:root {
  --ink: #111111;
  --paper: #ffffff;
  --gray: #6b6b6b;
  --line: #e4e4e4;
  --font-display: "Helvetica Neue", "Arial Black", Arial, "Hiragino Kaku Gothic ProN",
    "Hiragino Sans", Meiryo, sans-serif;
  --font-body: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN",
    "Hiragino Sans", Meiryo, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.8;
  overflow-x: hidden;
}

::selection {
  background: var(--ink);
  color: var(--paper);
}

/* ---------- nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.1rem 6vw;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--ink);
}

.nav__logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: 0.08em;
  color: var(--ink);
  text-decoration: none;
}

.nav__dot {
  display: inline-block;
  animation: blink 2.4s steps(1) infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.nav__links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav__links a {
  position: relative;
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-decoration: none;
  padding-bottom: 2px;
}

.nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s ease;
}

.nav__links a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* ---------- hero ---------- */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  align-items: center;
  gap: 3rem;
  max-width: 1160px;
  margin: 0 auto;
  padding: 5rem 6vw 6rem;
  min-height: calc(100vh - 65px);
}

.hero__eyebrow {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.35em;
  color: var(--gray);
  margin-bottom: 1.2rem;
  animation: fade-up 0.8s ease 0.1s both;
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 6.6vw, 5.4rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

.hero__line {
  display: block;
  overflow: hidden;
}

.hero__line span {
  display: inline-block;
  animation: rise 0.9s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.hero__line:nth-child(2) span {
  animation-delay: 0.15s;
}

.hero__line--outline span {
  color: transparent;
  -webkit-text-stroke: 2px var(--ink);
}

@keyframes rise {
  from { transform: translateY(110%); }
  to { transform: translateY(0); }
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero__lead {
  margin: 1.6rem 0 2.2rem;
  color: var(--gray);
  animation: fade-up 0.8s ease 0.45s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  background: var(--ink);
  color: var(--paper);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  padding: 0.85rem 2.1rem;
  border: 2px solid var(--ink);
  border-radius: 9999px;
  text-decoration: none;
  transition: background 0.25s ease, color 0.25s ease;
  animation: fade-up 0.8s ease 0.6s both;
}

.btn:hover {
  background: var(--paper);
  color: var(--ink);
}

.btn__arrow {
  display: inline-block;
  transition: transform 0.25s ease;
}

.btn:hover .btn__arrow {
  transform: translateX(5px);
}

/* ---------- portrait ---------- */

.hero__visual {
  display: flex;
  justify-content: center;
}

.portrait {
  position: relative;
  width: min(340px, 72vw);
  aspect-ratio: 1;
  animation: fade-up 0.9s ease 0.3s both;
}

.portrait__ring {
  position: absolute;
  inset: -12%;
  width: 124%;
  height: 124%;
  animation: spin 24s linear infinite;
}

.portrait__ring text {
  font-family: var(--font-display);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.32em;
  fill: var(--ink);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.portrait__frame {
  position: absolute;
  inset: 6%;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--ink);
  background: var(--paper);
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.portrait:hover .portrait__frame {
  transform: scale(1.04);
}

.portrait__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  display: block;
}

/* ---------- marquee ---------- */

.marquee {
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  padding: 0.85rem 0;
}

.marquee__track {
  display: flex;
  width: max-content;
  white-space: nowrap;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  animation: scroll-left 28s linear infinite;
}

.marquee__track--reverse {
  animation: scroll-right 28s linear infinite;
}

@keyframes scroll-left {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

@keyframes scroll-right {
  from { transform: translateX(-50%); }
  to { transform: translateX(0); }
}

/* ---------- sections ---------- */

.section {
  max-width: 1160px;
  margin: 0 auto;
  padding: 6rem 6vw;
}

.section__index {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  color: var(--gray);
}

.section__index::after {
  content: "";
  display: inline-block;
  width: 48px;
  height: 1px;
  background: currentColor;
  vertical-align: middle;
  margin-left: 0.8rem;
}

