/* 節気帖 -- 素箋 (shirafu) visual system.
   Light washi-paper palette, single seasonal accent, serif type, generous
   whitespace, no rounded corners, no icon fonts, no external assets. */

:root {
  --bg: #F7F4EC;
  --ink: #3A362E;
  --ink-soft: #8A8274;
  --line: #DDD6C8;
  --accent: #8A8274;
  --accent-rgb: 138,130,116;
  --serif: "Noto Serif JP", "Noto Serif SC", serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

/* Washi (和紙) paper grain: a faint SVG feTurbulence noise layer applied to
   every page, kept under 0.04 opacity so it reads as paper texture rather
   than visible static. Fixed + negative z-index so it never intercepts
   clicks and never needs z-index bookkeeping on the rest of the page. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.04;
  background-repeat: repeat;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* Top season band: a thin full-width strip in the current season's color,
   present on every page as a constant, quiet marker of "what season it
   is right now" even before any other content loads. */
.season-band {
  height: 3px;
  width: 100%;
  background: var(--accent);
}

.academy-return-bar {
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,0.38);
}

.academy-return-bar .wrap {
  min-height: 38px;
  display: flex;
  align-items: center;
}

.academy-return-bar a {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 0.55rem;
  border: 1px solid rgba(var(--accent-rgb),0.36);
  color: var(--accent);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  transition: background 0.16s ease, color 0.16s ease, transform 0.16s ease;
}

.academy-return-bar a:hover,
.academy-return-bar a:focus-visible {
  background: var(--accent);
  color: var(--bg);
  transform: translateX(-2px);
}

.academy-return-bar a:active { transform: translateX(-4px); }
.academy-label-zh,.academy-label-en { display: none; }
html[lang="zh"] .academy-label-ja,html[lang="zh"] .academy-label-en { display: none; }
html[lang="zh"] .academy-label-zh { display: inline; }
html[lang="en"] .academy-label-ja,html[lang="en"] .academy-label-zh { display: none; }
html[lang="en"] .academy-label-en { display: inline; }

/* A quiet bridge back to the parent academy. It floats above the page so
   every section remains escapable, while keeping the same paper-and-ink
   language as the calendar itself. */
.academy-back-button {
  position: fixed;
  left: 18px;
  bottom: 18px;
  z-index: 99999;
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 7px 16px 7px 7px;
  border: 1px solid rgba(var(--accent-rgb), 0.48);
  border-left-width: 3px;
  background: rgba(247,244,236,0.94);
  color: var(--ink);
  box-shadow: 0 6px 18px rgba(58,54,46,0.13);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  line-height: 1.35;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.academy-back-arrow {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  background: rgba(var(--accent-rgb),0.12);
  color: var(--accent);
  font-family: Georgia, serif;
  font-size: 1rem;
  transition: transform 0.18s ease, background 0.18s ease;
}

.academy-back-button:hover,
.academy-back-button:focus-visible {
  color: var(--ink);
  border-color: var(--accent);
  background: var(--bg);
  transform: translateY(-2px);
  box-shadow: 0 9px 24px rgba(58,54,46,0.18);
}

.academy-back-button:hover .academy-back-arrow,
.academy-back-button:focus-visible .academy-back-arrow {
  background: var(--accent);
  color: var(--bg);
  transform: translateX(-2px);
}

.academy-back-button:active {
  transform: translateY(1px);
  box-shadow: 0 3px 9px rgba(58,54,46,0.12);
}

@media (max-width: 640px) {
  .academy-back-button {
    left: 12px;
    bottom: calc(12px + env(safe-area-inset-bottom));
    min-height: 44px;
    max-width: calc(100vw - 24px);
    padding-right: 13px;
    font-size: 0.7rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .academy-back-button, .academy-back-arrow { transition: none; }
}

a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

a:hover {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

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

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.75rem;
}

/* ---------- header / nav ---------- */

.site-header {
  border-bottom: 1px solid var(--line);
  padding: 1.75rem 0 1.25rem;
}

.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
}

.site-title {
  font-size: 1.15rem;
  letter-spacing: 0.14em;
  margin: 0;
  font-weight: 500;
}

.site-title a {
  border-bottom: none;
}

.site-subtitle {
  color: var(--ink-soft);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  margin-left: 0.75rem;
}

