:root {
  --bg-grad-1: #ffffff;
  --bg-grad-2: #eef1f5;
  --bg-grad-3: #e7ebf1;
  --text: #0d1117;
  --muted: #5a616f;
  --lead: #273246;
  --line: #dde3ec;
  --card: #ffffff;
  --surface: #fbfcff;
  --accent: #0d3b66;
  --accent-soft: #e6f0fa;
  --code: #062a4f;
  --btn-bg: #f3f8ff;
  --btn-border: #b5c9e3;
  --btn-text: #0a3f73;
  --btn-bg-hover: #e5f0fc;
  --btn-border-hover: #9eb9da;
  --focus: #5890c9;
  --ok: #007a4d;
  --error: #b42318;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-grad-1: #141a23;
    --bg-grad-2: #0f141c;
    --bg-grad-3: #0b1017;
    --text: #e8edf6;
    --muted: #a7b2c3;
    --lead: #c4cfdf;
    --line: #2d3747;
    --card: #161f2b;
    --surface: #1c2735;
    --accent: #9ac6ff;
    --accent-soft: #1f2f43;
    --code: #cae2ff;
    --btn-bg: #233447;
    --btn-border: #3d5470;
    --btn-text: #d8e8ff;
    --btn-bg-hover: #2a415a;
    --btn-border-hover: #4f6d91;
    --focus: #7fb5ff;
    --ok: #4fd28e;
    --error: #ff8892;
  }
}

:root[data-theme="dark"] {
  --bg-grad-1: #141a23;
  --bg-grad-2: #0f141c;
  --bg-grad-3: #0b1017;
  --text: #e8edf6;
  --muted: #a7b2c3;
  --lead: #c4cfdf;
  --line: #2d3747;
  --card: #161f2b;
  --surface: #1c2735;
  --accent: #9ac6ff;
  --accent-soft: #1f2f43;
  --code: #cae2ff;
  --btn-bg: #233447;
  --btn-border: #3d5470;
  --btn-text: #d8e8ff;
  --btn-bg-hover: #2a415a;
  --btn-border-hover: #4f6d91;
  --focus: #7fb5ff;
  --ok: #4fd28e;
  --error: #ff8892;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
}

body {
  color: var(--text);
  background: radial-gradient(1200px 600px at 10% -10%, var(--bg-grad-1) 0%, var(--bg-grad-2) 55%, var(--bg-grad-3) 100%);
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  line-height: 1.55;
}

.wrap {
  width: min(920px, 100% - 2rem);
  margin: 0 auto;
  padding: 2rem 0 3rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
}

.top-controls {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.brand {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
  text-decoration: none;
}

.menu {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.menu a {
  color: var(--muted);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.35rem 0.72rem;
  transition: 120ms ease;
}

.menu a:hover,
.menu a.active {
  color: var(--accent);
  border-color: var(--line);
  background: var(--card);
}

.theme-toggle {
  width: 2.2rem;
  height: 2.2rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: 120ms ease;
}

.theme-toggle:hover {
  background: var(--accent-soft);
  border-color: var(--btn-border-hover);
}

.theme-toggle:focus-visible,
.copy-btn:focus-visible,
.generate-btn:focus-visible,
.field-input:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.hero {
  margin-bottom: 0.8rem;
}

.eyebrow {
  margin: 0 0 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

h1 {
  margin: 0 0 0.7rem;
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  line-height: 1.15;
}

h2 {
  margin: 0 0 0.8rem;
  font-size: 1.15rem;
}

p {
  margin: 0;
}

.lead {
  color: var(--lead);
  max-width: 68ch;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  margin-top: 0.9rem;
}

.copy-stack {
  display: grid;
  gap: 0.8rem;
}

.copy-block {
  display: grid;
  gap: 0.35rem;
}

.copy-label {
  margin: 0;
  color: var(--muted);
  font-size: 0.89rem;
  font-weight: 600;
}

.copy-field {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  padding: 0.7rem 0.8rem;
}

code {
  font-family: "JetBrains Mono", "Cascadia Code", Consolas, monospace;
  font-size: 0.92rem;
  word-break: break-all;
  color: var(--code);
}

.copy-btn,
.generate-btn {
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--btn-text);
  border-radius: 8px;
  padding: 0.38rem 0.7rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: 120ms ease;
}

.copy-btn:hover,
.generate-btn:hover {
  background: var(--btn-bg-hover);
  border-color: var(--btn-border-hover);
}

.copy-status {
  min-height: 1.2rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.copy-status.ok {
  color: var(--ok);
  font-weight: 700;
}

.copy-status.error {
  color: var(--error);
  font-weight: 700;
}

.feature-list {
  margin: 0;
  padding-left: 1.1rem;
}

.feature-list li + li {
  margin-top: 0.2rem;
}

.feature-list a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.feature-list a:hover {
  color: var(--accent);
  border-bottom-color: currentColor;
}

.generator {
  display: grid;
  gap: 0.45rem;
}

.field-label {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
}

.field-row {
  display: flex;
  gap: 0.6rem;
}

.field-input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.63rem 0.72rem;
  font: inherit;
  color: var(--text);
  background: var(--surface);
}

.field-hint {
  color: var(--muted);
  font-size: 0.82rem;
}

.form-error {
  min-height: 1.2rem;
  color: var(--error);
  font-size: 0.83rem;
}

.option-group {
  margin-top: 0.35rem;
  display: grid;
  gap: 0.42rem;
}

.option-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
  font-size: 0.92rem;
}

.option-item input {
  margin: 0;
}

.card-link-row {
  margin-top: 0.72rem;
}

.text-link {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.text-link:hover {
  border-bottom-color: currentColor;
}

.generated-list {
  margin-top: 0.9rem;
  display: grid;
  gap: 0.8rem;
}

.download-frame {
  display: none;
  width: 0;
  height: 0;
  border: 0;
}

.legal {
  margin-top: 1.4rem;
  color: var(--muted);
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.legal a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.legal a:hover {
  color: var(--accent);
  border-bottom-color: currentColor;
}

@media (max-width: 720px) {
  .topbar {
    align-items: flex-start;
  }

  .top-controls {
    width: 100%;
    justify-content: flex-start;
  }

  .field-row,
  .copy-field {
    flex-direction: column;
    align-items: stretch;
  }

  .copy-btn,
  .generate-btn {
    width: 100%;
  }
}