/* ===========================================================
   大観総研 — TAIKAN SOKEN
   和モダン × エディトリアル
   =========================================================== */

:root {
  --sumi: #1c1a17;          /* 暖かい墨色 */
  --sumi-soft: #3a352f;
  --washi: #f7f4ee;         /* 生成り/和紙 */
  --washi-deep: #efe9df;
  --shu: #b8423d;           /* 落ち着いた朱 */
  --shu-deep: #97332f;
  --line: #d8cfc0;
  --muted: #6b645b;

  --serif: "Shippori Mincho", "Hiragino Mincho ProN", serif;
  --gothic: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", sans-serif;
  --en-serif: "Cormorant Garamond", serif;

  --maxw: 1120px;
  --gutter: clamp(1.25rem, 5vw, 4rem);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--washi);
  color: var(--sumi);
  font-family: var(--gothic);
  font-weight: 400;
  line-height: 1.9;
  letter-spacing: 0.04em;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.06em;
  margin: 0;
}

p { margin: 0; }

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

:focus-visible {
  outline: 2px solid var(--shu);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem var(--gutter);
  background: color-mix(in srgb, var(--washi) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}

.brand-jp {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.14em;
  white-space: nowrap;
}

.brand-en {
  font-family: var(--en-serif);
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  color: var(--muted);
  text-transform: uppercase;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  gap: clamp(0.9rem, 2.4vw, 2rem);
}

.site-nav a {
  position: relative;
  font-size: 0.9rem;
  letter-spacing: 0.14em;
  padding: 0.2rem 0;
  color: var(--sumi-soft);
  white-space: nowrap;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: var(--shu);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.35s ease;
}

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

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: min(92vh, 780px);
  padding: clamp(3rem, 10vh, 7rem) var(--gutter) clamp(4rem, 12vh, 8rem);
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-glyph {
  position: absolute;
  right: -0.08em;
  top: 50%;
  transform: translateY(-52%);
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(18rem, 46vw, 40rem);
  line-height: 1;
  color: var(--washi-deep);
  z-index: 0;
  user-select: none;
  pointer-events: none;
}

.hero-horizon {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 42%;
  z-index: 1;
  pointer-events: none;
}

.ridge {
  position: absolute;
  left: -5%;
  right: -5%;
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
  opacity: 0.9;
}

.ridge-1 {
  bottom: 0;
  height: 60%;
  background: color-mix(in srgb, var(--sumi) 8%, var(--washi));
}

.ridge-2 {
  bottom: 12%;
  height: 54%;
  left: 20%;
  right: -20%;
  background: color-mix(in srgb, var(--sumi) 12%, var(--washi));
}

.ridge-3 {
  bottom: 26%;
  height: 40%;
  left: -25%;
  right: 45%;
  background: color-mix(in srgb, var(--shu) 14%, var(--washi));
}

.hero-inner {
  position: relative;
  z-index: 2;
  max-width: var(--maxw);
  width: 100%;
  margin: 0 auto;
}

.hero-eyebrow {
  font-family: var(--en-serif);
  font-size: clamp(0.85rem, 1.6vw, 1.05rem);
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--shu-deep);
  margin-bottom: 1.6rem;
}

.hero-title {
  font-size: clamp(3.6rem, 13vw, 8.5rem);
  letter-spacing: 0.1em;
  margin-bottom: 1.2rem;
}

.hero-tagline {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.3rem, 3.6vw, 2.2rem);
  letter-spacing: 0.12em;
  margin-bottom: 2.2rem;
}

.hero-sub-vertical {
  writing-mode: vertical-rl;
  position: absolute;
  top: -1rem;
  right: 0;
  height: 12em;
  font-family: var(--serif);
  font-size: clamp(0.95rem, 1.6vw, 1.15rem);
  letter-spacing: 0.34em;
  color: var(--muted);
}

.hero-lead {
  max-width: 34em;
  font-size: clamp(0.95rem, 1.5vw, 1.05rem);
  color: var(--sumi-soft);
  border-left: 2px solid var(--shu);
  padding-left: 1.2rem;
}

/* ---------- Section base ---------- */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(4.5rem, 12vh, 9rem) var(--gutter);
  position: relative;
}

.section + .section { padding-top: 0; }

.section-head {
  display: flex;
  align-items: baseline;
  gap: 1.2rem;
  margin-bottom: clamp(2.4rem, 5vw, 3.6rem);
  padding-bottom: 1.4rem;
  border-bottom: 1px solid var(--line);
}

.section-num {
  font-family: var(--en-serif);
  font-size: 1rem;
  letter-spacing: 0.28em;
  color: var(--shu);
}

.section-title {
  font-size: clamp(2rem, 6vw, 3.4rem);
  letter-spacing: 0.18em;
}

/* JS有効時のみ初期非表示（no-JSでも全文が読める） */
.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ヒーロー内はロード時に順次表示 */
.hero .reveal.is-visible { transition-delay: 0s; }
.hero .reveal.d1 { transition-delay: 0.12s; }
.hero .reveal.d2 { transition-delay: 0.24s; }
.hero .reveal.d3 { transition-delay: 0.36s; }
.hero .reveal.d4 { transition-delay: 0.48s; }

