:root {
  --bg-page: #f6f8fb;
  --bg-card: #ffffff;
  --bg-panel: #eef1f6;
  --bg-code: #111827;
  --bg-code2: #0d1420;

  --text-main: #1e2b3c;
  --text-muted: #5a6a7e;
  --text-faint: #8fa0b5;
  --text-code: #e5eaf2;

  --teal: #0a9580;
  --amber: #c97a08;
  --coral: #e0284a;
  --blue: #1d5fd4;
  --green: #0d9b6c;
  --purple: #7c3aed;

  --zone-sensory: var(--teal);
  --zone-association: var(--purple);
  --zone-executive: var(--coral);

  --border: #dde3ec;
  --border2: #b8c4d4;

  --font-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-page: #07101f;
    --bg-card: #0e1828;
    --bg-panel: #0a1422;
    --bg-code: #060e1a;
    --bg-code2: #040c16;

    --text-main: #e8f0fa;
    --text-muted: #7e99b8;
    --text-faint: #3a5070;
    --text-code: #e8f0fa;

    --teal: #1dd6be;
    --amber: #f5b800;
    --coral: #ff5577;
    --blue: #4d8fff;
    --green: #2ddd9a;
    --purple: #a78bfa;

    --border: #152033;
    --border2: #253550;
  }

  body {
    background-image: radial-gradient(
      rgba(255, 255, 255, 0.035) 1px,
      transparent 1px
    ) !important;
  }

  ::selection {
    background: rgba(29, 214, 190, 0.25) !important;
  }
}

/* ── Custom Playful Scrollbar ── */
html {
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--border2) var(--bg-page);
}

::-webkit-scrollbar {
  width: 12px;
}

::-webkit-scrollbar-track {
  background: var(--bg-page);
}

::-webkit-scrollbar-thumb {
  background-color: var(--border2);
  border-radius: 6px;
  border: 3px solid var(--bg-page); /* Creates a nice padding effect */
}

::-webkit-scrollbar-thumb:hover {
  background-color: var(--teal);
}

/* ── Thematic Text Selection ── */
::selection {
  background: rgba(10, 149, 128, 0.25);
  color: inherit;
}

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

body {
  background: var(--bg-page);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.72;
  overflow-x: hidden;

  /* Ambitious/Cool: A very subtle "sparse matrix" dot grid background */
  background-image: radial-gradient(var(--border) 1px, transparent 1px);
  background-size: 32px 32px;
  background-position: -16px -16px;
}

/* ── Typography ── */
h1 {
  font-size: clamp(2.2rem, 5.5vw, 3.8rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1.08;
  margin-bottom: 1.5rem;
  text-wrap: balance;
}

h2 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  line-height: 1.2;
  text-wrap: balance;
}

p {
  margin-bottom: 1.3rem;
  font-size: 1.05rem;
  color: var(--text-muted);
}

p:last-child {
  margin-bottom: 0;
}

/* Beautifully justified text ONLY inside the main content cards */
main p {
  text-align: justify;
  text-justify: inter-word;
  hyphens: auto;
  text-wrap: pretty;
}

strong {
  color: var(--text-main);
  font-weight: 600;
}

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-panel);
  color: var(--teal);
  padding: 2px 7px;
  border-radius: 5px;
  border: 1px solid var(--border);
}

ul {
  margin: 0 0 1.3rem 22px;
  color: var(--text-muted);
}

li {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.hl-teal {
  color: var(--teal);
  font-weight: 700;
}
.hl-amber {
  color: var(--amber);
  font-weight: 700;
}
.hl-coral {
  color: var(--coral);
  font-weight: 700;
}
.hl-green {
  color: var(--green);
  font-weight: 700;
}
.hl-purple {
  color: var(--purple);
  font-weight: 700;
}

/* ── Layout ── */
.container {
  max-width: 940px;
  margin: 0 auto;
  padding: 0 28px;
}

header {
  padding: 110px 0 80px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(170deg, var(--bg-panel) 0%, var(--bg-page) 55%);
  position: relative;
  overflow: hidden;
}

header::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(
      ellipse 700px 400px at 80% 50%,
      rgba(29, 214, 190, 0.07) 0%,
      transparent 70%
    ),
    radial-gradient(
      ellipse 400px 300px at 10% 80%,
      rgba(245, 184, 0, 0.05) 0%,
      transparent 60%
    );
  pointer-events: none;
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal);
  border: 1.5px solid var(--teal);
  padding: 5px 14px;
  border-radius: 6px;
  margin-bottom: 1.5rem;
  opacity: 0.85;
}

