/* ─────────────────────────────────────────────────────────────────────────
   Sumi — Marketing site styles. Mirror of the in-app design system tokens.
   Source of truth: docs/handoff/reference/sumi/tokens.jsx
   ───────────────────────────────────────────────────────────────────────── */

:root {
  /* Paper */
  --paper:        #F4ECE0;
  --paper-warm:   #EBE0CC;
  --paper-deep:   #DFD1B6;
  --paper-edge:   #C9B48A;
  --paper-glow:   #FBF6ED;

  /* Ink */
  --ink:          #1A1410;
  --ink-soft:     #5A4838;
  --ink-faint:    #8A7560;
  --ink-ghost:    #B3A088;

  /* Accents — used sparingly */
  --red:          #A8342A;
  --red-deep:     #7E2820;
  --teal:         #2A5A6E;
  --teal-soft:    #4A7A8E;
  --gold:         #8A6B2A;

  /* Type families */
  --font-display: "Cormorant Garamond", "Source Serif Pro", Georgia, serif;
  --font-body:    "Source Serif 4", "Source Serif Pro", Georgia, serif;
  --font-ui:      "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-cjk:     "Shippori Mincho", "Noto Serif JP", "Hiragino Mincho ProN", serif;
  --font-hand:    "Caveat", "Kalam", cursive;

  /* Motion easing — settles like wet ink */
  --ease-paper:   cubic-bezier(0.22, 0.75, 0.28, 1);
  --ease-bleed:   cubic-bezier(0.16, 0.84, 0.24, 1);
}

/* ── Reset ──────────────────────────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; }

/* ── Base ───────────────────────────────────────────────────────────────── */

html {
  font-size: 17px;
  scroll-behavior: smooth;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.65;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Washi paper noise — subtle multiply overlay so every surface has grain. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240' viewBox='0 0 240 240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' seed='3'/><feColorMatrix values='0 0 0 0 0.10  0 0 0 0 0.08  0 0 0 0 0.06  0 0 0 0.22 0'/></filter><rect width='240' height='240' filter='url(%23n)'/></svg>");
  mix-blend-mode: multiply;
  opacity: 0.55;
  pointer-events: none;
  z-index: 1;
}

::selection {
  background: rgba(168, 52, 42, 0.22);
  color: var(--ink);
}

/* ── InkBleed bullseye accents ──────────────────────────────────────────
   The design-system primitive (3 concentric circles + turbulence /
   displacement filter) scattered as decorative stamps. Each blot inherits
   its color via CSS `color` (the SVG circles use fill="currentColor"). */

.ink-blots {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.ink-blot {
  position: absolute;
  display: block;
  color: var(--ink);
}

/* Two blots only: pink (SW) + winter indigo (NE). The indigo matches the
   app's SumiSeason.Winter accent so the marketing site and the in-app
   winter mode share the same blue chord. */
.ib-sw { bottom: 80px; left: 48px; width: 240px; height: 240px; color: var(--red); transform: rotate(-14deg); }
.ib-ne { top: 56px;    right: 64px; width: 220px; height: 220px; color: #4A5CB0; transform: rotate(8deg); }

@media (max-width: 820px) {
  .ib-sw { width: 180px; height: 180px; bottom: 56px; left: 20px; }
  .ib-ne { width: 150px; height: 150px; top: 28px;    right: 28px; }
}

/* ── Container & section rhythm ────────────────────────────────────────── */

.container {
  max-width: 1080px;
  margin-inline: auto;
  padding-inline: 32px;
  position: relative;
  z-index: 2;
}

section { padding-block: 112px; position: relative; z-index: 2; }

@media (max-width: 768px) {
  .container { padding-inline: 24px; }
  section { padding-block: 72px; }
}

/* ── Chop-stamp seal (top-right anchor) ────────────────────────────────── */

.chop-stamp {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 10;
  width: 52px;
  height: 52px;
  background: var(--red);
  color: var(--paper-glow);
  font-family: var(--font-cjk);
  font-size: 28px;
  font-weight: 500;
  display: grid;
  place-items: center;
  transform: rotate(-3deg);
  box-shadow:
    0 4px 0 rgba(120, 40, 30, 0.35),
    0 10px 24px rgba(168, 52, 42, 0.22);
  user-select: none;
  text-decoration: none;
  transition: transform 260ms var(--ease-paper), box-shadow 260ms var(--ease-paper);
  animation: stamp-press 600ms 1.2s var(--ease-paper) both;
}

