:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --text: #172033;
  --muted: #667085;
  --border: #d9e0ea;
  --primary: #1d4ed8;
  --primary-hover: #1e40af;
  --danger: #b42318;
  --success: #027a48;
  --shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

.portal-header {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.portal-header-inner {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
  padding: 18px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.portal-header h1 {
  margin: 0;
  font-size: 20px;
}

.portal-main {
  width: min(960px, calc(100% - 32px));
  margin: 24px auto 64px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 20px;
}

.status-panel {
  padding: 14px 18px;
  box-shadow: none;
}

.status-panel p {
  margin: 0;
}

.status-panel[data-type="success"] {
  border-color: rgba(2, 122, 72, 0.35);
  color: var(--success);
}

.status-panel[data-type="error"] {
  border-color: rgba(180, 35, 24, 0.35);
  color: var(--danger);
}

.hidden {
  display: none !important;
}

.form {
  display: grid;
  gap: 16px;
}

label {
  display: grid;
  gap: 6px;
  font-weight: 700;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  font: inherit;
  background: #fff;
}

textarea {
  resize: vertical;
}

.button {
  appearance: none;
  border: 0;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  padding: 12px 18px;
  cursor: pointer;
}

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

.button-secondary {
  background: #eef2f7;
  color: var(--text);
}

.button-secondary:hover {
  background: #e2e8f0;
}

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

.room-info {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 16px 0 0;
}

.room-info div {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  background: #f8fafc;
}

.room-info dt {
  color: var(--muted);
  font-size: 13px;
}

.room-info dd {
  margin: 4px 0 0;
  font-weight: 700;
}

.section-title-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.message-list {
  display: grid;
  gap: 12px;
  margin: 18px 0 24px;
}

.message {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px;
  background: #fff;
}

.message-admin {
  background: #f8fbff;
  border-color: rgba(29, 78, 216, 0.22);
}

.message-meta {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 6px;
}

.message-body {
  margin: 0;
  white-space: pre-wrap;
}

.message-form {
  border-top: 1px solid var(--border);
  padding-top: 20px;
}

@media (max-width: 720px) {
  .portal-header-inner,
  .portal-main {
    width: min(100% - 20px, 960px);
  }

  .panel {
    padding: 18px;
    border-radius: 14px;
  }

  .room-info {
    grid-template-columns: 1fr;
  }

  .section-title-row {
    align-items: stretch;
    flex-direction: column;
  }
}