.section__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  text-transform: uppercase;
  letter-spacing: -0.01em;
  margin: 0.4rem 0 2.4rem;
}

.about__body p {
  max-width: 640px;
  color: var(--gray);
  font-size: 1.05rem;
}

/* ---------- works ---------- */

.section--dark {
  max-width: none;
  background: var(--ink);
  color: var(--paper);
}

.section--dark > * {
  max-width: 1032px;
  margin-left: auto;
  margin-right: auto;
}

.section--dark .section__index {
  color: #9a9a9a;
}

.section--dark .section__title {
  margin-bottom: 2.4rem;
}

.works {
  list-style: none;
  border-top: 1px solid #3a3a3a;
}

.works__link {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 1.9rem 1rem;
  border-bottom: 1px solid #3a3a3a;
  color: var(--paper);
  text-decoration: none;
  transition: background 0.3s ease, color 0.3s ease, padding-left 0.3s ease;
}

.works__link:hover {
  background: var(--paper);
  color: var(--ink);
  padding-left: 1.8rem;
}

.works__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.6rem;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--paper);
  min-width: 3.2rem;
  transition: -webkit-text-stroke-color 0.3s ease;
}

.works__link:hover .works__num {
  -webkit-text-stroke-color: var(--ink);
}

.works__body {
  flex: 1;
  min-width: 0;
}

.works__name {
  display: block;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
}

.works__desc {
  display: block;
  font-size: 0.92rem;
  color: #9a9a9a;
  transition: color 0.3s ease;
}

.works__link:hover .works__desc {
  color: var(--gray);
}

.works__arrow {
  font-size: 1.5rem;
  transition: transform 0.3s ease;
}

.works__link:hover .works__arrow {
  transform: translateX(8px);
}

/* ---------- contact ---------- */

#contact {
  text-align: center;
}

#contact .section__index::before {
  content: "";
  display: inline-block;
  width: 48px;
  height: 1px;
  background: currentColor;
  vertical-align: middle;
  margin-right: 0.8rem;
}

#contact .section__index::after {
  margin-left: 0.8rem;
}

.contact__lead {
  color: var(--gray);
  margin-bottom: 2rem;
}

.contact__mail {
  display: inline-flex;
  align-items: baseline;
  gap: 1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.8rem, 6vw, 4rem);
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 4px solid var(--ink);
  padding-bottom: 0.3rem;
  transition: color 0.3s ease, border-color 0.3s ease;
}

.contact__mail:hover {
  color: transparent;
  -webkit-text-stroke: 2px var(--ink);
}

.contact__mail-arrow {
  display: inline-block;
  transition: transform 0.3s ease;
}

.contact__mail:hover .contact__mail-arrow {
  transform: translate(6px, -6px);
}

/* ---------- footer ---------- */

.footer {
  border-top: 1px solid var(--ink);
}

.marquee--footer {
  border: none;
}

.footer__copy {
  text-align: center;
  font-size: 0.85rem;
  color: var(--gray);
  padding: 1.4rem 1.5rem;
}

/* ---------- reveal on scroll ---------- */

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

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

/* ---------- responsive ---------- */

@media (max-width: 760px) {
  .hero {
    grid-template-columns: 1fr;
    padding-top: 3.5rem;
    gap: 3.5rem;
    min-height: 0;
    text-align: center;
  }

  .hero__visual {
    order: -1;
  }

  .nav {
    flex-direction: column;
    gap: 0.6rem;
    padding: 0.9rem 6vw;
  }

  .works__link {
    gap: 1rem;
    padding: 1.4rem 0.6rem;
  }

  .works__num {
    min-width: 2.4rem;
    font-size: 1.2rem;
  }

  .works__arrow {
    display: none;
  }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero__eyebrow,
  .hero__line span,
  .hero__lead,
  .btn,
  .portrait {
    animation: none;
  }

  .portrait__ring,
  .marquee__track,
  .nav__dot {
    animation: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}