/*
 * 婚姻届LABO 共通デザイン基盤（v16）
 * ------------------------------------------------------------
 * 色・文字・余白・本文幅・共通見出し・ボタンをここで一元管理します。
 * 下層CSSでは、ページ固有のレイアウトや例外だけを指定してください。
 */

:root {
  /* Brand colors */
  --color-primary: #1540a2;
  --color-primary-dark: #062c82;
  --color-primary-deep: #053c78;
  --color-secondary: #6da7de;
  --color-primary-pale: #eef5fb;
  --color-accent: #8b7b37;
  --color-accent-dark: #6f6128;

  /* Neutral colors */
  --color-text: #333;
  --color-text-strong: #2d3338;
  --color-muted: #6f747b;
  --color-border: #dfe5ea;
  --color-line: var(--color-border);
  --color-border-warm: #ddd8ca;
  --color-surface: #fff;
  --color-surface-muted: #f7f7f7;
  --color-surface-blue: #f7fbfe;
  --color-white: #fff;

  /* Typography */
  --font-sans: "Noto Sans JP", "Noto Sans CJK JP", "Yu Gothic", YuGothic, "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  --font-serif: "Noto Serif JP", "Noto Serif CJK JP", "Yu Mincho", YuMincho, "Hiragino Mincho ProN", "Hiragino Mincho Pro", "MS PMincho", serif;
  --font-size-body: 17px;
  --font-size-body-sp: 15px;
  --font-size-heading-xl: 32px;
  --font-size-heading-lg: 24px;
  --font-size-heading-md: 20px;
  --line-height-body: 2;

  /* Layout */
  --content-width: 1070px;
  --wide-content-width: 1120px;
  --site-nav-height-pc: 80px;
  --site-nav-height-sp: 64px;
  --radius-sm: 2px;
  --shadow-card: 0 20px 55px rgba(18, 61, 101, 0.12);

  /* Existing names kept as aliases for legacy page CSS. */
  --blue: var(--color-primary);
  --blue-dark: var(--color-primary-dark);
  --blue-light: var(--color-secondary);
  --blue-pale: var(--color-primary-pale);
  --gold: #594a0f;
  --gold-light: #b7a46b;
  --ink: var(--color-text);
  --muted: var(--color-muted);
  --line: var(--color-border);
  --white: var(--color-white);
  --serif: var(--font-serif);
  --sans: var(--font-sans);
  --content: var(--content-width);
  --nav-height: var(--site-nav-height-pc);

  --labo-blue: #064b8d;
  --labo-blue-deep: var(--color-primary-deep);
  --labo-nav: var(--color-secondary);
  --labo-gold: #68590d;
  --labo-gold-soft: var(--color-accent);
  --labo-ink: var(--color-text);
  --labo-line: #d9d9d9;
  --labo-content: var(--content-width);

  --hub-blue: var(--color-primary);
  --hub-blue-deep: #073b78;
  --hub-sky: var(--color-secondary);
  --hub-pale: #eef6fb;
  --hub-pale-2: var(--color-surface-blue);
  --hub-gold: #78691f;
  --hub-ink: var(--color-text-strong);
  --hub-muted: #69747d;
  --hub-line: #dfe8ef;
  --hub-shadow: var(--shadow-card);
  --hub-radius: var(--radius-sm);
  --hub-shell: var(--wide-content-width);

  --v8-nav-height-pc: var(--site-nav-height-pc);
  --v8-nav-height-sp: var(--site-nav-height-sp);
  --v8-navy: var(--color-accent);
  --v8-navy-dark: var(--color-accent-dark);
  --v8-shop-navy: var(--color-accent);
  --v8-shop-navy-dark: var(--color-accent-dark);
  --v8-blue-soft: #f7f4e8;
  --v8-border: #dedbd0;
  --v8-text: var(--color-text);
}

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

html {
  min-width: 320px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--site-nav-height-pc) + 18px);
  overflow-x: clip;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--color-text);
  background: var(--color-surface);
  font-family: var(--font-sans);
  font-size: var(--font-size-body);
  font-weight: 400;
  line-height: var(--line-height-body);
  letter-spacing: 0.005em;
  overflow-x: clip;
  word-break: normal;
  line-break: strict;
}

body.nav-open {
  overflow: hidden;
}

body > *,
main,
section,
article,
aside,
nav,
div,
figure,
blockquote {
  min-width: 0;
}

