/* Kūki — washi paper and sumi ink. Tokens mirror Shared/Theme.swift. */

:root {
  color-scheme: light dark;
  --paper: #F3EFE6;
  --paper-raised: #EBE6DB;
  --ink: #22211F;
  --ink-rgb: 34, 33, 31;
  --ink-soft: rgba(var(--ink-rgb), 0.68);
  --ink-faint: rgba(var(--ink-rgb), 0.30);
  --hairline: rgba(var(--ink-rgb), 0.12);
  --matcha: #5F7D4C;
  --kincha: #A97A2C;
  --shu: #B23B26;
  --ai: #2E4868;
  --shadow: 0 1px 2px rgba(34, 33, 31, 0.06), 0 18px 40px -18px rgba(34, 33, 31, 0.28);
  --fiber-opacity: 0.55;

  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", "Segoe UI", Roboto, Arial, sans-serif;
  --mincho: "Hiragino Mincho ProN", "Hiragino Mincho Pro", "YuMincho", "Yu Mincho", "Noto Serif JP", "Noto Serif CJK JP", "Source Han Serif JP", serif;

  --measure: 34rem;
  --wide: 68rem;
  --gutter: 1.25rem;
  --radius: 1.25rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #121211;
    --paper-raised: #1B1B19;
    --ink: #E9E4D8;
    --ink-rgb: 233, 228, 216;
    --matcha: #93B27B;
    --kincha: #D5A95A;
    --shu: #E46B50;
    --ai: #93ADCD;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 18px 40px -18px rgba(0, 0, 0, 0.8);
    --fiber-opacity: 0.25;
  }
}

@media (prefers-contrast: more) {
  :root {
    --ink-soft: rgba(var(--ink-rgb), 0.85);
    --ink-faint: rgba(var(--ink-rgb), 0.55);
    --hairline: rgba(var(--ink-rgb), 0.30);
  }
}

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

html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Washi fibres: a faint, fixed grain — decoration only. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: var(--fiber-opacity);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9 0.035' numOctaves='2' seed='7'/%3E%3CfeColorMatrix values='0 0 0 0 0.45 0 0 0 0 0.42 0 0 0 0 0.36 0 0 0 0.09 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

img { max-width: 100%; height: auto; display: block; }

a { color: inherit; text-decoration-color: var(--ink-faint); text-underline-offset: 0.2em; text-decoration-thickness: 1px; }
a:hover { text-decoration-color: currentColor; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--ai); outline-offset: 3px; border-radius: 4px; }

.kanji { font-family: var(--mincho); font-weight: 300; }

.label {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 0.75rem;
}

.wrap { width: 100%; max-width: var(--wide); margin: 0 auto; padding: 0 var(--gutter); }
.measure { max-width: var(--measure); }

/* ——— Top bar ——— */
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1rem;
  padding-bottom: 1rem;
}
.brand { display: inline-flex; align-items: center; gap: 0.6rem; text-decoration: none; font-weight: 500; }
.brand img { width: 2rem; height: 2rem; border-radius: 22.5%; box-shadow: 0 0 0 0.5px var(--hairline); }
.brand .kanji { color: var(--ink-soft); font-size: 0.95rem; }
.top nav { display: flex; gap: 1.1rem; font-size: 0.9375rem; }
.top nav a { text-decoration: none; color: var(--ink-soft); }
.top nav a:hover, .top nav a[aria-current="page"] { color: var(--ink); }

/* ——— Hero ——— */
.hero { text-align: center; padding: 3.5rem 0 2.5rem; }
.hero-mark { display: inline-flex; align-items: flex-start; gap: 0.12em; font-size: clamp(4.5rem, 19vw, 8.5rem); line-height: 1; margin: 0; }
.hero-mark .kanji { letter-spacing: 0.02em; }
.seal { width: 0.17em; height: 0.17em; background: var(--shu); border-radius: 0.02em; margin-top: 0.08em; flex: none; }
.hero h1 { font-weight: 300; font-size: clamp(2.25rem, 7vw, 3.25rem); line-height: 1.1; margin: 1.25rem 0 0.5rem; letter-spacing: -0.01em; }
.tagline { font-size: clamp(1.25rem, 3.6vw, 1.6rem); font-weight: 300; margin: 0 auto 0.4rem; max-width: 24em; }
.sub { color: var(--ink-soft); margin: 0 auto; max-width: 30em; }

.cta { display: flex; flex-direction: column; align-items: center; gap: 0.9rem; margin-top: 2rem; }

/* App Store placeholder — swap for Apple's official badge + link once the app is live. */
.store-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.65rem 1.25rem 0.7rem;
  border-radius: 0.8rem;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  line-height: 1.15;
  text-align: left;
}
.store-badge small { display: block; font-size: 0.7rem; letter-spacing: 0.04em; opacity: 0.8; }
.store-badge strong { display: block; font-size: 1.15rem; font-weight: 500; }
.store-badge[aria-disabled="true"] { cursor: default; }
.store-badge svg { width: 1.6rem; height: 1.6rem; flex: none; }

