/* SmartChair JP marketing — 方向 C「静寂 (Seijaku)」 */
/* Namespaced under .seijaku so it cannot leak into the rest of the app. */

.seijaku {
  --paper: #ffffff;
  --shoji: #f3f1ec;
  --sumi: #1c1c1c;
  --sumi-soft: #5a5a58;
  --rule: #dcdad3;
  --accent: #8a2a26;       /* shu-iro vermillion */
  --tea: #b89968;

  background: var(--paper);
  color: var(--sumi);
  font-family: "Noto Serif JP", "Source Serif 4", serif;
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
  text-rendering: geometricPrecision;
}

.seijaku *,
.seijaku *::before,
.seijaku *::after { box-sizing: border-box; }

.seijaku a { color: inherit; text-decoration: none; transition: color 150ms ease; }
.seijaku a:hover { color: var(--accent); }
.seijaku img { display: block; max-width: 100%; }

/* ---------- Top nav ---------- */
.seijaku .nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 64px;
}
.seijaku .brand {
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.seijaku .brand .mark-img { width: 30px; height: 30px; align-self: center; }
.seijaku .brand .name {
  font-family: "Noto Serif JP", serif;
  font-weight: 400;
  font-size: 20px;
  letter-spacing: 0.04em;
}
.seijaku .brand .ja {
  font-size: 12px;
  letter-spacing: 0.4em;
  color: var(--sumi-soft);
}
.seijaku .nav-links {
  display: flex;
  gap: 40px;
  font-family: "Noto Serif JP", serif;
  font-size: 13px;
  font-weight: 400;
  color: var(--sumi);
  letter-spacing: 0.18em;
}
.seijaku .nav-cta {
  font-family: "Noto Serif JP", serif;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--accent);
  border-bottom: 1px solid var(--accent);
  padding-bottom: 2px;
}

/* ---------- Hero ---------- */
.seijaku .hero {
  padding: 120px 64px 100px;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 80px;
  align-items: end;
  position: relative;
}
.seijaku .hero-tate {
  position: absolute;
  top: 60px;
  right: 64px;
  writing-mode: vertical-rl;
  font-family: "Noto Serif JP", serif;
  font-size: 12px;
  letter-spacing: 0.6em;
  color: var(--sumi-soft);
}
.seijaku .hero-num {
  font-family: "Inter", "Noto Serif JP", serif;
  font-size: 11px;
  letter-spacing: 0.4em;
  color: var(--accent);
  margin-bottom: 36px;
  text-transform: uppercase;
}
.seijaku h1.hero-title {
  font-family: "Noto Serif JP", serif;
  font-weight: 300;
  font-size: clamp(44px, 5.5vw, 76px);
  line-height: 1.3;
  letter-spacing: 0.02em;
  margin: 0 0 36px;
}
.seijaku h1.hero-title .em { color: var(--accent); }
.seijaku h1.hero-title .pause { color: var(--rule); margin: 0 6px; }
.seijaku .hero-en {
  font-family: "Source Serif 4", serif;
  font-style: italic;
  font-weight: 300;
  font-size: 18px;
  color: var(--sumi-soft);
  letter-spacing: 0.01em;
  margin: 0 0 48px;
  max-width: 44ch;
  line-height: 1.5;
}
.seijaku .hero-lede {
  font-size: 15px;
  line-height: 2;
  color: var(--sumi-soft);
  max-width: 36em;
  margin: 0 0 48px;
  font-weight: 400;
}
.seijaku .hero-actions {
  display: flex;
  gap: 28px;
  align-items: center;
  flex-wrap: wrap;
}
.seijaku .btn-primary {
  background: var(--sumi);
  color: var(--paper);
  padding: 16px 36px;
  font-family: "Noto Serif JP", serif;
  font-size: 13px;
  letter-spacing: 0.24em;
  display: inline-block;
  transition: background-color 150ms ease;
}
.seijaku .btn-primary:hover { background: #333; color: var(--paper); }
.seijaku .btn-ghost {
  font-family: "Noto Serif JP", serif;
  font-size: 13px;
  letter-spacing: 0.24em;
  color: var(--sumi);
  border-bottom: 1px solid var(--sumi);
  padding-bottom: 4px;
  display: inline-block;
}
.seijaku .btn-ghost:hover { color: var(--accent); border-bottom-color: var(--accent); }

