:root {
  --paper: #f4efe4;
  --ink: #1d1a16;
  --muted: #5a534b;
  --line: #ddd3c4;
  --link: #7d2e18;
  --persimmon: #c24d2c;
  --pine: #243f36;
  --seal: #9e2b2b;
  --measure: 40rem;
  --page: 1080px;
  color-scheme: light;
}

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

[hidden] { display: none !important; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(6.5rem + env(safe-area-inset-top, 0px));
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

:target,
[id],
h2,
h3 { scroll-margin-top: calc(6.5rem + env(safe-area-inset-top, 0px)); }

body {
  margin: 0;
  padding-left: env(safe-area-inset-left, 0px);
  padding-right: env(safe-area-inset-right, 0px);
  background:
    radial-gradient(900px 420px at 0% -10%, rgba(194, 77, 44, 0.07), transparent 50%),
    radial-gradient(700px 380px at 100% 0%, rgba(36, 63, 54, 0.05), transparent 46%),
    var(--paper);
  color: var(--ink);
  font-family: "Zen Kaku Gothic New", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "YuGothic", sans-serif;
  font-size: 1.0625rem;
  line-height: 1.95;
  line-break: strict;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--link); }

button, input, textarea {
  font: inherit;
  color: inherit;
  touch-action: manipulation;
}

a, label, summary { touch-action: manipulation; }

button, a, label, input, textarea {
  -webkit-tap-highlight-color: rgba(194, 77, 44, 0.16);
}

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

::selection { background: #f0c2b0; color: var(--ink); }

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: #fff;
  color: var(--ink);
  padding: 0.4rem 0.7rem;
  z-index: 30;
}

.skip:focus { top: 0.6rem; }

.readbar {
  position: fixed;
  top: env(safe-area-inset-top, 0px);
  left: 0;
  right: 0;
  height: 2px;
  z-index: 25;
  pointer-events: none;
}

.readbar span {
  display: block;
  height: 100%;
  background: var(--persimmon);
  transform: scaleX(0);
  transform-origin: left center;
}

.frame {
  width: min(var(--page), calc(100% - 2.5rem));
  margin-inline: auto;
}

.narrow {
  width: min(var(--measure), calc(100% - 2.5rem));
  margin-inline: auto;
}

.mast {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 10;
  padding-top: env(safe-area-inset-top, 0px);
  background: rgba(244, 239, 228, 0.97);
  border-bottom: 1px solid var(--ink);
}

.mast-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem 1.5rem;
  padding: 0.85rem 0;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}

.seal {
  width: 2.55rem;
  height: 2.55rem;
  display: grid;
  place-items: center;
  border: 2px solid var(--seal);
  color: var(--seal);
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Hiragino Mincho Pro", "YuMincho", "Yu Mincho", serif;
  font-size: 1.35rem;
  line-height: 1;
  transform: rotate(-8deg);
}

.brand-ja {
  display: block;
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Hiragino Mincho Pro", "YuMincho", "Yu Mincho", serif;
  font-size: 1.35rem;
  letter-spacing: 0.14em;
  line-height: 1.15;
}

.brand-en {
  display: block;
  margin-top: 0.1rem;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.15rem;
}

.nav a,
.foot a,
.row,
.gate,
.pager a {
  text-decoration: none;
}

.nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0.2rem 0.05rem;
  color: var(--ink);
}

.nav a:active,
.nav a[aria-current="page"] { color: var(--link); }

.nav a[aria-current="page"] { box-shadow: inset 0 -1px 0 var(--link); }

.hero { position: relative; padding: 2.4rem 0 1rem; overflow: hidden; }

.hero::after {
  content: "冬";
  position: absolute;
  right: -0.08em;
  top: 0.1em;
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Hiragino Mincho Pro", "YuMincho", "Yu Mincho", serif;
  font-size: clamp(8rem, 24vw, 16rem);
  line-height: 0.8;
  color: rgba(29, 26, 22, 0.05);
  pointer-events: none;
}

