:root {
  --bg: #0f1115;
  --panel: #171a21;
  --border: #262b36;
  --text: #e6e8ec;
  --muted: #9aa2b1;
  --accent: #5b8def;
  --accent-hover: #4a7ee0;
  --accent-contrast: #ffffff;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fa;
    --panel: #ffffff;
    --border: #e2e5ea;
    --text: #1b1f27;
    --muted: #6b7280;
    --accent: #3b6fe0;
    --accent-hover: #2f5bc0;
    --accent-contrast: #ffffff;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Pretendard, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  width: 320px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.login-card h1 {
  font-size: 20px;
  margin: 0 0 8px;
}

.login-card label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
}

.login-card input {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  font-family: inherit;
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease,
    transform 0.05s ease, box-shadow 0.15s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover {
  background: var(--border);
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border-color: var(--border);
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 500;
}

.btn-ghost:hover {
  color: var(--text);
  background: var(--border);
}

.login-card .btn {
  width: 100%;
}

.error {
  color: #e5484d;
  font-size: 13px;
  margin: 0;
}

.app {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  background: var(--panel);
  overflow-y: auto;
}

.sidebar-header {
  padding: 16px;
}

.sidebar-header h1 {
  font-size: 16px;
  margin: 0;
}

.header-actions {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 0 12px 16px;
  border-bottom: 1px solid var(--border);
}

.header-actions .btn {
  width: 100%;
  justify-content: flex-start;
  border-color: transparent;
}

.header-actions .btn:hover {
  border-color: var(--border);
}

.date-list {
  padding: 8px;
}

.date-group h2 {
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 12px 8px 4px;
  margin: 0;
}

.date-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 8px;
  border: none;
  background: transparent;
  color: var(--text);
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
}

.date-item:hover {
  background: var(--border);
}

.date-item.active {
  background: var(--accent);
  color: white;
}

.content {
  flex: 1;
  overflow-y: auto;
  padding: 32px 40px;
}

.placeholder {
  color: var(--muted);
}

.markdown-body {
  max-width: 760px;
  margin: 0 auto;
  line-height: 1.7;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  line-height: 1.3;
}

.markdown-body a {
  color: var(--accent);
}

.markdown-body pre {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  overflow-x: auto;
}

.markdown-body code {
  font-family: 'SF Mono', Consolas, monospace;
  font-size: 13px;
}

.admin-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 360px;
}

.admin-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
}

.admin-form input[type='text'],
.admin-form input[type='password'] {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-size: 14px;
}

.checkbox-label {
  flex-direction: row !important;
  align-items: center;
  gap: 8px !important;
}

.admin-form .btn {
  width: fit-content;
}

.admin-form hr {
  width: 100%;
  border: none;
  border-top: 1px solid var(--border);
  margin: 4px 0;
}

.detail-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}

.detail-label {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.success {
  color: #2f9e44;
  font-size: 13px;
  margin: 0;
}