/* ─────────────────────────────────────────────────────────────
   Ifa Computing — ComputoE · styles.css
   The IFA Internet · CENProject
───────────────────────────────────────────────────────────── */

/* ── Tokens ─────────────────────────────────────────────────── */
:root {
  --bg:         #06080e;
  --bg-alt:     #070c14;
  --bg-card:    #0c1220;
  --bg-card2:   #0a0f1a;
  --border:     rgba(255,255,255,0.07);
  --border-md:  rgba(255,255,255,0.12);
  --text:       #e8ecf5;
  --text-muted: #7a8ba8;
  --gold:       #f5c518;
  --comp:       #00d9b8;
  --comp-dim:   rgba(0, 217, 184, 0.10);
  --comp-glow:  rgba(0, 217, 184, 0.22);
  --blue:       #4361ee;
  --blue-dim:   rgba(67, 97, 238, 0.10);
  --radius:     12px;
  --radius-lg:  18px;
  --shadow:     0 4px 24px rgba(0,0,0,0.5);
  --transition: 0.22s ease;
}

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

html { scroll-behavior: smooth; }

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

a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; font: inherit; }
img { max-width: 100%; }

/* ── Layout ──────────────────────────────────────────────────── */
.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
}

.section--alt {
  background: var(--bg-alt);
}

.section--cta {
  background: var(--bg);
  padding: 80px 0;
}

/* ── Section Header ──────────────────────────────────────────── */
.section__header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 64px;
}

.section__eyebrow {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--comp);
  margin-bottom: 14px;
}

.section__title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section__desc {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.75;
}

.section__cta-row {
  text-align: center;
  margin-top: 48px;
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: var(--transition);
  white-space: nowrap;
}

.btn--primary {
  background: var(--comp);
  color: #06080e;
}
.btn--primary:hover { opacity: 0.88; transform: translateY(-1px); }

.btn--ghost {
  background: rgba(255,255,255,0.06);
  color: var(--text);
  border: 1px solid var(--border-md);
}
.btn--ghost:hover { background: rgba(255,255,255,0.10); }

.btn--outline {
  background: transparent;
  color: var(--btn-col, var(--comp));
  border: 1.5px solid var(--btn-col, var(--comp));
  padding: 11px 26px;
}
.btn--outline:hover {
  background: color-mix(in srgb, var(--btn-col, var(--comp)) 12%, transparent);
}

/* ── Header ──────────────────────────────────────────────────── */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 0 24px;
  transition: background 0.3s, border-color 0.3s, backdrop-filter 0.3s;
  border-bottom: 1px solid transparent;
}

.header--scrolled {
  background: rgba(6, 8, 14, 0.88);
  backdrop-filter: blur(16px);
  border-color: var(--border);
}

.header__inner {
  max-width: 1160px;
  margin: 0 auto;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.header__back {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: color var(--transition);
  flex-shrink: 0;
}
.header__back:hover { color: var(--text); }
.header__back-arrow { font-size: 1rem; }

.header__brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.01em;
  margin-right: auto;
  color: var(--comp);
}

.header__brand-icon { font-size: 1.2rem; }
.header__brand-name { color: var(--text); }

.header__nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  padding: 6px 12px;
  font-size: 0.84rem;
  color: var(--text-muted);
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover { color: var(--text); background: rgba(255,255,255,0.06); }

.nav-link--cta {
  background: var(--comp-dim);
  color: var(--comp);
  border: 1px solid rgba(0, 217, 184, 0.25);
  margin-left: 8px;
}
.nav-link--cta:hover { background: var(--comp-glow); color: var(--comp); }

/* ── Hero ────────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 120px 24px 80px;
}

/* Circuit grid background */
.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__circuit-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 217, 184, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 217, 184, 0.045) 1px, transparent 1px),
    linear-gradient(rgba(67, 97, 238, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(67, 97, 238, 0.025) 1px, transparent 1px);
  background-size: 60px 60px, 60px 60px, 20px 20px, 20px 20px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 20%, transparent 100%);
}

