/* =========================================================
   CTO Works — Corporate site
   Plain HTML + CSS, no JS, no build step.
   Mood: 文芸誌・文庫本の見開き / 和文組版を尊重
   ========================================================= */

/* ---------- Tokens ---------- */
:root {
  --paper:    #FAFAF7;
  --ink:      #1A1A1A;
  --ink-soft: #3A3A38;
  --rule:     #D8D5CC;
  --accent:   #6B4423;

  --serif-jp: 'Shippori Mincho', 'Hiragino Mincho ProN', 'YuMincho', 'Yu Mincho', serif;
  --sans-en:  'Inter', system-ui, -apple-system, sans-serif;

  --measure:  680px;       /* readable line length */
  --gutter:   clamp(20px, 5vw, 56px);
  --section-gap: clamp(96px, 14vw, 200px);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img, svg { max-width: 100%; display: block; }
a { color: inherit; }
ol, ul { list-style: none; padding: 0; margin: 0; }

html {
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif-jp);
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.06em;
  font-feature-settings: "palt" 1, "kern" 1;
  font-weight: 400;
  overflow-x: hidden;
}

/* Focus */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 250, 247, 0.86);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid transparent;
}

.header-inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 32px;
  padding: 22px var(--gutter);
  max-width: 1200px;
  margin: 0 auto;
}

.brand {
  font-family: var(--sans-en);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--ink);
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: clamp(20px, 3vw, 36px);
  font-family: var(--sans-en);
  font-weight: 400;
  font-size: 14px;
  letter-spacing: 0.04em;
}

.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  position: relative;
  padding-bottom: 2px;
  transition: color 200ms ease-out;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--ink);
  transition: right 280ms ease-out;
}

.site-nav a:hover { color: var(--ink); }
.site-nav a:hover::after { right: 0; }

/* ---------- Layout primitives ---------- */
main { display: block; }

section {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: var(--section-gap);
  padding-bottom: var(--section-gap);
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

/* deliberately offset insets — avoid grid-perfect alignment */
.hero      { padding-left: clamp(20px, 8vw, 96px);  padding-right: var(--gutter); }
.services  { padding-left: clamp(20px, 6vw, 72px);  padding-right: var(--gutter); }
.about     { padding-left: clamp(20px, 12vw, 160px);padding-right: var(--gutter); }
.profile   { padding-left: clamp(20px, 7vw, 88px);  padding-right: var(--gutter); }
.voice     { padding-left: clamp(20px, 10vw, 128px);padding-right: var(--gutter); }
.contact   { padding-left: clamp(20px, 9vw, 112px); padding-right: var(--gutter); }

/* Chapter index (01 — Hello) */
.chapter {
  font-family: var(--sans-en);
  font-weight: 400;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--ink-soft);
  margin: 0 0 clamp(40px, 6vw, 72px) 0;
  text-transform: uppercase;
}

/* Section heading */
.section-title {
  font-family: var(--serif-jp);
  font-weight: 600;
  font-size: clamp(24px, 3vw, 30px);
  letter-spacing: 0.08em;
  line-height: 1.6;
  margin: 0 0 clamp(28px, 4vw, 48px) 0;
  max-width: var(--measure);
}

/* Long horizontal rule (used between sections / between essays) */
.rule {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: clamp(48px, 8vw, 96px) 0;
  max-width: 100%;
}
.rule-long {
  margin-left: 0;
  margin-right: auto;
  width: min(640px, 100%);
}

/* ---------- Hero ---------- */
.hero {
  padding-top: clamp(120px, 18vw, 220px);
  padding-bottom: clamp(120px, 16vw, 200px);
}

.hero-title {
  font-family: var(--serif-jp);
  font-weight: 600;
  font-size: clamp(40px, 8vw, 88px);
  line-height: 1.4;
  letter-spacing: 0.04em;
  color: var(--ink);
  margin: 0 0 clamp(32px, 4vw, 56px) 0;
  max-width: 14em;
}

.hero-sub {
  font-family: var(--serif-jp);
  font-weight: 400;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 2.0;
  color: var(--ink-soft);
  margin: 0 0 clamp(56px, 8vw, 96px) 0;
  max-width: var(--measure);
}

.hero-def {
  font-family: var(--serif-jp);
  font-weight: 500;
  font-size: clamp(18px, 2.4vw, 26px);
  line-height: 1.8;
  letter-spacing: 0.06em;
  color: var(--ink);
  margin: 0 0 clamp(56px, 8vw, 96px) 0;
  max-width: var(--measure);
}

