/* === Mobile-first base === */
.alert {
  background-color: #ffe0e0;
  color: #b30000;
  border: 1px solid #ffb3b3;
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 16px;
  font-weight: bold;
  animation: fadeIn 0.4s ease-in-out;
}

.notice {
  background-color: #e0ffe0;
  color: #006600;
  border: 1px solid #99ff99;
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 16px;
  font-weight: bold;
  animation: fadeIn 0.4s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}


body {
  background: #f7f7f8;
  font-family: 'Inter', 'Noto Sans JP', sans-serif;
  color: #111827;
  line-height: 1.6;
  margin: 0;
}

.container {
  /* max-width: 100%; */
  /* margin: 0 ; */
  padding: 16px;             /* モバイルは余白控えめ */
}

.header {
  display: flex;
  flex-direction: column;     /* 縦積み */
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 20px;
}

.header h1 {
  font-size: 20px;            /* 少し小さめからスタート */
  font-weight: 700;
  margin: 0;
}

.user-info {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.link {
  color: #2563eb;
  text-decoration: none;
  font-weight: 500;
}
.link:hover { text-decoration: underline; }

.card {
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.06);
  padding: 16px;              /* モバイルは内側余白も少し軽く */
  margin-bottom: 16px;
}

.card h2 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 12px;
}

.border-line{
  border-top: 1px solid #e5e7eb;
  margin-top: 16px;
  padding-top: 16px;
}


.field { margin-bottom: 12px; }

.input {
  box-sizing: border-box;  
  width: 100%;
  padding: 10px 14px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  font-size: 15px;
}

/* ボタンはモバイルで“縦積み・幅100%”に */
.btn {
  box-sizing: border-box;
  display: block;
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  text-align: center;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn + .btn { margin-top: 8px; }  /* 縦の間隔 */

.btn-primary { background: #2563eb; color: #fff; }
.btn-primary:hover { background: #1e40af; }
.btn-secondary { background: #eef2ff; color: #1e40af; }
.btn-danger { background: #fee2e2; color: #991b1b; }

/* タイマーはモバイルでやや小さめ */
.timer-display {
  font-family: monospace;
  font-size: 36px;
  font-weight: 600;
  text-align: center;
  margin-bottom: 12px;
}

/* key-value行は1行で収まらない時は折り返し */
.kv {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 6px 0;
  font-size: 15px;
  flex-wrap: wrap;
}
.kv strong { font-weight: 600; }


.now-price {
  text-align: center;
  padding: 14px 6px;
  margin: 20px 0;
}

.now-price span {
  font-size: 17px;
  font-weight: 60;
  letter-spacing: 0.5px;
}

.now-price strong {
  display: block;
  font-size: 40px;
  font-weight: 8;
  margin-top: 8px;
}


/* === Larger screens (tablet+) ============================================== */
@media (min-width: 768px) {
  .container {
    max-width: 720px;
    padding: 0 20px;
    margin: 40px auto;
  }

  .header {
    flex-direction: row;       /* 横並び */
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    gap: 0;
  }

  .header h1 { font-size: 22px; }
  .card { padding: 24px; margin-bottom: 24px; }
  .card h2 { font-size: 18px; margin-bottom: 16px; }
  .field { margin-bottom: 16px; }

  /* ボタンは横並びに戻す */
  .btn-group {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 16px;
  }
  .btn { display: inline-block; width: auto; }
  .btn + .btn { margin-top: 0; }

  /* タイマー大きく */
  .timer-display { font-size: 48px; margin-bottom: 16px; }
}

/* === Desktop-wide tweaks === */
@media (min-width: 1024px) {
  .container { max-width: 820px; }
}