@charset "UTF-8";

/* 通信費みなおしノート — shared stylesheet
   Plain CSS, no build step, no framework. Mobile first: most traffic is
   expected to arrive from X / SNS on a phone. */

:root {
  --ink: #1f2933;
  --ink-soft: #52606d;
  --ink-faint: #7b8794;
  --rule: #dde3e8;
  --rule-soft: #eef2f5;
  --paper: #ffffff;
  --paper-tint: #f6f8fa;
  --accent: #1f5f8b;
  --accent-dark: #16496b;
  --measure: 44rem;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN",
    "Hiragino Sans", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.85;
  overflow-wrap: break-word;
}

.wrap {
  width: 100%;
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 1.15rem;
}

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

.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
}

.site-id {
  padding: 1.1rem 0 0.85rem;
}

.site-name {
  display: inline-block;
  margin: 0;
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink);
  text-decoration: none;
}

.site-name:hover {
  color: var(--accent);
}

.site-tag {
  margin: 0.3rem 0 0;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--ink-faint);
}

.site-nav {
  border-top: 1px solid var(--rule-soft);
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1.1rem;
  margin: 0;
  padding: 0.15rem 0 0.4rem;
  list-style: none;
}

.site-nav a {
  display: inline-block;
  padding: 0.55rem 0;
  font-size: 0.88rem;
  color: var(--ink-soft);
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus {
  color: var(--accent);
  text-decoration: underline;
}

.site-nav a[aria-current="page"] {
  color: var(--accent);
  font-weight: 700;
}

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

main {
  padding: 2rem 0 3rem;
}

h1 {
  margin: 0 0 0.9rem;
  font-size: 1.6rem;
  line-height: 1.5;
  letter-spacing: 0.01em;
}

.lede {
  margin: 0 0 2rem;
  color: var(--ink-soft);
  font-size: 1rem;
}

h2 {
  margin: 2.6rem 0 0.85rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--rule-soft);
  font-size: 1.2rem;
  line-height: 1.55;
}

h3 {
  margin: 1.8rem 0 0.6rem;
  font-size: 1.02rem;
  line-height: 1.6;
}

p {
  margin: 0 0 1.1rem;
}

ul,
ol {
  margin: 0 0 1.2rem;
  padding-left: 1.35rem;
}

li {
  margin-bottom: 0.5rem;
}

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

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

.small {
  font-size: 0.86rem;
  color: var(--ink-soft);
}

/* ---------------------------------------------------------------- blocks */

.card {
  margin: 0 0 1.2rem;
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--paper-tint);
}

.card h3 {
  margin-top: 0;
}

.card > :last-child {
  margin-bottom: 0;
}

.note {
  margin: 1.6rem 0;
  padding: 0.95rem 1.1rem;
  border-left: 3px solid var(--accent);
  background: var(--paper-tint);
  font-size: 0.92rem;
  line-height: 1.8;
}

.note > :last-child {
  margin-bottom: 0;
}

.disclosure {
  margin: 2.4rem 0 0;
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--rule);
  border-radius: 6px;
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.disclosure > :last-child {
  margin-bottom: 0;
}

/* entry links — internal navigation, never an advertising call to action */

.entries {
  margin: 0 0 1.4rem;
  padding: 0;
  list-style: none;
}

.entries li {
  margin-bottom: 0.7rem;
}

.entry {
  display: block;
  padding: 0.95rem 1.1rem;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--paper);
  color: var(--ink);
  text-decoration: none;
}

.entry:hover,
.entry:focus {
  border-color: var(--accent);
  background: var(--paper-tint);
  color: var(--ink);
}

.entry b {
  display: block;
  font-size: 1rem;
  color: var(--accent);
}

.entry span {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* step list for the decision workflow */

.steps {
  margin: 0 0 1.4rem;
  padding-left: 1.3rem;
}

.steps > li {
  margin-bottom: 1rem;
}

.steps b {
  display: block;
}

/* definition-style rows for criteria */

.rows {
  margin: 0 0 1.4rem;
  border-top: 1px solid var(--rule-soft);
}

.rows > div {
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--rule-soft);
}

.rows dt {
  margin: 0 0 0.3rem;
  font-weight: 700;
}

.rows dd {
  margin: 0;
  font-size: 0.94rem;
  color: var(--ink-soft);
}

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

.site-footer {
  border-top: 1px solid var(--rule);
  background: var(--paper-tint);
  padding: 1.8rem 0 2.4rem;
  font-size: 0.86rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.site-footer ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1rem;
  margin: 0 0 0.9rem;
  padding: 0;
  list-style: none;
}

.site-footer li a {
  display: inline-block;
  padding: 0.35rem 0;
}

.operator {
  margin: 0 0 0.35rem;
  font-weight: 700;
  color: var(--ink);
}

.site-footer p {
  margin: 0 0 0.4rem;
}

/* ------------------------------------------------------------ wider view */

@media (min-width: 40rem) {
  body {
    font-size: 16.5px;
  }

  h1 {
    font-size: 1.85rem;
  }

  h2 {
    font-size: 1.28rem;
  }

  .site-id {
    padding: 1.35rem 0 1rem;
  }

  .site-name {
    font-size: 1.24rem;
  }

  main {
    padding: 2.6rem 0 3.6rem;
  }
}