/* ---------------------------------------------------------------------
   Theme tokens
--------------------------------------------------------------------- */
:root {
  --bg: #0a0d12;
  --bg-elevated: #10141b;
  --bg-panel: #12161d;
  --bg-inset: #0d1117;
  --border: #232a35;
  --border-strong: #333d4d;
  --text: #e6edf3;
  --text-dim: #8b96a5;
  --text-faint: #5b6572;

  --accent: #ff8a3d;
  --accent-dim: #d97530;
  --accent-bg: rgba(255, 138, 61, 0.12);

  --danger: #ff5470;
  --danger-bg: rgba(255, 84, 112, 0.13);
  --success: #3ddc97;
  --success-bg: rgba(61, 220, 151, 0.13);
  --info: #5ec8f8;
  --info-bg: rgba(94, 200, 248, 0.13);
  --warn: #f5c344;
  --warn-bg: rgba(245, 195, 68, 0.13);

  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "Fira Code", Consolas, "Liberation Mono", monospace;

  --radius: 7px;
  --radius-sm: 4px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px rgba(0, 0, 0, 0.35);
  --max-width: 1120px;
}

:root[data-theme="light"] {
  --bg: #f4f5f7;
  --bg-elevated: #ffffff;
  --bg-panel: #ffffff;
  --bg-inset: #f0f1f4;
  --border: #dde1e7;
  --border-strong: #c3c9d3;
  --text: #1b2028;
  --text-dim: #576070;
  --text-faint: #8b93a3;

  --accent: #c85e0d;
  --accent-dim: #a44e0b;
  --accent-bg: rgba(200, 94, 13, 0.09);

  --danger: #c81e4f;
  --danger-bg: rgba(200, 30, 79, 0.09);
  --success: #14824f;
  --success-bg: rgba(20, 130, 79, 0.1);
  --info: #0969da;
  --info-bg: rgba(9, 105, 218, 0.09);
  --warn: #9a6700;
  --warn-bg: rgba(154, 103, 0, 0.1);

  --shadow: 0 1px 2px rgba(20, 24, 32, 0.06), 0 12px 32px rgba(20, 24, 32, 0.08);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f4f5f7;
    --bg-elevated: #ffffff;
    --bg-panel: #ffffff;
    --bg-inset: #f0f1f4;
    --border: #dde1e7;
    --border-strong: #c3c9d3;
    --text: #1b2028;
    --text-dim: #576070;
    --text-faint: #8b93a3;
    --accent: #c85e0d;
    --accent-dim: #a44e0b;
    --accent-bg: rgba(200, 94, 13, 0.09);
    --danger: #c81e4f;
    --danger-bg: rgba(200, 30, 79, 0.09);
    --success: #14824f;
    --success-bg: rgba(20, 130, 79, 0.1);
    --info: #0969da;
    --info-bg: rgba(9, 105, 218, 0.09);
    --warn: #9a6700;
    --warn-bg: rgba(154, 103, 0, 0.1);
    --shadow: 0 1px 2px rgba(20, 24, 32, 0.06), 0 12px 32px rgba(20, 24, 32, 0.08);
  }
}

/* ---------------------------------------------------------------------
   Reset + base
--------------------------------------------------------------------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, p { margin: 0; }

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

code, pre, .mono { font-family: var(--mono); }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

section.section { padding: 88px 0; border-bottom: 1px solid var(--border); }
section.section:last-of-type { border-bottom: none; }

.eyebrow {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-bg);
}

.section h2 {
  font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2.1rem);
  font-weight: 650;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}

.section-intro {
  color: var(--text-dim);
  max-width: 640px;
  font-size: 1.02rem;
  margin-bottom: 40px;
}

/* ---------------------------------------------------------------------
   Nav
--------------------------------------------------------------------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 58px;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 9px;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 15px;
  color: var(--text);
  white-space: nowrap;
}
.brand .dot { color: var(--accent); }
.brand .tag {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  border: 1px solid var(--border-strong);
  border-radius: 100px;
  padding: 2px 8px;
}

.nav-links {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-links::-webkit-scrollbar { display: none; }

.nav-links a {
  color: var(--text-dim);
  font-size: 13.5px;
  font-weight: 500;
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}
.nav-links a:hover { color: var(--text); text-decoration: none; background: var(--bg-elevated); }

.theme-toggle {
  border: 1px solid var(--border-strong);
  background: var(--bg-elevated);
  color: var(--text-dim);
  border-radius: var(--radius-sm);
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  cursor: pointer;
  flex: none;
}
.theme-toggle:hover { color: var(--text); border-color: var(--text-faint); }
.theme-toggle svg { width: 16px; height: 16px; }
:root[data-theme="light"] .icon-moon { display: none; }
:root:not([data-theme="light"]) .icon-sun { display: none; }

