/* ============================================================
   COTARU GUIDE — Design Tokens + Base Styles
   Concept: 編集メディア路線 / Vignelli Canon / 白が主役
   ============================================================ */

:root {
  /* Core palette */
  --white:   #ffffff;
  --paper:   #faf8f5;
  --ink:     #1a1a1a;
  --sub:     #666f78;
  --line:    rgba(0, 0, 0, .10);

  /* Seasonal accent (default = autumn amber; swap via JS or body class) */
  --season-spring: #e8a0b4;
  --season-summer: #3d8bbd;
  --season-autumn: #c48a3f;
  --season-winter: #7ba7c9;
  --accent: var(--season-autumn);
  --accent-soft: #f5ead8;

  /* NO green (#157a52) — rentalcycle only */

  /* Typography */
  --font-body-ja: system-ui, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  --font-body-en: "Inter", system-ui, sans-serif;
  --font-serif-ja: "Noto Serif JP", serif;
  --font-serif-en: "Playfair Display", "Noto Serif JP", serif;

  /* Font sizes */
  --fs-xs:   12px;
  --fs-sm:   13px;
  --fs-base: 17px;
  --fs-md:   18px;
  --fs-lg:   22px;
  --fs-xl:   clamp(32px, 5vw, 48px);
  --fs-hero: clamp(40px, 7.5vw, 76px);

  /* Line heights */
  --lh-body: 1.82;
  --lh-head: 1.16;

  /* Spacing */
  --gap-xs: 4px;
  --gap-sm: 8px;
  --gap:    16px;
  --gap-md: 24px;
  --gap-lg: 40px;
  --gap-xl: 64px;

  /* Shape */
  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 16px;

  /* Shadow */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, .05);
  --shadow:    0 14px 40px rgba(0, 0, 0, .07);

  /* Layout */
  --wrap: min(1000px, calc(100vw - 32px));
}

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

html, body {
  margin: 0;
  overflow-x: hidden;
}

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

/* ---- Base ---- */
body {
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-body-ja);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
}

a {
  color: inherit;
  text-decoration-color: var(--line);
}

h1, h2, h3, h4 {
  margin: 0;
  line-height: var(--lh-head);
  letter-spacing: -.01em;
  font-family: var(--font-serif-ja);
}

h1 { font-size: var(--fs-hero); }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-lg); }
h4 { font-size: var(--fs-base); font-weight: 700; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

/* ---- Layout shell ---- */
.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.wrap {
  width: var(--wrap);
  margin-inline: auto;
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 248, 245, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  width: var(--wrap);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
  padding: 18px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand__logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.brand__text {
  font-family: var(--font-serif-ja);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--ink);
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.site-header__nav a {
  color: var(--sub);
  font-size: var(--fs-sm);
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition: color .15s;
}

.site-header__nav a:hover,
.site-header__nav a.active { color: var(--ink); }

.lang-switcher {
  display: flex;
  gap: 4px;
}

.lang-btn {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--sub);
  font: 700 12px/1 var(--font-body-ja);
  padding: 5px 9px;
  cursor: pointer;
  transition: background .15s, color .15s;
}

.lang-btn.active,
.lang-btn:hover {
  background: var(--ink);
  color: var(--white);
  border-color: var(--ink);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--line);
  background: var(--white);
}

.site-footer__inner {
  width: var(--wrap);
  margin-inline: auto;
  padding: 32px 0 48px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--gap-md);
  align-items: start;
}

.site-footer__copy {
  color: var(--sub);
  font-size: var(--fs-sm);
}

.site-footer__links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.site-footer__links a {
  color: var(--sub);
  font-size: var(--fs-sm);
  font-weight: 700;
  text-decoration: none;
}

.site-footer__links a:hover { color: var(--ink); }

/* ============================================================
   GUIDE CARD  (.guide-card)
   ============================================================ */
.guide-card {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--ink);
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.guide-card:hover,
.guide-card:focus-visible {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
  outline: 0;
}

.guide-card__badge {
  display: inline-block;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent);
  font-size: var(--fs-xs);
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: 3px 10px;
  align-self: flex-start;
}

.guide-card__title {
  font-family: var(--font-serif-ja);
  font-size: 17px;
  line-height: 1.4;
  font-weight: 700;
}

.guide-card__desc {
  color: var(--sub);
  font-size: var(--fs-sm);
  line-height: 1.7;
  flex: 1;
}

.guide-card__cta {
  font-size: var(--fs-sm);
  font-weight: 800;
  color: var(--accent);
  margin-top: auto;
}

/* ============================================================
   HOME PAGE SECTIONS
   ============================================================ */
.page-main {
  flex: 1;
  width: var(--wrap);
  margin-inline: auto;
  padding: 36px 0 80px;
}