.hero-copy,
.hero h1,
.eyebrow { position: relative; z-index: 1; }

h1, h2, h3, .mincho {
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Hiragino Mincho Pro", "YuMincho", "Yu Mincho", serif;
  font-weight: 500;
  line-height: 1.35;
}

h1 {
  margin: 0;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  letter-spacing: 0.04em;
  max-width: 12em;
}

h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin: 0 0 0.8rem; }

.eyebrow {
  margin: 0 0 0.85rem;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--link);
}

.hero-copy { max-width: 38rem; }

.lead {
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Hiragino Mincho Pro", "YuMincho", "Yu Mincho", serif;
  font-size: 1.28rem;
  line-height: 1.85;
}

.prose p,
.hero-copy p { margin: 0 0 1.05em; }

.article h3 {
  margin: 1.7rem 0 0.45rem;
  font-size: 1.2rem;
}

.term-list {
  margin: 0.2rem 0 1.2rem;
  padding: 0;
  list-style: none;
}

.term-list li {
  padding: 0.7rem 0;
  border-top: 1px solid var(--line);
}

.term-list li:last-child { border-bottom: 1px solid var(--line); }

.term-list strong { display: block; margin-bottom: 0.15rem; }

.quiet { color: var(--muted); font-size: 0.92rem; }

.block { padding: 1.6rem 0; }

.checks { margin-top: 0.4rem; }

.check {
  display: grid;
  grid-template-columns: 1.35rem 1fr;
  gap: 0.85rem;
  align-items: center;
  min-height: 2.75rem;
  padding: 0.7rem 0;
  border-top: 1px solid var(--line);
}

.check:last-of-type { border-bottom: 1px solid var(--line); }

.check input {
  -webkit-appearance: none;
  appearance: none;
  width: 1.35rem;
  height: 1.35rem;
  margin: 0;
  border: 1px solid var(--ink);
  border-radius: 0;
  background-color: transparent;
  display: block;
}

.check input:checked {
  border-color: var(--persimmon);
  background-color: var(--persimmon);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 10'%3E%3Cpath d='M1 5.2 4.2 8.4 11 1.4' fill='none' stroke='white' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 0.75rem 0.62rem;
}

.done {
  margin: 1rem 0 0;
  padding-top: 0.2rem;
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Hiragino Mincho Pro", "YuMincho", "Yu Mincho", serif;
  font-size: 1.2rem;
}

.rows { border-bottom: 1px solid var(--line); }

.row {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 0.15rem 0.85rem;
  align-items: baseline;
  padding: 1.15rem 0;
  border-top: 1px solid var(--line);
  color: inherit;
}

.row .num {
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Hiragino Mincho Pro", "YuMincho", "Yu Mincho", serif;
  color: var(--persimmon);
  font-size: 1.15rem;
}

.row strong {
  display: block;
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Hiragino Mincho Pro", "YuMincho", "Yu Mincho", serif;
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: 0.03em;
}

.row small {
  display: block;
  color: var(--muted);
  font-size: 0.92rem;
}

.row .go {
  grid-column: 2;
  color: var(--link);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
}

.row:active strong { color: var(--link); }

.gates {
  display: grid;
  gap: 0.9rem;
  padding-bottom: 1rem;
}

.gate {
  display: block;
  min-height: 100%;
  padding: 1.25rem 1.2rem 1.35rem;
  border: 1px solid var(--line);
  background: rgba(255, 252, 247, 0.45);
  color: inherit;
}

.gate:active { border-color: var(--ink); }

.gate h2 { margin: 0 0 0.35rem; }

.gate p:last-child { margin: 0; }

.saved ul { margin: 0; padding-left: 1.1rem; }

.crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.crumb a { color: inherit; }

