/* tappy LP — tappy アプリのデザイントークンに準拠
   主色 #1170EE / 文字 #0F1720 / 背景 linear-gradient(172deg,#EDF4FC,#F6FAFE,#FDFEFF)
   和文書体 Zen Kaku Gothic New */

:root {
  --blue-600: #1170ee;
  --blue-700: #0b58c4;
  --blue-100: #dceafe;
  --blue-050: #eef5fe;
  --ink-900: #0f1720;
  --ink-700: #38424f;
  --ink-500: #6c7683;
  --ink-300: #98a2af;
  --line: #e4edf6;
  --surface: #ffffff;
  --radius: 18px;
  --radius-sm: 12px;
  --gutter: 20px;
  --maxw: 760px;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: "Zen Kaku Gothic New", -apple-system, BlinkMacSystemFont,
    "Hiragino Sans", "Noto Sans JP", sans-serif;
  color: var(--ink-900);
  background: linear-gradient(172deg, #edf4fc 0%, #f6fafe 52%, #fdfeff 100%);
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.85;
  font-size: 16px;
  letter-spacing: 0.01em;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---------- header ---------- */
.site-header {
  padding: 22px 0;
  border-bottom: 1px solid rgba(17, 112, 238, 0.1);
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink-900);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.02em;
}

.brand-mark {
  width: 30px;
  height: 30px;
  flex: none;
}

.nav {
  display: flex;
  gap: 18px;
  font-size: 14px;
}

.nav a {
  color: var(--ink-500);
  text-decoration: none;
}

.nav a:hover {
  color: var(--blue-600);
}

/* ---------- hero ---------- */
.hero {
  padding: 72px 0 56px;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--blue-700);
  background: var(--blue-050);
  border: 1px solid var(--blue-100);
  border-radius: 999px;
  padding: 6px 14px;
  margin: 0 0 22px;
}

.hero h1 {
  font-size: clamp(28px, 6vw, 42px);
  line-height: 1.4;
  margin: 0 0 20px;
  font-weight: 700;
  letter-spacing: 0.005em;
}

.hero h1 .accent {
  color: var(--blue-600);
}

.hero p.lede {
  font-size: 17px;
  color: var(--ink-700);
  margin: 0 auto;
  max-width: 34em;
}

/* ---------- steps ---------- */
.section {
  padding: 40px 0;
}

.section h2 {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 24px;
  letter-spacing: 0.01em;
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.steps li {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  box-shadow: 0 1px 2px rgba(15, 23, 32, 0.03);
}

.steps .num {
  flex: none;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--blue-600);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  display: grid;
  place-items: center;
  margin-top: 2px;
}

.steps h3 {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
}

.steps p {
  margin: 0;
  font-size: 15px;
  color: var(--ink-700);
}

.note {
  font-size: 13px;
  color: var(--ink-500);
  margin-top: 18px;
  line-height: 1.8;
}

/* ---------- cards ---------- */
.cards {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

@media (min-width: 620px) {
  .cards {
    grid-template-columns: 1fr 1fr;
  }
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: 0 1px 2px rgba(15, 23, 32, 0.03);
}

.card h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
}

.card p {
  margin: 0;
  font-size: 15px;
  color: var(--ink-700);
}

/* ---------- legal / doc pages ---------- */
.doc {
  padding: 44px 0 24px;
}

.doc h1 {
  font-size: clamp(24px, 5vw, 30px);
  font-weight: 700;
  margin: 0 0 8px;
  letter-spacing: 0.01em;
}

.doc .updated {
  font-size: 13px;
  color: var(--ink-500);
  margin: 0 0 32px;
}

.doc section {
  margin: 0 0 28px;
}

.doc h2 {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--ink-900);
}

.doc p {
  margin: 0 0 10px;
  font-size: 15px;
  color: var(--ink-700);
  white-space: pre-wrap;
}

.doc ul {
  margin: 0 0 10px;
  padding-left: 1.25em;
  font-size: 15px;
  color: var(--ink-700);
}

.doc ol {
  margin: 0 0 10px;
  padding-left: 1.3em;
  font-size: 15px;
  color: var(--ink-700);
}

.doc li {
  margin-bottom: 4px;
}

.doc a {
  color: var(--blue-600);
}

.back {
  display: inline-block;
  font-size: 14px;
  color: var(--blue-600);
  text-decoration: none;
  margin-bottom: 20px;
}

.back:hover {
  text-decoration: underline;
}

/* ---------- contact box ---------- */
.contact-box {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: 0 1px 2px rgba(15, 23, 32, 0.03);
}

.contact-box dl {
  margin: 0;
  display: grid;
  gap: 12px;
}

.contact-box dt {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-500);
  margin-bottom: 2px;
}

.contact-box dd {
  margin: 0;
  font-size: 15px;
  color: var(--ink-900);
}

.contact-box a {
  color: var(--blue-600);
}

/* ---------- footer ---------- */
.site-footer {
  margin-top: 48px;
  padding: 28px 0 44px;
  border-top: 1px solid rgba(17, 112, 238, 0.1);
  font-size: 13px;
  color: var(--ink-500);
}

.site-footer .links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 14px;
}

.site-footer a {
  color: var(--ink-500);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--blue-600);
}

.site-footer .company {
  line-height: 1.8;
}