/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface-alt: #232736;
  --border: #2e3344;
  --text: #e8eaf0;
  --text-muted: #8b90a8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-glow: rgba(59, 130, 246, 0.15);
  --success: #22c55e;
  --radius: 10px;
  --radius-sm: 6px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f6f9;
    --surface: #ffffff;
    --surface-alt: #eef0f5;
    --border: #d1d5e0;
    --text: #1a1d2e;
    --text-muted: #5e6480;
    --accent-glow: rgba(59, 130, 246, 0.08);
  }
}

html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; width: 100%; }

/* ===== Header ===== */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}
.logo:hover { text-decoration: none; }
.logo svg { color: var(--accent); }

.site-nav {
  display: flex;
  gap: 20px;
  align-items: center;
}
.site-nav a {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}
.site-nav a:hover { color: var(--text); }

/* ===== Main Layout ===== */
.main-layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 28px;
  padding: 28px 20px;
  flex: 1;
  align-items: start;
}

@media (max-width: 860px) {
  .main-layout { grid-template-columns: 1fr; }
}

/* ===== Input Panel ===== */
.input-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  position: sticky;
  top: 72px;
}

.panel-header h1 {
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.3;
}
.subtitle {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-top: 4px;
}

.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 18px 0;
}
.preset-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
}
.preset-btn {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.82rem;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 500;
  transition: background 0.15s, border-color 0.15s;
}
.preset-btn:hover { background: var(--accent-glow); border-color: var(--accent); }
.preset-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 14px;
}
.form-grid .field:first-child { grid-column: 1 / -1; }

.field label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.field input,
.field select {
  width: 100%;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.95rem;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  outline: none;
  transition: border-color 0.15s;
}
.field input:focus,
.field select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }

.pace-display {
  margin: 20px 0;
  text-align: center;
  padding: 16px;
  background: var(--surface-alt);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.pace-label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.pace-value {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
  display: block;
  margin-top: 4px;
}

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.btn {
  font-size: 0.88rem;
  font-weight: 600;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  cursor: pointer;
  font-family: var(--font);
  transition: background 0.15s, border-color 0.15s;
  text-align: center;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-secondary {
  background: var(--surface-alt);
  color: var(--text);
}
.btn-secondary:hover { background: var(--accent-glow); border-color: var(--accent); }

.status {
  margin-top: 12px;
  font-size: 0.82rem;
  color: var(--success);
  min-height: 1.2em;
}

/* ===== Band Panel ===== */
.band-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.band-header h2 {
  font-size: 1.15rem;
  font-weight: 700;
}
.band-note {
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.band-container {
  margin-top: 16px;
  overflow-x: auto;
}

.band-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.88rem;
}
.band-table th {
  text-align: left;
  padding: 8px 14px;
  background: var(--surface-alt);
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 2px solid var(--border);
}
.band-table td {
  padding: 7px 14px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.band-table tbody tr:hover { background: var(--accent-glow); }
.band-table tbody tr:nth-child(even) { background: rgba(255,255,255,0.015); }
@media (prefers-color-scheme: light) {
  .band-table tbody tr:nth-child(even) { background: rgba(0,0,0,0.02); }
}

.band-empty {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* ===== Info Panel ===== */
.info-panel {
  grid-column: 1 / -1;
  margin-top: 8px;
}
.info-panel h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.info-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.info-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.faq-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.faq-block summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
}
.faq-block summary::-webkit-details-marker { display: none; }
.faq-block summary h3 { font-size: 1.05rem; font-weight: 700; }
.faq-block summary::after {
  content: '+';
  margin-left: auto;
  font-size: 1.3rem;
  color: var(--accent);
  font-weight: 400;
}
.faq-block[open] summary::after { content: '−'; }

.faq-block dl { margin-top: 16px; }
.faq-block dt {
  font-weight: 600;
  font-size: 0.9rem;
  margin-top: 14px;
}
.faq-block dd {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 4px;
  padding-left: 16px;
  border-left: 2px solid var(--border);
}

.version-note {
  margin-top: 20px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 24px 0;
  margin-top: auto;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.site-footer p { margin-bottom: 6px; }
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-affiliate {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

/* ===== Utilities ===== */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== Print Styles ===== */
@media print {
  body { background: #fff; color: #000; }
  .site-header,
  .site-footer,
  .input-panel,
  .info-panel,
  .site-nav,
  .actions,
  .presets,
  .pace-display,
  .version-note,
  .footer-affiliate,
  #status-msg { display: none !important; }
  .main-layout {
    display: block;
    padding: 0;
  }
  .band-panel {
    border: none;
    padding: 0;
    box-shadow: none;
  }
  .band-table {
    font-size: 9pt;
    width: auto;
  }
  .band-table th,
  .band-table td {
    padding: 3px 8px;
    border: 1px solid #ccc;
  }
  .band-header h2 {
    font-size: 12pt;
    margin-bottom: 4px;
  }
  .band-note { font-size: 8pt; }
  .band-container { overflow: visible; }
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .form-grid { grid-template-columns: 1fr 1fr; }
  .actions { grid-template-columns: 1fr 1fr; }
  .pace-value { font-size: 1.4rem; }
  .info-grid { grid-template-columns: 1fr; }
  .site-header .container { flex-wrap: wrap; }
}



/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}