.seijaku .hero-side {
  border-left: 1px solid var(--rule);
  padding: 8px 0 8px 32px;
}
.seijaku .hero-side .row {
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 13px;
}
.seijaku .hero-side .row:last-child { border-bottom: none; }
.seijaku .hero-side .lab {
  font-size: 10px;
  letter-spacing: 0.32em;
  color: var(--sumi-soft);
  display: block;
  margin-bottom: 6px;
  text-transform: uppercase;
}
.seijaku .hero-side .val {
  font-family: "Noto Serif JP", serif;
  font-size: 16px;
  color: var(--sumi);
}
.seijaku .hero-side .val em { color: var(--accent); font-style: normal; }

/* ---------- Section ---------- */
.seijaku .section {
  padding: 120px 64px;
  border-top: 1px solid var(--rule);
}
.seijaku .section.tinted { background: var(--shoji); }
.seijaku .sec-head {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 60px;
  margin-bottom: 80px;
  align-items: start;
}
.seijaku .sec-head .kanji {
  font-family: "Noto Serif JP", serif;
  font-weight: 300;
  font-size: 64px;
  line-height: 1;
  color: var(--sumi);
  letter-spacing: 0.05em;
}
.seijaku .sec-head .kanji .ac { color: var(--accent); }
.seijaku .sec-head .label {
  font-size: 10px;
  letter-spacing: 0.4em;
  color: var(--sumi-soft);
  margin-top: 12px;
}
.seijaku .sec-head h2 {
  font-family: "Noto Serif JP", serif;
  font-weight: 300;
  font-size: 32px;
  line-height: 1.5;
  margin: 0 0 16px;
  letter-spacing: 0.02em;
}
.seijaku .sec-head p {
  font-size: 14px;
  line-height: 1.95;
  color: var(--sumi-soft);
  max-width: 48ch;
  margin: 0;
}

/* ---------- Feature grid ---------- */
.seijaku .features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 64px 56px;
}
.seijaku .feat {
  display: flex;
  flex-direction: column;
}
.seijaku .feat .num {
  font-family: "Source Serif 4", serif;
  font-style: italic;
  font-weight: 300;
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.04em;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 18px;
}
.seijaku .feat h3 {
  font-family: "Noto Serif JP", serif;
  font-weight: 400;
  font-size: 19px;
  margin: 0 0 12px;
  letter-spacing: 0.02em;
}
.seijaku .feat p {
  font-size: 13.5px;
  line-height: 1.95;
  color: var(--sumi-soft);
  margin: 0;
}

/* ---------- Use cases (利用例) ---------- */
.seijaku .cases {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--rule);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.seijaku .case {
  background: var(--paper);
  padding: 36px 40px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.seijaku .case .case-meta {
  font-family: "Source Serif 4", serif;
  font-style: italic;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--accent);
}
.seijaku .case .case-name {
  font-family: "Noto Serif JP", serif;
  font-weight: 400;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--sumi);
}
.seijaku .case .case-when {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--sumi-soft);
  text-transform: uppercase;
}

/* ---------- Pricing (used on Plan + Top "価格" preview) ---------- */
.seijaku .pricing {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--rule);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.seijaku .plan {
  background: var(--paper);
  padding: 56px 48px;
}
.seijaku .plan.feat-plan { background: var(--shoji); }
.seijaku .plan-tag {
  font-size: 10px;
  letter-spacing: 0.36em;
  color: var(--sumi-soft);
  margin-bottom: 12px;
  text-transform: uppercase;
}
.seijaku .plan-name {
  font-family: "Noto Serif JP", serif;
  font-weight: 300;
  font-size: 36px;
  margin: 0 0 20px;
  letter-spacing: 0.04em;
}
.seijaku .plan-name .ac { color: var(--accent); }
.seijaku .plan-price {
  font-family: "Noto Serif JP", serif;
  font-weight: 300;
  font-size: 56px;
  line-height: 1;
  letter-spacing: 0.01em;
}
.seijaku .plan-price .yen { color: var(--accent); margin-right: 4px; }
.seijaku .plan-price small {
  font-size: 13px;
  color: var(--sumi-soft);
  margin-left: 10px;
  letter-spacing: 0.06em;
}
.seijaku .plan-formula {
  font-family: "Noto Serif JP", serif;
  font-size: 13px;
  margin: 14px 0 28px;
  color: var(--sumi-soft);
  padding-left: 16px;
  border-left: 2px solid var(--accent);
  line-height: 1.7;
}
.seijaku .plan ul { list-style: none; padding: 0; margin: 0 0 32px; }
.seijaku .plan li {
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 13.5px;
  line-height: 1.7;
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 12px;
}
.seijaku .plan li .lab {
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--sumi-soft);
  padding-top: 4px;
}