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 58px 52px;
  margin: 5.5rem 0;
  position: relative;
  box-shadow: 0 2px 24px rgba(0, 0, 0, 0.04);
}

@media (max-width: 700px) {
  .card {
    padding: 44px 22px;
    margin: 3.5rem 0;
  }
}

.step-badge {
  position: absolute;
  top: -17px;
  left: 50px;
  background: var(--bg-card);
  color: var(--teal);
  border: 1.5px solid var(--border2);
  font-weight: 700;
  padding: 5px 18px;
  border-radius: 22px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

@media (max-width: 700px) {
  .step-badge {
    left: 22px;
  }
}

/* ── Visualization containers ── */
.vis-wrap {
  width: 100%;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  margin: 2.2rem 0;
  overflow: hidden;
  position: relative;

  /* Centers the visual canvases perfectly inside their wrappers */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.vis-wrap canvas {
  display: block;
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
}

.vis-caption {
  width: 100%;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.79rem;
  color: var(--text-muted);
  padding: 13px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
  line-height: 1.65;
}

.viz-note {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  flex-wrap: wrap;
  margin: 1.2rem 0 1.5rem;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: linear-gradient(
    180deg,
    rgba(29, 95, 212, 0.04),
    rgba(10, 149, 128, 0.03)
  );
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 4px 9px;
  border-radius: 999px;
  border: 1px solid var(--border2);
  background: rgba(29, 95, 212, 0.08);
  color: var(--blue);
  margin-top: 2px;
}

.status-pill.info {
  background: rgba(29, 95, 212, 0.08);
  color: var(--blue);
}

.status-pill.inactive {
  background: rgba(224, 40, 74, 0.08);
  border-color: rgba(224, 40, 74, 0.25);
  color: var(--coral);
}

.hint-tag {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(29, 214, 190, 0.1);
  color: var(--teal);
  border: 1px solid rgba(29, 214, 190, 0.28);
  padding: 4px 11px;
  border-radius: 6px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
  pointer-events: none;
  z-index: 2;
  animation: blink 2.5s ease-in-out infinite;
}

.hint-tag-cascade {
  left: 12px;
  right: auto;
}

@keyframes blink {
  0%,
  100% {
    opacity: 0.45;
  }
  50% {
    opacity: 1;
  }
}

@media (max-width: 700px) {
  .viz-note {
    padding: 11px 12px;
    font-size: 0.9rem;
  }
}

/* ── Code windows ── */
.code-window {
  background: var(--bg-code);
  border-radius: 14px;
  margin: 2rem 0;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.18);
  overflow: hidden;
  border: 1px solid var(--border2);
}

.code-header {
  background: rgba(255, 255, 255, 0.025);
  padding: 10px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  gap: 8px;
}

.dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.dot:nth-child(1) {
  background: #ef4444;
}
.dot:nth-child(2) {
  background: #f59e0b;
}
.dot:nth-child(3) {
  background: #22c55e;
}

/* Playful: dots pulse when hovering over code window header */
.code-header:hover .dot {
  transform: scale(1.3);
}
.code-header:hover .dot:nth-child(1) {
  transition-delay: 0s;
}
.code-header:hover .dot:nth-child(2) {
  transition-delay: 0.05s;
}
.code-header:hover .dot:nth-child(3) {
  transition-delay: 0.1s;
}

.code-fname {
  font-family: var(--font-mono);
  font-size: 0.77rem;
  color: rgba(255, 255, 255, 0.22);
  margin-left: 10px;
}

.code-body {
  padding: 20px 24px;
  overflow-x: auto;
}

pre {
  margin: 0;
  white-space: pre;
}

pre code {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  background: none;
  border: none;
  padding: 0;
  color: #cbd5e1;
  line-height: 1.7;
}

.c-c {
  color: #475569;
  font-style: italic;
}
.c-k {
  color: #c084fc;
  font-weight: 600;
}
.c-f {
  color: #60a5fa;
}
.c-n {
  color: #fb923c;
}
.c-s {
  color: #86efac;
}

/* ── Footer ── */
footer {
  text-align: center;
  padding: 64px 0;
  border-top: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text-muted);
  font-size: 0.95rem;
}

footer p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

footer .mono {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-faint);
}