.essay { padding: 2rem 0 1rem; }

.meta { color: var(--muted); font-size: 0.9rem; }

.note {
  margin: 2rem 0;
  padding: 1rem 1.15rem 1.15rem;
  background: rgba(36, 63, 54, 0.06);
  border-left: 3px solid var(--pine);
}

.note h2 { margin: 0 0 0.4rem; font-size: 1.2rem; }

.note ul { margin: 0; padding-left: 1.15rem; }

.endmark {
  text-align: center;
  letter-spacing: 0.45em;
  color: var(--muted);
  margin: 2.2rem 0;
}

.fruit {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 0;
  cursor: pointer;
  display: block;
  margin: 0.5rem 0 0.2rem;
}

.fruit svg { display: block; }

.cutline {
  fill: none;
  stroke: #f4efe4;
  stroke-width: 2.5;
  stroke-linecap: round;
}

.cutline.h { stroke-dasharray: 82; stroke-dashoffset: 82; }
.cutline.v { stroke-dasharray: 82; stroke-dashoffset: 82; }

.fruit[aria-pressed="true"] .cutline { stroke-dashoffset: 0; }

.tsuyu {
  margin: 1.2rem 0 1.6rem;
  padding: 0.9rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.tsuyu input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  display: block;
  width: min(100%, 18rem);
  height: 2.75rem;
  margin: 0.2rem 0 0;
  background: transparent;
  accent-color: var(--persimmon);
}

.tsuyu input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  background: var(--ink);
}

.tsuyu input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 1.7rem;
  height: 1.7rem;
  margin-top: -0.78rem;
  border: 0;
  border-radius: 50%;
  background: var(--persimmon);
}

.btn {
  -webkit-appearance: none;
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  text-decoration: none;
  padding: 0.55rem 1rem;
  cursor: pointer;
  line-height: 1.4;
}

.btn:active,
.choice a:active {
  background: var(--ink);
  color: var(--paper);
}

.choice { display: flex; flex-wrap: wrap; gap: 0.55rem; margin: 0.4rem 0 1.2rem; }

.pager {
  margin-top: 0.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
}

.pager a {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 0.6rem;
  color: inherit;
  align-items: baseline;
}

.pager strong {
  display: block;
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Hiragino Mincho Pro", "YuMincho", "Yu Mincho", serif;
  font-size: 1.45rem;
  font-weight: 500;
}

.pager small { color: var(--muted); }

.tools { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; }

.sekki-tools { display: grid; gap: 1.6rem; }

.season-block { margin-bottom: 1rem; }

.season-block h2 { font-size: 1.25rem; margin-bottom: 0.45rem; }

.season-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.4rem; }

.season-grid button {
  -webkit-appearance: none;
  appearance: none;
  min-height: 2.75rem;
  text-align: left;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 0;
  padding: 0.55rem 0.7rem;
  cursor: pointer;
  line-height: 1.4;
}

.season-grid button[aria-pressed="true"] {
  border-color: var(--ink);
  background: #fffdf8;
}

.now {
  display: inline-block;
  margin-left: 0.35rem;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--link);
}

.js [data-panel] { display: none; }
.js [data-panel].is-on { display: block; }
.js [data-quiz] [data-step] { display: none; }
.js [data-quiz] [data-step].is-on { display: block; }
.js [data-result] { display: none; }
.js [data-result].is-on { display: block; }
.js [data-quiz-root].is-done [data-quiz] { display: none; }

.panel {
  padding-top: 0.2rem;
}

.panel + .panel { margin-top: 2.2rem; padding-top: 1.4rem; border-top: 1px solid var(--line); }
.js .panel + .panel { margin-top: 0; padding-top: 0.2rem; border-top: 0; }

.panel h3 {
  font-size: clamp(2rem, 5vw, 3.1rem);
  margin: 0 0 0.3rem;
}

.action {
  padding-top: 0.3rem;
  border-top: 1px solid var(--line);
}

.quiz-stage { min-height: 22rem; }

fieldset { border: 0; margin: 0; padding: 0; }

legend {
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Hiragino Mincho Pro", "YuMincho", "Yu Mincho", serif;
  font-size: clamp(1.45rem, 3vw, 1.9rem);
  line-height: 1.45;
  margin-bottom: 0.8rem;
  padding: 0;
}

