 14px;
  font-weight: 700;
}
.primary-link:hover { transform: translateY(-2px); }
.text-link { border-bottom: 1px solid var(--line); padding: 12px 0; color: var(--muted); font-size: 14px; }

.hero-portrait { position: relative; margin: 0; }
.hero-portrait picture { display: block; overflow: hidden; background: var(--surface); }
.hero-portrait img { display: block; width: 100%; aspect-ratio: 0.72; object-fit: cover; object-position: 50% 42%; filter: saturate(0.86) contrast(1.02); }
.hero-portrait figcaption { display: flex; justify-content: space-between; margin-top: 12px; color: var(--soft); font-size: 10px; font-weight: 750; }

.section-index { color: var(--accent); font-size: clamp(26px, 2.4vw, 34px); font-weight: 430; line-height: 1; font-variant-numeric: tabular-nums; }
.section-rail {
  position: fixed;
  top: 50%;
  left: 10px;
  z-index: 40;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 15px;
  transform: translateY(-50%);
}
.section-rail a { position: relative; display: flex; align-items: center; min-width: 34px; height: 10px; }
.rail-dot {
  display: block;
  width: 10px;
  height: 2px;
  background: var(--soft);
  opacity: 0.58;
  transition: width 320ms var(--ease), height 320ms var(--ease), opacity 220ms ease, background 220ms ease;
}
.rail-label {
  position: absolute;
  left: 38px;
  padding: 5px 8px;
  color: var(--text);
  background: var(--bg);
  font-size: 10px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transform: translateX(-6px);
  transition: opacity 180ms ease, transform 180ms ease;
}
.section-rail a:hover .rail-label, .section-rail a:focus-visible .rail-label { opacity: 1; transform: translateX(0); }
.section-rail a.is-active .rail-dot { width: 28px; height: 3px; opacity: 1; background: var(--accent); }

.perspective {
  display: flex;
  justify-content: center;
  border-top: 1px solid var(--line);
  padding-top: clamp(100px, 11vw, 156px);
  padding-bottom: clamp(110px, 13vw, 186px);
}
.perspective-copy { position: relative; width: min(100%, 1180px); padding: 12px 62px 42px; text-align: center; }
.perspective-copy h2 { max-width: 1100px; margin: 0 auto; font-size: clamp(25px, 2.3vw, 32px); font-weight: 410; line-height: 1.58; }
.perspective-copy h2 span { display: block; white-space: nowrap; }
.perspective-copy::before,
.perspective-copy::after { position: absolute; color: var(--accent); font-family: Georgia, serif; font-size: 52px; font-weight: 400; line-height: 1; opacity: 0.52; }
.perspective-copy::before { top: -4px; left: 0; content: "“"; }
.perspective-copy::after { right: 2px; bottom: -22px; content: "”"; }

.experience, .works, .beyond, .education { border-top: 1px solid var(--line); padding-top: clamp(80px, 10vw, 144px); padding-bottom: clamp(90px, 12vw, 170px); }
.section-intro { display: grid; grid-template-columns: 80px minmax(0, 1fr); gap: clamp(24px, 5vw, 76px); margin-bottom: clamp(96px, 11vw, 156px); }
.section-intro > div:last-child { display: grid; grid-template-columns: minmax(330px, 0.8fr) minmax(280px, 0.65fr); column-gap: clamp(40px, 7vw, 120px); align-items: end; }
.section-intro .kicker { grid-column: 1 / -1; }
.section-intro h2 { margin-bottom: 10px; }
.section-intro > div > p:last-child { margin-bottom: 6px; color: var(--muted); font-size: 15px; line-height: 1.9; }
.section-intro.compact > div:last-child { grid-template-columns: minmax(330px, 0.8fr) minmax(300px, 0.75fr); }

.case-row { display: grid; grid-template-columns: minmax(170px, 0.36fr) minmax(0, 1fr); gap: clamp(32px, 7vw, 112px); border-top: 1px solid var(--line); padding: clamp(58px, 7vw, 94px) 0; }
.case-meta span { display: block; margin-bottom: 18px; color: var(--accent); font-size: 10px; font-weight: 750; }
.case-meta p { color: var(--soft); font-size: 13px; }
.case-copy h3 { margin-bottom: 30px; }
.case-copy > p { max-width: 860px; margin-bottom: 0; color: var(--muted); font-size: 15px; line-height: 1.9; }
.case-outcomes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 42px; background: var(--line); }
.case-outcomes > div { min-height: 150px; padding: 22px; background: var(--bg); }
.case-outcomes strong, .case-outcomes span { display: block; }
.case-outcomes strong { margin-bottom: 24px; font-size: clamp(34px, 4vw, 56px); font-weight: 570; }
.case-outcomes span { color: var(--muted); font-size: 13px; }
.case-outcomes .target strong { color: var(--accent); }
.payment-outcomes strong { font-size: clamp(27px, 3vw, 43px); letter-spacing: 0; }
.payment-outcomes { grid-template-columns: repeat(4, 1fr); }

