:root {
  color-scheme: light;
  --bg: #f5f6f8;
  --panel: #ffffff;
  --text: #15181d;
  --muted: #667085;
  --border: #d8dde6;
  --danger: #b42318;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.viewer-page {
  background: #e8eaee;
}

.viewer {
  width: min(100%, 1200px);
  margin: 0 auto;
  padding: 12px 8px 24px;
}

.viewer .slide {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 0 12px;
  background: white;
  box-shadow: var(--shadow);
}

.status {
  padding: 16px;
  text-align: center;
  color: var(--muted);
}

.admin {
  width: min(100%, 920px);
  margin: 0 auto;
  padding: 16px;
}

.admin h1 {
  margin: 0 0 16px;
  font-size: 24px;
}

.admin h2 {
  margin: 0 0 12px;
  font-size: 18px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  margin-bottom: 14px;
  box-shadow: var(--shadow);
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

input[type="file"] {
  display: block;
  width: 100%;
  margin-bottom: 12px;
}

button {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  border-radius: 6px;
  padding: 8px 12px;
  cursor: pointer;
}

button:hover {
  background: #f3f5f8;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

button.danger {
  border-color: #f0b4b0;
  color: var(--danger);
}

.actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.hint {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.slide-list {
  margin: 0;
  padding-left: 20px;
  word-break: break-all;
}

.slide-list li {
  margin: 4px 0;
}

.message {
  min-height: 20px;
  color: var(--muted);
}

.message.error {
  color: var(--danger);
}

@media (max-width: 640px) {
  .admin {
    padding: 10px;
  }

  .panel {
    padding: 12px;
  }
}