:root {
  --paper: #ffffff;
  --blue: #1670d0;
  --blue-deep: #1670d0;
  --blue-line: #0f79eb;
  --ink: #4a4a4a;
  --ink-strong: #151515;
  --muted: #8a8a8a;
  --muted-soft: #cfcfcf;
  --decor: #dbdbdb;
  --decor-strong: #c4c4c4;
  --line: rgba(15, 121, 235, 0.22);
  --line-soft: rgba(21, 21, 21, 0.1);
  --font-sans: "Source Han Sans SC", "Noto Sans CJK SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Heiti SC", SimHei, Arial, sans-serif;
  --page-pad: clamp(22px, 4.2vw, 82px);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 86px;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: geometricPrecision;
}

body.modal-open {
  overflow: hidden;
}

img {
  display: block;
  width: 100%;
}

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

button {
  font: inherit;
}

:focus-visible {
  outline: 1px solid var(--blue);
  outline-offset: 4px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.section-pad {
  padding: 100px var(--page-pad);
  scroll-margin-top: 86px;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding: 16px var(--page-pad);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(18px);
  transition: border-color 240ms ease, background 240ms ease, opacity 180ms ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line-soft);
  background: rgba(255, 255, 255, 0.97);
}

.site-header.is-hidden-on-preview {
  opacity: 0;
  pointer-events: none;
}

.brand-mark {
  display: grid;
  gap: 1px;
  min-width: 148px;
  color: var(--blue);
  font-size: 11px;
  line-height: 1.1;
  text-transform: uppercase;
}

.brand-mark span:first-child {
  font-size: 18px;
  font-weight: 600;
}

.brand-mark span:last-child {
  color: var(--muted);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(18px, 3vw, 42px);
  color: var(--ink);
  font-size: 12px;
}

.site-nav a {
  position: relative;
  padding: 8px 0;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 1px;
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 240ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--blue);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: transparent;
  color: var(--blue);
}

.menu-toggle span:not(.sr-only) {
  display: block;
  width: 18px;
  height: 1px;
  margin: 5px auto;
  background: currentColor;
}

.hero {
  min-height: 100vh;
  display: grid;
  align-content: space-between;
  gap: 70px;
  padding-top: 108px;
}

.hero-topline {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  color: var(--blue);
  font-size: clamp(14px, 1.8vw, 24px);
}

.hero-statement {
  max-width: 1120px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.2;
  text-transform: uppercase;
}

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

h1 {
  display: grid;
  gap: 8px;
  margin: 0 0 30px;
  color: var(--blue);
  line-height: 0.98;
  letter-spacing: 0.04em;
}

.hero-name {
  font-size: clamp(30px, 4.8vw, 74px);
  font-weight: 500;
}

.hero-title-line {
  font-size: clamp(48px, 6.8vw, 108px);
  font-weight: 500;
}

.hero-summary {
  display: grid;
  max-width: 720px;
  margin: 0;
  color: var(--ink);
}

.hero-summary p {
  margin: 0 0 18px;
  color: var(--ink);
  font-size: clamp(13px, 1.1vw, 16px);
  line-height: 1.5;
}

.hero-summary dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(180px, 1fr));
  gap: clamp(20px, 4vw, 64px);
  margin: 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
}

.hero-summary dt {
  margin-bottom: 8px;
  color: var(--blue);
  font-size: 11px;
  font-weight: 400;
  line-height: 1.1;
  text-transform: uppercase;
}

.hero-summary dd {
  margin: 0;
  color: #4f4f4f;
  font-size: clamp(16px, 1.55vw, 24px);
  font-weight: 500;
  line-height: 1.35;
}

.resume-strip {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(260px, 0.9fr) minmax(220px, 0.45fr);
  gap: clamp(24px, 5vw, 80px);
  border-top: 1px solid var(--line);
  padding-top: 28px;
}

.resume-strip span {
  display: block;
  margin-bottom: 14px;
  color: var(--blue);
  font-size: 18px;
}

