/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --black:   #111111;
  --ink:     #1d1d1d;
  --gray-9:  #2b2b2b;
  --gray-6:  #6b6b6b;
  --gray-4:  #9a9a9a;
  --gray-2:  #d8d8d8;
  --gray-1:  #ececec;
  --paper:   #ffffff;
  --bg:      #fafafa;
  --line:    #e3e3e3;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Helvetica Neue', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', Meiryo, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img, video { display: block; max-width: 100%; }
ul { list-style: none; }
.serif { font-family: 'Times New Roman', 'Yu Mincho', 'Hiragino Mincho ProN', serif; }

:focus-visible { outline: 2px solid var(--black); outline-offset: 3px; }
::selection { background: var(--black); color: var(--paper); }

/* ===== SCROLL REVEAL ===== */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.js .reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ===== HEADER ===== */
header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  max-width: 1080px; margin: 0 auto; padding: 0 32px;
  height: 72px; display: flex; align-items: center; justify-content: space-between;
}
.logo {
  font-family: 'Times New Roman', serif; font-size: 1.3rem; letter-spacing: .04em;
  color: var(--black);
}
.logo .dot { color: var(--gray-4); }
nav { display: flex; gap: 36px; align-items: center; }
nav a.nav-link { font-size: .82rem; letter-spacing: .08em; color: var(--gray-6); text-transform: uppercase; transition: color .2s; }
nav a.nav-link:hover, nav a.nav-link.active { color: var(--black); }
nav .nav-cta { border: 1px solid var(--black); color: var(--black); padding: 8px 20px; font-size: .82rem; letter-spacing: .08em; text-transform: uppercase; transition: all .2s; }
nav .nav-cta:hover { background: var(--black); color: var(--paper); }

/* Hamburger (mobile only) */
.nav-burger {
  display: none; background: none; border: 0; cursor: pointer;
  width: 40px; height: 40px; padding: 8px;
  flex-direction: column; justify-content: center; gap: 7px;
}
.nav-burger span { display: block; height: 1.5px; width: 100%; background: var(--black); transition: transform .25s ease, opacity .2s ease; }
.nav-open .nav-burger span:first-child { transform: translateY(4.25px) rotate(45deg); }
.nav-open .nav-burger span:last-child { transform: translateY(-4.25px) rotate(-45deg); }

/* ===== HERO (index) ===== */
.hero { max-width: 1080px; margin: 0 auto; padding: 120px 32px 96px; border-bottom: 1px solid var(--line); }
.hero .eyebrow { font-size: .76rem; letter-spacing: .28em; text-transform: uppercase; color: var(--gray-4); margin-bottom: 26px; }
.hero h1 { font-size: clamp(2.1rem, 5.5vw, 3.6rem); font-weight: 400; line-height: 1.35; margin-bottom: 28px; max-width: 760px; }
.hero h1 b { font-weight: 700; }
.hero p { max-width: 560px; color: var(--gray-6); font-size: 1rem; margin-bottom: 40px; }
.hero-actions { display: flex; gap: 18px; flex-wrap: wrap; }

/* ===== BUTTONS ===== */
.btn { display: inline-block; font-size: .9rem; letter-spacing: .05em; padding: 15px 38px; transition: all .2s; border: 1px solid var(--black); }
.btn-dark { background: var(--black); color: var(--paper); }
.btn-dark:hover { background: var(--gray-9); transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--black); }
.btn-outline:hover { background: var(--black); color: var(--paper); transform: translateY(-2px); }

/* ===== PAGE HEAD (works / about / detail) ===== */
.page-head { max-width: 1080px; margin: 0 auto; padding: 100px 32px 70px; border-bottom: 1px solid var(--line); }
.page-head .eyebrow { font-size: .76rem; letter-spacing: .28em; text-transform: uppercase; color: var(--gray-4); margin-bottom: 26px; }
.page-head h1 { font-size: clamp(2rem, 5vw, 3.2rem); font-weight: 400; line-height: 1.35; margin-bottom: 28px; }
.page-head h1 b { font-weight: 700; }
.page-head p { max-width: 620px; color: var(--gray-6); font-size: 1rem; }

