/* =================================================================
   KENSHO — architecture & real estate  (vol2 / Monochrome Editorial)
   ================================================================= */

/* ---------- Tokens ---------- */
:root {
  --ink: #0f0f0f;
  --ink-soft: #3a3a3a;
  --gray: #7c7c7c;
  --gray-2: #a9a7a1;
  --line: #d9d6cf;
  --line-strong: #b9b6ad;
  --paper: #f4f3ef;
  --paper-2: #ebe9e3;
  --white: #ffffff;
  --black: #0a0a0a;

  --sans: "Inter", "Noto Sans JP", system-ui, sans-serif;
  --jp: "Noto Sans JP", sans-serif;

  --maxw: 1280px;
  --gutter: clamp(20px, 5vw, 72px);
  --header-h: 76px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.85;
  font-size: 16px;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body.is-locked { overflow: hidden; height: 100vh; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ---------- Utilities ---------- */
.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.label {
  font-size: 0.72rem;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--gray);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.9em;
}
.label::before { content: ""; width: 26px; height: 1px; background: var(--ink); }
.label--plain::before { display: none; }

.h-display {
  font-family: var(--sans);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-size: clamp(2.6rem, 8vw, 6.5rem);
}
.h-sec {
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0.01em;
  font-size: clamp(1.7rem, 4vw, 2.9rem);
}
.jp { font-family: var(--jp); }
.lead { color: var(--ink-soft); font-weight: 400; max-width: 44em; }
.muted { color: var(--gray); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.9em;
  padding: 1.05em 2.1em;
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 500;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  border-radius: 0;
  transition: background 0.4s var(--ease), color 0.4s var(--ease);
}
.btn svg { width: 18px; height: 6px; transition: transform 0.4s var(--ease); }
.btn:hover { background: transparent; color: var(--ink); }
.btn:hover svg { transform: translateX(5px); }
.btn--ghost { background: transparent; color: var(--ink); }
.btn--ghost:hover { background: var(--ink); color: var(--paper); }
.btn--invert { background: var(--paper); color: var(--ink); border-color: var(--paper); }
.btn--invert:hover { background: transparent; color: var(--paper); }
.btn--ghost-light { background: transparent; color: var(--paper); border-color: rgba(255,255,255,0.45); }
.btn--ghost-light:hover { background: var(--paper); color: var(--ink); border-color: var(--paper); }

/* ---------- Brand mark (line house + K) ---------- */
.logo { display: flex; align-items: center; gap: 0.7rem; color: var(--ink); }
.logo__mark { width: 36px; height: 36px; flex: none; object-fit: contain; }
/* 暗い背景（ヒーロー上部・フッター）では黒ロゴを白に反転 */
.header.on-dark:not(.is-scrolled) .logo__mark { filter: invert(1); }
.footer .logo__mark { filter: invert(1); }
.logo__text { display: flex; flex-direction: column; line-height: 1; }
.logo__name { font-weight: 600; font-size: 1.02rem; letter-spacing: 0.42em; }
.logo__tag { font-size: 0.5rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--gray); margin-top: 0.35em; }

/* =================================================================
   Intro animation (opening line-draw)
   ================================================================= */
.intro {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: var(--paper);
  display: grid;
  place-items: center;
  transition: opacity 0.9s var(--ease), visibility 0.9s var(--ease), transform 1s var(--ease);
}
.intro.is-done { opacity: 0; visibility: hidden; transform: translateY(-3%); pointer-events: none; }
.intro__stage { width: min(560px, 84vw); text-align: center; }
.intro__scene { width: min(300px, 60vw); height: auto; overflow: visible; margin-inline: auto; display: block; }
/* ロゴの輪郭を線で描く → 塗りつぶして実ロゴになる */
.intro__scene .logoDraw {
  stroke: var(--ink);
  stroke-width: 14;          /* g scale(0.1) により実寸 約1.4px */
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: var(--ink);
  fill-opacity: 0;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  animation: logoStroke 2s var(--ease) 0.15s forwards,
             logoFill 0.7s var(--ease) 1.75s forwards;
}
@keyframes logoStroke { to { stroke-dashoffset: 0; } }
@keyframes logoFill { to { fill-opacity: 1; } }