/* ---------- About ---------- */
.about-body {
  max-width: 40em;
  margin-left: auto;
  display: grid;
  gap: 1.6rem;
  font-size: clamp(1rem, 1.5vw, 1.1rem);
}

.lead-line {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  letter-spacing: 0.08em;
  line-height: 1.7;
  color: var(--sumi);
}

/* ---------- Services ---------- */
.service-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(1.4rem, 3vw, 2.6rem);
}

.service-card {
  position: relative;
  padding: clamp(1.8rem, 3vw, 2.6rem) clamp(1.6rem, 2.6vw, 2.2rem);
  background: color-mix(in srgb, var(--washi-deep) 60%, var(--washi));
  border-top: 2px solid var(--sumi);
  transition: transform 0.4s ease, box-shadow 0.4s ease,
              opacity 0.8s ease;
}

.service-card:nth-child(even) {
  margin-top: clamp(0rem, 3vw, 2.4rem);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px -24px rgba(28, 26, 23, 0.5);
}

.service-index {
  font-family: var(--en-serif);
  font-style: italic;
  font-size: 1.3rem;
  letter-spacing: 0.1em;
  color: var(--shu);
}

.service-name {
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  letter-spacing: 0.08em;
  margin: 0.5rem 0 1rem;
}

.service-desc {
  font-size: 0.98rem;
  color: var(--sumi-soft);
}

/* ---------- Works ---------- */
.work-case {
  display: grid;
  gap: 1.8rem;
  max-width: 48em;
}

.work-tag {
  display: inline-block;
  justify-self: start;
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--shu-deep);
  border: 1px solid var(--shu);
  border-radius: 999px;
  padding: 0.35rem 1.1rem;
}

.work-headline {
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  letter-spacing: 0.06em;
  line-height: 1.5;
}

.work-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1.6rem, 5vw, 3.4rem);
  padding: 1.8rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.metric {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.metric-num {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3.2rem);
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--sumi);
}

.metric-unit {
  font-size: 0.42em;
  letter-spacing: 0.1em;
  margin-left: 0.15em;
  color: var(--muted);
}

.metric-label {
  font-size: 0.85rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.work-desc {
  font-size: clamp(1rem, 1.5vw, 1.08rem);
  color: var(--sumi-soft);
}

/* ---------- Profile ---------- */
.profile-body {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}

.profile-name {
  margin: 0;
}

.profile-name .vertical {
  writing-mode: vertical-rl;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  letter-spacing: 0.28em;
  color: var(--sumi);
  border-left: 2px solid var(--shu);
  padding-left: 0.8rem;
}

.profile-name-sr {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: 0.08em;
  margin-bottom: 1.2rem;
}

.profile-text {
  max-width: 40em;
  display: grid;
  gap: 1.4rem;
  font-size: clamp(1rem, 1.5vw, 1.08rem);
  color: var(--sumi-soft);
}

/* ---------- Contact ---------- */
.contact-body {
  display: grid;
  gap: 1.6rem;
  justify-items: start;
}

.contact-lead {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.4rem, 3.4vw, 2.2rem);
  letter-spacing: 0.08em;
}

.contact-mail {
  position: relative;
  font-family: var(--en-serif);
  font-size: clamp(1.4rem, 4vw, 2.4rem);
  letter-spacing: 0.06em;
  color: var(--shu-deep);
  padding-bottom: 0.25rem;
}

.contact-mail::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--shu);
  transform: scaleX(0.35);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.contact-mail:hover::after,
.contact-mail:focus-visible::after {
  transform: scaleX(1);
}

.contact-note {
  max-width: 34em;
  font-size: 0.98rem;
  color: var(--muted);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--sumi) 4%, var(--washi));
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(2.6rem, 6vw, 4rem) var(--gutter);
  display: grid;
  gap: 0.7rem;
}

.footer-brand {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 0.14em;
}

.footer-en {
  font-family: var(--en-serif);
  font-size: 0.8rem;
  letter-spacing: 0.28em;
  color: var(--muted);
  margin-left: 0.5rem;
}

.footer-meta,
.footer-copy {
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .service-grid { grid-template-columns: 1fr; }
  .service-card:nth-child(even) { margin-top: 0; }
  .about-body { margin-left: 0; }
  .hero-sub-vertical { display: none; }
}

@media (max-width: 600px) {
  body { letter-spacing: 0.02em; }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.55rem;
    padding: 0.8rem var(--gutter);
  }

  .brand { gap: 0.5rem; }
  .brand-jp { font-size: 1.1rem; letter-spacing: 0.1em; }
  .brand-en { font-size: 0.62rem; letter-spacing: 0.2em; }

  .site-nav {
    width: 100%;
    justify-content: space-between;
    gap: 0.2rem;
  }

  .site-nav a { font-size: 0.82rem; letter-spacing: 0.02em; }

  .hero { min-height: auto; padding-top: 2.5rem; }

  .hero-eyebrow {
    font-size: 0.68rem;
    letter-spacing: 0.14em;
    white-space: normal;
    word-break: break-word;
  }

  .hero-glyph { font-size: 24rem; opacity: 0.7; }

  .profile-body { grid-template-columns: 1fr; }

  .profile-name .vertical {
    writing-mode: horizontal-tb;
    border-left: none;
    border-bottom: 2px solid var(--shu);
    padding: 0 0 0.4rem 0;
  }
}