.hero__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
}

.hero__glow--teal {
  width: 600px; height: 600px;
  top: -100px; left: -100px;
  background: radial-gradient(circle, rgba(0, 217, 184, 0.14) 0%, transparent 70%);
}

.hero__glow--blue {
  width: 500px; height: 500px;
  bottom: -80px; right: -80px;
  background: radial-gradient(circle, rgba(67, 97, 238, 0.12) 0%, transparent 70%);
}

/* Animated circuit nodes */
.hero__nodes {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__node {
  position: absolute;
  left: var(--nx);
  top: var(--ny);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--comp);
  animation: node-pulse var(--ns, 3s) var(--nd, 0s) ease-in-out infinite;
}

@keyframes node-pulse {
  0%, 100% { opacity: 0.15; transform: scale(1); box-shadow: none; }
  50%       { opacity: 0.9;  transform: scale(1.6); box-shadow: 0 0 10px var(--comp); }
}

/* Odu binary stream */
.hero__stream {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.hero__stream-col {
  position: absolute;
  left: var(--sc-left);
  top: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  animation: stream-fall 10s var(--sc-delay, 0s) linear infinite;
}

@keyframes stream-fall {
  0%   { transform: translateY(-100%); opacity: 0; }
  10%  { opacity: 1; }
  90%  { opacity: 0.5; }
  100% { transform: translateY(110vh); opacity: 0; }
}

.hero__stream-char {
  font-family: 'Courier New', monospace;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--comp);
  opacity: 0.18;
  animation: char-flicker 2s var(--char-delay, 0s) ease-in-out infinite alternate;
}

@keyframes char-flicker {
  from { opacity: 0.08; }
  to   { opacity: 0.28; }
}

/* IfaLine stream — I and II */
.hero__stream-col--ifaline {
  animation-duration: 13s;
}

.hero__stream-char--ifaline {
  color: #f59e0b;
  opacity: 0.15;
  animation-name: char-flicker-ifaline;
}

@keyframes char-flicker-ifaline {
  from { opacity: 0.07; }
  to   { opacity: 0.26; }
}

/* Hero content */
.hero__inner {
  position: relative;
  z-index: 2;
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.hero__eyebrow-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--comp);
  box-shadow: 0 0 8px var(--comp);
  animation: dot-blink 2s ease-in-out infinite;
}

@keyframes dot-blink {
  0%, 100% { opacity: 1; } 50% { opacity: 0.3; }
}

.hero__title {
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.0;
  margin-bottom: 20px;
}

.hero__title-ifa {
  color: var(--comp);
  display: block;
}

.hero__title-main {
  color: var(--text);
  display: block;
}

.hero__subtitle {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 20px;
  letter-spacing: 0.01em;
}

.hero__desc {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 48px;
  line-height: 1.8;
}

/* Hero stats */
.hero__stats {
  display: flex;
  justify-content: center;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.03);
  overflow: hidden;
  margin-bottom: 40px;
  backdrop-filter: blur(8px);
}

.hero__stat {
  flex: 1;
  padding: 20px 16px;
  text-align: center;
  border-right: 1px solid var(--border);
}
.hero__stat:last-child { border-right: none; }

.hero__stat-value {
  font-size: 1.9rem;
  font-weight: 800;
  color: var(--comp);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 4px;
}

.hero__stat-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero__ctas {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Pillars Section ─────────────────────────────────────────── */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-bottom: 48px;
}

.pillar-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow: hidden;
  position: relative;
}

.pillar-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--pc-accent);
  transform: scaleX(0);
  transition: transform 0.3s ease;
  transform-origin: left;
}

.pillar-card:hover { transform: translateY(-4px); border-color: var(--pc-accent); box-shadow: 0 8px 32px rgba(0,0,0,0.4); }
.pillar-card:hover::before { transform: scaleX(1); }

.pillar-card__top {
  position: absolute;
  top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--pc-accent), transparent);
  opacity: 0.5;
}

.pillar-card__icon {
  font-size: 1.6rem;
  color: var(--pc-accent);
}

.pillar-card__name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.pillar-card__abbr {
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  line-height: 1.4;
}