.site-tagline-row {
  padding-top: 0.6rem;
}

.site-tagline {
  color: var(--ink-soft);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  margin: 0;
}

nav.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.85rem;
}

nav.site-nav a {
  border-bottom: none;
  padding: 0.22rem 0.38rem;
  border: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease, background 0.16s ease, transform 0.16s ease;
}

nav.site-nav a:hover,
nav.site-nav a:focus-visible {
  border-color: var(--line);
  background: rgba(255,255,255,0.48);
  transform: translateY(-1px);
}

nav.site-nav a:active { transform: translateY(1px); }

nav.site-nav .academy-home-link {
  color: var(--accent);
  border-color: rgba(var(--accent-rgb), 0.28);
  margin-right: 0.2rem;
  white-space: nowrap;
}

nav.site-nav a[aria-current="page"] {
  border-color: var(--accent);
  color: var(--accent);
}

.lang-switch {
  display: flex;
  gap: 0.6rem;
  font-size: 0.75rem;
  color: var(--ink-soft);
}

.lang-switch button {
  font-family: var(--serif);
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  color: var(--ink-soft);
  cursor: pointer;
  border-bottom: 1px solid transparent;
  font-size: 0.75rem;
}

.lang-switch button:hover {
  color: var(--ink);
}

.lang-switch button[aria-current="true"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------- main / footer ---------- */

main {
  padding: 3rem 0 4rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.75rem 0 3rem;
  color: var(--ink-soft);
  font-size: 0.78rem;
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
}

/* ---------- today page: the ceremonial sheet ---------- */

.today-sheet {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 3rem;
  align-items: center;
  justify-content: center;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 2.5rem;
  overflow: hidden;
}

/* Faint seasonal-color wash behind the hero -- large-radius, very low
   opacity radial gradient using the season's own RGB triplet so it never
   needs a per-season CSS rule of its own. */
.today-sheet::before {
  content: "";
  position: absolute;
  inset: -20%;
  background: radial-gradient(circle at 75% 20%, rgba(var(--accent-rgb), 0.07), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.kou-hero {
  position: relative;
  z-index: 1;
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: clamp(2.6rem, 9vw, 5.2rem);
  letter-spacing: 0.14em;
  line-height: 1.15;
  color: var(--ink);
  border-left: 1px solid var(--accent);
  padding-left: 1.25rem;
  min-height: 8rem;
  font-weight: 500;
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 0.6rem;
}

.kou-hero-furigana {
  font-size: 0.6rem;
  letter-spacing: 0.24em;
  color: var(--ink-soft);
  font-weight: 400;
}

/* Latin titles must not inherit the upright CJK writing mode. In English,
   the micro-season becomes a horizontal display heading, with metadata and
   the year wheel sharing the row below it. Japanese and Chinese retain the
   original vertical ceremonial composition. */
html[lang="en"] .today-sheet {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 2.25rem 3rem;
  align-items: center;
  justify-content: stretch;
}

html[lang="en"] .kou-hero {
  grid-column: 1 / -1;
  grid-row: 1;
  width: 100%;
  min-height: 0;
  display: block;
  writing-mode: horizontal-tb;
  text-orientation: mixed;
  padding: 1.25rem 0 0.95rem;
  border-left: 0;
  border-top: 1px solid var(--accent);
  font-family: Georgia, "Times New Roman", var(--serif);
  font-size: clamp(2.45rem, 6.2vw, 4.8rem);
  line-height: 1.08;
  letter-spacing: 0.015em;
  overflow-wrap: normal;
  word-break: normal;
}

html[lang="en"] .kou-hero-furigana,
html[lang="en"] .kou-reading { display: none; }
html[lang="en"] .today-meta { grid-column: 1; grid-row: 2; min-width: 0; }
html[lang="en"] .kou-wheel { grid-column: 2; grid-row: 2; }

.today-meta {
  position: relative;
  z-index: 1;
  writing-mode: horizontal-tb;
  min-width: 220px;
  flex: 1 1 260px;
}

.kou-wheel {
  position: relative;
  z-index: 1;
  width: 300px;
  height: 300px;
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
}

.kou-wheel-svg a {
  border-bottom: none;
}

.kou-wheel-svg text.kou-wheel-start-label {
  font-family: var(--serif);
  font-size: 9px;
  fill: var(--ink-soft);
  letter-spacing: 0.05em;
}

.kou-wheel-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  width: 62%;
  pointer-events: none;
}