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

picture {
  display: block;
  max-width: 100%;
}

iframe {
  display: block;
  width: min(100%, 760px);
  height: auto;
  margin-inline: auto;
  border: 0;
  aspect-ratio: 16 / 9;
}

a {
  color: var(--color-primary);
  text-underline-offset: 0.18em;
}

a:hover,
a:focus-visible {
  color: #4675e2;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible {
  outline: 3px solid #f2c94c;
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 9999;
  top: 8px;
  left: 8px;
  padding: 10px 16px;
  color: var(--color-white);
  background: var(--color-primary);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: none;
}

.font-mincho {
  font-family: var(--font-serif);
}

/* Shared width and section heading components. */
.section-shell {
  width: min(calc(100% - 48px), var(--wide-content-width));
  margin-inline: auto;
}

.section-kicker {
  margin: 0 0 12px;
  color: var(--color-accent-dark);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.22em;
  line-height: 1.5;
}

.section-lead {
  max-width: 820px;
  margin: 26px auto 0;
  color: var(--color-text);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  text-align: left;
}

.section-heading-row {
  display: flex;
  margin-bottom: 38px;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
}

.section-heading-center {
  max-width: 850px;
  margin: 0 auto 48px;
  text-align: center;
}

.section-heading-row h2,
.section-heading-center h2,
.hub-intro h2,
.hub-feature h2,
.product-overview h2,
.product-overview h3,
.hub-final-cta h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 500;
  letter-spacing: 0.045em;
}

.section-heading-row h2,
.section-heading-center h2,
.hub-intro h2,
.product-overview h2,
.hub-final-cta h2 {
  color: var(--color-primary-dark);
  font-size: var(--font-size-heading-xl);
  line-height: 1.5;
}

.section-heading-center > p:last-child {
  margin: 20px auto 0;
  color: #56636d;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  color: var(--color-primary);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.text-link:hover,
.text-link:focus-visible {
  text-decoration: underline;
}

.button {
  display: inline-flex;
  min-width: 220px;
  min-height: 52px;
  padding: 12px 24px;
  align-items: center;
  justify-content: center;
  border: 1px solid currentColor;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
}

.button--primary {
  color: var(--color-white);
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.button--primary:hover,
.button--primary:focus-visible {
  color: var(--color-primary);
  background: var(--color-white);
}

.button--outline {
  color: var(--color-primary);
  background: var(--color-white);
  border-color: var(--color-primary);
}

.button--outline:hover,
.button--outline:focus-visible {
  color: var(--color-white);
  background: var(--color-primary);
}

.button--ghost {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(6px);
}

.button--ghost:hover,
.button--ghost:focus-visible {
  color: var(--color-primary-dark);
  background: var(--color-white);
  border-color: var(--color-white);
}

.button-group,
.center-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* Small utilities for future page work. */
.u-text-left { text-align: left !important; }
.u-text-center { text-align: center !important; }
.u-font-sans { font-family: var(--font-sans) !important; }
.u-font-serif { font-family: var(--font-serif) !important; }
.u-stack > * { margin-block: 0; }
.u-stack > * + * { margin-top: 1.5em; }

@media (max-width: 959px) {
  :root {
    --nav-height: var(--site-nav-height-sp);
  }
}

@media (max-width: 900px) {
  body {
    font-size: var(--font-size-body-sp);
    line-height: 1.9;
    overflow-wrap: normal;
  }
}

@media (max-width: 769px) {
  html {
    scroll-padding-top: calc(var(--site-nav-height-sp) + 14px);
  }

  .section-shell {
    width: min(calc(100% - 30px), var(--wide-content-width));
  }

  .section-kicker {
    margin-bottom: 8px;
    font-size: 10px;
    letter-spacing: 0.18em;
  }

  .section-heading-row h2,
  .section-heading-center h2,
  .hub-intro h2,
  .product-overview h2,
  .hub-final-cta h2 {
    font-size: 23px;
    line-height: 1.55;
  }

  .section-heading-center {
    margin-bottom: 34px;
  }

  .section-heading-row {
    margin-bottom: 28px;
  }

  .section-lead {
    margin-top: 18px;
    font-size: var(--font-size-body-sp);
    line-height: 1.9;
  }

  .button {
    width: 100%;
    min-width: 0;
  }

  .button-group {
    width: 100%;
    flex-direction: column;
  }
}

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

/* 無限レールは v59 から product-memory-rail.css に分離しました。 */