.resume-strip p,
.resume-strip a {
  display: block;
  margin: 0 0 12px;
  color: var(--ink);
  font-size: 12px;
  line-height: 1.7;
}

.resume-strip address {
  font-style: normal;
}

.obys-preview {
  --preview-width: clamp(250px, 26vw, 350px);
  --preview-height: clamp(150px, 17vw, 230px);
  --preview-gap: 16px;
  --stage-height: max(100vh, 560px);
  --project-count: 22;
  --project-scroll-step: clamp(240px, 36vh, 360px);
  position: relative;
  min-height: calc(var(--stage-height) + (var(--project-count) - 1) * var(--project-scroll-step));
  padding: 0;
  overflow: visible;
  background: #fff;
}

.preview-frame {
  position: sticky;
  top: 0;
  height: var(--stage-height);
  overflow: hidden;
  background: #fff;
}

.preview-brand {
  position: absolute;
  top: -0.5vw;
  left: 0.3vw;
  z-index: 3;
  color: var(--blue);
  font-size: clamp(64px, 7.42vw, 142px);
  font-weight: 600;
  line-height: 0.78;
  letter-spacing: 0;
}

.preview-nav,
.preview-time,
.preview-contact,
.preview-about,
.preview-directory,
.preview-meta,
.preview-scope,
.preview-count,
.preview-mode,
.preview-rights {
  position: absolute;
  z-index: 4;
  font-size: 13px;
  line-height: 1.15;
}

.preview-nav {
  top: 14px;
  left: 74vw;
  display: flex;
  gap: 4px;
}

.preview-nav a {
  text-decoration: underline;
}

.preview-time {
  top: 14px;
  left: 82vw;
}

.preview-contact {
  top: 14px;
  right: 22px;
}

.preview-directory {
  left: 8px;
  top: 50%;
  display: grid;
  width: clamp(128px, 13vw, 168px);
  max-height: 190px;
  overflow-y: auto;
  scrollbar-width: none;
  transform: translateY(-50%);
}

.preview-directory::-webkit-scrollbar {
  display: none;
}

.directory-item {
  display: grid;
  align-items: center;
  min-height: 14px;
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--muted-soft);
  text-align: left;
  font-size: 12px;
  line-height: 1.12;
  cursor: pointer;
}

.directory-item span {
  display: block;
  max-width: 9em;
  white-space: normal;
  overflow-wrap: anywhere;
}

.directory-item.is-active,
.directory-item:hover,
.directory-item:focus-visible {
  color: var(--blue);
}

.preview-meta {
  top: 50%;
  left: clamp(176px, 17vw, 260px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  width: clamp(112px, 12vw, 150px);
  min-width: 0;
  color: var(--blue);
  transform: translateY(-50%);
}

.preview-meta span {
  display: block;
  overflow-wrap: anywhere;
}

.preview-stage {
  position: absolute;
  inset: 0;
  overflow: hidden;
  height: 100%;
  pointer-events: none;
}

.preview-strip {
  position: absolute;
  top: calc(50% - var(--preview-height) / 2);
  left: 50%;
  z-index: 2;
  width: var(--preview-width);
  height: auto;
  overflow: visible;
  overscroll-behavior: contain;
  padding: 0;
  scroll-snap-type: none;
  scrollbar-width: none;
  pointer-events: auto;
  will-change: transform;
  transform: translate3d(-50%, 0, 0);
}

.preview-strip::-webkit-scrollbar {
  display: none;
}

.preview-card {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  height: var(--preview-height);
  margin: 0 auto var(--preview-gap);
  border: 0;
  padding: 0;
  background: #fff;
  cursor: pointer;
  filter: grayscale(1);
  opacity: 0.16;
  overflow: hidden;
  transition: filter 180ms ease, opacity 180ms ease;
}

.preview-card:nth-child(3n + 1) {
  width: 100%;
}

.preview-card:nth-child(3n + 2) {
  width: 100%;
}

.preview-card:nth-child(3n) {
  width: 100%;
}

.preview-card.is-active,
.preview-card:hover,
.preview-card:focus-visible {
  filter: grayscale(0);
  opacity: 1;
}