.kou-wheel-order {
  margin: 0;
  font-size: clamp(1.1rem, 4vw, 1.6rem);
  letter-spacing: 0.08em;
  color: var(--accent);
  font-weight: 500;
  line-height: 1.2;
}

.kou-wheel-label {
  margin: 0.35rem 0 0;
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  line-height: 1.4;
}

.today-meta .eyebrow {
  color: var(--ink-soft);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  margin-bottom: 0.3rem;
}

.today-meta .sekki-name {
  font-size: 1.6rem;
  letter-spacing: 0.08em;
  margin: 0 0 1.4rem;
}

.today-meta .sekki-name .sekki-sub {
  display: block;
  color: var(--ink-soft);
  font-size: 0.85rem;
  margin-top: 0.3rem;
  letter-spacing: 0.04em;
}

.kou-order-badge {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 0.15rem 0.7rem;
  margin-bottom: 0.9rem;
}

.kou-reading {
  color: var(--ink-soft);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  margin: -0.6rem 0 1.2rem;
}

.today-dates {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 0.4rem;
}

.today-dates strong {
  color: var(--ink);
  font-weight: 500;
}

.progress-line {
  display: flex;
  gap: 0.4rem;
  margin: 1.1rem 0 0.3rem;
}

.progress-seg {
  flex: 1 1 0;
  height: 3px;
  background: var(--line);
  border-top: none;
}

.progress-seg.is-done {
  background: var(--ink-soft);
}

.progress-seg.is-current {
  background: var(--accent);
}

.progress-seg.is-upcoming {
  background: transparent;
  height: 0;
  border-top: 1px dashed var(--line);
}

.progress-label {
  font-size: 0.7rem;
  color: var(--ink-soft);
  letter-spacing: 0.06em;
}

/* ---------- "はじめての方へ" intro strip ---------- */

.intro-strip {
  margin-bottom: 2.5rem;
}

.intro-strip h2 {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  margin: 0 0 1rem;
  font-weight: 500;
}

.intro-cols {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.intro-col {
  flex: 1 1 220px;
  display: block;
  border: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 1.1rem 1.25rem;
}

.intro-col:hover {
  border-color: var(--accent);
}

.intro-col h3 {
  margin: 0 0 0.5rem;
  font-size: 0.92rem;
  letter-spacing: 0.06em;
  color: var(--ink);
  font-weight: 500;
}

.intro-col p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--ink-soft);
}

/* ---------- season story card ---------- */

.story-card {
  border: 1px solid var(--line);
  padding: 2rem 2.25rem;
}

.story-card h2 {
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin: 0 0 1rem;
  font-weight: 500;
}

.story-card p.desc {
  margin: 0 0 1.75rem;
  font-size: 1rem;
}

.story-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
}

.story-grid .story-block {
  flex: 1 1 220px;
}

.story-grid h3 {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  margin: 0 0 0.6rem;
  font-weight: 500;
}

.food-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.92rem;
}

.food-list li {
  padding: 0.15rem 0;
}

.food-list li::before {
  content: "・";
  color: var(--accent);
  margin-right: 0.3rem;
}

.flower-name {
  font-size: 1.05rem;
}

.today-sekki-link {
  display: inline-block;
  margin-top: 2rem;
  font-size: 0.85rem;
}

/* ---------- koyomi / sekki listing pages ---------- */

.page-lead {
  color: var(--ink-soft);
  margin: -0.5rem 0 2.5rem;
  max-width: 46ch;
}

h1.page-title {
  font-size: 1.5rem;
  letter-spacing: 0.1em;
  margin: 0 0 0.6rem;
  font-weight: 500;
}

.season-group {
  position: relative;
  margin-bottom: 3rem;
  padding-top: 0.3rem;
}

/* Oversized, near-transparent season kanji sitting behind each group's
   heading -- a quiet watermark that makes "which season am I reading"
   legible at a glance, before any text is read. */
.season-giant {
  position: absolute;
  top: -0.7rem;
  left: -0.15rem;
  font-family: var(--serif);
  font-size: clamp(3.2rem, 9vw, 6rem);
  line-height: 1;
  font-weight: 500;
  z-index: 0;
  pointer-events: none;
  user-select: none;
}

.season-group h2 {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  font-size: 1.15rem;
  letter-spacing: 0.12em;
  color: var(--ink);
  border-bottom: 1px solid var(--accent);
  padding-bottom: 0.5rem;
  margin: 0 0 1.5rem;
  font-weight: 500;
}

