/* ==========================================================================
   積雪情報NOW - 共通スタイル（jouhoya.net と統一）
   ========================================================================== */
:root {
  --color-bg: #F4F6F1;
  --color-bg-blue: #E9EEE8;
  --color-panel: #FAFBF8;
  --color-text: #15202A;
  --color-text-sub: #52606B;
  --color-border: #C9D1CA;
  --color-accent: #2B4C69;
  --color-accent-dark: #2B4C69;
  --color-signal: #C4442B;
  --color-black: #15202A;
  --color-none: #8A97A3;
  --color-light: #6C9DC0;
  --color-some: #2B4C69;
  --color-much: #B87A12;
  --color-heavy: #C4442B;
  --grid: rgba(43,76,105,.07);
  --max-width: 960px;
}

:root { color-scheme: light; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Zen Kaku Gothic New", "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible { outline: 3px solid var(--color-signal); outline-offset: 2px; }
img { max-width: 100%; display: block; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4 { margin: 0 0 0.6em; line-height: 1.4; font-weight: 900; }
p { margin: 0 0 1em; }
table { border-collapse: collapse; width: 100%; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ---- Header ---- */
.site-header {
  border-bottom: 2px solid var(--color-text);
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 100;
}
.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-header__logo {
  font-size: 1.3rem;
  font-weight: 900;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.site-header__logo::before { content: ""; width: 12px; height: 12px; background: var(--color-signal); }
.site-header__nav { display: flex; gap: 20px; }
.site-header__nav a { font-size: 0.9rem; padding: 4px 0; border-bottom: 2px solid transparent; }
.site-header__nav a:hover { border-bottom-color: var(--color-signal); }
.site-header__menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}
.site-header__menu-btn span { display: block; width: 100%; height: 2px; background: var(--color-text); }

/* ---- Breadcrumb ---- */
.breadcrumb-wrap { background: var(--color-bg); border-bottom: 1px solid var(--color-border); }
.breadcrumb { max-width: var(--max-width); margin: 0 auto; padding: 8px 24px; font-size: 0.8rem; color: var(--color-text-sub); }
.breadcrumb ol { margin: 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 4px; }
.breadcrumb li { display: flex; align-items: center; gap: 4px; }
.breadcrumb li:not(:last-child)::after { content: '›'; margin-left: 4px; }
.breadcrumb a { color: var(--color-accent); text-decoration: underline; }

/* ---- Hero ---- */
.hero {
  padding: 56px 0 clamp(170px, 24vw, 260px);
  text-align: center;
  background:
    linear-gradient(180deg, rgba(244,246,241,.9) 0%, rgba(244,246,241,.6) 38%, rgba(244,246,241,0) 62%),
    url("/assets/img/hero.jpg") center bottom / cover no-repeat;
  border-bottom: 2px solid var(--color-text);
}
.hero h1 { font-size: clamp(1.7rem, 5vw, 2.6rem); line-height: 1.35; max-width: 18em; margin-left: auto; margin-right: auto; text-wrap: balance; }
.hero p.lead { color: var(--color-text-sub); max-width: 34em; margin: 0 auto 20px; }
.hero__alert {
  display: block;
  max-width: 40em;
  margin: 0 auto;
  text-align: left;
  background: var(--color-panel);
  border: 1.5px solid var(--color-text);
  border-left: 8px solid var(--color-light);
  padding: 12px 16px;
  font-weight: 700;
  font-size: 0.92rem;
}

/* ---- Section ---- */
.section { padding: 48px 0; border-top: 1px solid var(--color-border); }
.section--blue { background: var(--color-bg-blue); border-top: 2px solid var(--color-text); }
.section__title { font-size: 1.4rem; margin-bottom: 8px; }
.section__lead { color: var(--color-text-sub); margin-bottom: 24px; }