/* ---------------------------------------------------------------------
   Buttons / badges / pills
--------------------------------------------------------------------- */
.btn {
  font-family: var(--sans);
  font-size: 13.5px;
  font-weight: 600;
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn:hover { border-color: var(--text-faint); }
.btn-accent { background: var(--accent); border-color: var(--accent); color: #14100a; }
.btn-accent:hover { background: var(--accent-dim); border-color: var(--accent-dim); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.badge {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  border-radius: 4px;
  text-transform: uppercase;
  display: inline-block;
  line-height: 1.5;
}
.badge-high { color: var(--danger); background: var(--danger-bg); }
.badge-medium { color: var(--warn); background: var(--warn-bg); }
.badge-low { color: var(--info); background: var(--info-bg); }
.badge-sim { color: var(--text-dim); background: var(--bg-inset); border: 1px solid var(--border-strong); }
.badge-real { color: var(--success); background: var(--success-bg); }

.note {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 13.5px;
  color: var(--text-dim);
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}
.note svg { flex: none; width: 16px; height: 16px; margin-top: 1px; color: var(--accent); }
.note strong { color: var(--text); }

/* ---------------------------------------------------------------------
   Hero
--------------------------------------------------------------------- */
.hero { padding-top: 72px; }
.hero .wrap { display: grid; gap: 44px; }

.hero h1 {
  font-size: clamp(2.1rem, 1.5rem + 3vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.08;
  max-width: 15ch;
}
.hero h1 span { color: var(--accent); }

.hero-lede {
  font-size: 1.08rem;
  color: var(--text-dim);
  max-width: 60ch;
  margin-top: 18px;
}

.hero-note { max-width: 620px; margin-top: 22px; }

/* diagram */
.diagram-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 28px 22px;
  box-shadow: var(--shadow);
}

.diagram-svg { width: 100%; height: auto; display: block; }

.diagram-track-bg { fill: none; stroke: var(--border-strong); stroke-width: 2; }
.diagram-window-rect { fill: var(--danger-bg); }
.diagram-window-label { fill: var(--text-faint); font-family: var(--mono); font-size: 10.5px; letter-spacing: .04em; text-transform: uppercase; }

.diagram-node circle { fill: var(--bg-panel); stroke: var(--border-strong); stroke-width: 2; }
.diagram-node text { fill: var(--text-dim); font-family: var(--mono); font-size: 11px; font-weight: 600; }
.diagram-node.pulse-check circle { animation: pulseRing 3.2s ease-in-out infinite; }
.diagram-node.pulse-use circle { animation: pulseRing 3.2s ease-in-out infinite; animation-delay: 1.7s; }

@keyframes pulseRing {
  0%, 8% { stroke: var(--accent); filter: drop-shadow(0 0 0 var(--accent)); }
  22% { stroke: var(--border-strong); filter: none; }
  100% { stroke: var(--border-strong); filter: none; }
}

.file-good { opacity: 1; animation: fileSwapOut 3.2s steps(1) infinite; }
.file-bad { opacity: 0; animation: fileSwapIn 3.2s steps(1) infinite; }

@keyframes fileSwapOut {
  0%, 39% { opacity: 1; }
  40%, 100% { opacity: 0; }
}
@keyframes fileSwapIn {
  0%, 39% { opacity: 0; }
  40%, 100% { opacity: 1; }
}

.diagram-link {
  opacity: 0;
  animation: linkFlash 3.2s steps(1) infinite;
}
@keyframes linkFlash {
  0%, 38% { opacity: 0; }
  40%, 100% { opacity: 1; }
}

.diagram-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 22px;
}
.diagram-step {
  font-size: 12.5px;
  color: var(--text-faint);
  border-top: 2px solid var(--border-strong);
  padding-top: 9px;
}
.diagram-step b { display: block; color: var(--text-dim); font-family: var(--mono); font-size: 11px; letter-spacing: .04em; margin-bottom: 3px; }
.diagram-step.s1 { animation: stepActive 3.2s ease-in-out infinite; }
.diagram-step.s2 { animation: stepActive 3.2s ease-in-out infinite; animation-delay: 1.05s; }
.diagram-step.s3 { animation: stepActive 3.2s ease-in-out infinite; animation-delay: 1.9s; }
@keyframes stepActive {
  0%, 4% { border-color: var(--accent); }
  0%, 4% { color: var(--text); }
  18%, 100% { border-color: var(--border-strong); color: var(--text-faint); }
}

/* ---------------------------------------------------------------------
   Panels / cards shared by sections 2-4
--------------------------------------------------------------------- */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.panel-head h3 { font-size: 14px; font-family: var(--mono); font-weight: 600; color: var(--text-dim); letter-spacing: .01em; }
.panel-body { padding: 22px; }

/* ---------------------------------------------------------------------
   Simulator
--------------------------------------------------------------------- */
.sim-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 20px; align-items: start; }

.sim-controls { display: grid; gap: 22px; }
.control label {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 8px;
  font-family: var(--mono);
}
.control label .val { color: var(--text); }
.control input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}
.sim-actions { display: flex; gap: 10px; margin-top: 4px; }

.sim-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 6px; }
.stat {
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}
.stat .n { font-family: var(--mono); font-size: 1.5rem; font-weight: 700; line-height: 1.1; }
.stat .l { font-size: 11px; color: var(--text-faint); text-transform: uppercase; letter-spacing: .04em; margin-top: 4px; }
.stat.hit .n { color: var(--danger); }

