:root {
  --bg: #f1f7f5;
  --panel: #ffffff;
  --line: #b6cfc8;
  --text: #173f39;
  --accent: #0d7f72;
  --danger: #cb4b2d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: radial-gradient(circle at top right, #dbece7 0%, var(--bg) 55%);
  color: var(--text);
  font-family: 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.header,
li.notice {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
}

.header {
  padding: 20px;
  margin-bottom: 16px;
}

h1,
h2,
h3,
p {
  margin: 0;
}

.sub {
  margin-top: 8px;
  opacity: 0.8;
}

.auth-actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.auth-actions button,
.notice button {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 12px;
  background: #fff;
  color: var(--text);
  cursor: pointer;
}

.auth-actions button:hover,
.notice button:hover {
  border-color: var(--accent);
}

.status,
.message {
  margin-top: 10px;
  min-height: 24px;
}

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

.inbox-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.notice {
  padding: 14px;
}

.notice .meta {
  opacity: 0.8;
  margin-top: 8px;
  font-size: 14px;
}

.notice .summary {
  margin-top: 12px;
}

.notice .buttons {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}