:root {
  color-scheme: light;
  --bg: #f5f7f9;
  --surface: #ffffff;
  --surface-muted: #eef3f6;
  --field-bg: #fbfcfd;
  --text: #182127;
  --muted: #66757f;
  --line: #d6dee4;
  --accent: #006d77;
  --accent-strong: #04535c;
  --accent-soft: #d9f0ee;
  --primary-text: #ffffff;
  --warn: #9b3d20;
  --shadow: 0 18px 50px rgba(25, 38, 48, 0.12);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #10161a;
  --surface: #172026;
  --surface-muted: #233039;
  --field-bg: #10181d;
  --text: #edf4f6;
  --muted: #9dafb8;
  --line: #34444d;
  --accent: #5bc8c9;
  --accent-strong: #9ce8e4;
  --accent-soft: #153d42;
  --primary-text: #071416;
  --warn: #ffb08c;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    linear-gradient(135deg, rgba(0, 109, 119, 0.1), transparent 34rem),
    radial-gradient(circle at 85% 8%, rgba(239, 132, 91, 0.16), transparent 22rem),
    var(--bg);
  color: var(--text);
}

[data-theme="dark"] body {
  background:
    linear-gradient(135deg, rgba(91, 200, 201, 0.14), transparent 34rem),
    radial-gradient(circle at 85% 8%, rgba(255, 176, 140, 0.12), transparent 22rem),
    var(--bg);
}

button,
textarea {
  font: inherit;
}

.app-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0;
}

.workspace,
.result-panel,
.invalid-section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.workspace {
  padding: 24px;
}

.topbar,
.action-row,
.result-panel header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 0;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1.1;
}

h2 {
  margin-bottom: 0;
  font-size: 1rem;
}

h3 {
  margin-bottom: 10px;
  font-size: 0.92rem;
}

.input-grid,
.results-grid,
.invalid-grid {
  display: grid;
  gap: 16px;
}

.input-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 24px;
}

.input-panel {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

textarea {
  width: 100%;
  min-height: 260px;
  resize: vertical;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--field-bg);
  color: var(--text);
  font-weight: 400;
  line-height: 1.5;
}

textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
  outline: none;
}

.action-row {
  margin-top: 18px;
  flex-wrap: wrap;
}

.primary-button,
.ghost-button,
.icon-button,
.copy-button {
  min-height: 42px;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 800;
}

.primary-button {
  padding: 0 20px;
  background: var(--accent);
  color: var(--primary-text);
}

.primary-button:hover {
  background: var(--accent-strong);
}

.ghost-button {
  padding: 0 14px;
  background: var(--surface-muted);
  color: var(--text);
}

.ghost-button:hover {
  border-color: var(--line);
  background: var(--accent-soft);
}

.icon-button {
  width: 42px;
  padding: 0;
  background: var(--surface-muted);
  color: var(--text);
  font-size: 1.08rem;
}

.icon-button:hover {
  border-color: var(--line);
  background: var(--accent-soft);
}

.copy-button {
  min-height: 34px;
  padding: 0 12px;
  background: var(--surface-muted);
  color: var(--text);
  font-size: 0.82rem;
}

.copy-button:hover:not(:disabled) {
  border-color: var(--line);
  background: var(--accent-soft);
}

.copy-button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.summary {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.results-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 18px;
}

.result-panel {
  min-width: 0;
  padding: 18px;
}

.result-title {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 10px;
}

.result-panel header span,
details summary span {
  display: inline-grid;
  min-width: 30px;
  height: 28px;
  place-items: center;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 800;
}

.url-list {
  min-height: 64px;
  margin: 16px 0 0;
  padding-left: 20px;
  color: var(--text);
  overflow-wrap: anywhere;
}

.url-list li + li {
  margin-top: 10px;
}

.empty-state {
  color: var(--muted);
  font-style: italic;
  list-style: none;
}

.invalid-section {
  margin-top: 18px;
  padding: 16px 18px;
}

details summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
  color: var(--warn);
  font-weight: 800;
}

.invalid-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 18px;
}

.compact {
  min-height: 32px;
  margin-top: 0;
  color: var(--warn);
  font-size: 0.9rem;
}

@media (max-width: 820px) {
  .app-shell {
    width: min(100% - 20px, 1180px);
    padding: 10px 0;
  }

  .workspace {
    padding: 18px;
  }

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

  .result-panel header {
    align-items: flex-start;
  }

  .topbar-actions {
    flex-shrink: 0;
  }

  .input-grid,
  .results-grid,
  .invalid-grid {
    grid-template-columns: 1fr;
  }

  textarea {
    min-height: 190px;
  }
}