.intro__word {
  margin-top: 2.2rem;
  font-weight: 600;
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  letter-spacing: 0.5em;
  padding-left: 0.5em;
  opacity: 0;
  animation: fadeUp 1s var(--ease) 2.25s forwards;
}
.intro__tag {
  margin-top: 0.9rem;
  font-size: 0.66rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--gray);
  opacity: 0;
  animation: fadeUp 1s var(--ease) 2.5s forwards;
}
.intro__skip {
  position: fixed;
  bottom: 1.6rem; right: 1.8rem;
  font-size: 0.66rem; letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--gray); cursor: pointer; background: none; border: 0;
  opacity: 0; animation: fadeUp 0.8s var(--ease) 0.6s forwards;
}
.intro__skip:hover { color: var(--ink); }
@keyframes fadeUp { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

/* =================================================================
   Header
   ================================================================= */
.header {
  position: fixed; inset: 0 0 auto 0; height: var(--header-h);
  z-index: 90; display: flex; align-items: center;
  border-bottom: 1px solid transparent;
  transition: background 0.4s var(--ease), border-color 0.4s var(--ease), height 0.4s var(--ease);
}
.header__inner { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); display: flex; align-items: center; justify-content: space-between; }
.header.is-scrolled { background: rgba(244,243,239,0.86); backdrop-filter: blur(10px); border-color: var(--line); height: 64px; }
/* hero (dark) header on home top */
.header.on-dark:not(.is-scrolled) .logo { color: var(--paper); }
.header.on-dark:not(.is-scrolled) .logo__tag { color: rgba(255,255,255,0.6); }
.header.on-dark:not(.is-scrolled) .nav__link { color: var(--paper); }
.header.on-dark:not(.is-scrolled) .nav-toggle span { background: var(--paper); }

.nav { display: flex; align-items: center; gap: clamp(1.4rem, 2.8vw, 2.8rem); }
.nav__link { position: relative; font-size: 0.78rem; letter-spacing: 0.16em; text-transform: uppercase; padding: 0.4em 0; color: var(--ink); }
.nav__link i { font-style: normal; display: block; font-size: 0.6rem; letter-spacing: 0.1em; color: var(--gray); margin-top: 0.2em; text-transform: none; }
.nav__link::after { content: ""; position: absolute; left: 0; bottom: -1px; width: 0; height: 1px; background: currentColor; transition: width 0.35s var(--ease); }
.nav__link:hover::after, .nav__link[aria-current="page"]::after { width: 100%; }
.nav__cta .btn { padding: 0.85em 1.5em; }

.nav-toggle { display: none; width: 42px; height: 42px; position: relative; background: none; border: 0; cursor: pointer; z-index: 110; }
.nav-toggle span { position: absolute; left: 9px; right: 9px; height: 1.6px; background: var(--ink); transition: 0.35s var(--ease); }
.nav-toggle span:nth-child(1) { top: 16px; }
.nav-toggle span:nth-child(2) { top: 21px; }
.nav-toggle span:nth-child(3) { top: 26px; }

/* =================================================================
   Hero
   ================================================================= */
.hero { position: relative; min-height: 100svh; display: flex; align-items: flex-end; background: var(--black); color: var(--paper); overflow: hidden; }
.hero__media { position: absolute; inset: 0; }
.hero__media img { width: 100%; height: 100%; object-fit: cover; filter: brightness(0.72); }
.hero__media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(10,10,10,0.45), rgba(10,10,10,0.2) 40%, rgba(10,10,10,0.82)); }
.hero__grid { position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,0.06) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.06) 1px, transparent 1px); background-size: 72px 72px; mask-image: radial-gradient(120% 80% at 50% 100%, #000, transparent 75%); }
.hero__inner { position: relative; z-index: 2; width: 100%; padding-bottom: clamp(3rem, 7vw, 6rem); padding-top: var(--header-h); }
.hero__meta { display: flex; justify-content: space-between; align-items: flex-end; gap: 2rem; border-top: 1px solid rgba(255,255,255,0.22); padding-top: 1.4rem; }
.hero__title { font-weight: 500; line-height: 1.12; letter-spacing: -0.01em; font-size: clamp(2.3rem, 6.4vw, 5.4rem); }
.hero__title .jp { font-weight: 500; font-size: clamp(1.9rem, 5vw, 4.4rem); }
.hero__sub { max-width: 30em; color: rgba(255,255,255,0.78); font-size: 0.98rem; }
.hero__index { font-size: 0.72rem; letter-spacing: 0.28em; color: rgba(255,255,255,0.6); }
.hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 2.4rem; }
.hero__scrollnote { position: absolute; left: var(--gutter); top: 50%; transform: rotate(180deg); writing-mode: vertical-rl; font-size: 0.62rem; letter-spacing: 0.3em; text-transform: uppercase; color: rgba(255,255,255,0.55); z-index: 2; }