.option {
  display: grid;
  grid-template-columns: 1.35rem 1fr;
  gap: 0.75rem;
  align-items: center;
  min-height: 2.75rem;
  padding: 0.65rem 0;
  border-top: 1px solid var(--line);
}

.option input {
  width: 1.15rem;
  height: 1.15rem;
  margin: 0;
}

.option:last-of-type { border-bottom: 1px solid var(--line); }

.form label { display: block; margin-bottom: 1rem; }

.form input,
.form textarea {
  -webkit-appearance: none;
  appearance: none;
  display: block;
  width: 100%;
  min-width: 0;
  margin-top: 0.3rem;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--ink);
  border-radius: 0;
  padding: 0.7rem 0;
  font-size: 1rem;
  line-height: 1.5;
}

.form textarea {
  border: 1px solid var(--line);
  padding: 0.7rem;
  min-height: 9rem;
  resize: vertical;
}

.foot {
  margin-top: 3.5rem;
  border-top: 1px solid var(--line);
  padding: 1.8rem 0 calc(2.6rem + env(safe-area-inset-bottom, 0px));
}

.foot-inner { display: grid; gap: 0.8rem; }

.foot nav { display: flex; flex-wrap: wrap; gap: 0.35rem 1.1rem; }

.foot a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--ink);
}

.foot a:active { color: var(--link); }

.copy, .foot-note { color: var(--muted); font-size: 0.88rem; margin: 0; }

.prose a { text-underline-offset: 0.18em; }

@media (hover: hover) and (pointer: fine) {
  .nav a:hover,
  .foot a:hover { color: var(--link); }
  .row:hover strong { color: var(--link); }
  .gate:hover { border-color: var(--ink); }
  .btn:hover,
  .choice a:hover {
    background: var(--ink);
    color: var(--paper);
  }
}

@media (max-width: 719px) {
  html { scroll-padding-top: calc(8rem + env(safe-area-inset-top, 0px)); }

  :target,
  [id],
  h2,
  h3 { scroll-margin-top: calc(8rem + env(safe-area-inset-top, 0px)); }

  .frame,
  .narrow { width: min(var(--page), calc(100% - 2rem)); }

  .hero { padding: 1.35rem 0 0.35rem; }

  .hero::after {
    font-size: 6.4rem;
    top: -0.08em;
    right: -0.18em;
  }

  h1 {
    font-size: 2.3rem;
    letter-spacing: 0.02em;
  }

  .lead { font-size: 1.12rem; line-height: 1.8; }

  .brand-ja { font-size: 1.2rem; letter-spacing: 0.08em; }

  .row strong { font-size: 1.22rem; }

  .essay { padding-top: 1.35rem; }

  .quiz-stage { min-height: 0; }

  .choice .btn { flex: 1 1 calc(50% - 0.4rem); }

  .form .btn,
  .tools .btn,
  [data-quiz] .btn,
  [data-restart] { width: 100%; }
}

@media (min-width: 720px) {
  .row {
    grid-template-columns: 4.2rem 1fr auto;
    align-items: baseline;
  }

  .row .go { grid-column: auto; }

  .season-grid { grid-template-columns: repeat(3, 1fr); }

  .gates { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 900px) {
  .sekki-tools {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: start;
  }

  .sekki-index { order: -1; }

  .panel-wrap { position: sticky; top: 5.6rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cutline { transition: none; }
}

@media (min-width: 721px) {
  .cutline { transition: stroke-dashoffset 0.45s ease; }
}

@media print {
  .mast, .foot, .readbar, .skip, .fruit, .tools, .choice, .tsuyu input { display: none !important; }
  body { background: #fff; }
}