/* AIヘルプキャプチャ LP
   方針: 余白と文字組みで見せる。アニメーション・トランジションは使わない。 */

:root {
  --bg: #ebe8e2;
  --bg-soft: #f4f2ee;
  --paper: #fbfaf8;
  --ink: #1a1a1a;
  --ink-2: #45433f;
  --muted: #7d7970;
  --line: #cdc8bf;
  --line-soft: #dcd8d0;
  --accent: #1f64d8;
  --dark: #151515;
  --dark-2: #222120;
  --dark-ink: #ecebe7;
  --dark-muted: #a19d95;
  --dark-line: #3a3936;

  --serif: "Cormorant Garamond", "Times New Roman", serif;
  --sans: "Zen Kaku Gothic New", "Hiragino Sans", "Yu Gothic UI", "Meiryo", sans-serif;

  --gutter: clamp(16px, 4vw, 56px);
  --max: 1280px;
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.9;
  font-feature-settings: "palt";
  letter-spacing: 0.04em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
p { margin: 0; }
h1, h2, h3 { margin: 0; font-weight: 700; word-break: auto-phrase; text-wrap: balance; }
ul, ol { margin: 0; padding: 0; list-style: none; }

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

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: var(--paper); padding: 8px 14px; z-index: 10;
}
.skip:focus { left: 8px; top: 8px; }

.wrap {
  width: 100%;
  max-width: calc(var(--max) + var(--gutter) * 2);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---------- Header ---------- */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 28px;
  padding-bottom: 28px;
}

.logotype {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.logotype img { width: 36px; height: 36px; }
.logotype span {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 22px;
  line-height: 0.95;
  letter-spacing: 0.01em;
}

.nav { display: flex; align-items: center; gap: clamp(20px, 3vw, 44px); }
.nav a {
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  color: var(--ink-2);
}
.nav a:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 6px; }
.nav a.btn { text-decoration: none; }
.nav a.btn-primary { color: var(--paper); }
.nav a.btn-ghost:hover { color: var(--paper); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  border: 1px solid var(--ink);
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: #000; }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); }
.btn-sm { min-height: 40px; padding: 0 20px; font-size: 13px; }
.btn svg { width: 16px; height: 16px; flex: none; }

.on-dark .btn-primary { background: var(--dark-ink); color: var(--dark); border-color: var(--dark-ink); }
.on-dark .btn-primary:hover { background: #fff; }

/* ---------- Hero ---------- */
.hero { padding-top: clamp(8px, 2vw, 24px); }

.wordmark {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(64px, 20.5vw, 330px);
  line-height: 0.86;
  letter-spacing: -0.025em;
  margin: 0 0 0 -0.04em;
  color: var(--ink);
  font-feature-settings: normal;
}
.wordmark .row { display: flex; align-items: flex-end; flex-wrap: wrap; gap: 0 0.18em; }
.wordmark .kana {
  font-family: var(--sans);
  font-size: clamp(12px, 1.3vw, 18px);
  font-weight: 500;
  letter-spacing: 0.2em;
  line-height: 1;
  color: var(--ink-2);
  padding-bottom: 0.9em;
}

.hero-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
  gap: 40px clamp(32px, 6vw, 96px);
  margin-top: clamp(40px, 6vw, 88px);
  align-items: end;
}
.hero-tag {
  font-family: var(--serif);
  font-size: 17px;
  font-style: italic;
  color: var(--muted);
  letter-spacing: 0.02em;
  align-self: end;
}
.hero-copy h1 {
  font-size: clamp(30px, 4.4vw, 60px);
  line-height: 1.38;
  letter-spacing: 0.04em;
  font-weight: 700;
}
.hero-copy .lead {
  margin-top: 28px;
  font-size: clamp(15px, 1.25vw, 17px);
  color: var(--ink-2);
  max-width: 34em;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
  margin-top: 36px;
}
.note { font-size: 12px; color: var(--muted); letter-spacing: 0.06em; }

.hero-shot {
  margin-top: clamp(56px, 8vw, 112px);
  border-top: 1px solid var(--line);
  padding-top: clamp(24px, 3vw, 40px);
}
.hero-shot figure { margin: 0; }
.frame {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: clamp(6px, 1vw, 12px);
}
.frame img { width: 100%; }
figcaption {
  margin-top: 14px;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.06em;
}

/* ---------- Section base ---------- */
.section { padding: clamp(88px, 12vw, 168px) 0; }
.section + .section { border-top: 1px solid var(--line); }

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: 24px clamp(32px, 6vw, 96px);
  margin-bottom: clamp(48px, 7vw, 96px);
}
.eyebrow {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink-2);
  font-feature-settings: normal;
}
.eyebrow .num { font-size: 15px; color: var(--muted); }
.section-head h2 {
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1.45;
  letter-spacing: 0.04em;
}
.section-head .sub {
  margin-top: 22px;
  color: var(--ink-2);
  max-width: 38em;
}

