/* Kanso — kanso.ink
   Japanese-minimal: washi off-white / sumi near-black, lots of space,
   one red accent, and dot-matrix details drawn with CSS and inline SVG.
   No web fonts: system UI faces only (nothing to download or track). */

:root {
  --paper: #f6f4ef;
  --paper-2: #eeebe4;
  --card: #fbfaf7;
  --ink: #0e0e0e;
  --ink-2: #56534d;
  --rule: #dedad1;
  /* Brand vermilion for dots and graphics; a darker tone for small text on light paper (5.6:1). */
  --red: #e34234;
  --red-text: #b5301f;
  --dot: rgb(14 14 14 / 0.13);

  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Helvetica Neue", Arial,
    "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, "Cascadia Mono", "Roboto Mono", Menlo, Consolas, monospace;

  --wrap: 70rem;
  --measure: 40rem;
  --gutter: clamp(1.25rem, 5vw, 3rem);
  --space: clamp(4rem, 11vw, 8.5rem);
  --radius: 1.75rem;

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0e0e0e;
    --paper-2: #161615;
    --card: #141413;
    --ink: #eceae4;
    --ink-2: #a19e97;
    --rule: #2a2927;
    --red: #e34234;
    --red-text: #e34234;
    --dot: rgb(236 234 228 / 0.12);
  }
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.7 var(--font);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
  text-decoration-color: color-mix(in srgb, currentColor 40%, transparent);
}

a:hover {
  text-decoration-color: var(--red);
}

:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: color-mix(in srgb, var(--red) 22%, transparent);
}

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 10;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: var(--paper);
  border-radius: 999px;
  text-decoration: none;
}

.skip:focus {
  top: 1rem;
}

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

/* ---------- Header & footer ---------- */

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 2rem;
  padding-block: 1.75rem;
}

.brand {
  display: inline-flex;
  padding: 0.35rem 0;
  color: var(--ink);
}

.wordmark {
  height: 1.2rem;
  width: auto;
}

.site-nav ul,
.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a,
.footer-nav a {
  display: inline-block;
  padding-block: 0.35rem;
  color: var(--ink-2);
  font-size: 0.9375rem;
  text-decoration: none;
}

.site-nav a:hover,
.footer-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
}

.site-nav a[aria-current="page"] {
  background: radial-gradient(circle, var(--red) 2.5px, transparent 3px) center bottom / 6px 6px no-repeat;
}

.site-footer {
  margin-top: var(--space);
  border-top: 1px solid var(--rule);
  padding-block: 2.5rem 3rem;
  color: var(--ink-2);
  font-size: 0.875rem;
}

.footer-grid {
  display: grid;
  gap: 1.25rem;
}

.footer-grid p {
  margin: 0;
}

.footer-brand {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  color: var(--ink);
}

.footer-brand span[lang="ja"] {
  color: var(--ink-2);
  letter-spacing: 0.2em;
}

/* ---------- Type ---------- */

h1,
h2,
h3 {
  margin: 0 0 0.6em;
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.35rem, 6.2vw, 4.25rem);
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.6rem, 3.4vw, 2.25rem);
}

h3 {
  font-size: 1.1875rem;
  font-weight: 500;
  letter-spacing: -0.005em;
}

p {
  margin: 0 0 1em;
}

.lede {
  max-width: 34rem;
  color: var(--ink-2);
  font-size: clamp(1.125rem, 2.2vw, 1.3125rem);
  line-height: 1.6;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 1.5rem;
  color: var(--ink-2);
  font: 500 0.75rem/1.4 var(--mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--red);
  flex: none;
}

.muted {
  color: var(--ink-2);
}

.fine {
  color: var(--ink-2);
  font-size: 0.875rem;
}

/* ---------- Buttons ---------- */

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.75rem;
  margin-top: 2.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  min-height: 3rem;
  padding: 0.8rem 1.45rem 0.8rem 1.2rem;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  font-weight: 500;
  text-decoration: none;
  transition: background-color 0.15s ease;
}

.btn::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--red);
  flex: none;
}

.btn:hover {
  background: color-mix(in srgb, var(--ink) 86%, var(--red));
}

.link-arrow {
  font-weight: 500;
  text-decoration: none;
}

.link-arrow::after {
  content: " →";
  color: var(--red-text);
}

.link-arrow:hover {
  text-decoration: underline;
}

/* ---------- Dot-matrix accents ---------- */

/* A field of dots that fades out — the studio's quiet signature. */
.dotfield {
  background-image: radial-gradient(circle, var(--dot) 1.3px, transparent 1.8px);
  background-size: 14px 14px;
  -webkit-mask-image: radial-gradient(ellipse at 70% 40%, #000 0%, transparent 70%);
  mask-image: radial-gradient(ellipse at 70% 40%, #000 0%, transparent 70%);
  pointer-events: none;
}

