:root {
  --bg: #0c0f14;
  --bg-elevated: #141a24;
  --bg-input: #0e131c;
  --border: rgba(94, 234, 212, 0.12);
  --accent: #5eead4;
  --text: #e8edf5;
  --text-muted: #8b98ab;
  --danger: #f87171;
  --success: #6ee7b7;
  --warn: #fbbf24;
  --radius: 12px;
  --shadow: 0 24px 48px rgba(0, 0, 0, 0.45);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(ellipse 120% 80% at 50% -20%, rgba(94, 234, 212, 0.08), transparent),
    radial-gradient(ellipse 80% 50% at 100% 50%, rgba(56, 189, 248, 0.06), transparent),
    var(--bg);
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

.breadcrumb {
  margin: 0 0 1rem;
  font-size: 0.88rem;
}

.breadcrumb a {
  color: var(--accent);
}

header.hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.55rem, 3.5vw, 2.05rem);
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #f0fdfa 0%, var(--accent) 55%, #38bdf8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-guide {
  max-width: 48rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.hero-guide p {
  margin: 0 0 0.75rem;
}

.hero-guide a {
  color: var(--accent);
}

.workspace {
  display: grid;
  gap: 1rem;
}

.panel {
  padding: 1.1rem 1.15rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(20, 26, 36, 0.92);
  box-shadow: var(--shadow);
}

label {
  display: grid;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 600;
}

select,
input[type="number"] {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border-radius: 0.75rem;
  border: 1px solid rgba(148, 163, 184, 0.18);
  background: var(--bg-input);
  color: var(--text);
  font: inherit;
}

.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 0.25rem;
}

.volume-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
}

.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.85rem;
}

.preset-btn {
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.22);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
}

.preset-btn:hover {
  border-color: rgba(94, 234, 212, 0.45);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1rem;
}

button {
  font: inherit;
  cursor: pointer;
}

.btn-primary,
.btn-secondary {
  padding: 0.55rem 1rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
}

.btn-primary {
  background: linear-gradient(135deg, #14b8a6, #0d9488);
  color: #042f2e;
}

.btn-secondary {
  border-color: rgba(148, 163, 184, 0.22);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
}

.btn-secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#status {
  margin-top: 0.75rem;
  font-size: 0.9rem;
}

#status[data-tone="error"] {
  color: var(--danger);
}

#status[data-tone="success"] {
  color: var(--success);
}

#results-empty {
  padding: 1.25rem;
  border-radius: var(--radius);
  border: 1px dashed rgba(148, 163, 184, 0.22);
  color: var(--text-muted);
  text-align: center;
}

.result-title {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
}

.muted {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0 0 0.75rem;
}

.muted a {
  color: var(--accent);
}

.safety {
  margin: 0.75rem 0 0;
  padding: 0.65rem 0.8rem;
  border-radius: 0.65rem;
  border: 1px solid rgba(251, 191, 36, 0.35);
  background: rgba(251, 191, 36, 0.08);
  color: #fde68a;
  font-size: 0.88rem;
}

.table-wrap {
  overflow: auto;
  margin: 0.5rem 0 0.75rem;
}

.site-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.site-table th,
.site-table td {
  padding: 0.55rem 0.6rem;
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
  text-align: left;
  vertical-align: top;
}

.site-table th {
  color: var(--text-muted);
  font-size: 0.76rem;
  text-transform: uppercase;
}

.muted-cell {
  color: var(--text-muted);
  font-size: 0.82rem;
}

.page-guide > h2 {
  margin: 0 0 0.75rem;
  font-size: 1.15rem;
}

.page-guide-body p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.58;
}

.page-guide-body p + p,
.page-guide-body ul + p,
.page-guide-body p + ul {
  margin-top: 0.65rem;
}

.page-guide-body .guide-lead {
  color: var(--text);
  font-size: 1rem;
}

.page-guide-body a {
  color: var(--accent);
}

.page-guide-body .guide-section {
  margin-top: 1.25rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--border);
}

.page-guide-body .guide-section h3 {
  margin: 0 0 0.5rem;
  color: var(--accent);
  font-size: 1.02rem;
}

.page-guide-body ul {
  margin: 0.45rem 0 0;
  padding-left: 1.25rem;
  color: var(--text-muted);
  font-size: 0.93rem;
  line-height: 1.55;
}

.page-guide-body li + li {
  margin-top: 0.35rem;
}

@media (max-width: 720px) {
  main {
    padding-top: 1.5rem;
  }

  .actions {
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
  }
}