:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --subtext: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --border: #dbe3ef;
  --success: #ecfdf5;
  --danger: #fef2f2;
  --info: #eff6ff;
  --warning: #fffbeb;
}

* { box-sizing: border-box; }

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

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  width: min(100%, 760px);
  margin: 0 auto;
  padding: 0 16px;
}

.app-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
}

.header-row {
  min-height: 60px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.brand {
  font-weight: 700;
  color: var(--text);
}

.header-nav {
  display: flex;
  gap: 12px;
  font-size: 14px;
}

.main-content {
  padding-top: 20px;
  padding-bottom: 36px;
}

.card, .sub-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 16px;
}

.sub-card {
  margin-top: 12px;
}

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

.flash {
  border-radius: 14px;
  padding: 12px 14px;
  margin-bottom: 12px;
  border: 1px solid var(--border);
}
.flash-success { background: var(--success); }
.flash-danger { background: var(--danger); }
.flash-info { background: var(--info); }
.flash-warning { background: var(--warning); }

h1 {
  margin: 0 0 12px;
  font-size: 24px;
}
h2 {
  margin: 0 0 8px;
  font-size: 18px;
}

.form-group {
  margin-bottom: 14px;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
}

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

textarea {
  min-height: 110px;
  resize: vertical;
}

.button {
  display: inline-block;
  width: 100%;
  border: none;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  text-align: center;
  padding: 12px 16px;
  border-radius: 14px;
  cursor: pointer;
}

.button:hover {
  background: var(--primary-dark);
  text-decoration: none;
}

.button.secondary {
  background: #fff;
  color: var(--primary);
  border: 1px solid var(--primary);
}

.button-list {
  display: grid;
  gap: 10px;
}

.grid-two {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.list-item {
  border-top: 1px solid var(--border);
  padding-top: 10px;
  margin-top: 10px;
}

.errors {
  margin: 6px 0 0;
  padding-left: 18px;
  color: #b91c1c;
  font-size: 13px;
}

.sub-link {
  margin-top: 12px;
  color: var(--subtext);
  font-size: 14px;
}

.preline {
  white-space: pre-line;
}

@media (min-width: 640px) {
  .grid-two {
    grid-template-columns: 1fr 1fr;
  }
}