/* ---------- Security grid ---------- */
.seijaku .sec-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 60px 80px;
}
.seijaku .sec-item {
  border-top: 1px solid var(--sumi);
  padding-top: 20px;
}
.seijaku .sec-item .num {
  font-family: "Source Serif 4", serif;
  font-style: italic;
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 8px;
}
.seijaku .sec-item h4 {
  font-family: "Noto Serif JP", serif;
  font-weight: 400;
  font-size: 17px;
  margin: 0 0 10px;
  letter-spacing: 0.02em;
}
.seijaku .sec-item p {
  font-size: 13px;
  line-height: 1.85;
  color: var(--sumi-soft);
  margin: 0;
}

/* ---------- Footer (dark) ---------- */
.seijaku .footer {
  padding: 64px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 56px;
  font-size: 12px;
  color: rgba(244,238,226,0.55);
  background: var(--sumi);
  border-top: none;
}
.seijaku .footer .brand-block .footer-mark {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.seijaku .footer .brand-block .footer-mark img { width: 34px; height: 34px; }
.seijaku .footer .brand-block .footer-mark span {
  font-size: 13px;
  letter-spacing: 0.32em;
  color: var(--paper);
}
.seijaku .footer .brand-block .ja-big {
  font-family: "Noto Serif JP", serif;
  font-weight: 300;
  font-size: 28px;
  color: var(--paper);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.seijaku .footer .brand-block .org {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: rgba(244,238,226,0.6);
}
.seijaku .footer .brand-block .meta {
  font-size: 11px;
  color: rgba(244,238,226,0.45);
  margin-top: 14px;
  line-height: 1.8;
}
.seijaku .footer h4 {
  font-size: 10px;
  letter-spacing: 0.32em;
  color: var(--paper);
  margin: 0 0 14px;
  text-transform: uppercase;
}
.seijaku .footer ul { list-style: none; padding: 0; margin: 0; line-height: 2; }
.seijaku .footer ul li { color: rgba(244,238,226,0.6); }
.seijaku .footer ul li a:hover,
.seijaku .footer ul li:hover { color: var(--accent); }

/* ---------- Login (used by Login screen — kept for later phase) ---------- */
.seijaku .login-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
}
.seijaku .login-art {
  background: var(--shoji);
  padding: 64px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}
.seijaku .login-art .seal {
  position: absolute;
  top: 56px;
  right: 64px;
  width: 70px;
  height: 70px;
  border: 1px solid var(--rule);
  background: var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
}
.seijaku .login-art .ja-quote {
  font-family: "Noto Serif JP", serif;
  font-weight: 300;
  font-size: 30px;
  line-height: 1.7;
  color: var(--sumi);
  letter-spacing: 0.06em;
  margin: 0;
}
.seijaku .login-art .ja-quote .em { color: var(--accent); }
.seijaku .login-form {
  padding: 64px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* ---------- Prose / editorial column (legacy ports) ---------- */
.seijaku .prose {
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 2;
  color: var(--sumi);
}
.seijaku .prose p { margin: 0 0 1.4em; }
.seijaku .prose p:last-child { margin-bottom: 0; }
.seijaku .prose a { color: var(--accent); border-bottom: 1px solid var(--rule); }
.seijaku .prose a:hover { border-bottom-color: var(--accent); }
.seijaku .prose ul,
.seijaku .prose ol { padding-left: 1.4em; margin: 0 0 1.4em; }
.seijaku .prose li { margin-bottom: 0.6em; }
.seijaku .prose h3 {
  font-family: "Noto Serif JP", serif;
  font-weight: 400;
  font-size: 19px;
  letter-spacing: 0.02em;
  margin: 2em 0 0.8em;
}
.seijaku .prose h3:first-child { margin-top: 0; }
.seijaku .prose .signoff {
  font-style: italic;
  color: var(--sumi-soft);
  margin-top: 2em;
}