.dotrule {
  height: 6px;
  margin-block: var(--space);
  background-image: radial-gradient(circle, var(--rule) 1.6px, transparent 2px);
  background-size: 12px 6px;
  border: 0;
}

.dm {
  width: 100%;
  height: auto;
  color: var(--ink);
}

.dm-off {
  opacity: 0.075;
}

.dm-red {
  stroke: var(--red);
}

.wordmark .dm-red {
  stroke: var(--red);
}

/* ---------- Widgets (mockups) ---------- */

.widget {
  display: grid;
  place-items: center;
  padding: clamp(1.25rem, 4vw, 2rem);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
}

.widget > .dm {
  max-width: 17rem;
}

/* ---------- Home ---------- */

.hero {
  position: relative;
  display: grid;
  gap: 3.5rem;
  align-items: center;
  padding-block: clamp(3rem, 9vw, 7rem) var(--space);
}

.hero-visual {
  position: relative;
  margin: 0;
}

.hero-visual .dotfield {
  position: absolute;
  inset: -3rem -2rem;
  z-index: -1;
}

.hero-visual .widget {
  aspect-ratio: 2 / 1;
  max-width: 30rem;
  margin-inline: auto;
}

.hero-visual .widget > .dm {
  max-width: 82%;
}

.tate {
  display: none;
}

@media (min-width: 56rem) {
  .hero {
    grid-template-columns: 1.1fr 1fr;
  }

  .tate {
    display: block;
    position: absolute;
    top: clamp(3rem, 9vw, 7rem);
    right: calc(var(--gutter) - 1.75rem);
    margin: 0;
    writing-mode: vertical-rl;
    color: var(--ink-2);
    font-size: 0.875rem;
    letter-spacing: 0.5em;
  }
}

.featured-card {
  display: grid;
  gap: 3rem;
  padding: clamp(1.75rem, 6vw, 4rem);
  border: 1px solid var(--rule);
  border-radius: calc(var(--radius) + 0.5rem);
  background: var(--paper-2);
}

.featured-art {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  align-content: center;
}

.featured-art .widget {
  aspect-ratio: 1;
}

.featured-art .widget:first-child {
  grid-column: 1 / -1;
  aspect-ratio: 2.2 / 1;
}

@media (min-width: 52rem) {
  .featured-card {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
}

.ticks {
  display: grid;
  gap: 0.55rem;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}

.ticks li {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
}

.ticks li::before {
  content: "";
  width: 6px;
  height: 6px;
  margin-top: 0.62em;
  border-radius: 50%;
  background: var(--ink);
  flex: none;
  align-self: flex-start;
}

.section {
  padding-top: var(--space);
}

.section-head {
  max-width: 36rem;
  margin-bottom: 3rem;
}

.principles-list {
  display: grid;
  gap: 2.5rem 3rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: p;
}

.principles-list li {
  counter-increment: p;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}

.principles-list li::before {
  content: "0" counter(p);
  display: block;
  margin-bottom: 1rem;
  color: var(--red-text);
  font: 500 0.8125rem var(--mono);
  letter-spacing: 0.12em;
}

.principles-list p {
  color: var(--ink-2);
}

@media (min-width: 48rem) {
  .principles-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- Product page ---------- */

.product-hero {
  padding-block: clamp(3rem, 9vw, 6rem) 0;
}

.product-hero h1 {
  max-width: 13ch;
}

.price-note {
  margin-top: 1.25rem;
  color: var(--ink-2);
  font-size: 0.9375rem;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 15.5rem), 1fr));
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.gallery li {
  display: grid;
  gap: 0.9rem;
  align-content: start;
}

.gallery .widget {
  aspect-ratio: 1.35 / 1;
}

.gallery .widget > .dm {
  max-width: 72%;
}

.gallery .widget > .dm.square {
  max-width: 46%;
}

.gallery .widget > .dm.mid {
  max-width: 54%;
}

.gallery h3 {
  margin: 0 0 0.25rem;
}

.gallery p {
  margin: 0;
  color: var(--ink-2);
  font-size: 0.9375rem;
}

.promises {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.promises li {
  position: relative;
  padding: clamp(1.5rem, 4vw, 2.25rem);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
  overflow: hidden;
}