.platforms { font-size: 0.875rem; color: var(--ink-soft); margin: 0; }
.platforms b { font-weight: 500; color: var(--ink); }
.platforms .sep { display: none; }
.platforms .works { display: block; }
@media (min-width: 40rem) {
  .platforms .sep { display: inline; margin: 0 0.4rem; }
  .platforms .works { display: inline; }
}

/* ——— Framed images ——— */
.frame {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow), 0 0 0 0.5px var(--hairline);
  background: var(--paper-raised);
}
.hero-gallery { margin-top: 3rem; }
figcaption { font-size: 0.875rem; color: var(--ink-soft); text-align: center; margin-top: 0.75rem; }

/* ——— Sections ——— */
section { padding: 4rem 0; }
.rule { border: 0; height: 0.5px; background: var(--hairline); margin: 0; }
h2 { font-weight: 300; font-size: clamp(1.75rem, 5vw, 2.4rem); line-height: 1.2; margin: 0 0 1rem; letter-spacing: -0.005em; }
h2 .kanji { display: block; font-size: 1.1rem; color: var(--ink-soft); margin-bottom: 0.5rem; letter-spacing: 0.1em; }
h3 { font-weight: 500; font-size: 1.125rem; margin: 0 0 0.35rem; }
p { margin: 0 0 1rem; }
.lead { font-size: 1.125rem; color: var(--ink-soft); }
.center { text-align: center; margin-left: auto; margin-right: auto; }

/* Works with — the bridge */
.bridge {
  list-style: none;
  padding: 0;
  margin: 2rem 0 1.5rem;
  display: grid;
  gap: 0.5rem;
  justify-items: center;
}
.bridge li { text-align: center; }
.node {
  display: inline-block;
  padding: 0.85rem 1.25rem;
  border-radius: 0.9rem;
  background: var(--paper-raised);
  box-shadow: 0 0 0 0.5px var(--hairline);
  min-width: 12rem;
}
.node b { display: block; font-weight: 500; }
.node span { font-size: 0.8125rem; color: var(--ink-soft); }
.node.kuki { background: var(--ink); color: var(--paper); }
.node.kuki span { color: var(--paper); opacity: 0.72; }
.link { font-size: 0.75rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-soft); }
.link::before { content: "↓"; display: block; font-size: 1rem; letter-spacing: 0; color: var(--ink-faint); }

@media (min-width: 52rem) {
  .bridge { grid-template-columns: auto auto auto auto auto; align-items: center; justify-content: center; gap: 1rem; }
  .link::before { content: "→"; }
}

/* The ensō: three pigments, three strokes */
.enso-row {
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem 1rem;
  text-align: center;
}
@media (min-width: 52rem) { .enso-row { grid-template-columns: repeat(4, 1fr); } }
.enso-row svg { width: 100%; max-width: 7.5rem; margin: 0 auto 0.75rem; display: block; overflow: visible; }
.enso-row .track { fill: none; stroke: var(--hairline); stroke-width: 1; }
.enso-row .stroke { fill: none; stroke-width: 7; stroke-linecap: round; }
.enso-row .ppm { font: 200 1.65rem/1 var(--sans); fill: var(--ink); font-variant-numeric: tabular-nums; }
.enso-row h3 { font-size: 1rem; display: flex; align-items: baseline; justify-content: center; gap: 0.35rem; }
.enso-row h3 .kanji { font-size: 1.15rem; }
.enso-row p { font-size: 0.875rem; color: var(--ink-soft); margin: 0; }
.matcha { color: var(--matcha); stroke: var(--matcha); }
.kincha { color: var(--kincha); stroke: var(--kincha); }
.shu { color: var(--shu); stroke: var(--shu); }
.fine { color: var(--ink); stroke: var(--ink); }

/* Spotlights: text + image */
.spot { display: grid; gap: 2rem; align-items: center; }
.spot .shots { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.spot ul { padding-left: 1.1rem; margin: 0 0 1rem; color: var(--ink-soft); }
.spot li { margin-bottom: 0.35rem; }
.phone { max-width: 20rem; margin: 0 auto; }
@media (min-width: 52rem) {
  .spot { grid-template-columns: 1fr 1fr; gap: 4rem; }
  .spot.mac { grid-template-columns: 2fr 3fr; }
  .spot.flip > :first-child { order: 2; }
}

/* Feature grid */
.features {
  list-style: none;
  padding: 0;
  margin: 2.5rem 0 0;
  display: grid;
  gap: 0;
}
.features li { padding: 1.4rem 0; border-top: 0.5px solid var(--hairline); display: grid; grid-template-columns: 3.25rem 1fr; gap: 0 0.75rem; }
.features .kanji { font-size: 1.6rem; line-height: 1.2; color: var(--ink-soft); }
.features p { margin: 0; color: var(--ink-soft); font-size: 0.975rem; }
@media (min-width: 44rem) {
  .features { grid-template-columns: 1fr 1fr; column-gap: 3rem; }
}
@media (min-width: 64rem) {
  .features { grid-template-columns: 1fr 1fr 1fr; }
}