.hero-proof {
  font-family: var(--serif-jp);
  font-weight: 400;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 2.0;
  color: var(--ink-soft);
  margin: 0 0 clamp(56px, 8vw, 96px) 0;
  padding-left: 14px;
  border-left: 2px solid var(--accent);
  max-width: var(--measure);
}

.hero-link {
  margin: 0;
}

/* ---------- Merits (02 Why) ---------- */
.merit-list {
  display: flex;
  flex-direction: column;
  margin: 0;
  max-width: 760px;
}

.merit {
  display: flex;
  gap: clamp(20px, 4vw, 48px);
  align-items: baseline;
  border-top: 1px solid var(--rule);
  padding: clamp(32px, 5vw, 56px) 0;
}

.merit:last-child {
  border-bottom: 1px solid var(--rule);
}

.merit-no {
  font-family: var(--sans-en);
  font-weight: 400;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin: 0;
  flex: 0 0 2.5em;
}

.merit-inner { max-width: var(--measure); }

.merit-title {
  font-family: var(--serif-jp);
  font-weight: 600;
  font-size: clamp(19px, 2.2vw, 24px);
  letter-spacing: 0.06em;
  line-height: 1.7;
  margin: 0 0 14px 0;
  color: var(--ink);
}

.merit-body {
  font-family: var(--serif-jp);
  font-size: 16px;
  line-height: 2.0;
  color: var(--ink-soft);
  margin: 0;
}

.ink-link {
  font-family: var(--serif-jp);
  font-size: 16px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 2px;
  transition: border-color 220ms ease-out, color 220ms ease-out;
}
.ink-link span { font-family: var(--sans-en); margin-left: 6px; }
.ink-link:hover { color: var(--accent); }

/* ---------- Services ---------- */
.lead {
  font-size: 16px;
  line-height: 2.0;
  color: var(--ink-soft);
  margin: 0 0 clamp(40px, 6vw, 72px) 0;
  max-width: var(--measure);
}

.service-list {
  display: flex;
  flex-direction: column;
  gap: clamp(48px, 7vw, 80px);
  margin: clamp(8px, 2vw, 16px) 0;
}

.service {
  position: relative;
  padding-left: clamp(20px, 3vw, 32px);
  border-left: 2px solid var(--rule);
  max-width: var(--measure);
}

/* 主力サービスだけアクセント罫 + ひと回り大きい見出し */
.service--main {
  border-left: 3px solid var(--accent);
  padding-top: 4px;
  padding-bottom: 4px;
}

.service-title--main {
  font-size: clamp(22px, 2.6vw, 28px);
}

.service-meta {
  font-family: var(--sans-en);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 10px 0;
}

.service-title {
  font-family: var(--serif-jp);
  font-weight: 600;
  font-size: clamp(19px, 2.1vw, 23px);
  letter-spacing: 0.05em;
  line-height: 1.7;
  margin: 0 0 14px 0;
  color: var(--ink);
}

.service-catch {
  font-family: var(--serif-jp);
  font-weight: 500;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--ink);
  margin: 0 0 12px 0;
}

.service-body {
  font-family: var(--serif-jp);
  font-size: 16px;
  line-height: 2.0;
  color: var(--ink-soft);
  margin: 0;
}

.footnote {
  font-family: var(--serif-jp);
  font-size: 13px;
  line-height: 1.9;
  color: var(--ink-soft);
  opacity: 0.78;
  margin-top: clamp(40px, 6vw, 64px);
  max-width: var(--measure);
}

/* ---------- About / prose ---------- */
.prose {
  max-width: 640px;
}

.prose p {
  font-family: var(--serif-jp);
  font-size: 16px;
  line-height: 2.0;
  margin: 0 0 1.5em 0;
  color: var(--ink);
}

.prose p:last-child { margin-bottom: 0; }

/* ---------- Profile ---------- */
.profile-name {
  margin: 0 0 clamp(40px, 6vw, 72px) 0;
}

.name-jp {
  font-family: var(--serif-jp);
  font-weight: 600;
  font-size: clamp(36px, 6vw, 64px);
  letter-spacing: 0.18em;
  line-height: 1.4;
  margin: 0;
  color: var(--ink);
}

.name-en {
  font-family: var(--sans-en);
  font-weight: 400;
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
  margin: 12px 0 0 0;
}

