:root {
  --blue: #005eb8;
  --blue-dark: #06345c;
  --navy: #061b3a;
  --magenta: #e6007e;
  --bg: #f4f8ff;
  --panel: #ffffff;
  --text: #061b3a;
  --muted: #4b5d78;
  --border: #d9e4f2;
  --shadow: 0 18px 45px rgba(0, 64, 128, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.wrap {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

.hero {
  background:
    radial-gradient(circle at 70% 18%, rgba(0, 120, 255, 0.35), transparent 34%),
    linear-gradient(135deg, #005eb8 0%, #06345c 55%, #061b3a 100%);
  color: #fff;
  padding: 42px 0;
}

.back-link {
  display: inline-block;
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  margin-bottom: 24px;
  opacity: 0.9;
}

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

.eyebrow {
  margin: 0 0 12px;
  text-transform: uppercase;
  letter-spacing: 0.17em;
  font-size: 0.95rem;
  opacity: 0.95;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(2.8rem, 6vw, 5rem);
  line-height: 1;
  font-weight: 800;
}

.lead {
  margin: 0;
  max-width: 720px;
  font-size: 1.25rem;
  line-height: 1.45;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.meta span {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  padding: 8px 14px;
  font-weight: 700;
}

.magenta-line {
  height: 7px;
  background: var(--magenta);
}

main.wrap {
  padding-top: 34px;
}

.notice-card,
.guide-section,
.help-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.notice-card {
  padding: 26px;
  margin-bottom: 28px;
  border-left: 7px solid var(--magenta);
}

.notice-card h2,
.guide-section h2,
.help-card h2 {
  margin: 0 0 8px;
  font-size: 1.7rem;
}

.notice-card p,
.help-card p {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.guide-section {
  padding: 26px;
  margin-bottom: 28px;
}

details {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 12px;
  margin: 14px 0;
  overflow: hidden;
}

summary {
  cursor: pointer;
  font-weight: 800;
  padding: 18px 20px;
  list-style-position: inside;
}

details[open] summary {
  border-bottom: 1px solid var(--border);
  background: #f8fbff;
}

details > p,
details > ul,
details > ol,
details > h3,
details > .info-box,
details > img {
  margin-left: 22px;
  margin-right: 22px;
}

details > p:first-of-type,
details > ul:first-of-type,
details > ol:first-of-type {
  margin-top: 18px;
}

details > p:last-child,
details > ul:last-child,
details > ol:last-child {
  margin-bottom: 22px;
}

ul,
ol {
  padding-left: 24px;
}

li {
  margin: 6px 0;
}

img {
  display: block;
  max-width: 520px;
  width: 100%;
  margin-top: 18px;
  margin-bottom: 22px;
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 10px 24px rgba(0, 64, 128, 0.12);
}

.info-box {
  background: #eaf3ff;
  border-left: 5px solid var(--blue);
  border-radius: 10px;
  padding: 16px 18px;
  margin-top: 18px;
  color: var(--text);
}

code {
  background: #eef4fb;
  padding: 2px 6px;
  border-radius: 5px;
}

.help-card {
  padding: 26px;
  display: grid;
  grid-template-columns: 92px 1fr auto;
  gap: 24px;
  align-items: center;
  margin-bottom: 34px;
}

.help-icon {
  width: 82px;
  height: 82px;
  border-radius: 18px;
  background: #eaf3ff;
  display: grid;
  place-items: center;
  font-size: 2.4rem;
}

.support-button {
  border: 2px solid var(--blue);
  color: var(--blue);
  text-decoration: none;
  font-weight: 700;
  padding: 13px 22px;
  border-radius: 8px;
  white-space: nowrap;
  text-align: center;
  transition: background 0.2s ease, color 0.2s ease;
}

.support-button:hover {
  background: var(--blue);
  color: #fff;
}

.footer {
  background: #eaf3ff;
  padding: 24px 0;
  text-align: center;
  color: var(--muted);
}

.footer p {
  margin: 0;
}

@media (max-width: 850px) {
  .wrap {
    width: calc(100% - 32px);
  }

  .help-card {
    grid-template-columns: 80px 1fr;
  }

  .support-button {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .hero {
    padding: 30px 0 38px;
  }

  .hero h1 {
    font-size: 2.8rem;
  }

  .lead {
    font-size: 1.08rem;
  }

  .meta span {
    width: 100%;
  }

  .notice-card,
  .guide-section,
  .help-card {
    padding: 20px;
  }

  details > p,
  details > ul,
  details > ol,
  details > h3,
  details > .info-box,
  details > img {
    margin-left: 16px;
    margin-right: 16px;
  }

  .help-card {
    grid-template-columns: 1fr;
  }

  .help-icon {
    width: 68px;
    height: 68px;
    font-size: 2rem;
  }
}