/* Definition-list pattern for contact / spec sheets */
.seijaku .deflist {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 14px 32px;
  font-size: 14px;
  line-height: 1.85;
  border-top: 1px solid var(--rule);
  padding-top: 24px;
  margin-top: 24px;
}
.seijaku .deflist dt {
  font-size: 10px;
  letter-spacing: 0.32em;
  color: var(--sumi-soft);
  text-transform: uppercase;
  padding-top: 6px;
}
.seijaku .deflist dd {
  margin: 0;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
  font-family: "Noto Serif JP", serif;
  color: var(--sumi);
}
@media (max-width: 767px) {
  .seijaku .deflist { grid-template-columns: 1fr; gap: 4px; }
  .seijaku .deflist dd { margin-bottom: 12px; }
}

/* ---------- Accessibility helper ---------- */
.seijaku .sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

/* ---------- Tablet 768–1023px ---------- */
@media (max-width: 1023px) {
  .seijaku .nav { padding: 22px 32px; }
  .seijaku .nav-links { gap: 24px; }
  .seijaku .hero {
    padding: 80px 32px 72px;
    grid-template-columns: 1fr;
    gap: 56px;
  }
  .seijaku .hero-tate { display: none; }
  .seijaku .hero-side { border-left: none; border-top: 1px solid var(--rule); padding: 24px 0 0; }
  .seijaku .section { padding: 80px 32px; }
  .seijaku .sec-head { grid-template-columns: 1fr; gap: 24px; margin-bottom: 56px; }
  .seijaku .features { grid-template-columns: repeat(2, 1fr); gap: 48px 40px; }
  .seijaku .pricing,
  .seijaku .cases { grid-template-columns: 1fr; }
  .seijaku .sec-grid { grid-template-columns: 1fr; gap: 40px; }
  .seijaku .footer { grid-template-columns: 1fr 1fr; gap: 40px; padding: 48px 32px; }
  .seijaku .login-wrap { grid-template-columns: 1fr; }
}

/* ---------- Mobile <768px ---------- */
@media (max-width: 767px) {
  .seijaku .nav { padding: 18px 22px; flex-wrap: wrap; gap: 16px; }
  .seijaku .nav-links { display: none; }
  .seijaku .nav-cta { font-size: 11px; }
  .seijaku .hero { padding: 56px 22px 48px; gap: 40px; }
  .seijaku h1.hero-title { font-size: 38px; line-height: 1.4; margin-bottom: 28px; }
  .seijaku .hero-en { font-size: 14px; margin-bottom: 32px; }
  .seijaku .hero-lede { font-size: 13px; line-height: 1.95; margin-bottom: 32px; }
  .seijaku .hero-actions { gap: 18px; }
  .seijaku .btn-primary { padding: 14px 28px; font-size: 12px; }
  .seijaku .section { padding: 56px 22px; }
  .seijaku .sec-head { margin-bottom: 40px; }
  .seijaku .sec-head .kanji { font-size: 48px; }
  .seijaku .sec-head h2 { font-size: 24px; }
  .seijaku .features { grid-template-columns: 1fr; gap: 32px; }
  .seijaku .plan { padding: 36px 24px; }
  .seijaku .plan-name { font-size: 28px; }
  .seijaku .plan-price { font-size: 44px; }
  .seijaku .footer { grid-template-columns: 1fr; gap: 32px; padding: 40px 22px; }
  .seijaku .login-wrap { grid-template-columns: 1fr; }
  .seijaku .login-art, .seijaku .login-form { padding: 40px 22px; }
}