/* Screenshot strip */
.strip {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: min(68vw, 15.5rem);
  gap: 1rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 1.5rem var(--gutter) 2rem;
  margin: 0 calc(-1 * var(--gutter));
  scrollbar-width: thin;
  scrollbar-color: var(--ink-faint) transparent;
}
.strip > * { scroll-snap-align: center; }
.strip.wide { grid-auto-columns: min(80vw, 22rem); }
@media (min-width: 72rem) {
  .strip { grid-auto-flow: row; grid-template-columns: repeat(5, 1fr); overflow: visible; margin: 0; padding: 1.5rem 0 2rem; }
  .strip.wide { grid-template-columns: repeat(3, 1fr); }
}

/* Honest note */
.note {
  border-left: 2px solid var(--kincha);
  padding: 0.25rem 0 0.25rem 1.25rem;
  margin: 2rem 0 0;
}
.note p { color: var(--ink-soft); margin: 0; }
.note b { color: var(--ink); font-weight: 500; }

/* Privacy trio */
.trio { list-style: none; padding: 0; margin: 1.5rem 0 1.5rem; display: flex; flex-wrap: wrap; justify-content: center; gap: 0.5rem 1.75rem; font-size: 1.25rem; font-weight: 300; }
.trio li::before { content: "無"; font-family: var(--mincho); color: var(--ink-faint); margin-right: 0.45rem; }

/* ——— Footer ——— */
footer { padding: 3rem 0 3.5rem; font-size: 0.875rem; color: var(--ink-soft); }
footer .row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem 2rem; align-items: center; margin-bottom: 1.5rem; }
footer nav { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; }
footer nav a { text-decoration: none; }
footer nav a:hover { color: var(--ink); }
.fine { font-size: 0.75rem; color: var(--ink-soft); max-width: 46rem; margin: 0; }

/* ——— Document pages (privacy, support) ——— */
.doc { padding: 3rem 0 2rem; }
.doc header { margin-bottom: 2.5rem; }
.doc h1 { font-weight: 300; font-size: clamp(2rem, 6vw, 2.75rem); line-height: 1.15; margin: 0 0 0.75rem; }
.doc h1 .kanji { display: block; font-size: 1.1rem; color: var(--ink-soft); letter-spacing: 0.1em; margin-bottom: 0.6rem; }
.doc h2 { font-size: 1.35rem; font-weight: 500; margin: 2.5rem 0 0.75rem; }
.doc .meta { color: var(--ink-soft); font-size: 0.9375rem; }
.doc ul { padding-left: 1.2rem; }
.doc li { margin-bottom: 0.5rem; }
.doc strong { font-weight: 600; }

.faq { margin: 0; }
.faq details { border-top: 0.5px solid var(--hairline); }
.faq details:last-of-type { border-bottom: 0.5px solid var(--hairline); }
.faq summary {
  list-style: none;
  cursor: pointer;
  padding: 1.15rem 2rem 1.15rem 0;
  font-weight: 500;
  position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "";
  position: absolute;
  right: 0.35rem;
  top: 50%;
  width: 0.5rem;
  height: 0.5rem;
  border-right: 1px solid var(--ink-soft);
  border-bottom: 1px solid var(--ink-soft);
  transform: translateY(-70%) rotate(45deg);
  transition: transform 0.2s ease-out;
}
.faq details[open] summary::after { transform: translateY(-30%) rotate(225deg); }
@media (prefers-reduced-motion: reduce) { .faq summary::after { transition: none; } }
.faq .answer { padding: 0 0 1.25rem; color: var(--ink-soft); }
.faq .answer p:last-child, .faq .answer ul:last-child { margin-bottom: 0; }
.faq .answer b, .faq .answer strong { color: var(--ink); font-weight: 500; }
.faq h2 { margin-top: 3rem; }

.contact {
  margin-top: 3rem;
  padding: 1.5rem;
  border-radius: var(--radius);
  background: var(--paper-raised);
  box-shadow: 0 0 0 0.5px var(--hairline);
}
.contact p:last-child { margin-bottom: 0; }

.button {
  display: inline-block;
  padding: 0.6rem 1.15rem;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9375rem;
  transition: transform 0.18s ease-out, opacity 0.18s ease-out;
}
.button:active { transform: scale(0.97); opacity: 0.7; }

kbd { font: inherit; font-size: 0.85em; padding: 0.05em 0.35em; border-radius: 0.3em; box-shadow: 0 0 0 0.5px var(--ink-faint); }

@media (max-width: 26rem) {
  .top nav { gap: 0.85rem; font-size: 0.875rem; }
  .brand .kanji { display: none; }
}

/* Mac section: text above, the real menu bar capture full width */
.mac-head { display: grid; gap: 1rem 4rem; margin-bottom: 2.5rem; }
.mac-head ul { padding-left: 1.1rem; margin: 0; color: var(--ink-soft); }
.mac-head li { margin-bottom: 0.4rem; }
.mac-shot { background: #121211; }
@media (min-width: 52rem) { .mac-head { grid-template-columns: 1fr 1fr; align-items: end; } }
.mac-pair { display: grid; gap: 1rem; margin-top: 0.5rem; }
@media (min-width: 52rem) { .mac-pair { grid-template-columns: 1fr 1fr; } }