.chop-stamp:hover {
  transform: rotate(-1deg) translateY(-2px);
  box-shadow:
    0 6px 0 rgba(120, 40, 30, 0.40),
    0 14px 32px rgba(168, 52, 42, 0.28);
}

@keyframes stamp-press {
  0%   { opacity: 0; transform: rotate(8deg) scale(1.6); }
  60%  { opacity: 1; }
  100% { opacity: 1; transform: rotate(-3deg) scale(1); }
}

/* ── Hero ──────────────────────────────────────────────────────────────── */

.hero {
  min-height: 92vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding-block: 96px 64px;
}

.hero .logo-frame {
  margin-bottom: 32px;
  filter: drop-shadow(0 18px 36px rgba(26, 20, 16, 0.10));
  animation: ink-bleed 1.8s var(--ease-bleed) both;
  user-select: none;
}

.hero .logo-mark {
  display: block;
  width: clamp(160px, 28vw, 280px);
  height: auto;
  /* iOS app icons ship as full-square PNGs with the squircle mask applied
     by the OS at runtime. Clip to ~22% radius here so the marketing site
     icon matches the launcher tile users actually see. */
  border-radius: 22%;
}

@keyframes ink-bleed {
  0%   { opacity: 0; transform: scale(0.42) translateY(40px); filter: blur(32px); }
  35%  { opacity: 0.6; }
  100% { opacity: 1; transform: scale(1) translateY(0); filter: blur(0); }
}

.hero .brand {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: clamp(56px, 8vw, 104px);
  line-height: 1;
  letter-spacing: -1.5px;
  margin-bottom: 16px;
  animation: rise 900ms 600ms var(--ease-paper) both;
}

.hero .tagline {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(20px, 2vw, 26px);
  color: var(--ink-soft);
  margin-bottom: 36px;
  animation: rise 900ms 800ms var(--ease-paper) both;
}

.hero .manifest {
  max-width: 36em;
  font-size: 19px;
  line-height: 1.7;
  color: var(--ink-soft);
  animation: rise 900ms 1000ms var(--ease-paper) both;
}

.hero .manifest em {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--ink);
}

@keyframes rise {
  0%   { opacity: 0; transform: translateY(18px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* ── Brush rule (hand-drawn divider) ───────────────────────────────────── */

.brush-rule {
  border: 0;
  height: 28px;
  margin: 0 auto;
  max-width: 880px;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1000 28' preserveAspectRatio='none'><path d='M 12 14 Q 80 8, 180 14 T 360 16 T 540 12 T 720 15 T 900 13 T 988 14' fill='none' stroke='%231A1410' stroke-width='1.2' stroke-linecap='round' opacity='0.45'/></svg>");
  background-repeat: no-repeat;
  background-size: 100% 100%;
  background-position: center;
}

/* ── Section header — ceremonial Japanese numerals + small caps ─────── */

.section-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 56px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--paper-edge);
}

.section-num {
  font-family: var(--font-cjk);
  font-size: 28px;
  color: var(--red);
  line-height: 1;
}

.section-label {
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* ── Quote section ─────────────────────────────────────────────────────── */

.quote {
  text-align: center;
  padding-block: 96px;
}

.quote blockquote {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(26px, 3.4vw, 42px);
  font-weight: 400;
  line-height: 1.35;
  max-width: 24em;
  margin-inline: auto;
  color: var(--ink);
  text-wrap: balance;
}

.quote blockquote::before { content: "“"; color: var(--ink-faint); margin-right: 2px; }
.quote blockquote::after  { content: "”"; color: var(--ink-faint); margin-left: 2px; }

.quote cite {
  display: block;
  margin-top: 28px;
  font-style: normal;
  font-family: var(--font-ui);
  font-size: 11px;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* ── Practice (feature cards) ─────────────────────────────────────────── */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1px;
  background: var(--paper-edge);
  border: 1px solid var(--paper-edge);
}

.card {
  background: var(--paper);
  padding: 44px 32px 40px;
  position: relative;
  transition: background 320ms var(--ease-paper);
}

.card:hover { background: var(--paper-glow); }

.card .kanji {
  font-family: var(--font-cjk);
  font-size: 56px;
  color: var(--ink);
  margin-bottom: 28px;
  line-height: 1;
  font-weight: 500;
  display: inline-block;
  transform-origin: 50% 80%;
  transition: transform 460ms var(--ease-bleed);
}

.card:hover .kanji { transform: scale(1.08); }

.card h3 {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 500;
  font-style: italic;
  margin-bottom: 12px;
  color: var(--ink);
}

