body {
    font-family: "Helvetica Neue", Arial, sans-serif;
    background-color: #f4f7fa;
    margin: 0;
    color: #333;
}

.container {
    max-width: 480px;
    margin: 0 auto;
    background: #ffffff;
    min-height: 100vh;
    padding: 24px;
    box-sizing: border-box;
}

header { text-align: center; padding: 20px 0 20px; }
.date-badge { background: #002d72; color: #fff; font-size: 0.7rem; padding: 4px 12px; border-radius: 4px; font-weight: bold; margin-bottom: 20px; display: inline-block; }
.brand-logo { font-size: 2.2rem; font-weight: bold; color: #287dfa; letter-spacing: -0.03em; }
h1 { font-size: 1.1rem; margin: 10px 0 0; }
.hero-desc { font-size: 0.9rem; color: #666; margin-top: 5px; font-weight: bold; }

/* カード */
.action-card {
    border: 1px solid #e1e8f0;
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 20px;
    text-align: center;
}
.trip-theme { border-top: 5px solid #287dfa; background: #fbfdff; }

.section-title { font-size: 1rem; font-weight: bold; margin-bottom: 8px; text-align: left; }
.small-info { font-size: 0.8rem; color: #888; margin-bottom: 15px; text-align: left; line-height: 1.4; }

/* リンクボタン */
.btn-trip {
    display: block; background: #287dfa; color: #fff; text-decoration: none; font-weight: bold; padding: 16px; border-radius: 50px; font-size: 1.1rem; box-shadow: 0 4px 0 #1a5dbb; transition: 0.2s;
}
.btn-trip:active { transform: translateY(2px); box-shadow: 0 2px 0 #1a5dbb; }

/* コピーボックス */
.copy-box { display: flex; background: #fff; border: 2px solid #002d72; border-radius: 12px; overflow: hidden; }
#referralCode { flex: 1; border: none; padding: 12px; font-size: 1.2rem; font-weight: bold; text-align: center; color: #002d72; width: 60%; outline: none; }
#copyBtn { background: #002d72; color: #fff; border: none; padding: 0 20px; cursor: pointer; font-weight: bold; transition: 0.2s; }
.copy-message { display: none; color: #28a745; font-size: 0.8rem; font-weight: bold; margin-top: 8px; text-align: center; }

/* ステップ */
.step-flow { display: flex; flex-direction: column; gap: 12px; margin-top: 25px; }
.step-box { background: #f8fafc; border-radius: 10px; padding: 12px; display: flex; align-items: center; gap: 12px; }
.step-box.destaque { border: 1px solid #287dfa; background: #fff; }
.step-num { width: 24px; height: 24px; background: #287dfa; color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.75rem; font-weight: bold; flex-shrink: 0; }
.step-box p { font-size: 0.85rem; margin: 0; color: #444; }

footer { text-align: center; font-size: 0.7rem; color: #cbd5e1; margin-top: 40px; }