:root {
  color-scheme: light;
  --bg: #f5f7fa;
  --surface: #ffffff;
  --surface-strong: #eef4f8;
  --text: #17202a;
  --muted: #5d6875;
  --line: #d8e0e7;
  --primary: #146c63;
  --primary-dark: #0f524b;
  --danger: #b42318;
  --shadow: 0 12px 40px rgba(30, 42, 58, 0.08);
}

* {
  box-sizing: border-box;
}

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

button,
input,
select,
textarea,
fieldset {
  font: inherit;
}

button {
  border: 0;
  border-radius: 6px;
  background: var(--primary);
  color: white;
  cursor: pointer;
  min-height: 40px;
  padding: 0 14px;
}

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

button.secondary {
  background: var(--surface-strong);
  color: var(--text);
  border: 1px solid var(--line);
}

button.secondary:hover {
  background: #e2ebf0;
}

button.danger {
  background: var(--danger);
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: white;
  color: var(--text);
  min-height: 40px;
  padding: 8px 10px;
}

textarea {
  resize: vertical;
}

label {
  color: var(--muted);
  display: grid;
  gap: 6px;
  font-size: 0.88rem;
}

fieldset {
  border: 0;
  margin: 0;
  padding: 0;
}

legend {
  color: var(--muted);
  font-size: 0.88rem;
  margin-bottom: 6px;
}

main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 24px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  min-height: 88px;
  padding: 18px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.topbar h1 {
  margin: 0;
  font-size: 1.5rem;
  letter-spacing: 0;
}

.topbar p {
  margin: 5px 0 0;
  color: var(--muted);
}

.auth-actions {
  display: flex;
  gap: 10px;
}

.empty-state {
  min-height: 50vh;
  display: grid;
  align-content: center;
  gap: 10px;
}

.empty-state h2 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 4rem);
  line-height: 1;
  letter-spacing: 0;
  max-width: 760px;
}

.empty-state p {
  color: var(--muted);
  margin: 0;
  font-size: 1.05rem;
}

.app-grid {
  display: grid;
  grid-template-columns: minmax(0, 420px) minmax(0, 1fr);
  grid-template-areas:
    "settings list"
    "form list";
  gap: 18px;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 18px;
}

.settings-panel {
  grid-area: settings;
}

.birthday-form-panel {
  grid-area: form;
}

.birthday-list-panel {
  grid-area: list;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.section-heading h2 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: 0;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.span-2 {
  grid-column: 1 / -1;
}

.field-group {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfd;
}

.check-label {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
}

.check-label input {
  width: 18px;
  min-height: 18px;
}

.lead-day-group {
  display: grid;
  gap: 6px;
}

.lead-day-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.lead-day-option {
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  cursor: pointer;
  display: inline-flex;
  gap: 7px;
  min-height: 36px;
  padding: 6px 10px;
  user-select: none;
}

.lead-day-option:has(input:checked) {
  background: #e4f3ef;
  border-color: #7ac0b2;
}

.lead-day-option input {
  accent-color: var(--primary);
  min-height: 16px;
  width: 16px;
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

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

.birthday-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfd;
}

.birthday-row h3 {
  margin: 0;
  font-size: 1rem;
}

.birthday-row p {
  margin: 4px 0 0;
  color: var(--muted);
  line-height: 1.4;
}

.row-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.preview-list {
  margin-top: 14px;
  display: grid;
  gap: 8px;
}

.preview-item {
  padding: 10px 12px;
  border-radius: 6px;
  background: var(--surface-strong);
  color: var(--text);
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  max-width: min(360px, calc(100vw - 36px));
  background: #17202a;
  color: white;
  border-radius: 8px;
  padding: 12px 14px;
  box-shadow: var(--shadow);
}

.hidden {
  display: none !important;
}

@media (max-width: 860px) {
  main {
    padding: 16px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .app-grid {
    grid-template-columns: 1fr;
    grid-template-areas:
      "settings"
      "form"
      "list";
  }

  .form-grid,
  .field-group {
    grid-template-columns: 1fr;
  }

  .span-2 {
    grid-column: auto;
  }

  .birthday-row {
    grid-template-columns: 1fr;
  }

  .row-actions,
  .form-actions {
    justify-content: stretch;
  }

  .row-actions button,
  .form-actions button {
    flex: 1;
  }
}