.card p {
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink-soft);
}

/* ── Sudoku grid preview ──────────────────────────────────────────────── */

.grid-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}

.sudoku {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: var(--ink);
  width: min(380px, 90vw);
  aspect-ratio: 1;
  padding: 2px;
  box-shadow:
    0 1px 0 rgba(26, 20, 16, 0.06),
    0 14px 40px rgba(26, 20, 16, 0.10),
    0 4px 10px rgba(26, 20, 16, 0.06);
}

.sudoku .box {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--paper-edge);
}

.sudoku .cell {
  background: var(--paper-glow);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(16px, 4vw, 22px);
  color: var(--ink);
  aspect-ratio: 1;
}

.sudoku .cell.user { color: var(--teal); }
.sudoku .cell.empty { color: var(--ink-ghost); }

.grid-caption {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 17px;
  color: var(--ink-faint);
  text-align: center;
  max-width: 36em;
}

/* Aurora hover — a slow watercolour sweep on first hover, sumi-e style. */
.sudoku { position: relative; overflow: hidden; }
.sudoku::after {
  content: "";
  position: absolute;
  inset: 2px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(168, 52, 42, 0.18) 18%,
    rgba(138, 107, 42, 0.18) 36%,
    rgba(42, 90, 110, 0.18) 54%,
    rgba(90, 122, 58, 0.14) 72%,
    rgba(122, 90, 138, 0.14) 86%,
    transparent 100%
  );
  mix-blend-mode: multiply;
  transform: translateX(-110%);
  pointer-events: none;
  transition: transform 1400ms var(--ease-bleed);
}

.sudoku:hover::after { transform: translateX(110%); }

/* ── The seasons — falling petals per palette ─────────────────────────── */

.seasons-intro {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(20px, 2.2vw, 26px);
  color: var(--ink-soft);
  max-width: 38em;
  margin-bottom: 56px;
  line-height: 1.45;
}

.seasons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--paper-edge);
  border: 1px solid var(--paper-edge);
}

@media (max-width: 980px) { .seasons { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .seasons { grid-template-columns: 1fr; } }

.season-panel {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--paper-warm);
  overflow: hidden;
}

/* Each season tints its own paper — same gradient idea the in-app
   SeasonPalette uses, just dialled down for the marketing surface. */
.season-panel[data-season="spring"] .petal-field { background: linear-gradient(180deg, #FBF6ED 0%, #F8E8E8 100%); }
.season-panel[data-season="summer"] .petal-field { background: linear-gradient(180deg, #F4ECE0 0%, #E5EBD9 100%); }
.season-panel[data-season="autumn"] .petal-field { background: linear-gradient(180deg, #F4ECE0 0%, #E8D8C0 100%); }
/* Winter — indigo wash, mirrors the app's SumiSeason.Winter paper tints
   (paper #EEEEF8 → paperDeep #D8DAE8) so snow against cool blue reads
   like the in-app season. */
.season-panel[data-season="winter"] .petal-field { background: linear-gradient(180deg, #EEEEF8 0%, #C8D0E8 100%); }

.petal-field {
  position: relative;
  height: 280px;
  overflow: hidden;
  isolation: isolate;
}

@media (max-width: 560px) { .petal-field { height: 220px; } }

.petal {
  position: absolute;
  top: 0;
  pointer-events: none;
  animation-name: petal-drift;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
  will-change: transform, opacity;
}

.petal svg {
  display: block;
  width: 100%;
  height: 100%;
}

/* translateY uses pixel values, NOT percentages — transform percentages are
   resolved against the element's own dimensions (a 24px petal × 120% = 29px,
   nowhere near the container floor). 360px easily clears both the desktop
   field height (280px) and the mobile one (220px). */
@keyframes petal-drift {
  0%   { transform: translate3d(0, -40px, 0) rotate(0deg); opacity: 0; }
  10%  { opacity: var(--petal-o, 0.7); }
  50%  { transform: translate3d(var(--petal-sway, 24px), 160px, 0) rotate(var(--petal-spin, 180deg)); }
  90%  { opacity: var(--petal-o, 0.7); }
  100% { transform: translate3d(calc(var(--petal-sway, 24px) * -0.5), 360px, 0) rotate(calc(var(--petal-spin, 180deg) * 2)); opacity: 0; }
}

.season-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 24px 20px;
  border-top: 1px solid var(--paper-edge);
  background: var(--paper);
}

.season-kanji {
  font-family: var(--font-cjk);
  font-weight: 500;
  font-size: 52px;
  line-height: 1;
  color: var(--ink);
  user-select: none;
}

.season-info {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.season-name {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: 22px;
  color: var(--ink);
  line-height: 1;
}