/* ===== WORK GRID (works.html / index excerpt) ===== */
.work-grid-section { padding: 64px 32px 100px; }
.work-grid-inner { max-width: 1080px; margin: 0 auto; }
.work-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px 32px;
}
.work-card { display: block; }
.work-card .visual { margin-bottom: 22px; transition: border-color .3s ease; }
.work-card:hover .visual { border-color: var(--gray-4); }
.work-card .tag-line { font-size: .76rem; letter-spacing: .14em; text-transform: uppercase; color: var(--gray-4); margin-bottom: 10px; }
.work-card h3 { font-size: 1.12rem; font-weight: 700; margin-bottom: 10px; letter-spacing: .01em; }
.work-card h3::after { content: '\2192'; display: inline-block; margin-left: 8px; opacity: 0; transform: translateX(-6px); transition: opacity .25s ease, transform .25s ease; }
.work-card:hover h3::after, .work-card:focus-visible h3::after { opacity: 1; transform: none; }
.work-card .desc { color: var(--gray-6); font-size: .88rem; margin-bottom: 14px; }
.work-card .tech-row { display: flex; flex-wrap: wrap; gap: 6px; }

/* ===== VISUAL (abstract patterns + photo) ===== */
.visual {
  aspect-ratio: 4 / 3; background: var(--bg); border: 1px solid var(--line);
  position: relative; overflow: hidden;
  display: flex; align-items: flex-end; justify-content: flex-start;
}
.visual .num {
  position: relative; z-index: 1; font-family: 'Times New Roman', serif;
  font-size: clamp(2.6rem, 6vw, 3.6rem); line-height: 1; padding: 20px 24px;
  color: var(--gray-2);
}
.visual.photo { align-items: stretch; justify-content: stretch; }
.visual.photo img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(1) contrast(1.08); transition: filter .5s ease, transform .5s ease; }
.visual.photo video { width: 100%; height: 100%; object-fit: cover; }
.work-card:hover .visual.photo img { filter: grayscale(0) contrast(1.02); transform: scale(1.03); }
.visual.photo .num { position: absolute; left: 0; bottom: 0; color: rgba(255,255,255,.65); text-shadow: 0 1px 6px rgba(0,0,0,.5); }

.visual.p1::after { content: ''; position: absolute; inset: 0; background-image: linear-gradient(var(--gray-1) 1px, transparent 1px), linear-gradient(90deg, var(--gray-1) 1px, transparent 1px); background-size: 28px 28px; opacity: .8; }
.visual.p2::after { content: ''; position: absolute; inset: 0; background-image: repeating-linear-gradient(45deg, var(--gray-2) 0 2px, transparent 2px 18px); opacity: .7; }
.visual.p3::after { content: ''; position: absolute; inset: 0; background-image: radial-gradient(var(--gray-2) 1.5px, transparent 1.5px); background-size: 20px 20px; opacity: .9; }
.visual.p4::after { content: ''; position: absolute; inset: 0; background-image: repeating-radial-gradient(circle at 30% 120%, transparent 0 22px, var(--gray-2) 22px 23px); opacity: .8; }
.visual.p5::after { content: ''; position: absolute; inset: 0; background-image: repeating-linear-gradient(90deg, var(--gray-2) 0 1px, transparent 1px 14px); opacity: .8; }
.visual.p6::after { content: ''; position: absolute; inset: 0; background: repeating-conic-gradient(var(--gray-1) 0% 25%, transparent 0% 50%) 0 0 / 24px 24px; opacity: .9; }
.visual.p7::after { content: ''; position: absolute; inset: 0; background-image: repeating-linear-gradient(-45deg, var(--gray-2) 0 1px, transparent 1px 9px), repeating-linear-gradient(45deg, var(--gray-2) 0 1px, transparent 1px 9px); opacity: .55; }

/* ===== WORK DETAIL ===== */
.detail-section { padding: 56px 32px 60px; }
.detail-inner { max-width: 1080px; margin: 0 auto; }
.detail-item { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.detail-visual .visual { aspect-ratio: 1 / 1; }
.detail-body .work-meta { font-size: .76rem; letter-spacing: .2em; text-transform: uppercase; color: var(--gray-4); margin-bottom: 18px; }
.detail-body h2 { font-size: clamp(1.6rem, 3.4vw, 2.2rem); font-weight: 700; margin-bottom: 16px; letter-spacing: .01em; }
.detail-body .role { font-size: .84rem; letter-spacing: .04em; color: var(--gray-6); margin-bottom: 24px; }
.detail-body > p { color: var(--gray-6); font-size: .96rem; margin-bottom: 26px; }
.feat-list { margin-bottom: 28px; }
.feat-list li { font-size: .9rem; color: var(--ink); padding: 9px 0 9px 26px; position: relative; border-top: 1px solid var(--line); }
.feat-list li:first-child { border-top: none; }
.feat-list li::before { content: '—'; position: absolute; left: 0; color: var(--gray-4); }
.tech-row { display: flex; flex-wrap: wrap; gap: 8px; }
.tech { font-size: .73rem; letter-spacing: .04em; color: var(--gray-6); border: 1px solid var(--gray-2); padding: 4px 12px; }