/* Hero */
.hero {
  padding: 56px 0 40px;
  display: grid;
  gap: 24px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: var(--fs-xs);
  font-weight: 900;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.hero h1 { max-width: 880px; }

.hero__lead {
  max-width: 700px;
  color: var(--sub);
  font-size: var(--fs-md);
}

/* Search */
.search-bar {
  max-width: 680px;
}

.search-bar__label {
  display: grid;
  gap: 6px;
  color: var(--sub);
  font-size: var(--fs-xs);
  font-weight: 800;
  letter-spacing: .08em;
}

.search-bar__input {
  width: 100%;
  min-height: 52px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--white);
  color: var(--ink);
  padding: 0 22px;
  font: inherit;
  font-size: var(--fs-base);
  box-shadow: var(--shadow-sm);
  transition: border-color .15s;
}

.search-bar__input:focus {
  outline: 0;
  border-color: var(--accent);
}

/* Seasonal Feature */
.feature-section {
  margin-top: 40px;
}

.feature-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 28px;
  align-items: center;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-sm);
}

.feature-card__body h2 {
  font-size: clamp(22px, 3vw, 32px);
  margin: 8px 0 16px;
}

.feature-card__body p { color: var(--sub); }

.feature-card__img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: var(--radius);
}

.feature-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--paper);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--sub);
  font-size: var(--fs-sm);
}

/* Pain-point nav cards */
.concern-section { margin-top: 48px; }

.concern-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--gap);
  margin-top: 20px;
}

.concern-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 20px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  font-size: var(--fs-sm);
  text-align: center;
  transition: transform .16s, box-shadow .16s;
}

.concern-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.concern-card__icon { font-size: 28px; }

/* Category section */
.category-section { margin-top: 56px; }

.category-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
  margin-top: 20px;
}

.category-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  transition: border-color .15s;
}

.category-card:hover { border-color: var(--accent); }

.category-card__icon { font-size: 24px; flex-shrink: 0; }

/* Articles grid */
.articles-section { margin-top: 56px; }

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
  margin-top: 20px;
}

/* EN guides banner */
.en-banner {
  margin-top: 56px;
  padding: 36px 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--ink);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap-md);
}

.en-banner h2 {
  font-family: var(--font-serif-en);
  font-size: clamp(22px, 3vw, 30px);
  color: var(--white);
}

.en-banner p { color: rgba(255,255,255,.7); margin-top: 8px; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: var(--white);
  color: var(--ink);
  font-size: var(--fs-sm);
  font-weight: 800;
  padding: 12px 28px;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  transition: opacity .15s;
}

.btn-primary:hover { opacity: .85; }

/* Section heading */
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--gap);
}

.section-head h2 { font-size: clamp(22px, 3.5vw, 32px); }

.section-head__more {
  color: var(--accent);
  font-size: var(--fs-sm);
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

/* ============================================================
   ARTICLE PAGE
   ============================================================ */
.article-body {
  max-width: 760px;
}

.article-body h2 {
  font-size: clamp(22px, 3vw, 28px);
  margin: 2.4em 0 .8em;
}

.article-body h3 {
  font-size: var(--fs-lg);
  margin: 2em 0 .6em;
}

.article-body p {
  font-size: var(--fs-md);
  line-height: 1.9;
  margin: 0 0 1.4em;
}

.article-body ul,
.article-body ol {
  padding-left: 1.6em;
  margin: 0 0 1.4em;
}

.article-body li {
  font-size: var(--fs-md);
  line-height: 1.9;
  margin-bottom: .4em;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.6em 0;
  font-size: 15px;
}

.article-body th,
.article-body td {
  padding: 10px 14px;
  border: 1px solid var(--line);
  text-align: left;
}

.article-body th {
  background: var(--paper);
  font-weight: 700;
}

/* Breadcrumb */
.breadcrumb {
  color: var(--sub);
  font-size: var(--fs-sm);
  margin-bottom: 20px;
}

.breadcrumb a { text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

/* ============================================================
   RESPONSIVE  920px / 620px
   ============================================================ */
@media (max-width: 920px) {
  .feature-card {
    grid-template-columns: 1fr;
  }

  .feature-card__img,
  .feature-placeholder { aspect-ratio: 16/7; }

  .concern-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .article-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .en-banner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 620px) {
  .site-header__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 0;
  }

  .site-header__nav { flex-wrap: wrap; gap: 10px; }

  .article-grid,
  .category-grid { grid-template-columns: 1fr; }

  .concern-grid { grid-template-columns: repeat(2, 1fr); }

  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: var(--gap);
  }

  .en-banner { padding: 24px 20px; }
}