.pillar-card__desc {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.65;
  flex: 1;
}

.pillar-card__cta {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--pc-accent);
  margin-top: 4px;
  transition: gap var(--transition);
}

/* Computer types strip */
.comp-types {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
}

.comp-types__label {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.comp-types__row {
  display: flex;
  gap: 0;
}

.comp-type {
  flex: 1;
  padding: 12px 16px;
  border-right: 1px solid var(--border);
  border-left: 3px solid var(--ct-accent);
}
.comp-type:last-child { border-right: none; }

.comp-type__name {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 3px;
}

.comp-type__bits {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ct-accent);
  margin-bottom: 2px;
}

.comp-type__system {
  font-size: 0.68rem;
  color: var(--text-muted);
}

/* ── IfaBit Section ──────────────────────────────────────────── */
.bit-tabs {
  display: flex;
  gap: 12px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.bit-tab {
  flex: 1;
  min-width: 160px;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 16px;
  text-align: center;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
  cursor: pointer;
}

.bit-tab:hover {
  border-color: var(--bt-accent);
  background: var(--bg-card2);
}

.bit-tab--active {
  border-color: var(--bt-accent) !important;
  background: color-mix(in srgb, var(--bt-accent) 8%, var(--bg-card));
  transform: translateY(-2px);
}

.bit-tab__symbol {
  font-family: 'Courier New', monospace;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--bt-accent);
  margin-bottom: 6px;
}

.bit-tab__name {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
}

/* Bit detail card */
.bit-detail {
  background: var(--bg-card);
  border: 1px solid var(--bd-accent, var(--comp));
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 40px;
  box-shadow: 0 0 40px color-mix(in srgb, var(--bd-accent) 12%, transparent);
  transition: border-color 0.3s, box-shadow 0.3s;
}

.bit-detail__left {
  text-align: center;
}

.bit-detail__symbol-large {
  font-family: 'Courier New', monospace;
  font-size: 3.2rem;
  font-weight: 900;
  color: var(--bd-accent, var(--comp));
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.bit-detail__meta-grid {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.bit-detail__meta-item {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  text-align: center;
}

.bit-detail__meta-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.bit-detail__meta-val {
  font-size: 0.88rem;
  font-weight: 700;
}

.bit-detail__name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 14px;
}

.bit-detail__desc {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.78;
}

/* Ogbe–Oyeku pair */
.odu-pair {
  display: flex;
  gap: 0;
  align-items: center;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.odu-pair__side {
  flex: 1;
  padding: 36px 28px;
  text-align: center;
}

.odu-pair__glyph {
  font-size: 3rem;
  font-weight: 900;
  color: var(--op-col);
  font-family: 'Courier New', monospace;
  margin-bottom: 10px;
  line-height: 1;
}

.odu-pair__name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}

.odu-pair__tags {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.odu-pair__tags span {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.odu-pair__divider {
  width: 120px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 20px;
}

.odu-pair__line {
  width: 1px;
  height: 30px;
  background: var(--border-md);
}

.odu-pair__label {
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-align: center;
}

.odu-pair__arrow {
  font-size: 1.2rem;
  color: var(--comp);
}

/* ── Ifa Information Section ─────────────────────────────────── */
.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: border-color var(--transition), transform var(--transition);
  position: relative;
  overflow: hidden;
}

.info-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  background: var(--ic-accent);
  transform: scaleX(0);
  transition: transform 0.3s ease;
  transform-origin: left;
}

.info-card:hover { border-color: var(--ic-accent); transform: translateY(-3px); }
.info-card:hover::after { transform: scaleX(1); }

.info-card__icon {
  font-size: 1.5rem;
  color: var(--ic-accent);
  margin-bottom: 14px;
}

.info-card__name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}

.info-card__desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.68;
}

/* ── Algorithm Section ───────────────────────────────────────── */
.algo-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  align-items: start;
}

.algo-principles {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.algo-principle {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--ap-accent);
  border-radius: var(--radius);
  padding: 22px 24px;
  transition: transform var(--transition), border-color var(--transition);
}