.abao-visual {
  display: grid;
  grid-template-columns: minmax(270px, 0.72fr) minmax(360px, 1.28fr);
  align-items: stretch;
  gap: clamp(42px, 7vw, 96px);
  margin-top: clamp(64px, 8vw, 108px);
  border-top: 1px solid var(--line);
  padding-top: clamp(44px, 6vw, 72px);
}
.visual-label { margin-bottom: 28px; color: var(--accent); font-size: 10px; font-weight: 800; }
.phone-stage { display: flex; min-width: 0; flex-direction: column; }
.phone-mockup {
  width: min(100%, 340px);
  border: 1px solid var(--line);
  border-radius: 26px;
  padding: 8px;
  background: var(--surface);
  box-shadow: 0 24px 70px color-mix(in srgb, var(--text) 9%, transparent);
}
.phone-mockup img { display: block; width: 100%; height: auto; border-radius: 20px; }
.journey-visual { display: flex; min-width: 0; flex-direction: column; }
.journey-visual ol { position: relative; display: flex; flex: 1; flex-direction: column; justify-content: space-between; gap: 0; margin: 0; padding: 0; list-style: none; }
.journey-visual ol::before { position: absolute; top: 34px; bottom: 34px; left: 20px; width: 1px; background: var(--accent); content: ""; }
.journey-visual li { position: relative; display: grid; grid-template-columns: 42px 1fr; column-gap: 22px; align-items: center; min-height: 68px; }
.journey-visual li:not(:first-child)::after {
  position: absolute;
  top: -8px;
  left: 17px;
  width: 7px;
  height: 7px;
  border-right: 1px solid var(--accent);
  border-bottom: 1px solid var(--accent);
  content: "";
  transform: rotate(45deg);
}
.journey-visual li span { z-index: 1; display: grid; width: 42px; height: 42px; place-items: center; border: 1px solid var(--accent); border-radius: 50%; color: var(--accent); background: var(--bg); font-size: 10px; }
.journey-visual li strong { font-size: 17px; font-weight: 570; }
.journey-visual li small { grid-column: 2; margin-top: -18px; color: var(--soft); font-size: 11px; }

.internship-block { display: grid; grid-template-columns: minmax(220px, 0.48fr) minmax(0, 1fr); gap: clamp(42px, 8vw, 130px); margin-top: 0; border-top: 1px solid var(--line); padding-top: clamp(90px, 11vw, 150px); }
.internship-heading h3 { font-size: clamp(27px, 3vw, 40px); }
.role-list { border-top: 1px solid var(--line); }
.role-list article { display: grid; grid-template-columns: minmax(250px, 0.7fr) 1fr; gap: 34px; border-bottom: 1px solid var(--line); padding: 28px 0; }
.role-list article > div span { display: block; margin-bottom: 8px; color: var(--soft); font-size: 11px; }
.role-list article p { margin-bottom: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }

.project-list, .beyond-list { border-top: 1px solid var(--line); }
.project-row { display: grid; grid-template-columns: 80px minmax(0, 1fr) minmax(190px, 0.35fr); gap: clamp(26px, 5vw, 80px); border-bottom: 1px solid var(--line); padding: clamp(38px, 5vw, 66px) 0; }
.project-number { color: var(--soft); font-size: 12px; }
.project-status { margin-bottom: 14px; color: var(--accent); font-size: 10px; font-weight: 800; }
.project-copy h3 { margin-bottom: 16px; }
.project-copy > p:last-child { max-width: 820px; margin-bottom: 0; color: var(--muted); font-size: 16px; line-height: 1.75; }
.project-tags { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; }
.project-tags span { border-bottom: 1px solid var(--line); padding: 7px 0; color: var(--soft); font-size: 10px; }

.object-label { display: block; margin-bottom: clamp(70px, 9vw, 130px); color: var(--accent); font-size: 10px; font-weight: 800; }
.beyond-list { display: grid; grid-template-columns: repeat(3, 1fr); background: var(--line); gap: 1px; }
.beyond-list article { min-height: 430px; padding: clamp(24px, 3vw, 40px); background: var(--bg); }
.beyond-list h3 { font-size: clamp(24px, 2.6vw, 36px); }
.beyond-list h3.locked-heading { font-size: 24px; line-height: 1.25; }
.beyond-list p { margin-bottom: 0; color: var(--muted); font-size: 13px; line-height: 1.85; }
.personal-metrics { display: flex; gap: 28px; margin-top: 38px; border-top: 1px solid var(--line); padding-top: 22px; }
.personal-metrics strong, .personal-metrics span { display: block; }
.personal-metrics strong { margin-bottom: 5px; font-size: 25px; font-weight: 590; }
.personal-metrics span { color: var(--soft); font-size: 10px; }