.sim-track-wrap {
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  position: relative;
  overflow: hidden;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.sim-track {
  position: relative;
  height: 10px;
  border-radius: 6px;
  background: var(--border);
}
.sim-window {
  position: absolute;
  top: -3px;
  bottom: -3px;
  background: var(--danger-bg);
  border-left: 2px dashed var(--danger);
  border-right: 2px dashed var(--danger);
  border-radius: 3px;
}
.sim-particle {
  position: absolute;
  top: 50%;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background: var(--text-faint);
  transition: left 0.9s cubic-bezier(0.2, 0.6, 0.3, 1), opacity 0.3s ease 0.6s;
}
.sim-particle.hit { background: var(--danger); box-shadow: 0 0 10px var(--danger); }
.sim-particle.miss { background: var(--text-faint); opacity: .55; }
.sim-legend { display: flex; gap: 18px; margin-top: 16px; font-size: 12px; color: var(--text-faint); }
.sim-legend span { display: inline-flex; align-items: center; gap: 6px; }
.sim-legend i { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.sim-legend .i-hit { background: var(--danger); }
.sim-legend .i-miss { background: var(--text-faint); }
.sim-legend .i-window { background: var(--danger-bg); border: 1px solid var(--danger); }

/* ---------------------------------------------------------------------
   Real results
--------------------------------------------------------------------- */
.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-size: 12.5px;
  color: var(--text-dim);
  font-family: var(--mono);
  margin-bottom: 26px;
}
.meta-row b { color: var(--text); font-weight: 600; }

.compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.compare-col h4 {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .03em;
  text-transform: uppercase;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.compare-col.vuln h4 { color: var(--danger); }
.compare-col.patched h4 { color: var(--success); }

.bar-row { margin-bottom: 16px; }
.bar-row .bar-label { display: flex; justify-content: space-between; font-size: 12.5px; color: var(--text-dim); margin-bottom: 6px; }
.bar-row .bar-label b { color: var(--text); font-family: var(--mono); }
.bar-track { height: 10px; border-radius: 6px; background: var(--bg-inset); border: 1px solid var(--border); overflow: hidden; }
.bar-fill { height: 100%; border-radius: 6px; transition: width .6s ease; }
.bar-fill.vuln { background: var(--danger); }
.bar-fill.patched { background: var(--success); }

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-faint);
  font-size: 13.5px;
}
.empty-state code {
  display: inline-block;
  margin-top: 10px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  color: var(--text-dim);
  font-size: 12.5px;
}

/* ---------------------------------------------------------------------
   Scanner viewer
--------------------------------------------------------------------- */
.scan-summary { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 28px; }

.finding-file { margin-bottom: 22px; }
.finding-file > .file-name {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-dim);
  padding: 10px 4px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 14px;
}

.finding {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
}
.finding-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
  background: var(--bg-inset);
  cursor: pointer;
  user-select: none;
  flex-wrap: wrap;
}
.finding-head .pattern { font-family: var(--mono); font-size: 13px; color: var(--text); }
.finding-head .fn { font-size: 12px; color: var(--text-faint); }
.finding-head .chev { margin-left: auto; color: var(--text-faint); transition: transform .15s ease; }
.finding.open .chev { transform: rotate(90deg); }

.finding-detail { display: none; padding: 14px; }
.finding.open .finding-detail { display: block; }

.finding-meta { display: flex; gap: 22px; font-size: 12.5px; color: var(--text-dim); margin-bottom: 12px; flex-wrap: wrap; }
.finding-meta code { color: var(--text); }

.code-block {
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.65;
}
.code-line { display: flex; }
.code-line .ln {
  flex: none;
  width: 42px;
  text-align: right;
  padding-right: 12px;
  color: var(--text-faint);
  user-select: none;
  border-right: 1px solid var(--border);
}
.code-line .txt { padding-left: 12px; white-space: pre; color: var(--text); }
.code-line.mark-check { background: var(--accent-bg); }
.code-line.mark-check .ln { color: var(--accent); font-weight: 700; }
.code-line.mark-use { background: var(--danger-bg); }
.code-line.mark-use .ln { color: var(--danger); font-weight: 700; }

.tok-kw { color: #ff7ab2; }
.tok-str { color: var(--success); }
.tok-num { color: var(--info); }
.tok-comment { color: var(--text-faint); font-style: italic; }
.tok-builtin { color: var(--accent); }
.tok-def { color: #7ee1ff; }

/* ---------------------------------------------------------------------
   Footer
--------------------------------------------------------------------- */
footer {
  padding: 44px 0 60px;
  color: var(--text-faint);
  font-size: 13px;
}
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 14px; }

/* ---------------------------------------------------------------------
   Responsive
--------------------------------------------------------------------- */
@media (max-width: 860px) {
  .sim-grid { grid-template-columns: 1fr; }
  .compare-grid { grid-template-columns: 1fr; }
  .scan-summary { grid-template-columns: repeat(2, 1fr); }
  .diagram-steps { grid-template-columns: 1fr; gap: 8px; }
  section.section { padding: 56px 0; }
}

@media (max-width: 560px) {
  .nav-links { display: none; }
}