.algo-principle:hover {
  transform: translateX(4px);
  border-color: var(--ap-accent);
}

.algo-principle__num {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--ap-accent);
  padding-top: 3px;
  flex-shrink: 0;
  width: 26px;
}

.algo-principle__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

.algo-principle__desc {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* Algorithm aside */
.algo-aside {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.algo-aside__card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.algo-aside__label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.algo-aside__val {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--comp);
  margin-bottom: 6px;
}

.algo-aside__sub {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.algo-aside__cta-block {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 4px;
}

.algo-aside__cta-block .btn {
  justify-content: center;
}

/* ── Ifa Language Section ────────────────────────────────────── */
.lang-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

.lang-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: border-color var(--transition), transform var(--transition);
  position: relative;
}

.lang-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--lc-accent);
  border-radius: 2px 2px 0 0;
  transform: scaleX(0);
  transition: transform 0.3s ease;
  transform-origin: left;
}

.lang-card:hover { border-color: var(--lc-accent); transform: translateY(-3px); }
.lang-card:hover::before { transform: scaleX(1); }

.lang-card__icon {
  font-family: 'Courier New', monospace;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--lc-accent);
  margin-bottom: 14px;
}

.lang-card__name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.lang-card__sub {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--lc-accent);
  margin-bottom: 12px;
}

.lang-card__desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.68;
}

/* Computing axiom blockquote */
.comp-axiom {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--comp);
  border-radius: var(--radius);
  padding: 28px 32px;
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.75;
  font-style: italic;
  margin-bottom: 0;
}

.comp-axiom cite {
  display: block;
  margin-top: 14px;
  font-size: 0.78rem;
  font-style: normal;
  font-weight: 600;
  color: var(--comp);
  letter-spacing: 0.04em;
}

/* ── CTA Block ───────────────────────────────────────────────── */
.cta-block {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  background: var(--bg-card2);
}

.cta-block__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 80% at 0% 50%, rgba(0, 217, 184, 0.09) 0%, transparent 60%),
    radial-gradient(ellipse 60% 80% at 100% 50%, rgba(67, 97, 238, 0.09) 0%, transparent 60%);
}

.cta-block__inner {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 72px 40px;
  max-width: 680px;
  margin: 0 auto;
}

.cta-block__eyebrow {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--comp);
  margin-bottom: 18px;
}

.cta-block__title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 20px;
}

.cta-block__desc {
  font-size: 0.98rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 36px;
}

.cta-block__actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Footer ──────────────────────────────────────────────────── */
.footer {
  background: #04060b;
  border-top: 1px solid var(--border);
  padding: 56px 24px 32px;
}

.footer__inner {
  max-width: 1160px;
  margin: 0 auto;
  display: flex;
  gap: 48px;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 40px;
}

.footer__brand { max-width: 280px; }

.footer__logo {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.footer__logo-icon { font-size: 1.3rem; color: var(--comp); }
.footer__logo-name { font-size: 1rem; font-weight: 700; }

.footer__tagline {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  justify-content: flex-end;
  align-items: flex-start;
  max-width: 480px;
}

.footer__link {
  font-size: 0.84rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer__link:hover { color: var(--comp); }

.footer__bottom {
  max-width: 1160px;
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer__copy {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.footer__axiom {
  font-size: 0.76rem;
  color: var(--text-muted);
  opacity: 0.6;
  font-style: italic;
  text-align: right;
}

/* ── Ifa Binary Encoding Scheme ─────────────────────────────── */
.ifa-binary {
  background: linear-gradient(180deg, var(--bg-alt) 0%, var(--bg-card2) 100%);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 52px 28px 56px;
}
.ifa-binary__inner { max-width: 900px; margin: 0 auto; }