.works-list { display: grid; grid-template-columns: minmax(0, 1fr); gap: 1px; border-top: 1px solid var(--line); background: var(--line); }
.work-card { display: flex; flex-direction: column; background: var(--bg); }
.work-cover { position: relative; margin: 0; overflow: hidden; border-bottom: 1px solid var(--line); background: var(--surface); }
.work-cover img { display: block; width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.work-status {
  position: absolute;
  top: 14px;
  left: 14px;
  border-radius: 999px;
  padding: 6px 12px;
  color: #101211;
  background: var(--signal);
  font-size: 10px;
  font-weight: 800;
}
.work-copy { display: flex; flex: 1; flex-direction: column; padding: clamp(24px, 3vw, 40px); }
.work-copy .object-label { margin-bottom: 22px; }
.work-copy h3 { margin-bottom: 18px; font-size: clamp(24px, 2.4vw, 34px); }
.work-copy p { margin-bottom: 0; color: var(--muted); font-size: 13px; line-height: 1.85; }
.work-action { display: inline-flex; align-self: flex-start; margin-top: 28px; border-bottom: 1px solid var(--line); padding: 10px 0; color: var(--soft); font-size: 11px; font-weight: 750; }
.work-action--link { color: var(--accent); border-bottom-color: var(--accent); }
.work-card--link { transition: transform 240ms var(--ease); }
.work-card--link:hover { transform: translateY(-3px); }
.work-card--link .work-cover img { transition: transform 500ms var(--ease); }
.work-card--link:hover .work-cover img { transform: scale(1.03); }

.education { display: grid; grid-template-columns: 80px minmax(250px, 0.58fr) minmax(0, 1fr); gap: clamp(24px, 5vw, 76px); }
.education-heading h2 { font-size: clamp(34px, 4vw, 56px); }
.education-list { border-top: 1px solid var(--line); }
.education-list article { display: grid; grid-template-columns: 120px 1fr; gap: 24px; border-bottom: 1px solid var(--line); padding: 28px 0; }
.education-list article > span { color: var(--soft); font-size: 11px; }
.education-list h3 { margin-bottom: 8px; font-size: 22px; }
.education-list p { margin-bottom: 0; color: var(--muted); font-size: 13px; }

.contact { border-top: 1px solid var(--line); padding-top: clamp(90px, 12vw, 170px); padding-bottom: clamp(80px, 10vw, 140px); }
.contact h2 { max-width: 1120px; margin-bottom: clamp(64px, 8vw, 104px); }
.contact-links { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); }
.contact-links a { display: flex; flex-direction: column; gap: 28px; border-bottom: 1px solid var(--line); padding: 26px 0; }
.contact-links a + a { border-left: 1px solid var(--line); padding-left: clamp(24px, 4vw, 64px); }
.contact-links span { color: var(--soft); font-size: 10px; }
.contact-links strong { font-size: clamp(17px, 2vw, 25px); font-weight: 560; }
.site-footer { display: flex; justify-content: space-between; border-top: 1px solid var(--line); padding-top: 28px; padding-bottom: 34px; color: var(--soft); font-size: 10px; }

