:root {
  --bg: #0a0a0f;
  --surface: #12121a;
  --surface-2: #1a1a25;
  --border: #2a2a3a;
  --border-light: #222233;
  --text: #e8e8f0;
  --text-secondary: #9898b0;
  --text-muted: #606078;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-dim: rgba(99, 102, 241, 0.15);
  --red: #ef4444;
  --red-dim: rgba(239, 68, 68, 0.15);
  --amber: #f59e0b;
  --amber-dim: rgba(245, 158, 11, 0.12);
  --green: #22c55e;
  --green-dim: rgba(34, 197, 94, 0.12);
  --radius: 8px;
  --radius-lg: 12px;
  --mono: 'SF Mono', 'Cascadia Code', 'Fira Code', 'JetBrains Mono', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Hero ── */

.hero {
  text-align: center;
  padding: 80px 24px 48px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-dim) 0%, transparent 70%);
  pointer-events: none;
}

.hero-logo {
  width: 240px;
  height: auto;
  margin-bottom: 24px;
  position: relative;
}

.hero h1 {
  font-size: 56px;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #fff 0%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
  position: relative;
}

.hero .tagline {
  font-size: 20px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 32px;
}

.install-cmd {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 20px;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.2s;
}

.install-cmd:hover {
  border-color: var(--accent);
}

.install-cmd .dollar {
  color: var(--text-muted);
  user-select: none;
}

.install-cmd .copy-hint {
  font-size: 11px;
  color: var(--text-muted);
  font-family: 'Inter', system-ui, sans-serif;
}

.hero-links {
  margin-top: 20px;
  display: flex;
  justify-content: center;
  gap: 12px;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: var(--accent-dim);
  color: var(--accent-light);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
}

.hero-btn:hover {
  background: rgba(99, 102, 241, 0.25);
  border-color: var(--accent);
}

/* ── Problem ── */

.problem {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px 64px;
  text-align: center;
}

.problem-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.problem-card .headline {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.problem-card .subtext {
  color: var(--text-secondary);
  font-size: 15px;
}

.problem-card .highlight {
  color: var(--red);
  font-weight: 600;
}

.problem-card .fix {
  color: var(--green);
  font-weight: 600;
}

/* ── Demo Section ── */

.demo-section {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.demo-section > h2 {
  text-align: center;
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 8px;
}

.demo-section > .subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 15px;
  margin-bottom: 32px;
}

.demo-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 1200px) {
  .demo-layout {
    grid-template-columns: 1fr 420px;
  }
}

/* ── Demo Controls ── */

.demo-controls {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 20px;
}

.controls-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.controls-header h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.controls-buttons {
  display: flex;
  gap: 8px;
}

.btn {
  padding: 8px 16px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: white;
}

.btn-primary:hover {
  background: var(--accent-light);
}

.btn-secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
}

.btn-reset {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn-reset:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

/* ── Toggles ── */

.toggles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 8px;
  margin-bottom: 16px;
}

.toggle-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius);
  background: var(--surface-2);
  cursor: pointer;
  transition: background 0.15s;
  user-select: none;
}

.toggle-item:hover {
  background: var(--border-light);
}

.toggle-item.active {
  background: var(--accent-dim);
  outline: 1px solid var(--accent);
}

.toggle-switch {
  width: 36px;
  height: 20px;
  border-radius: 10px;
  background: var(--border);
  position: relative;
  flex-shrink: 0;
  transition: background 0.2s;
}

.toggle-switch::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: all 0.2s;
}

.toggle-item.active .toggle-switch {
  background: var(--accent);
}

.toggle-item.active .toggle-switch::after {
  left: 18px;
  background: white;
}

.toggle-label {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.3;
}

.toggle-item.active .toggle-label {
  color: var(--text);
}

/* ── CSS Editor ── */

.css-editor-section {
  margin-bottom: 0;
}

.css-editor-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.css-editor {
  width: 100%;
  min-height: 80px;
  max-height: 160px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text);
  resize: vertical;
  line-height: 1.5;
}

.css-editor:focus {
  outline: none;
  border-color: var(--accent);
}

.css-editor::placeholder {
  color: var(--text-muted);
}

/* ── Sample UI Frame ── */

.sample-ui-frame {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
}

.sample-ui-frame-inner {
  width: 1440px;
  height: 900px;
  transform-origin: top left;
  /* Scale is set dynamically by JS based on container width */
}

.sample-ui-frame iframe {
  width: 1440px;
  height: 900px;
  border: none;
  display: block;
}