/* ---- Snow table (ranking / prefecture detail) ---- */
.snow-table-wrap { overflow-x: auto; }
.snow-table { font-size: 0.9rem; background: var(--color-panel); border-top: 2px solid var(--color-text); border-bottom: 1px solid var(--color-border); }
.snow-table th, .snow-table td {
  border-bottom: 1px solid var(--color-border);
  padding: 10px 12px;
  text-align: left;
  white-space: nowrap;
}
.snow-table thead th { color: var(--color-text-sub); font-weight: 700; }
.snow-table td a { text-decoration: underline; text-decoration-color: var(--color-signal); text-underline-offset: 3px; }
.snow-table__depth { font-weight: 900; font-variant-numeric: tabular-nums; }
.snow-table tbody tr:last-child td { border-bottom: none; }

/* ---- Tag (status label) ---- */
.tag {
  display: inline-block;
  padding: 2px 10px;
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  background: var(--color-none);
}
.tag.level-none { background: var(--color-none); }
.tag.level-light { background: var(--color-light); color: #10171D; }
.tag.level-some { background: var(--color-some); color: var(--color-bg); }
.tag.level-much { background: var(--color-much); color: #10171D; }
.tag.level-heavy { background: var(--color-heavy); color: #10171D; }
.tag.level-unknown { background: var(--color-none); }

/* ---- Card grid (prefecture list) ---- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(168px, 1fr));
  gap: 8px;
}
.pref-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-left: 6px solid var(--color-none);
  padding: 12px 14px;
  font-weight: 900;
}
.pref-card:hover { background: var(--color-bg); outline: 1.5px solid var(--color-text); outline-offset: -1px; }
.pref-card__depth { font-size: 0.85rem; color: var(--color-text-sub); font-weight: 700; font-variant-numeric: tabular-nums; }
.pref-card.level-light { border-left-color: var(--color-light); }
.pref-card.level-some { border-left-color: var(--color-some); }
.pref-card.level-much { border-left-color: var(--color-much); }
.pref-card.level-heavy { border-left-color: var(--color-heavy); }

/* ---- Prefecture hero (detail page) ---- */
.pref-hero { padding: 48px 0 32px; border-bottom: 6px solid var(--color-none); }
.pref-hero.level-light { border-bottom-color: var(--color-light); }
.pref-hero.level-some { border-bottom-color: var(--color-some); }
.pref-hero.level-much { border-bottom-color: var(--color-much); }
.pref-hero.level-heavy { border-bottom-color: var(--color-heavy); }
.pref-hero h1 { font-size: clamp(1.5rem, 4.4vw, 2.1rem); margin-bottom: 14px; }
.pref-hero__lead { color: var(--color-text-sub); max-width: 40em; margin: 0; }
.pref-hero__lead strong { color: var(--color-text); }

/* ---- Notice / error ---- */
.notice {
  background: var(--color-panel);
  border: 1.5px solid var(--color-text);
  border-left: 8px solid var(--color-light);
  padding: 14px 18px;
  color: var(--color-text);
}

/* ---- Static page ---- */
.static-page > * { max-width: 44em; }
.static-page h2 { margin-top: 1.6em; font-size: 1.15rem; padding-left: 12px; border-left: 4px solid var(--color-signal); }
.static-page a { color: var(--color-accent); text-decoration: underline; }

/* ---- Footer ---- */
.site-footer { background: var(--color-black); color: #D6DEE6; margin-top: 48px; border-top: 2px solid var(--color-text); }
.site-footer__inner { max-width: var(--max-width); margin: 0 auto; padding: 40px 24px; }
.site-footer__logo { font-weight: 900; font-size: 1.1rem; color: #fff; margin-bottom: 4px; }
.site-footer__catch { font-size: 0.85rem; color: #9AA8B4; margin-bottom: 20px; }
.site-footer__nav { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 20px; font-size: 0.85rem; }
.site-footer__nav a:hover { color: #fff; text-decoration: underline; }
.site-footer__credit { font-size: 0.75rem; color: #8FA0AE; margin-bottom: 12px; max-width: 720px; }
.site-footer__credit a { color: #B8C6D2; text-decoration: underline; }
.site-footer__copyright { font-size: 0.75rem; color: #8FA0AE; }