/* =================================================================
   Marquee
   ================================================================= */
.marquee { border-block: 1px solid var(--line); overflow: hidden; padding: 1.1rem 0; background: var(--paper); }
.marquee__track { display: inline-flex; gap: 3rem; white-space: nowrap; animation: marquee 28s linear infinite; will-change: transform; }
.marquee span { font-size: clamp(1.2rem, 3vw, 2rem); font-weight: 500; letter-spacing: 0.06em; color: var(--ink); display: inline-flex; align-items: center; gap: 3rem; }
.marquee span::after { content: "—"; color: var(--gray-2); }
@keyframes marquee { to { transform: translateX(-50%); } }

/* =================================================================
   Sections
   ================================================================= */
.section { padding: clamp(5rem, 10vw, 9rem) 0; }
.section--paper2 { background: var(--paper-2); }
.section--dark { background: var(--black); color: var(--paper); }
.section--dark .lead { color: rgba(255,255,255,0.72); }
.section--dark .label { color: var(--gray-2); }
.section--dark .label::before { background: var(--paper); }
.section__head { display: grid; grid-template-columns: auto 1fr; gap: 1.4rem 2.4rem; align-items: end; margin-bottom: clamp(2.6rem, 5vw, 4.2rem); }
.section__head .idx { font-size: 0.72rem; letter-spacing: 0.28em; color: var(--gray); padding-bottom: 0.5rem; }

/* Stance / about split */
.stance { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(2.5rem, 6vw, 6rem); align-items: center; }
.stance__media { position: relative; }
.stance__media img { width: 100%; aspect-ratio: 4/5; object-fit: cover; }
.stance__media::before { content: ""; position: absolute; inset: -14px; border: 1px solid var(--line); z-index: -1; }
.stance__no { font-size: 0.72rem; letter-spacing: 0.28em; color: var(--gray); }

/* Services */
.works { display: grid; gap: clamp(2.5rem, 5vw, 4rem); }
.work {
  display: grid; grid-template-columns: 0.9fr 1.1fr; gap: clamp(1.8rem, 4vw, 4rem); align-items: center;
  padding-top: clamp(2.5rem, 5vw, 4rem); border-top: 1px solid var(--line);
}
.work:first-child { border-top: 0; padding-top: 0; }
.work--reverse .work__media { order: 2; }
.work__media { overflow: hidden; }
.work__media img { width: 100%; aspect-ratio: 16/11; object-fit: cover; transition: transform 0.8s var(--ease); }
.work:hover .work__media img { transform: scale(1.04); }
.work__no { font-size: clamp(2.4rem, 6vw, 4.5rem); font-weight: 500; line-height: 1; letter-spacing: -0.02em; color: var(--ink); }
.work__no small { display: block; font-size: 0.7rem; letter-spacing: 0.28em; text-transform: uppercase; color: var(--gray); margin-top: 0.8rem; font-weight: 500; }
.work__title { font-weight: 600; font-size: clamp(1.4rem, 3vw, 2.1rem); margin: 1.4rem 0 1rem; line-height: 1.4; }
.work__lead { color: var(--ink-soft); }
.tags { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.6rem; }
.tags li { font-size: 0.72rem; letter-spacing: 0.06em; border: 1px solid var(--line-strong); padding: 0.5em 1em; color: var(--ink-soft); }

/* Feature list (service page) */
.flist { margin-top: 1.8rem; display: grid; gap: 0; border-top: 1px solid var(--line); }
.flist li { display: grid; grid-template-columns: auto 1fr; gap: 1.2rem; padding: 1.1rem 0.2rem; border-bottom: 1px solid var(--line); align-items: baseline; }
.flist li b { font-weight: 600; white-space: nowrap; }
.flist li span { color: var(--ink-soft); font-size: 0.95rem; }