.season-group h2 .season-en {
  font-size: 0.68rem;
  color: var(--ink-soft);
  letter-spacing: 0.08em;
}

.entry-card {
  border-bottom: 1px solid var(--line);
  border-left: 3px solid transparent;
  padding: 1.6rem 0 1.6rem 0;
  transition: padding-left 0.15s ease;
}

.entry-card:first-child {
  padding-top: 0;
}

.entry-card.is-today {
  padding-left: 1rem;
}

.entry-global-order {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  font-weight: 500;
  margin-right: 0.15rem;
}

.entry-now-badge {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  border: 1px solid currentColor;
  padding: 0.05rem 0.4rem;
}

.entry-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.75rem 1rem;
  margin-bottom: 0.5rem;
}

.entry-order {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 0.05rem 0.5rem;
}

.entry-name {
  font-size: 1.25rem;
  letter-spacing: 0.06em;
}

.entry-reading {
  font-size: 0.78rem;
  color: var(--ink-soft);
}

.entry-dates {
  font-size: 0.75rem;
  color: var(--ink-soft);
  margin-bottom: 0.7rem;
}

.entry-desc {
  margin: 0 0 0.8rem;
}

.entry-extra {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.entry-extra strong {
  color: var(--ink);
  font-weight: 500;
  margin-right: 0.35rem;
}

.sekki-entry {
  border-bottom: 1px solid var(--line);
  padding: 2rem 0;
}

.sekki-entry:first-child {
  padding-top: 0;
}

.sekki-entry .entry-name {
  font-size: 1.4rem;
}

.sekki-color-chip {
  display: inline-block;
  width: 0.62rem;
  height: 0.62rem;
  margin-right: 0.15rem;
  vertical-align: middle;
}

.sekki-entry .entry-desc {
  margin-top: 0.9rem;
}

/* ---------- affiliate: "この時期の楽しみ" ---------- */

.affiliate-card {
  margin-top: 2rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--line);
}

.affiliate-badge {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 0.15rem 0.7rem;
  margin: 0 0 1.1rem;
}

.affiliate-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem 2.5rem;
}

.affiliate-item {
  flex: 1 1 220px;
  min-width: 200px;
}

.affiliate-item-name {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.affiliate-item-hint {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.affiliate-item-link {
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
}

.affiliate-item-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Inside the dense koyomi-listing entry cards, the affiliate block sits
   flush with the rest of the card's extra-info spacing rather than the
   wider today-page gap above. */
.entry-card .affiliate-card {
  margin-top: 1.1rem;
  padding-top: 1.1rem;
}

/* ---------- about page ---------- */

.about-section {
  margin-bottom: 2.5rem;
}

.about-section h2 {
  font-size: 1rem;
  letter-spacing: 0.1em;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.5rem;
  margin: 0 0 1rem;
  font-weight: 500;
}

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

.notfound {
  text-align: center;
  padding: 5rem 0;
}

.notfound .kou-hero {
  margin: 0 auto 2rem;
  display: inline-block;
  border-left: none;
  border-right: 1px solid var(--accent);
  padding-right: 1.25rem;
  padding-left: 0;
}

@media (max-width: 640px) {
  .today-sheet {
    justify-content: flex-start;
  }
  .story-card {
    padding: 1.5rem 1.4rem;
  }
  .kou-hero {
    order: 1;
    min-height: 5rem;
    font-size: clamp(2.1rem, 14vw, 3.2rem);
  }
  .kou-wheel {
    order: 2;
    width: 220px;
    height: 220px;
    margin: 0.5rem auto 0;
  }
  .today-meta {
    order: 3;
  }
  .intro-cols {
    flex-direction: column;
  }
  .intro-col {
    flex-basis: auto;
  }
  .season-giant {
    font-size: clamp(2.6rem, 16vw, 3.6rem);
  }
  html[lang="en"] .today-sheet {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.6rem;
  }
  html[lang="en"] .kou-hero {
    grid-column: 1;
    grid-row: 1;
    font-size: clamp(2.15rem, 11vw, 3.25rem);
    padding-top: 1rem;
  }
  html[lang="en"] .kou-wheel { grid-column: 1; grid-row: 2; }
  html[lang="en"] .today-meta { grid-column: 1; grid-row: 3; }
}