/* ---------- Problem ---------- */
.problems {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--ink);
}
.problems li {
  padding: 32px clamp(0px, 2vw, 32px) 8px 0;
}
.problems li + li { padding-left: clamp(20px, 2.5vw, 36px); border-left: 1px solid var(--line); }
.problems .q {
  font-size: clamp(18px, 1.7vw, 22px);
  font-weight: 700;
  line-height: 1.6;
}
.problems p:last-child { margin-top: 14px; color: var(--ink-2); font-size: 15px; }

.answer {
  margin-top: clamp(64px, 8vw, 104px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: 24px clamp(32px, 6vw, 96px);
}
.answer .mark {
  font-family: var(--serif);
  font-size: clamp(56px, 7vw, 104px);
  line-height: 0.8;
  color: var(--muted);
}
.answer p {
  word-break: auto-phrase;
  font-size: clamp(20px, 2.3vw, 30px);
  font-weight: 700;
  line-height: 1.7;
}

/* ---------- Steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  counter-reset: step;
}
.steps li {
  padding: 0 clamp(16px, 2vw, 28px) 0 0;
  border-top: 1px solid var(--ink);
}
.steps li + li { padding-left: clamp(16px, 2vw, 28px); }
.steps .n {
  display: block;
  font-family: var(--serif);
  font-size: clamp(56px, 6vw, 88px);
  line-height: 1;
  padding: 20px 0 16px;
  font-feature-settings: "lnum";
}
.steps h3 { font-size: 18px; line-height: 1.6; }
.steps p { margin-top: 10px; font-size: 15px; color: var(--ink-2); }

/* ---------- Output (anatomy) ---------- */
.anatomy {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 48px clamp(32px, 6vw, 96px);
  align-items: start;
}
.anatomy-list { counter-reset: a; border-top: 1px solid var(--ink); }
.anatomy-list li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.anatomy-list .k {
  font-family: var(--serif);
  font-size: 22px;
  line-height: 1.3;
  color: var(--muted);
}
.anatomy-list h3 { font-size: 17px; line-height: 1.6; }
.anatomy-list p { margin-top: 6px; font-size: 14px; color: var(--ink-2); }

/* ---------- Features ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--ink);
}
.features li {
  padding: 36px clamp(0px, 3vw, 48px) 40px 0;
  border-bottom: 1px solid var(--line);
}
.features li:nth-child(even) { padding-left: clamp(20px, 3vw, 48px); padding-right: 0; border-left: 1px solid var(--line); }
.features .label {
  font-family: var(--serif);
  font-size: 16px;
  color: var(--muted);
  letter-spacing: 0.04em;
  font-feature-settings: normal;
}
.features h3 { margin-top: 6px; font-size: clamp(19px, 1.8vw, 23px); line-height: 1.6; }
.features p { margin-top: 12px; color: var(--ink-2); font-size: 15px; }

.feature-shots {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: 24px;
  margin-top: clamp(48px, 6vw, 80px);
  align-items: start;
}
.feature-shots figure { margin: 0; }

/* ---------- Use cases ---------- */
.cases {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}
.cases li {
  background: var(--bg-soft);
  border: 1px solid var(--line-soft);
  padding: 28px 24px 30px;
}
.cases h3 { font-size: 17px; line-height: 1.6; }
.cases p { margin-top: 10px; font-size: 14px; color: var(--ink-2); }

/* ---------- Privacy (dark) ---------- */
.on-dark {
  background: var(--dark);
  color: var(--dark-ink);
}
.on-dark .section-head .sub,
.on-dark .eyebrow { color: var(--dark-muted); }
.on-dark .eyebrow .num { color: #77736c; }
.section.on-dark + .section { border-top: 0; }

.privacy-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--dark-line);
}
.privacy-grid li {
  padding: 32px clamp(0px, 2.5vw, 36px) 36px 0;
  border-bottom: 1px solid var(--dark-line);
}
.privacy-grid li:not(:nth-child(3n + 1)) { padding-left: clamp(20px, 2.5vw, 36px); border-left: 1px solid var(--dark-line); }
.privacy-grid h3 { font-size: 18px; line-height: 1.6; }
.privacy-grid p { margin-top: 10px; font-size: 14px; color: var(--dark-muted); }
.privacy-foot {
  margin-top: 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--dark-muted);
}
.privacy-foot a { color: var(--dark-ink); text-underline-offset: 5px; }

/* ---------- FAQ ---------- */
.faq { border-top: 1px solid var(--ink); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr) 24px;
  gap: 12px;
  align-items: baseline;
  padding: 24px 0;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  font-size: 17px;
  line-height: 1.6;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary .qm { font-family: var(--serif); font-size: 22px; color: var(--muted); font-weight: 500; }
.faq summary .pm { font-family: var(--serif); font-size: 26px; font-weight: 400; text-align: right; line-height: 1; }
.faq summary .pm::before { content: "+"; }
.faq details[open] summary .pm::before { content: "−"; }
.faq summary:hover { color: var(--ink-2); }
.faq .a {
  padding: 0 36px 28px 48px;
  color: var(--ink-2);
  font-size: 15px;
}
.faq .a p + p { margin-top: 10px; }

