/* ============================================================
   stilllife — brand site
   style.css
   全クラス: sl- prefix
   ============================================================ */

/* ---------- Variables ---------- */
.sl-body {
  --sl-bg:       #0f0e0d;
  --sl-surface:  #1c1a18;   /* bg より少し明るく、セクション差を明確に */
  --sl-ink:      #ede7dc;   /* 主テキスト：暖白をやや明るく */
  --sl-ink-dim:  #a89f94;   /* 副テキスト：変わらず */
  --sl-sub:      #7a6f63;   /* ラベル・最小文字：少し明るく可読性UP */
  --sl-rule:     #2e2924;   /* 罫線：少し明るく存在感を持たせる */
  --sl-warm:     #9a9088;   /* ウォームグレー mid */
  --sl-warm-lt:  #ccc0ae;   /* アクセント：少し明るく際立たせる */
  --sl-white:    #f0ece4;   /* BRAIN ノード背景 */
  --sl-brain-bg: #e8e2d8;   /* BRAIN ノード専用：柔らかいクリーム */

  --sl-font-serif: "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", serif;
  --sl-font-sans:  "Inter", "Helvetica Neue", Arial, sans-serif;

  --sl-max-w: 1080px;
  --sl-pad-x: 48px;
  --sl-ease:  cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset ---------- */
.sl-body *, .sl-body *::before, .sl-body *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.sl-body {
  background: var(--sl-bg);
  color: var(--sl-ink);
  font-family: var(--sl-font-serif);
  font-size: 15px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

.sl-body a { color: inherit; text-decoration: none; }
.sl-body ul, .sl-body ol { list-style: none; }

/* ---------- Container ---------- */
.sl-container {
  width: 100%;
  max-width: var(--sl-max-w);
  margin: 0 auto;
  padding: 0 var(--sl-pad-x);
}

/* ---------- Fade-in ---------- */
.sl-fade {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.9s var(--sl-ease), transform 0.9s var(--sl-ease);
}
.sl-fade.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- Shared ---------- */
.sl-eyebrow {
  display: block;
  font-family: var(--sl-font-sans);
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.28em;
  color: var(--sl-sub);
  text-transform: uppercase;
}

.sl-section {
  padding: 140px 0;
  border-top: 1px solid var(--sl-rule);
}

/* ============================================================
   HEADER
============================================================ */
.sl-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(15, 14, 13, 0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--sl-rule);
}

.sl-header-inner {
  max-width: var(--sl-max-w);
  margin: 0 auto;
  padding: 0 var(--sl-pad-x);
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sl-logo {
  font-family: var(--sl-font-serif);
  font-size: 15px;
  font-weight: 300;
  letter-spacing: 0.18em;
  color: var(--sl-ink);
  transition: color 0.2s;
}
.sl-logo:hover { color: var(--sl-warm-lt); }

.sl-nav {
  display: flex;
  align-items: center;
  gap: 40px;
}

.sl-nav-link {
  font-family: var(--sl-font-sans);
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.24em;
  color: var(--sl-sub);
  transition: color 0.2s;
}
.sl-nav-link:hover { color: var(--sl-warm-lt); }

/* ============================================================
   HERO
============================================================ */
.sl-hero {
  min-height: 100svh;
  display: flex;
  align-items: stretch;
  padding: 120px 0 80px;
  position: relative;
  overflow: hidden;
}

/* 背景の極薄テキスト */
.sl-hero::before {
  content: "stilllife";
  position: absolute;
  bottom: -0.18em;
  left: -0.04em;
  font-family: var(--sl-font-serif);
  font-size: clamp(120px, 18vw, 260px);
  font-weight: 300;
  color: rgba(255,255,255,0.025);
  letter-spacing: 0.06em;
  line-height: 1;
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
}

.sl-hero .sl-container {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  flex: 1;
  gap: 64px;
  position: relative;
  z-index: 1;
}

.sl-hero-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.sl-hero-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 32px;
}

.sl-hero-headline {
  font-family: var(--sl-font-serif);
  font-size: clamp(48px, 7.5vw, 96px);
  font-weight: 300;
  line-height: 1.3;
  letter-spacing: 0.08em;
  color: var(--sl-white);
}

.sl-hero-body {
  font-family: var(--sl-font-serif);
  font-size: clamp(13px, 1.4vw, 15px);
  font-weight: 300;
  line-height: 2;
  letter-spacing: 0.08em;
  color: var(--sl-ink-dim);
  max-width: 400px;
}

.sl-hero-foot {
  padding-top: 48px;
  border-top: 1px solid var(--sl-rule);
  display: flex;
  justify-content: flex-end;
}

.sl-hero-note {
  font-family: var(--sl-font-sans);
  font-size: 9px;
  letter-spacing: 0.22em;
  color: var(--sl-sub);
}