/* Strengths */
.strengths { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border: 1px solid rgba(255,255,255,0.16); }
.strength { padding: clamp(1.8rem, 3vw, 2.6rem); border-right: 1px solid rgba(255,255,255,0.16); }
.strength:last-child { border-right: 0; }
.strength__no { font-size: 0.72rem; letter-spacing: 0.28em; color: var(--gray-2); }
.strength__t { font-weight: 600; font-size: 1.2rem; margin: 1.6rem 0 0.8rem; }
.strength__d { color: rgba(255,255,255,0.7); font-size: 0.92rem; }

/* Philosophy */
.philo { text-align: center; max-width: 40em; margin-inline: auto; }
.philo__big { font-weight: 500; line-height: 1.45; letter-spacing: 0.01em; font-size: clamp(1.8rem, 5vw, 3.2rem); }
.philo__big .jp { font-weight: 500; }
.philo__d { margin-top: 2rem; color: var(--ink-soft); }

/* Message (CEO) */
.message { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: clamp(2.5rem, 6vw, 5rem); align-items: start; }
.message__media img { width: 100%; aspect-ratio: 3/4; object-fit: cover; }
.message__body p { color: var(--ink-soft); margin-bottom: 1.3em; }
.message__body .em { color: var(--ink); font-size: 1.18rem; font-weight: 500; line-height: 1.7; }
.message__sign { margin-top: 2rem; padding-top: 1.4rem; border-top: 1px solid var(--line); display: flex; align-items: baseline; gap: 0.9em; }
.message__sign small { color: var(--gray); letter-spacing: 0.16em; text-transform: uppercase; font-size: 0.66rem; }
.message__sign strong { font-size: 1.3rem; font-weight: 600; letter-spacing: 0.14em; }

/* Info table */
.info { width: 100%; border-collapse: collapse; border-top: 1px solid var(--line); }
.info th, .info td { text-align: left; vertical-align: top; padding: 1.3rem 0.4rem; border-bottom: 1px solid var(--line); font-size: 0.95rem; }
.info th { width: 26%; font-weight: 600; letter-spacing: 0.08em; white-space: nowrap; }
.info td { color: var(--ink-soft); }
.info td ul li { position: relative; padding-left: 1.2em; }
.info td ul li::before { content: ""; position: absolute; left: 0; top: 0.8em; width: 6px; height: 1px; background: var(--ink); }

/* Page hero */
.page-hero { padding: calc(var(--header-h) + 4.5rem) 0 3.5rem; border-bottom: 1px solid var(--line); }
.page-hero__title { font-weight: 500; font-size: clamp(2.2rem, 6vw, 4rem); letter-spacing: -0.01em; margin-top: 1.2rem; }
.page-hero__title .jp { display: block; font-size: clamp(1.2rem, 3vw, 1.8rem); color: var(--ink-soft); margin-top: 0.6rem; letter-spacing: 0.02em; }
.crumb { font-size: 0.72rem; letter-spacing: 0.16em; color: var(--gray); text-transform: uppercase; }
.crumb a:hover { color: var(--ink); }
.crumb span { margin: 0 0.6em; }

/* CTA */
.cta { background: var(--black); color: var(--paper); text-align: center; padding: clamp(4.5rem, 9vw, 7rem) 0; position: relative; overflow: hidden; }
.cta__grid { position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px); background-size: 64px 64px; mask-image: radial-gradient(80% 100% at 50% 0%, #000, transparent 80%); }
.cta__inner { position: relative; z-index: 2; }
.cta__t { font-weight: 500; font-size: clamp(1.7rem, 4.5vw, 3rem); line-height: 1.3; }
.cta__d { color: rgba(255,255,255,0.72); margin: 1.4rem auto 2.6rem; max-width: 34em; }
.cta__actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: clamp(2.5rem, 6vw, 5rem); align-items: start; }
.cinfo__item { padding: 1.3rem 0; border-bottom: 1px solid var(--line); }
.cinfo__item:first-child { border-top: 1px solid var(--line); }
.cinfo__l { font-size: 0.66rem; letter-spacing: 0.24em; text-transform: uppercase; color: var(--gray); }
.cinfo__v { font-size: 1.05rem; margin-top: 0.4em; }
.cinfo__v a:hover { color: var(--gray); }

