:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --color-page: #eef3f7;
  --color-surface: #ffffff;
  --color-surface-muted: #f8fafc;
  --color-muted-surface: #f8fafc;
  --color-text: #17212b;
  --color-heading: #10202e;
  --color-muted: #52616f;
  --color-border: #dbe3ea;
  --color-border-strong: #c8d3dd;
  --color-primary: #1f7a8c;
  --color-primary-hover: #196779;
  --color-primary-soft: #eaf6f8;
  --color-primary-border: #9bc4d0;
  --color-secondary: #e6edf3;
  --color-secondary-hover: #d8e3ec;
  --color-secondary-text: #253443;
  --color-success: #166534;
  --color-success-bg: #eef8f0;
  --color-success-border: #9fd7aa;
  --color-warning: #9a5b00;
  --color-warning-bg: #fff7e6;
  --color-warning-border: #f3cf7a;
  --color-error: #b42318;
  --color-error-bg: #fff1f0;
  --color-error-border: #f0a8a0;
  --color-disabled: #8a97a3;
  --shadow-card: 0 12px 30px rgba(22, 34, 45, 0.08);
  --shadow-action: 0 8px 18px rgba(31, 122, 140, 0.2);
  background: var(--color-page);
  color: var(--color-text);
}

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(180deg, #f7fafc 0, var(--color-page) 260px, var(--color-page) 100%);
}

main {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 34px 0 42px;
}

h1,
h2,
h3,
p {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  color: var(--color-heading);
  font-size: 32px;
  font-weight: 720;
  line-height: 1.18;
}

h2 {
  color: var(--color-heading);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.28;
}

h3 {
  color: var(--color-text);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.35;
}

a {
  color: var(--color-primary-hover);
}

.page-header {
  margin-bottom: 24px;
  padding-left: 4px;
}

.page-subtitle,
.note {
  max-width: 880px;
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.65;
}

.note {
  max-width: none;
  font-size: 14px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-sizing: border-box;
  padding: 22px;
  box-shadow: var(--shadow-card);
}

label {
  display: block;
  color: #344252;
  font-size: 14px;
  font-weight: 700;
}

input,
textarea {
  display: block;
  width: 100%;
  box-sizing: border-box;
  margin-top: 8px;
  border: 1px solid var(--color-border-strong);
  border-radius: 6px;
  padding: 11px 12px;
  background: #fbfdff;
  color: var(--color-text);
  font: inherit;
  transition: border-color 0.16s ease, box-shadow 0.16s ease, background 0.16s ease;
}

textarea {
  resize: vertical;
  font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  white-space: pre;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-surface);
  box-shadow: 0 0 0 3px rgba(31, 122, 140, 0.16);
}

.actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}

button,
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 6px;
  min-width: 112px;
  min-height: 40px;
  padding: 0 16px;
  background: var(--color-primary);
  color: #ffffff;
  cursor: pointer;
  font: inherit;
  font-weight: 650;
  text-decoration: none;
  transition: background 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease, opacity 0.16s ease;
}

button[hidden],
.button-link[hidden] {
  display: none;
}

.button-compact {
  min-width: 84px;
  min-height: 36px;
  padding: 0 12px;
  font-size: 13px;
}

.button-wide {
  min-width: 150px;
}

button:hover,
.button-link:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-action);
  transform: translateY(-1px);
}

button.secondary,
.button-link.secondary {
  background: var(--color-secondary);
  color: var(--color-secondary-text);
}

button.secondary:hover,
.button-link.secondary:hover {
  background: var(--color-secondary-hover);
  box-shadow: 0 8px 18px rgba(48, 64, 80, 0.12);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  color: var(--color-disabled);
  box-shadow: none;
  transform: none;
}

button:disabled:hover {
  background: var(--color-primary);
  box-shadow: none;
  transform: none;
}

button.secondary:disabled:hover {
  background: var(--color-secondary);
}

.status,
.copy-status {
  min-height: 20px;
  margin-top: 12px;
  color: var(--color-muted);
  font-size: 14px;
  word-break: break-word;
}

.status:not(:empty),
.copy-status:not(:empty) {
  border-left: 3px solid transparent;
  border-radius: 6px;
  padding: 7px 9px;
  background: #f4f7fa;
}

.copy-status {
  font-size: 12px;
  line-height: 1.5;
}

.status.success,
.copy-status.success {
  border-left-color: var(--color-success-border);
  background: var(--color-success-bg);
  color: var(--color-success);
}

.status.warning,
.copy-status.warning {
  border-left-color: var(--color-warning-border);
  background: var(--color-warning-bg);
  color: var(--color-warning);
}

.status.error,
.copy-status.error {
  border-left-color: var(--color-error-border);
  background: var(--color-error-bg);
  color: var(--color-error);
}

.inline-code {
  border-radius: 4px;
  padding: 1px 5px;
  background: #eef2f6;
  color: #243b53;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 12px;
}

.result-box {
  margin-top: 16px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 16px;
  background: var(--color-surface-muted);
}

@media (max-width: 860px) {
  main {
    width: min(100% - 24px, 720px);
    padding: 22px 0 30px;
  }

  button,
  .button-link {
    width: 100%;
  }

  h1 {
    font-size: 27px;
  }
}