/* ============================================================
   ABOUT
============================================================ */
.sl-about { background: var(--sl-bg); }

.sl-about-inner {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 80px;
  align-items: start;
}

.sl-about-left {
  padding-top: 8px;
}

.sl-about-headline {
  font-family: var(--sl-font-serif);
  font-size: clamp(22px, 3vw, 36px);
  font-weight: 300;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--sl-white);
  margin-bottom: 48px;
}

.sl-about-body {
  font-family: var(--sl-font-serif);
  font-size: 14px;
  line-height: 2.2;
  letter-spacing: 0.04em;
  color: var(--sl-ink-dim);
  margin-bottom: 20px;
}
.sl-about-body:last-child { margin-bottom: 0; }

/* ============================================================
   OUR ROLE
============================================================ */
.sl-role { background: var(--sl-surface); }

.sl-role-inner {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.sl-role-header {
  display: flex;
  flex-direction: column;
  gap: 28px;
  margin-bottom: 56px;
}

.sl-role-headline {
  font-family: var(--sl-font-serif);
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 300;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--sl-white);
  max-width: 560px;
}

.sl-role-body {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.sl-role-desc {
  font-family: var(--sl-font-serif);
  font-size: 14px;
  line-height: 2.2;
  letter-spacing: 0.04em;
  color: var(--sl-ink-dim);
  max-width: 560px;
  width: 100%;
  margin-bottom: 80px;
}

.sl-role-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  width: 100%;
}

.sl-role-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 180px;
  height: 180px;
  border: 1px solid var(--sl-rule);
  background: var(--sl-bg);
  flex-shrink: 0;
  text-align: center;
  transition: border-color 0.3s;
}

.sl-role-node--brain {
  width: 220px;
  height: 220px;
  background: var(--sl-brain-bg);
  border-color: var(--sl-brain-bg);
}

.sl-role-en {
  font-family: var(--sl-font-sans);
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.32em;
  color: var(--sl-sub);
  display: block;
}
.sl-role-node--brain .sl-role-en {
  color: #8a7e72;
}

.sl-role-ja {
  font-family: var(--sl-font-serif);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--sl-ink-dim);
  display: block;
}
.sl-role-node--brain .sl-role-ja {
  color: var(--sl-bg);
  font-size: 17px;
  font-weight: 500;
}

.sl-role-conn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 40px;
  max-width: 100px;
}

.sl-role-verb {
  font-family: var(--sl-font-sans);
  font-size: 7px;
  letter-spacing: 0.18em;
  color: var(--sl-sub);
  opacity: 0.5;
  text-transform: lowercase;
  white-space: nowrap;
}

.sl-role-line {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--sl-rule);
  position: relative;
}
.sl-role-line::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -3px;
  border: 4px solid transparent;
  border-left-color: var(--sl-rule);
}

@media (max-width: 860px) {
  .sl-role-node { width: 140px; height: 140px; }
  .sl-role-node--brain { width: 170px; height: 170px; }
  .sl-role-ja { font-size: 13px; }
  .sl-role-node--brain .sl-role-ja { font-size: 15px; }
}

@media (max-width: 600px) {
  .sl-role-node { width: 96px; height: 96px; gap: 8px; }
  .sl-role-node--brain { width: 118px; height: 118px; }
  .sl-role-ja { font-size: 11px; }
  .sl-role-node--brain .sl-role-ja { font-size: 12px; }
  .sl-role-en { font-size: 7px; letter-spacing: 0.2em; }
  .sl-role-conn { min-width: 20px; }
}

/* ============================================================
   SERVICE
============================================================ */
.sl-service { background: var(--sl-bg); }

.sl-service-header {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 72px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--sl-rule);
}

.sl-service-heading-en {
  font-family: var(--sl-font-serif);
  font-size: clamp(28px, 4.5vw, 56px);
  font-weight: 300;
  letter-spacing: 0.1em;
  color: var(--sl-white);
  line-height: 1.2;
}

.sl-service-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.sl-service-tagline {
  font-family: var(--sl-font-serif);
  font-size: clamp(18px, 2.4vw, 26px);
  font-weight: 400;
  line-height: 1.65;
  letter-spacing: 0.06em;
  color: var(--sl-white);
  margin-bottom: 32px;
}

.sl-service-desc {
  font-family: var(--sl-font-serif);
  font-size: 13px;
  line-height: 2.1;
  letter-spacing: 0.04em;
  color: var(--sl-ink-dim);
  margin-bottom: 16px;
}
.sl-service-desc:last-of-type { margin-bottom: 40px; }

.sl-service-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--sl-font-sans);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.16em;
  color: var(--sl-warm-lt);
  border-bottom: 1px solid var(--sl-sub);
  padding-bottom: 3px;
  transition: color 0.2s, border-color 0.2s;
}
.sl-service-link:hover {
  color: var(--sl-white);
  border-color: var(--sl-warm-lt);
}