.promises li::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 9rem;
  height: 7rem;
  background-image: radial-gradient(circle, var(--dot) 1.3px, transparent 1.8px);
  background-size: 12px 12px;
  -webkit-mask-image: linear-gradient(225deg, #000, transparent 70%);
  mask-image: linear-gradient(225deg, #000, transparent 70%);
}

.promises p {
  margin: 0;
  color: var(--ink-2);
}

@media (min-width: 48rem) {
  .promises {
    grid-template-columns: 1fr 1fr;
  }
}

.facts {
  display: grid;
  gap: 0;
  margin: 0;
  border-top: 1px solid var(--rule);
}

.facts div {
  display: grid;
  gap: 0.25rem 2rem;
  padding-block: 1.1rem;
  border-bottom: 1px solid var(--rule);
}

.facts dt {
  color: var(--ink-2);
  font: 500 0.75rem/1.9 var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.facts dd {
  margin: 0;
}

@media (min-width: 40rem) {
  .facts div {
    grid-template-columns: 12rem 1fr;
  }
}

/* ---------- Prose (legal, support) ---------- */

.page-head {
  padding-block: clamp(3rem, 8vw, 5.5rem) 2.5rem;
}

.page-head h1 {
  font-size: clamp(2.1rem, 5vw, 3.25rem);
}

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

.prose h2 {
  margin-top: 3.25rem;
  font-size: 1.5rem;
}

.prose h3 {
  margin-top: 2rem;
}

.prose ul,
.prose ol {
  padding-left: 1.25rem;
}

.prose li {
  margin-bottom: 0.45rem;
}

.prose li::marker {
  color: var(--ink-2);
}

.prose code {
  font: 0.9em var(--mono);
}

.prose hr {
  margin-block: 3rem;
  border: 0;
  border-top: 1px solid var(--rule);
}

.summary {
  margin: 0 0 2.5rem;
  padding: 1.5rem 1.75rem;
  border-left: 2px solid var(--red);
  border-radius: 0 1rem 1rem 0;
  background: var(--paper-2);
}

.summary h2 {
  margin-top: 0;
  font-size: 1.125rem;
  font-weight: 500;
}

.summary ul {
  margin: 0;
}

.toc {
  margin: 0 0 3rem;
  padding: 1.25rem 0;
  border-block: 1px solid var(--rule);
  font-size: 0.9375rem;
}

.toc ol {
  columns: 2 14rem;
  margin: 0;
  padding-left: 1.25rem;
}

.meta {
  color: var(--ink-2);
  font-size: 0.9375rem;
}

.table-scroll {
  overflow-x: auto;
  margin: 1.5rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

th,
td {
  padding: 0.7rem 0.9rem 0.7rem 0;
  border-bottom: 1px solid var(--rule);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--ink-2);
  font: 500 0.75rem/1.6 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* FAQ disclosure (no JavaScript) */
.faq {
  border-top: 1px solid var(--rule);
}

.faq details {
  border-bottom: 1px solid var(--rule);
}

.faq summary {
  position: relative;
  padding: 1.15rem 2.5rem 1.15rem 0;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "";
  position: absolute;
  right: 0.4rem;
  top: 50%;
  width: 7px;
  height: 7px;
  margin-top: -3.5px;
  border-radius: 50%;
  border: 1.5px solid var(--ink-2);
}

.faq details[open] summary::after {
  background: var(--red);
  border-color: var(--red);
}

.faq .answer {
  padding: 0 0 1.25rem;
}

.faq .answer > :last-child {
  margin-bottom: 0;
}

.oem {
  margin: 1.5rem 0;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--rule);
  border-radius: 1.25rem;
  background: var(--card);
}

.oem h3 {
  margin-top: 0;
}

.oem ol {
  margin-bottom: 0;
}

.contact-card {
  margin-top: 3rem;
  padding: clamp(1.5rem, 5vw, 2.5rem);
  border-radius: var(--radius);
  background: var(--paper-2);
}

.contact-card a.email {
  font-size: 1.25rem;
  font-weight: 500;
}

/* ---------- 404 ---------- */

.notfound {
  display: grid;
  justify-items: start;
  gap: 1.5rem;
  padding-block: clamp(4rem, 12vw, 8rem) 0;
}

.notfound .dm {
  width: min(16rem, 70vw);
}

/* ---------- Print ---------- */

@media print {
  .site-header nav,
  .site-footer nav,
  .skip,
  .dotfield,
  .toc {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  a {
    text-decoration: underline;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}