.frame-label {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.6);
  color: white;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
  z-index: 10;
  pointer-events: none;
}

/* ── Results Panel ── */

.results-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.results-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.results-header h3 {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.results-count {
  font-size: 13px;
  color: var(--text-muted);
}

.results-body {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  max-height: 520px;
}

.results-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 200px;
  color: var(--text-muted);
  text-align: center;
  gap: 12px;
}

.results-empty .icon {
  font-size: 32px;
  opacity: 0.4;
}

.results-empty p {
  font-size: 14px;
}

/* ── Issue Cards ── */

.issue-group {
  margin-bottom: 16px;
}

.issue-group-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 8px;
  padding-left: 4px;
}

.issue-card {
  background: var(--surface-2);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 12px;
  margin-bottom: 8px;
  font-size: 13px;
}

.issue-card.error {
  border-left: 3px solid var(--red);
}

.issue-card.warning {
  border-left: 3px solid var(--amber);
}

.issue-title {
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.severity-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.severity-dot.error { background: var(--red); }
.severity-dot.warning { background: var(--amber); }

.issue-selector {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent-light);
  margin-bottom: 6px;
  word-break: break-all;
}

.issue-detail {
  color: var(--text-secondary);
  font-size: 12px;
  white-space: pre-line;
  line-height: 1.5;
}

.issue-children {
  margin-top: 8px;
  padding: 8px 0 0;
  border-top: 1px solid var(--border-light);
}

.issue-children-title {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.issue-child-selector {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-secondary);
  padding: 1px 0 1px 12px;
  border-left: 2px solid var(--border);
}

.issue-changes {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border-light);
}

.issue-changes-title {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.style-change {
  font-family: var(--mono);
  font-size: 11px;
  padding: 2px 0;
  color: var(--text-secondary);
}

.style-change .prop { color: var(--accent-light); }
.style-change .old { color: var(--red); text-decoration: line-through; opacity: 0.7; }
.style-change .new { color: var(--green); }
.style-change.inert { opacity: 0.5; }

/* ── How It Works ── */

.how-section {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px 80px;
  text-align: center;
}

.how-section h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 40px;
}

.how-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 700px) {
  .how-steps {
    grid-template-columns: 1fr;
  }
}

.how-step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
}

.how-step .step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent-light);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
}

.how-step h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.how-step p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Why Boxy ── */

.why-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.why-section h2 {
  font-size: 32px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 8px;
}

.why-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: 36px;
}

.why-subtitle em {
  color: var(--text);
  font-style: normal;
  font-weight: 600;
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

@media (max-width: 800px) {
  .why-grid { grid-template-columns: 1fr; }
}

.why-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
}

.why-card.featured {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(99,102,241,0.06) 0%, var(--surface) 60%);
}

.why-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.why-verdict {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 10px;
  border-radius: var(--radius);
  margin-bottom: 16px;
}

.why-verdict.good {
  background: var(--green-dim);
  color: var(--green);
}

.why-verdict.bad {
  background: var(--red-dim);
  color: var(--red);
}

.why-card ul {
  list-style: none;
  padding: 0;
}

.why-card ul li {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
  padding: 5px 0 5px 20px;
  position: relative;
}

.why-card ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--border);
}

.why-card.featured ul li::before {
  background: var(--accent);
}

/* ── Usage ── */

.quickstart {
  max-width: 740px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.quickstart h2 {
  font-size: 32px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 40px;
}

.usage-step {
  margin-bottom: 24px;
}

.usage-step-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.usage-step-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
}

.usage-step-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.code-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.7;
  overflow-x: auto;
  color: var(--text-secondary);
  white-space: pre;
}

.code-block .dollar { color: var(--text-muted); user-select: none; }
.code-block .kw { color: var(--accent-light); }
.code-block .str { color: var(--green); }
.code-block .fn { color: #e2b714; }
.code-block .cmt { color: var(--text-muted); }
.code-block .err { color: var(--red); }
.code-block .css-diff { color: var(--amber); }

/* ── Footer ── */

.page-footer {
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 14px;
}

.page-footer a {
  color: var(--accent-light);
  text-decoration: none;
}

.page-footer a:hover {
  text-decoration: underline;
}

/* ── Highlight overlay for demo ── */

.boxy-highlight {
  outline: 2px dashed var(--red) !important;
  outline-offset: 1px;
  position: relative;
}

.boxy-highlight::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(239, 68, 68, 0.08);
  pointer-events: none;
}