/* PREV / NEXT */
.detail-pager { max-width: 1080px; margin: 0 auto; padding: 0 32px 96px; display: flex; justify-content: space-between; border-top: 1px solid var(--line); padding-top: 32px; margin-top: 24px; }
.detail-pager a { font-size: .82rem; letter-spacing: .06em; color: var(--gray-6); text-transform: uppercase; }
.detail-pager a:hover { color: var(--black); }
.detail-pager .back { text-align: center; }

/* ===== ABOUT ===== */
.about-section { padding: 16px 32px 96px; }
.about-inner { max-width: 1080px; margin: 0 auto; display: grid; grid-template-columns: 220px 1fr; gap: 56px; }
.avatar { width: 160px; height: 160px; border-radius: 50%; background: var(--black); color: var(--paper); display: flex; align-items: center; justify-content: center; font-family: 'Times New Roman', serif; font-size: 3rem; }
.about-body p { color: var(--gray-6); font-size: .98rem; margin-bottom: 22px; max-width: 640px; }
.skill-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 40px; }
.skill { font-size: .78rem; letter-spacing: .04em; color: var(--ink); border: 1px solid var(--gray-2); padding: 6px 14px; }
.contact-box { background: var(--bg); border: 1px solid var(--line); padding: 40px; }
.contact-box h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 12px; }
.contact-box p { color: var(--gray-6); font-size: .9rem; margin-bottom: 24px; }

/* ===== MORE / CTA ===== */
.more { background: var(--bg); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 80px 32px; text-align: center; }
.more .inner { max-width: 640px; margin: 0 auto; }
.more h3 { font-size: clamp(1.4rem, 3vw, 1.9rem); font-weight: 400; margin-bottom: 16px; }
.more h3 b { font-weight: 700; }
.more p { color: var(--gray-6); margin-bottom: 36px; }

/* ===== FOOTER ===== */
footer { background: var(--bg); border-top: 1px solid var(--line); padding: 56px 32px 40px; }
.footer-inner { max-width: 1080px; margin: 0 auto; display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 32px; }
.footer-logo { font-family: 'Times New Roman', serif; font-size: 1.15rem; color: var(--black); }
.footer-nav { display: flex; gap: 36px; flex-wrap: wrap; }
.footer-nav a { font-size: .82rem; letter-spacing: .06em; color: var(--gray-6); text-transform: uppercase; }
.footer-nav a:hover { color: var(--black); }
.footer-bottom { max-width: 1080px; margin: 40px auto 0; padding-top: 24px; border-top: 1px solid var(--line); font-size: .76rem; color: var(--gray-4); letter-spacing: .04em; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .work-grid { grid-template-columns: repeat(2, 1fr); }
  .about-inner { grid-template-columns: 1fr; }
  .avatar { margin-bottom: 8px; }
}
@media (max-width: 760px) {
  .nav-burger { display: flex; }
  header nav { position: absolute; top: 72px; left: 0; right: 0; background: rgba(255,255,255,.97); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; gap: 0; padding: 8px 24px 24px; display: none; }
  header.nav-open nav { display: flex; }
  header nav a.nav-link { display: block; padding: 14px 0; border-bottom: 1px solid var(--line); font-size: .9rem; }
  header nav .nav-cta { margin-top: 20px; text-align: center; padding: 12px 20px; }
  .hero { padding: 80px 24px 64px; }
  .page-head { padding: 72px 24px 54px; }
  .work-grid-section { padding: 24px 24px 72px; }
  .work-grid { grid-template-columns: 1fr; }
  .detail-item { grid-template-columns: 1fr; gap: 28px; }
  .detail-section { padding: 40px 24px 24px; }
  .detail-pager { padding: 0 24px 72px; }
  .about-section { padding: 8px 24px 72px; }
}