* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 24px 16px;
  background: #f7f8fb;
  color: #333;
  font-family: sans-serif;
  text-align: center;
}

.container {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
}

h1 {
  margin: 12px 0 4px;
  font-size: clamp(24px, 5vw, 36px);
}

.subtitle {
  margin: 0 0 32px;
  color: #666;
}

button {
  border: 0;
  border-radius: 12px;
  padding: 14px 28px;
  background: #1686bd;
  color: #fff;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
}

button:hover {
  opacity: 0.85;
}

.choices {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.choice {
  padding: 8px;
  border: 2px solid #e1e5eb;
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
}

.choice img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.choice:hover {
  border-color: #1686bd;
}

[hidden],
.hidden {
  display: none !important;
}

/* 管理画面 */

.admin-container {
  max-width: 900px;
  text-align: left;
}

.site-title {
  margin-bottom: 28px;
  text-align: center;
}

.panel {
  padding: 28px;
  margin: 20px auto;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.panel h2 {
  margin: 0 0 12px;
  font-size: 21px;
}

.narrow {
  max-width: 460px;
}

.muted {
  color: #777;
}

.small {
  font-size: 13px;
  line-height: 1.7;
}

.error {
  color: #c0392b;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 7px;
  margin-bottom: 20px;
}

.field label {
  font-size: 14px;
  font-weight: bold;
}

.field input {
  width: 100%;
  min-height: 46px;
  padding: 10px 12px;
  border: 1px solid #d8dce3;
  border-radius: 9px;
  background: #fff;
  color: #333;
  font-size: 16px;
}

.field input:focus {
  outline: 2px solid rgba(22, 134, 189, 0.2);
  border-color: #1686bd;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 11px 20px;
  border: 0;
  border-radius: 9px;
  background: #202020;
  color: #fff;
  font-size: 14px;
  font-weight: bold;
  text-decoration: none;
  cursor: pointer;
}

.btn.secondary {
  background: #eef0f3;
  color: #333;
}

.btn:hover {
  opacity: 0.82;
}

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

.admin-actions {
  justify-content: space-between;
  margin: 20px 0;
}

.admin-nav {
  display: flex;
  gap: 8px;
  margin: 20px 0;
  padding-bottom: 10px;
  border-bottom: 1px solid #ddd;
}

.admin-nav button {
  padding: 11px 20px;
  border-radius: 9px 9px 0 0;
  background: transparent;
  color: #555;
  font-size: 14px;
}

.admin-nav button.active {
  background: #202020;
  color: #fff;
}

.admin-divider {
  height: 1px;
  margin: 28px 0;
  border: 0;
  background: #e5e7eb;
}

.admin-image-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.admin-image-card {
  min-width: 0;
  padding: 12px;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  background: #fff;
}

.admin-image-card img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  border-radius: 8px;
  background: #f7f8fb;
}

.admin-image-name {
  margin: 10px 0 4px;
  font-weight: bold;
  overflow-wrap: anywhere;
}

.admin-image-status {
  margin: 4px 0 12px;
  color: #777;
  font-size: 13px;
}

.admin-image-card .actions {
  display: grid;
  grid-template-columns: 1fr;
}

.admin-image-card .btn {
  width: 100%;
  padding: 9px 10px;
  font-size: 13px;
}

#login-form .btn,
#image-form > .btn {
  width: 100%;
}

#message,
#login-message {
  min-height: 1.5em;
  margin-top: 10px;
}

/* スマートフォン */

@media (max-width: 600px) {
  body {
    padding: 16px 10px;
  }

  .admin-container {
    padding: 0;
  }

  .panel {
    padding: 20px 16px;
    border-radius: 12px;
  }

  .admin-image-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .admin-actions {
    gap: 8px;
  }

  .admin-actions .btn {
    flex: 1;
    padding: 10px;
  }
}