/* ---- Form (contact) ---- */
.form-row { margin-bottom: 18px; }
.form-row label { display: block; font-weight: 700; margin-bottom: 6px; font-size: 0.9rem; }
.form-row input[type="text"],
.form-row input[type="email"],
.form-row textarea {
  width: 100%;
  padding: 12px;
  border: 1.5px solid var(--color-text);
  background: var(--color-panel);
  color: var(--color-text);
  font-size: 0.95rem;
  font-family: inherit;
  border-radius: 0;
}
.btn-primary {
  display: inline-block;
  padding: 12px 28px;
  background: var(--color-text);
  color: var(--color-bg);
  border: none;
  font-size: 1rem;
  font-weight: 900;
  font-family: inherit;
  cursor: pointer;
  min-height: 48px;
}
.btn-primary:hover { background: var(--color-accent); }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .site-header__nav {
    position: fixed;
    top: 62px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 2px solid var(--color-text);
    flex-direction: column;
    padding: 16px 24px;
    gap: 16px;
    display: none;
  }
  .site-header__nav.is-open { display: flex; }
  .site-header__menu-btn { display: flex; }
  .hero { padding: 40px 0 150px; }
}

/* ---- Column (article) ---- */
.hero--plain { background: none; padding: 56px 0 32px; text-align: left; border-bottom: none; }
.hero--plain h1 { margin-left: 0; }
.hero--plain p.lead { margin-left: 0; }
.column-list { border-top: 2px solid var(--color-text); margin-bottom: 40px; }
.column-list li { border-bottom: 1px solid var(--color-border); }
.column-list a { display: block; padding: 14px 8px; }
.column-list a:hover { background: var(--color-panel); }
.column-list__title { display: block; font-weight: 900; font-size: 1.05rem; }
.column-list a:hover .column-list__title { text-decoration: underline; text-decoration-color: var(--color-signal); text-decoration-thickness: 3px; text-underline-offset: 4px; }
.column-list__desc { display: block; font-size: 0.88rem; color: var(--color-text-sub); margin-top: 2px; }
.article > .container > * { max-width: 44em; }
.article__head { margin-bottom: 28px; }
.article__meta { font-size: 0.82rem; color: var(--color-text-sub); margin-bottom: 8px; }
.article__head h1 { font-size: clamp(1.5rem, 4.6vw, 2.2rem); margin-bottom: 14px; }
.article__lead { color: var(--color-text-sub); }
.article__body h2 { font-size: 1.25rem; margin: 2em 0 0.6em; padding-left: 12px; border-left: 4px solid var(--color-signal); }
.article__body h3 { font-size: 1.05rem; margin: 1.4em 0 0.4em; }
.article__body ul, .article__body ol { margin: 0 0 1em; padding-left: 1.4em; }
.article__body ul { list-style: disc; }
.article__body ol { list-style: decimal; }
.article__body li { margin-bottom: 0.4em; }
.article__body a, .article__note a, .article__more > p a { color: var(--color-accent); text-decoration: underline; }
.article__body table { margin: 0 0 1.2em; }
.article__note { margin-top: 40px; padding: 14px 18px; background: var(--color-panel); border: 1.5px solid var(--color-text); border-left: 8px solid var(--color-light); font-size: 0.88rem; }
.article__note p { margin: 0; }
.article__more { margin-top: 48px; }
.article__more h2 { font-size: 1.1rem; }

.article__image { margin: 0 0 28px; border: 1px solid var(--color-border); background: var(--color-panel); }
.article__image img { width: 100%; height: auto; display: block; }
.hero--image { background: linear-gradient(90deg, rgba(244,246,241,.92) 0%, rgba(244,246,241,.7) 55%, rgba(244,246,241,.15) 100%), url("/assets/img/hero.jpg") center 70% / cover no-repeat; border-bottom: 2px solid var(--color-text); padding: 56px 0 56px; }

.page-image { margin: 0 0 24px; border: 1px solid var(--color-border); background: var(--color-panel); }
.page-image img { width: 100%; height: clamp(140px, 22vw, 260px); object-fit: cover; object-position: center 65%; display: block; }
.static-page > .page-image { max-width: none; }