.form { display: grid; gap: 1.4rem; }
.frow { display: grid; gap: 0.5rem; }
.frow--split { grid-template-columns: 1fr 1fr; gap: 1.4rem; }
.form label { font-size: 0.72rem; letter-spacing: 0.16em; text-transform: uppercase; font-weight: 500; }
.form label .req { color: var(--ink); margin-left: 0.4em; }
.form input, .form textarea, .form select {
  font-family: inherit; font-size: 0.98rem; padding: 0.9em 1em;
  border: 1px solid var(--line-strong); background: var(--white); color: var(--ink); border-radius: 0;
  transition: border-color 0.3s var(--ease);
}
.form input:focus, .form textarea:focus, .form select:focus { outline: none; border-color: var(--ink); }
.form textarea { resize: vertical; min-height: 150px; }
.form__note { font-size: 0.78rem; color: var(--gray); }
.form__submit { justify-self: start; cursor: pointer; }
.form__msg { display: none; padding: 1rem 1.2rem; border: 1px solid var(--ink); font-size: 0.9rem; }
.form__msg.is-show { display: block; }

/* =================================================================
   Footer
   ================================================================= */
.footer { background: var(--black); color: rgba(255,255,255,0.7); padding: clamp(3.5rem, 7vw, 5rem) 0 2rem; }
.footer__top { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 2.5rem; padding-bottom: 2.6rem; border-bottom: 1px solid rgba(255,255,255,0.14); }
.footer .logo { color: var(--paper); }
.footer .logo__tag { color: rgba(255,255,255,0.55); }
.footer__tagline { margin-top: 1.2rem; font-size: 0.88rem; max-width: 24em; }
.footer__col h4 { font-size: 0.66rem; letter-spacing: 0.24em; text-transform: uppercase; color: var(--gray-2); margin-bottom: 1.1rem; }
.footer__col ul { display: grid; gap: 0.7rem; }
.footer__col a { font-size: 0.9rem; }
.footer__col a:hover { color: var(--paper); }
.footer__bottom { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; padding-top: 1.8rem; font-size: 0.74rem; letter-spacing: 0.06em; color: rgba(255,255,255,0.5); }

/* ---------- Reveal ---------- */
[data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity 1s var(--ease), transform 1s var(--ease); }
[data-reveal].is-in { opacity: 1; transform: none; }
[data-reveal][data-delay="1"] { transition-delay: 0.1s; }
[data-reveal][data-delay="2"] { transition-delay: 0.2s; }
[data-reveal][data-delay="3"] { transition-delay: 0.3s; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .stance, .work, .work--reverse, .message, .contact-grid { grid-template-columns: 1fr; }
  .work--reverse .work__media { order: 0; }
  .strengths { grid-template-columns: 1fr; }
  .strength { border-right: 0; border-bottom: 1px solid rgba(255,255,255,0.16); }
  .strength:last-child { border-bottom: 0; }
  .footer__top { grid-template-columns: 1fr 1fr; }
  .message__media { max-width: 320px; }
  .hero__meta { flex-direction: column; align-items: flex-start; gap: 1.6rem; }
}
@media (max-width: 680px) {
  .nav-toggle { display: block; }
  .nav {
    position: fixed; inset: 0; flex-direction: column; align-items: stretch; justify-content: flex-start;
    gap: 0; padding: calc(var(--header-h) + 1.4rem) var(--gutter) 2.4rem;
    background: var(--paper); transform: translateX(100%); transition: transform 0.5s var(--ease); overflow-y: auto;
  }
  .nav.is-open { transform: none; }
  .nav__link { color: var(--ink) !important; font-size: 1.4rem; font-weight: 600; letter-spacing: 0.04em; text-transform: none; padding: 1.15rem 0.1rem; border-bottom: 1px solid var(--line); display: flex; align-items: baseline; gap: 0.8em; }
  .nav__link::after { content: none; }
  .nav__link i { display: inline; font-size: 0.66rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--gray); margin: 0; }
  .nav__cta { margin-top: 1.8rem; }
  .nav__cta .btn { width: 100%; justify-content: center; padding: 1.1em; }
  .header.on-dark:not(.is-scrolled) .nav__link { color: var(--ink) !important; }
  .nav-toggle[aria-expanded="true"] span { background: var(--ink) !important; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { top: 21px; transform: rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { top: 21px; transform: rotate(-45deg); }
  .footer__top { grid-template-columns: 1fr; }
  .frow--split { grid-template-columns: 1fr; }
  .section__head { grid-template-columns: 1fr; }
  .hero__scrollnote { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .intro { display: none; }
  .intro__scene .logoDraw { animation: none; stroke-dashoffset: 0; fill-opacity: 1; }
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .marquee__track { animation: none; }
}