.role {
  font-family: var(--serif-jp);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin: 24px 0 0 0;
}

/* ---------- Voice / essay ---------- */
.essay {
  max-width: var(--measure);
  margin: 0 0 clamp(8px, 2vw, 12px) 0;
}

.essay + .essay { margin-top: clamp(32px, 5vw, 56px); }

.essay-title {
  font-family: var(--serif-jp);
  font-weight: 600;
  font-size: clamp(18px, 2vw, 22px);
  letter-spacing: 0.08em;
  line-height: 1.7;
  margin: 0 0 18px 0;
  color: var(--ink);
}

.essay p {
  font-family: var(--serif-jp);
  font-size: 16px;
  line-height: 2.0;
  margin: 0;
  color: var(--ink);
}

/* ---------- Excerpt (実物引用) ---------- */
.excerpt-block {
  max-width: var(--measure);
  margin: 24px 0;
}

.excerpt-caption {
  font-family: var(--serif-jp);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  opacity: 0.8;
  margin: 0 0 12px 0;
}

.excerpt {
  border-left: 2px solid var(--accent);
  padding: 6px 0 6px 20px;
}

.excerpt p {
  font-family: var(--serif-jp);
  font-size: 15px;
  line-height: 2.0;
  color: var(--ink-soft);
  margin: 0 0 0.5em 0;
}

.excerpt p:last-child { margin-bottom: 0; }

/* ---------- 会社概要 ---------- */
.company-block {
  margin-top: clamp(48px, 7vw, 80px);
  max-width: var(--measure);
}

.company-heading {
  font-family: var(--serif-jp);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: 0.12em;
  margin: 0 0 20px 0;
  color: var(--ink);
}

.company {
  display: grid;
  grid-template-columns: 6em 1fr;
  gap: 8px 20px;
  font-family: var(--serif-jp);
  font-size: 14px;
  line-height: 1.9;
  margin: 0;
}

.company dt { color: var(--ink-soft); }
.company dd { margin: 0; color: var(--ink); }

/* ---------- Contact ---------- */
.email {
  margin: clamp(24px, 4vw, 40px) 0 clamp(28px, 5vw, 48px) 0;
}

.email a {
  font-family: var(--sans-en);
  font-weight: 400;
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 6px;
  transition: border-color 220ms ease-out;
}
.email a:hover { border-bottom-color: var(--accent); }

.contact-note {
  font-family: var(--serif-jp);
  font-size: 15px;
  line-height: 2.0;
  color: var(--ink-soft);
  margin: 0;
  max-width: var(--measure);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--rule);
  margin-top: clamp(80px, 12vw, 160px);
}

.footer-inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding: 28px var(--gutter);
  max-width: 1200px;
  margin: 0 auto;
  font-family: var(--sans-en);
  font-weight: 400;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.footer-inner a { color: var(--ink-soft); text-decoration: none; border-bottom: 1px solid transparent; }
.footer-inner a:hover { border-bottom-color: var(--ink-soft); }

/* ---------- Scroll-linked reveal (CSS only, view timeline) ---------- */
@supports (animation-timeline: view()) {
  .reveal {
    opacity: 0;
    transform: translateY(12px);
    animation: reveal-in 800ms ease-out both;
    animation-timeline: view();
    animation-range: entry 0% entry 60%;
  }
}

@keyframes reveal-in {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Fallback: browsers without animation-timeline keep content visible */
@supports not (animation-timeline: view()) {
  .reveal { opacity: 1; transform: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  :root { --section-gap: clamp(96px, 14vw, 160px); }
}

@media (max-width: 720px) {
  .header-inner { padding: 18px var(--gutter); }
  .site-nav { gap: 18px; font-size: 13px; }
  .brand { font-size: 13px; }

  .hero { padding-top: 96px; padding-bottom: 112px; }
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

@media (max-width: 480px) {
  body { font-size: 17px; }
  :root { --section-gap: 96px; }

  .hero-title { font-size: clamp(40px, 12vw, 48px); line-height: 1.45; }
  .hero-sub   { font-size: 16px; }

  .section-title { font-size: 22px; }
  .name-jp { font-size: 36px; letter-spacing: 0.14em; }
  .email a { font-size: 26px; }

  .service { padding-left: 18px; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1 !important; transform: none !important; }
}

/* ---------- Print (light niceness) ---------- */
@media print {
  .site-header, .site-footer { display: none; }
  body { background: #fff; color: #000; }
  section { padding: 24px 0; }
}