:root {
  --bg: #fdfdfc;
  --text: #1a1a1a;
  --muted: #555;
  --line: #ddd;
  --line-strong: #ccc;
  --panel: #ffffff;
  --panel-soft: #f7f7f5;
  --success-bg: #f3f8f2;
  --success-border: #b7cbb2;
  --error-bg: #fbf1f1;
  --error-border: #d7aaaa;
  --warning-bg: #faf7ee;
  --warning-border: #d7c59a;
  --button-bg: #1a1a1a;
  --button-bg-hover: #000;
  --button-text: #fff;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: serif;
  line-height: 1.6;
}

.container {
  max-width: 680px;
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

h1,
h2,
h3 {
  font-weight: normal;
  letter-spacing: 0.02em;
}

h1 {
  font-size: 2.1rem;
  margin-bottom: 0.35rem;
}

h2 {
  font-size: 1.3rem;
  margin-top: 2.5rem;
  margin-bottom: 0.9rem;
}

p {
  margin: 0 0 1rem 0;
}

blockquote {
  margin: 2rem 0;
  padding-left: 1.5rem;
  border-left: 2px solid var(--line-strong);
  font-style: italic;
  color: #333;
}

ul {
  margin-left: 1.2rem;
}

ul.clean {
  list-style: none;
  padding-left: 0;
  margin-left: 0;
}

ul.clean li {
  margin-bottom: 1.15rem;
}

a {
  color: var(--text);
}

a:hover {
  text-decoration: underline;
}

hr {
  margin: 4rem 0;
  border: none;
  border-top: 1px solid var(--line);
}

label {
  display: block;
  margin-bottom: 1rem;
}

label span.label-text {
  display: block;
  margin-bottom: 0.35rem;
}

input,
textarea {
  width: 100%;
  padding: 0.8rem 0.85rem;
  font-family: serif;
  font-size: 1rem;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--line-strong);
  border-radius: 0;
  outline: none;
  box-shadow: var(--shadow);
}

textarea {
  min-height: 120px;
  resize: vertical;
}

input:focus,
textarea:focus {
  border-color: #999;
}

button {
  margin-top: 1rem;
  padding: 0.7rem 1.2rem;
  font-size: 0.95rem;
  font-family: serif;
  background: var(--button-bg);
  color: var(--button-text);
  border: none;
  cursor: pointer;
}

button:hover {
  background: var(--button-bg-hover);
}

button:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.panel {
  margin-top: 1.5rem;
  padding: 1rem 1.1rem;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.response {
  margin-top: 1.5rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  background: var(--panel);
  white-space: pre-wrap;
  word-break: break-word;
  box-shadow: var(--shadow);
}

.response[hidden] {
  display: none;
}

.response.success {
  background: var(--success-bg);
  border-color: var(--success-border);
}

.response.error {
  background: var(--error-bg);
  border-color: var(--error-border);
}

.response.warning {
  background: var(--warning-bg);
  border-color: var(--warning-border);
}

.response-title {
  display: block;
  margin-bottom: 0.45rem;
  font-weight: bold;
}

.response-body {
  margin: 0;
}

.help-list {
  margin: 0.5rem 0 0 1.2rem;
}

.small {
  font-size: 0.94rem;
  color: var(--muted);
}

.centered-intro {
  margin-bottom: 2rem;
}

.hidden {
  display: none !important;
}