@media (max-width: 980px) {
  .hero { grid-template-columns: 1.1fr 0.7fr; min-height: auto; }
  .perspective-copy { padding-right: 32px; }
  .perspective-copy h2 { font-size: 27px; }
  .section-intro { grid-template-columns: 48px 1fr; }
  .section-intro > div:last-child { grid-template-columns: 1fr; align-items: start; }
  .section-intro h2 { margin-bottom: 28px; }
  .role-list article { grid-template-columns: 1fr; gap: 10px; }
  .project-row { grid-template-columns: 48px 1fr; }
  .project-tags { grid-column: 2; flex-direction: row; flex-wrap: wrap; }
  .beyond-list { grid-template-columns: 1fr; }
  .beyond-list article { min-height: 0; }
  .object-label { margin-bottom: 58px; }
  .beyond-list h3.locked-heading { font-size: 30px; }
  .education { grid-template-columns: 48px 0.7fr 1fr; }
  .abao-visual { grid-template-columns: minmax(240px, 0.8fr) minmax(300px, 1.2fr); gap: 40px; }
  .payment-outcomes { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  :root { --page-pad: 34px; }
  .site-header { grid-template-columns: minmax(0, 1fr) auto; grid-template-rows: 46px auto; row-gap: 0; min-height: 0; padding-top: 6px; }
  .wordmark { grid-row: 1; grid-column: 1; align-self: center; }
  .header-controls { grid-row: 1; grid-column: 2; align-self: center; }
  .nav-links { grid-row: 2; grid-column: 1 / -1; display: flex; justify-content: space-between; width: 100%; margin-top: 0; padding: 10px 0 14px; font-size: 12px; }
  .hero { grid-template-columns: 1fr; gap: 46px; min-height: auto; padding-top: 72px; }
  .hero-copy { display: block; padding-bottom: 0; }
  h1 { font-size: 52px; }
  h2 { font-size: 38px; }
  .locked-heading { font-size: 34px; }
  .hero h1.locked-heading { margin-bottom: 54px; font-size: 48px; }
  .beyond-list h3.locked-heading { font-size: 26px; }
  .hero-intro { margin-top: 0; margin-bottom: 48px; font-size: 15px; line-height: 1.85; }
  .hero-actions { align-items: stretch; flex-direction: column; gap: 8px; }
  .primary-link { width: 100%; min-height: 48px; }
  .text-link { text-align: center; }
  .hero-portrait { width: 100%; }
  .hero-portrait img { aspect-ratio: 0.83; object-position: 50% 40%; }
  .perspective, .education { grid-template-columns: 1fr; gap: 22px; padding-top: 88px; padding-bottom: 104px; }
  .education .section-index { margin-bottom: 26px; }
  .perspective-copy { padding: 16px 28px 38px; }
  .perspective-copy h2 { font-size: 24px; line-height: 1.55; }
  .perspective-copy h2 span { white-space: normal; }
  .section-intro { grid-template-columns: 1fr; gap: 22px; margin-bottom: 88px; }
  .section-intro .section-index { margin-bottom: 24px; }
  .section-index { font-size: 26px; }
  .case-row { grid-template-columns: 1fr; gap: 28px; padding: 56px 0; }
  .case-meta { display: flex; justify-content: space-between; }
  .case-outcomes { grid-template-columns: 1fr; }
  .case-outcomes > div { min-height: 0; }
  .abao-visual { grid-template-columns: 1fr; gap: 72px; margin-top: 58px; }
  .phone-mockup { width: min(100%, 330px); margin: 0 auto; }
  .journey-visual ol { flex: none; gap: 32px; }
  .journey-visual li:not(:first-child)::after { top: -21px; }
  .journey-visual li { grid-template-columns: 42px 1fr; }
  .internship-block { grid-template-columns: 1fr; gap: 52px; }
  .works-list { grid-template-columns: 1fr; }
  .project-row { grid-template-columns: 36px 1fr; gap: 18px; }
  .project-tags { grid-column: 1 / -1; padding-left: 54px; }
  .education-list article { grid-template-columns: 1fr; gap: 10px; }
  .education-list article:last-child,
  .role-list article:last-child,
  .contact-links a:last-child { border-bottom: 0; }
  .contact-links { grid-template-columns: 1fr; }
  .contact-links a + a { border-left: 0; padding-left: 0; }
  .contact-links strong { overflow-wrap: anywhere; }
  .site-footer { gap: 18px; flex-wrap: wrap; }
  .section-rail { right: 3px; left: auto; gap: 13px; }
  .section-rail a { min-width: 24px; justify-content: flex-end; }
  .rail-label { display: none; }
  .section-rail a.is-active .rail-dot { width: 22px; }
}

@media (max-width: 420px) {
  :root { --page-pad: 34px; }
  h1 { font-size: 44px; }
  h2 { font-size: 34px; }
  h3 { font-size: 24px; }
  .hero h1.locked-heading { margin-bottom: 50px; font-size: 44px; }
  .locked-heading { font-size: 30px; }
  .perspective-copy { padding-right: 24px; padding-left: 24px; }
  .perspective-copy h2 { font-size: 22px; }
  .perspective-copy::before, .perspective-copy::after { font-size: 42px; }
  .perspective-copy::after { right: 2px; bottom: -14px; }
  .case-meta { align-items: flex-start; gap: 16px; }
  .case-meta p { max-width: 210px; text-align: right; }
  .case-outcomes strong { font-size: 34px; }
  .payment-outcomes strong { font-size: 29px; }
  .phone-mockup { width: 100%; }
  .beyond-list h3.locked-heading { font-size: 25px; }
  .personal-metrics { gap: 20px; }
  .education-heading h2 { font-size: 30px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}