/* ---------- Final CTA ---------- */
.cta {
  padding: clamp(96px, 13vw, 176px) 0;
  text-align: left;
}
.cta .big {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(52px, 10vw, 152px);
  line-height: 0.9;
  letter-spacing: -0.02em;
  font-feature-settings: normal;
}
.cta-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
  gap: 32px clamp(32px, 6vw, 96px);
  margin-top: clamp(40px, 5vw, 64px);
  align-items: end;
}
.cta-body h2 { font-size: clamp(22px, 2.6vw, 32px); line-height: 1.6; }
.spec {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 20px;
  font-size: 13px;
  color: var(--ink-2);
  margin: 0;
}
.spec dt { color: var(--muted); }
.spec dd { margin: 0; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 40px 0 48px;
  font-size: 13px;
  color: var(--ink-2);
}
.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 40px;
  align-items: center;
  justify-content: space-between;
}
.foot-links { display: flex; flex-wrap: wrap; gap: 8px 28px; }
.foot-links a { text-decoration: none; }
.foot-links a:hover { text-decoration: underline; text-underline-offset: 5px; }
.copy { color: var(--muted); letter-spacing: 0.06em; }

/* ---------- Document page (privacy) ---------- */
.doc { padding: clamp(40px, 6vw, 88px) 0 clamp(88px, 10vw, 140px); }
.doc-inner { max-width: 760px; }
.doc h1 { font-size: clamp(28px, 3.6vw, 44px); line-height: 1.4; }
.doc .meta { margin-top: 16px; font-size: 13px; color: var(--muted); }
.doc h2 {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--ink);
  font-size: 20px;
  line-height: 1.6;
}
.doc p, .doc li { font-size: 15px; color: var(--ink-2); }
.doc p { margin-top: 16px; }
.doc ol, .doc ul { margin-top: 16px; padding-left: 1.4em; }
.doc ol { list-style: decimal; }
.doc ul { list-style: disc; }
.doc li + li { margin-top: 10px; }
.doc strong { color: var(--ink); }
.doc code {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.9em;
  background: var(--bg-soft);
  border: 1px solid var(--line-soft);
  padding: 1px 6px;
  word-break: break-all;
}
.table-scroll { margin-top: 16px; overflow-x: auto; }
.doc table { border-collapse: collapse; width: 100%; min-width: 480px; font-size: 14px; }
.doc th, .doc td { text-align: left; padding: 12px 14px 12px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.doc th { font-weight: 700; border-bottom-color: var(--ink); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 48px; }
  .steps li:nth-child(3) { padding-left: 0; }
  .cases { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .privacy-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .privacy-grid li:not(:nth-child(3n + 1)) { padding-left: 0; border-left: 0; }
  .privacy-grid li:nth-child(even) { padding-left: clamp(20px, 2.5vw, 36px); border-left: 1px solid var(--dark-line); }
}

@media (max-width: 860px) {
  .nav a:not(.btn) { display: none; }
  .hero-body,
  .section-head,
  .answer,
  .anatomy,
  .cta-body { grid-template-columns: minmax(0, 1fr); }
  .hero-tag { order: 2; }
  .problems { grid-template-columns: minmax(0, 1fr); }
  .problems li,
  .problems li + li { padding: 28px 0; border-left: 0; }
  .problems li + li { border-top: 1px solid var(--line); }
  .features { grid-template-columns: minmax(0, 1fr); }
  .features li,
  .features li:nth-child(even) { padding: 28px 0 32px; border-left: 0; }
  .feature-shots { grid-template-columns: minmax(0, 1fr); }
  .answer .mark { display: none; }
}

@media (max-width: 600px) {
  body { font-size: 15px; letter-spacing: 0.03em; }
  .site-header { padding-top: 18px; padding-bottom: 18px; }
  .logotype img { width: 30px; height: 30px; }
  .logotype span { font-size: 18px; }
  .wordmark .kana { flex-basis: 100%; padding: 14px 0 0 0.3em; }
  .hero-actions .btn { width: 100%; }
  .steps { grid-template-columns: minmax(0, 1fr); row-gap: 36px; }
  .steps li,
  .steps li + li,
  .steps li:nth-child(3) { padding: 0; }
  .steps .n { padding: 14px 0 8px; }
  .cases { grid-template-columns: minmax(0, 1fr); }
  .privacy-grid { grid-template-columns: minmax(0, 1fr); }
  .privacy-grid li,
  .privacy-grid li:nth-child(even) { padding: 26px 0 28px; border-left: 0; }
  .faq summary { grid-template-columns: 28px minmax(0, 1fr) 20px; font-size: 16px; padding: 20px 0; }
  .faq .a { padding: 0 0 24px 40px; }
  .cta .btn { width: 100%; }
}