/* モジュールリスト */
.sl-service-modules {
  display: flex;
  flex-direction: column;
  margin-bottom: 40px;
}

.sl-service-module {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 20px;
  padding: 20px 0;
  border-top: 1px solid var(--sl-rule);
  align-items: start;
}
.sl-service-module:last-child { border-bottom: 1px solid var(--sl-rule); }

.sl-module-num {
  font-family: var(--sl-font-sans);
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.16em;
  color: var(--sl-sub);
  padding-top: 4px;
}

.sl-module-title {
  font-family: var(--sl-font-serif);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--sl-ink);
  margin-bottom: 4px;
  line-height: 1.4;
}

.sl-module-desc {
  font-family: var(--sl-font-serif);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--sl-sub);
  line-height: 1.7;
}

/* メタ情報 */
.sl-service-meta {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--sl-rule);
  padding-top: 24px;
}

.sl-meta-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--sl-rule);
  gap: 16px;
}

.sl-meta-label {
  font-family: var(--sl-font-sans);
  font-size: 8px;
  font-weight: 400;
  letter-spacing: 0.24em;
  color: var(--sl-sub);
  white-space: nowrap;
}

.sl-meta-val {
  font-family: var(--sl-font-serif);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--sl-ink-dim);
  text-align: right;
}

/* ============================================================
   PHILOSOPHY
============================================================ */
.sl-philosophy {
  background: var(--sl-bg);
  padding: 160px 0;
}

.sl-philosophy-inner {
  max-width: 800px;
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.sl-philosophy-quote {
  border: none;
  padding: 0;
}

.sl-philosophy-quote p {
  font-family: var(--sl-font-serif);
  font-size: clamp(22px, 3.2vw, 38px);
  font-weight: 300;
  line-height: 1.75;
  letter-spacing: 0.07em;
  color: var(--sl-white);
}

.sl-philosophy-body {
  font-family: var(--sl-font-serif);
  font-size: 14px;
  line-height: 2.2;
  letter-spacing: 0.04em;
  color: var(--sl-ink-dim);
  max-width: 600px;
  padding-top: 16px;
  border-top: 1px solid var(--sl-rule);
}

/* ============================================================
   CONTACT
============================================================ */
.sl-contact {
  background: var(--sl-surface);
  padding: 160px 0;
}

.sl-contact-inner {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.sl-contact-inner .sl-eyebrow {
  margin-bottom: 40px;
}

.sl-contact-headline {
  font-family: var(--sl-font-serif);
  font-size: clamp(28px, 4.5vw, 56px);
  font-weight: 300;
  line-height: 1.55;
  letter-spacing: 0.07em;
  color: var(--sl-white);
  margin-bottom: 64px;
}

.sl-contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--sl-font-sans);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.18em;
  color: var(--sl-bg);
  background: var(--sl-warm);
  padding: 18px 44px;
  transition: background 0.25s, color 0.25s;
  align-self: flex-start;
}
.sl-contact-btn:hover {
  background: var(--sl-warm-lt);
}

/* ============================================================
   FOOTER
============================================================ */
.sl-footer {
  background: var(--sl-bg);
  border-top: 1px solid var(--sl-rule);
  padding: 36px 0;
}

.sl-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sl-footer-brand {
  font-family: var(--sl-font-serif);
  font-size: 13px;
  font-weight: 300;
  letter-spacing: 0.18em;
  color: var(--sl-sub);
}

.sl-footer-copy {
  font-family: var(--sl-font-sans);
  font-size: 9px;
  letter-spacing: 0.12em;
  color: var(--sl-rule);
  color: #3a342e;
}

/* ============================================================
   RESPONSIVE — Tablet (≤ 860px)
============================================================ */
@media (max-width: 860px) {
  .sl-body { --sl-pad-x: 32px; }
  .sl-section { padding: 100px 0; }

  .sl-about-inner { grid-template-columns: 1fr; gap: 36px; }
  .sl-service-body { grid-template-columns: 1fr; gap: 64px; }

  .sl-nav { gap: 28px; }
}

/* ============================================================
   RESPONSIVE — Mobile (≤ 600px)
============================================================ */
@media (max-width: 600px) {
  .sl-body { --sl-pad-x: 24px; }
  .sl-section { padding: 80px 0; }

  .sl-hero { padding: 96px 0 64px; }
  .sl-hero::before { font-size: 80px; }
  .sl-hero-top { flex-direction: column; gap: 4px; }

  .sl-philosophy { padding: 100px 0; }
  .sl-contact { padding: 100px 0; }

  .sl-footer-inner { flex-direction: column; gap: 12px; text-align: center; }

  .sl-nav { gap: 20px; }
}