.briefing { scroll-margin-top: 24px; padding-top: 36px; padding-bottom: 36px; }
.briefing-card { max-width: 820px; margin: auto; padding: clamp(20px, 4vw, 44px); border: 2px solid #87bfa0; border-radius: 22px; background: #f4fbf5; font-size: 18px; line-height: 1.8; text-align: left; overflow-wrap: anywhere; }
.briefing-card h2 { font-size: clamp(25px, 4vw, 34px); line-height: 1.5; margin: 8px 0 20px; }
.briefing-eyebrow { color: #286849; font-weight: bold; margin: 0; }
.briefing-date { font-size: clamp(23px, 4vw, 30px); font-weight: bold; }
.briefing-details { margin: 24px 0; }
.briefing-details > div { display: grid; grid-template-columns: 5em 1fr; padding: 12px 0; border-bottom: 1px solid #c5dccc; }
.briefing-details dt { font-weight: bold; }
.briefing-details dd { margin: 0; }
.briefing-map { margin: 24px 0; }
.briefing-map img { display: block; width: 100%; height: auto; border-radius: 8px; }
.briefing-map figcaption { margin-top: 8px; font-size: 16px; }
.briefing-card a { color: #235e49; text-decoration: underline; }
.briefing-card label { display: block; font-weight: bold; }
.briefing-card label span { white-space: nowrap; }
#briefing-help { margin: 6px 0 12px; }
#briefing-nickname { display: block; width: 100%; box-sizing: border-box; min-height: 58px; background: white; border: 2px solid #608b73; border-radius: 8px; padding: 12px; font: inherit; }
.briefing-card .briefing-button { display: block; width: 100%; min-height: 60px; height: auto; padding: 16px 12px; margin-top: 16px; border: 0; background: #086b37; color: white; font: inherit; font-weight: bold; line-height: 1.6; white-space: normal; cursor: pointer; }
.briefing-entry .briefing-button { box-sizing: border-box; text-align: center; text-decoration: none; }
.briefing-entry .briefing-date { font-size: clamp(21px, 3.5vw, 30px); }
.briefing-button:disabled { opacity: .6; cursor: default; }
.briefing-card :focus-visible { outline: 3px solid #174e98; outline-offset: 4px; }
#briefing-error { color: #9b2020; margin: 8px 0; }
.briefing-confirm { padding: 18px; background: white; border-left: 5px solid #31855b; font-weight: bold; }
.briefing-pc { border-top: 1px solid #b0ccb7; margin-top: 28px; padding-top: 20px; }
.briefing-pc summary { cursor: pointer; font-weight: bold; min-height: 48px; }
.briefing-friend-qr { display: block; width: 240px; max-width: 100%; height: auto; background: white; }
#briefing-message-qr { max-width: 320px; margin: 20px auto; background: white; }
#briefing-message-qr svg { display: block; width: 100%; height: auto; }
@media (max-width: 400px) { .briefing-details > div { grid-template-columns: 4em 1fr; } }
.briefing-entry .briefing-banner { max-width: none; display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: center; }
.briefing-entry { width: calc(100% - 32px); max-width: 1338px; }
.briefing-banner-map img { display: block; width: 100%; height: auto; border-radius: 10px; }
.briefing-page-main { padding-top: 24px; padding-bottom: 40px; font-size: 18px; line-height: 1.8; }
.briefing-page .briefing-page-main { max-width: 660px; }
.briefing-application { padding: 24px; border: 1px solid #87bfa0; background: #f4fbf5; border-radius: 18px; }
.briefing-target { margin: 0 0 20px; }
.briefing-application p { margin: 12px 0; }
.briefing-friend { margin-top: 20px; }
.briefing-friend summary { cursor: pointer; min-height: 48px; }
.briefing-page-main h1 { font-size: clamp(26px, 4vw, 36px); margin: 0 0 24px; }
.briefing-page-main h2 { font-size: 21px; margin: 0 0 12px; }
.briefing-page-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; padding: 28px; border: 1px solid #87bfa0; background: #f4fbf5; border-radius: 18px; }
.briefing-page-grid p { margin: 0 0 16px; }
.briefing-page-grid .briefing-map { max-width: 380px; margin: 18px 0 0; }
.briefing-page-main label { font-weight: bold; }
.briefing-page-main .briefing-button { display: block; box-sizing: border-box; width: 100%; min-height: 58px; padding: 14px; background: #086b37; color: white; border: 0; border-radius: 28px; font: inherit; font-weight: bold; cursor: pointer; }
.briefing-page-main #briefing-help { font-size: 16px; }
.briefing-page-main .briefing-confirm { padding: 12px; margin-top: 16px; }
.briefing-small { font-size: 16px; }
.briefing-page-main .briefing-pc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; padding: 16px 0; }
.briefing-page-main .briefing-friend-qr { box-sizing: content-box; padding: 16px; margin-bottom: 12px; }
.briefing-page-main :focus-visible { outline: 3px solid #174e98; outline-offset: 3px; }
@media (max-width: 759px) {
  .briefing-entry .briefing-banner, .briefing-page-grid, .briefing-page-main .briefing-pc-grid { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .briefing-page-grid { padding: 20px; }
  .briefing-page-main .briefing-friend-qr { max-width: calc(100% - 32px); }
}

/* Dedicated application page; shared top-page styles remain unchanged. */
.briefing-page .briefing-page-main { max-width: 660px; padding-top: clamp(32px, 7vh, 72px); font-size: 20px; line-height: 1.8; }
.briefing-page-main h1 { line-height: 1.5; }
.briefing-page-main label { display: block; margin-bottom: 12px; }
.briefing-page-main #briefing-nickname { min-height: 64px; font-size: 22px; }
.briefing-page-main #briefing-error:empty { display: none; }
.briefing-page-main #briefing-error { font-weight: bold; }
.briefing-page-main .briefing-button { margin-top: 24px; min-height: 68px; font-size: 24px; }
.briefing-instructions { margin: 24px 0 16px; }

#briefing-qr-panel { margin-top: 20px; padding: 16px; border: 1px solid #87bfa0; border-radius: 12px; background: #f4fbf5; }
.briefing-page-main [hidden] { display: none !important; }
.briefing-back { margin-top: 32px; }

.briefing-page .briefing-steps { list-style: none; margin: 0; padding: 0; }
.briefing-page .briefing-step-title { display: flex; align-items: flex-start; gap: 12px; margin: 0 0 16px; font-size: 22px; font-weight: bold; line-height: 1.6; }
.briefing-page .briefing-step-number { display: inline-flex; flex: 0 0 38px; width: 38px; height: 38px; justify-content: center; align-items: center; background: #086b37; color: white; border-radius: 50%; font-size: 24px; line-height: 1; }
.briefing-page .briefing-step-arrow { margin: 12px 0; color: #086b37; text-align: center; font-size: 36px; line-height: 1.2; }
.briefing-page .briefing-button { margin-top: 0; }
.briefing-page .briefing-completion { margin: 28px 0 0; padding: 18px; background: #f4fbf5; border-left: 5px solid #086b37; font-size: 21px; font-weight: bold; }
/* LINE sending guide belongs only to the application page. */
.briefing-page .briefing-line-guide { width: 100%; max-width: 500px; margin: 20px auto 0; }
.briefing-page .briefing-line-guide a { display: block; border-radius: 8px; }
.briefing-page .briefing-line-guide img { display: block; width: 100%; height: auto; border-radius: 8px; }
.briefing-page .briefing-line-guide figcaption { margin-top: 6px; font-size: 16px; text-align: center; }