.season-romaji {
  font-family: var(--font-ui);
  font-size: 10px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.season-dots {
  display: flex;
  gap: 5px;
  margin-top: 4px;
}

.season-dots span {
  width: 12px;
  height: 12px;
  background: var(--c);
  border: 1px solid rgba(26, 20, 16, 0.10);
}


/* ── Download CTAs ─────────────────────────────────────────────────────── */

.cta-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.cta {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 20px 32px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 3px;
  text-transform: uppercase;
  position: relative;
  transition:
    transform 260ms var(--ease-paper),
    box-shadow 260ms var(--ease-paper),
    background 260ms var(--ease-paper);
}

.cta:hover {
  transform: translate(-3px, -3px);
  background: #000;
  /* Solid offset shadow only appears on hover — like a stamp lifting from
     paper. No misaligned ghost-border at rest. */
  box-shadow: 5px 5px 0 var(--paper-edge);
}

/* The store button matching the visitor's device — a quiet resting offset
   shadow so the right choice reads as primary without shouting. */
.cta--target {
  box-shadow: 4px 4px 0 var(--paper-edge);
}
.cta--target:hover {
  box-shadow: 5px 5px 0 var(--paper-edge);
}

.cta .platform {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.5px;
  text-transform: none;
  margin-left: 4px;
}

.cta-note {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 17px;
  color: var(--ink-faint);
}

/* ── Footer ────────────────────────────────────────────────────────────── */

footer {
  border-top: 1px solid var(--paper-edge);
  padding-block: 56px 80px;
  font-family: var(--font-ui);
  font-size: 13px;
  color: var(--ink-soft);
  position: relative;
  z-index: 2;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 56px;
}

.footer-grid h4 {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 18px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 12px;
}

.footer-grid a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--paper-edge);
  padding-bottom: 1px;
  transition: border-color 200ms;
  display: inline-block;
}

.footer-grid a:hover { border-color: var(--ink); }

.footer-grid ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }

.footer-coda {
  text-align: center;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 22px;
  color: var(--ink-faint);
  padding-top: 32px;
  border-top: 1px solid var(--paper-edge);
}

@media (max-width: 720px) {
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* ── Article (privacy policy body) ─────────────────────────────────────── */

.article {
  max-width: 720px;
  margin: 0 auto;
  padding-block: 96px;
}

.article .article-meta {
  font-family: var(--font-ui);
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 16px;
}

.article h1 {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1.05;
  letter-spacing: -1px;
  color: var(--ink);
  margin-bottom: 32px;
}

.article .lede {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 22px;
  line-height: 1.5;
  color: var(--ink-soft);
  margin-bottom: 56px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--paper-edge);
}

.article h2 {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: 28px;
  color: var(--ink);
  margin-top: 56px;
  margin-bottom: 20px;
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.article h2 .num {
  font-family: var(--font-cjk);
  font-size: 22px;
  color: var(--red);
  font-style: normal;
}

.article p, .article li {
  font-size: 18px;
  line-height: 1.75;
  color: var(--ink);
  margin-bottom: 16px;
}

.article ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: 16px;
}

.article li {
  padding-left: 24px;
  position: relative;
  margin-bottom: 12px;
}

.article li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--ink-faint);
}

.article a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--paper-edge);
  transition: border-color 200ms;
}

.article a:hover { border-color: var(--ink); }

.article strong { font-weight: 600; color: var(--ink); }

.article hr {
  border: 0;
  height: 1px;
  background: var(--paper-edge);
  margin-block: 56px;
}

.article table {
  width: 100%;
  border-collapse: collapse;
  margin-block: 24px 32px;
  font-size: 16px;
}

.article th, .article td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--paper-edge);
}

.article th {
  font-family: var(--font-ui);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--ink-soft);
  background: var(--paper-warm);
}

.article td:first-child { color: var(--ink); }
.article td:nth-child(2) { color: var(--ink-soft); }

/* ── Brand bar (small back-link in privacy page) ─────────────────────── */

.page-bar {
  border-bottom: 1px solid var(--paper-edge);
  padding-block: 22px;
  position: relative;
  z-index: 2;
}

.page-bar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.page-bar .brand-link {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: 22px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.5px;
}

.page-bar .brand-link .mark {
  font-family: var(--font-cjk);
  font-style: normal;
  font-size: 20px;
  margin-right: 8px;
  color: var(--ink);
}

.page-bar .back-link {
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 200ms;
}

.page-bar .back-link:hover { color: var(--ink); }

/* ── Reduced motion ───────────────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}