.preview-card img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.preview-card:nth-child(2n) img {
  aspect-ratio: auto;
}

.bracket {
  position: absolute;
  top: 50%;
  z-index: 1;
  width: 60px;
  height: 140px;
  transform: translateY(-50%);
}

.bracket-left {
  left: calc(50% - var(--preview-width) / 2 - 88px);
}

.bracket-right {
  right: calc(50% - var(--preview-width) / 2 - 88px);
}

.bracket::before,
.bracket::after {
  content: "";
  position: absolute;
  width: 60px;
  height: 60px;
  border: 22px solid var(--blue);
}

.bracket-left::before {
  top: 0;
  left: 0;
  border-right: 0;
  border-bottom: 0;
}

.bracket-left::after {
  bottom: 0;
  left: 0;
  border-right: 0;
  border-top: 0;
}

.bracket-right::before {
  top: 0;
  right: 0;
  border-left: 0;
  border-bottom: 0;
}

.bracket-right::after {
  right: 0;
  bottom: 0;
  border-left: 0;
  border-top: 0;
}

.preview-about {
  top: 88px;
  right: clamp(26px, 4vw, 58px);
  max-width: 300px;
  color: var(--decor);
  font-size: 10px;
  font-weight: 100;
  pointer-events: none;
}

.preview-about p {
  margin-bottom: 2px;
}

.preview-about p:nth-of-type(2) {
  color: var(--decor-strong);
}

.preview-about a {
  color: var(--decor-strong);
  border-color: #e3e3e3;
  font-weight: 400;
  text-decoration: underline;
  text-decoration-color: #e3e3e3;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.preview-scope {
  top: 50%;
  right: clamp(76px, 9vw, 140px);
  max-width: 220px;
  color: var(--ink);
  transform: translateY(-50%);
}

.preview-count {
  top: 50%;
  right: clamp(22px, 2.2vw, 40px);
  color: var(--blue);
  transform: translateY(-50%);
}

.preview-mode {
  left: 8px;
  bottom: 18px;
}

.preview-mode::first-letter {
  text-decoration: underline;
}

.preview-rights {
  right: 18px;
  bottom: 18px;
  color: var(--muted-soft);
}

.philosophy {
  min-height: 58vh;
  display: grid;
  grid-template-columns: minmax(160px, 0.26fr) minmax(0, 1fr);
  gap: clamp(36px, 8vw, 150px);
  align-content: center;
  padding-top: 56px;
  padding-bottom: 56px;
  border-top: 1px solid var(--line-soft);
  background: #fff;
}

.philosophy-label {
  color: var(--muted-soft);
  font-size: 12px;
}

.philosophy h2 {
  grid-column: 2;
  margin: 0 0 18px;
  color: var(--blue);
  font-size: clamp(38px, 5.15vw, 86px);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: 0.04em;
}

.philosophy-subtitle {
  grid-column: 2;
  margin: 0 0 48px;
  max-width: 520px;
  color: var(--muted-soft);
  font-size: 12px;
  font-weight: 300;
  line-height: 1.45;
  text-transform: uppercase;
}

.philosophy-grid {
  grid-column: 2;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(22px, 4vw, 72px);
}

.philosophy-grid p {
  margin: 0;
  color: var(--ink);
  font-size: 13px;
  line-height: 1.45;
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.38fr);
  gap: 40px;
  align-items: end;
  border-top: 1px solid var(--line);
}

.contact h2 {
  margin-bottom: 0;
  max-width: 820px;
  color: var(--blue);
  font-size: clamp(32px, 4.03vw, 62px);
  font-weight: 500;
  line-height: 1.05;
}

.contact-panel {
  display: grid;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
}

.contact-panel a {
  color: var(--blue);
  font-size: 18px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 8px;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: none;
}

.modal.is-open {
  display: block;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(14px);
}

.modal-panel {
  position: absolute;
  inset: 28px;
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 24px;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--paper);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 2;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  background: var(--paper);
  color: var(--blue);
  cursor: pointer;
  font-size: 26px;
  line-height: 1;
}

.modal-meta {
  padding: 24px;
  align-self: end;
}

.modal-meta span,
.modal-meta p {
  color: var(--muted);
  font-size: 12px;
}

.modal-meta h2 {
  margin: 16px 0;
  color: var(--blue);
  font-size: clamp(30px, 4vw, 60px);
  font-weight: 500;
  line-height: 1;
}

.modal-image-wrap {
  overflow: auto;
  background: #f7f7f7;
}

.modal-image-wrap img {
  width: 100%;
  height: auto;
  min-height: 100%;
  object-fit: contain;
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 500ms var(--ease), transform 500ms var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 980px) {
  .section-pad {
    padding: 78px var(--page-pad);
  }

  .resume-strip,
  .contact {
    grid-template-columns: 1fr;
  }

  .modal-panel {
    grid-template-columns: 1fr;
    overflow: auto;
  }

  .modal-meta {
    padding-right: 72px;
    align-self: auto;
  }

  .obys-preview {
    min-height: auto;
    padding: 92px var(--page-pad);
    overflow: visible;
  }

  .preview-frame {
    position: relative;
    top: auto;
    height: auto;
    overflow: visible;
  }

  .preview-brand,
  .preview-nav,
  .preview-time,
  .preview-contact,
  .preview-about,
  .preview-directory,
  .preview-meta,
  .preview-scope,
  .preview-count,
  .preview-mode,
  .preview-rights {
    position: static;
  }

  .preview-brand {
    margin-bottom: 48px;
    font-size: clamp(60px, 15vw, 124px);
  }

  .preview-nav,
  .preview-time,
  .preview-contact,
  .preview-about,
  .preview-meta,
  .preview-scope,
  .preview-count,
  .preview-mode,
  .preview-rights {
    margin-bottom: 18px;
  }

  .preview-directory {
    width: auto;
    max-height: none;
    margin-bottom: 34px;
  }

  .directory-item span {
    max-width: none;
  }

  .preview-meta {
    min-width: 0;
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .preview-stage {
    position: relative;
    top: auto;
    display: block;
    height: auto;
    margin: 28px 0;
    pointer-events: auto;
  }

  .preview-strip {
    position: relative;
    top: auto;
    left: auto;
    width: 100%;
    height: auto;
    max-height: none;
    overflow: visible;
    padding: 0;
    transform: none;
  }

  .preview-card,
  .preview-card:nth-child(3n + 1),
  .preview-card:nth-child(3n + 2),
  .preview-card:nth-child(3n) {
    width: min(520px, 100%);
    opacity: 1;
    filter: grayscale(0);
  }

  .bracket {
    display: none;
  }

  .philosophy,
  .philosophy h2,
  .philosophy-subtitle,
  .philosophy-grid {
    grid-template-columns: 1fr;
    grid-column: auto;
  }

  .philosophy-grid {
    gap: 26px;
  }
}

@media (max-width: 720px) {
  .site-header {
    min-height: 64px;
  }

  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: 64px;
    left: var(--page-pad);
    right: var(--page-pad);
    display: none;
    padding: 16px;
    border: 1px solid var(--line-soft);
    border-radius: 6px;
    background: var(--paper);
  }

  .site-nav.is-open {
    display: grid;
  }

  .hero {
    min-height: auto;
    padding-top: 96px;
  }

  .hero-topline {
    display: grid;
    font-size: 14px;
  }

  h1 {
    gap: 6px;
    letter-spacing: 0.04em;
  }

  .hero-name {
    font-size: clamp(28px, 10vw, 50px);
  }

  .hero-title-line {
    font-size: clamp(44px, 14vw, 72px);
  }

  .hero-summary dl {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .modal-panel {
    inset: 12px;
  }
}

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