.ifa-binary__tag {
  font-size: 0.62rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.18em; color: var(--gold); text-align: center; margin-bottom: 10px;
}
.ifa-binary__title {
  font-size: 1.9rem; font-weight: 900; letter-spacing: -0.03em; text-align: center;
  color: var(--text); margin-bottom: 6px; line-height: 1.2;
}
.ifa-binary__subtitle {
  font-size: 0.78rem; color: var(--text-muted); text-align: center;
  letter-spacing: 0.05em; margin-bottom: 20px;
}
.ifa-binary__desc {
  font-size: 0.88rem; color: var(--text-muted); line-height: 1.8; text-align: center;
  max-width: 680px; margin: 0 auto 40px;
}
.ifa-binary__desc strong { color: var(--text); font-weight: 600; }

/* ── Two-card grid ── */
.ifa-binary__duo {
  display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 36px;
}
.ifa-binary__card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
}
.ifa-binary__card--ogbe  { border-top: 3px solid var(--gold); }
.ifa-binary__card--oyeku { border-top: 3px solid var(--blue); }

/* ── Symbol display ── */
.ifa-binary__symbol {
  display: flex; flex-direction: column; align-items: center;
  padding: 26px 20px 14px; gap: 10px;
  border-bottom: 1px solid var(--border);
}
.ifa-binary__glyph {
  font-family: 'Times New Roman', Georgia, serif; font-weight: 700;
  line-height: 1; user-select: none;
}
.ifa-binary__glyph--ogbe {
  font-size: 3.6rem; color: var(--gold);
  filter: drop-shadow(0 0 14px rgba(245,197,24,0.4));
}
.ifa-binary__glyph--oyeku {
  font-size: 4.2rem; color: var(--blue);
  filter: drop-shadow(0 0 14px rgba(67,97,238,0.45));
}
.ifa-binary__glyph-label {
  font-size: 0.6rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.16em; color: var(--text-muted);
}

/* ── Card body ── */
.ifa-binary__card-body { padding: 18px 18px 22px; }
.ifa-binary__card-name {
  font-size: 1.3rem; font-weight: 900; margin-bottom: 10px; letter-spacing: -0.01em;
}
.ifa-binary__card-name--ogbe  { color: var(--gold); }
.ifa-binary__card-name--oyeku { color: var(--blue); }
.ifa-binary__card-name-dash   { color: var(--text-muted); font-weight: 400; }
.ifa-binary__card-name-sub    { color: var(--text-muted); font-weight: 600; }

.ifa-binary__card-desc {
  font-size: 0.8rem; color: var(--text-muted); line-height: 1.7;
  margin-bottom: 14px; padding-bottom: 12px; border-bottom: 1px solid var(--border);
}
.ifa-binary__meta-label {
  font-size: 0.58rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.16em; color: var(--text-muted); margin-bottom: 9px;
}

/* ── Meta-representation list ── */
.ifa-binary__metas { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.ifa-binary__meta {
  display: flex; align-items: flex-start; gap: 11px;
  background: var(--bg-card2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 9px 11px;
}
.ifa-binary__meta-glyph {
  font-family: 'Times New Roman', Georgia, serif; font-weight: 700;
  font-size: 1.1rem; line-height: 1.1; flex-shrink: 0;
  width: 26px; text-align: center; margin-top: 1px;
}
.ifa-binary__meta-glyph--ogbe     { color: var(--gold); }
.ifa-binary__meta-glyph--oyeku    { color: var(--blue); }
.ifa-binary__meta-glyph--dualline { color: var(--blue); letter-spacing: -0.18em; }
.ifa-binary__meta-glyph--inf      { color: var(--text-muted); font-style: italic; }
.ifa-binary__meta-glyph--img      { width: 26px; height: 26px; object-fit: contain; flex-shrink: 0; margin-top: 1px; }
.ifa-binary__meta-glyph--inf-img  { width: 44px; height: 44px; min-width: 44px; object-fit: contain; flex-shrink: 0; display: block; }

.ifa-binary__meta-text { flex: 1; min-width: 0; }
.ifa-binary__meta-text strong { font-size: 0.8rem; color: var(--text); display: block; margin-bottom: 2px; }
.ifa-binary__meta-text p { font-size: 0.73rem; color: var(--text-muted); line-height: 1.55; margin: 0; }

/* ── Axiom / connector + quote ── */
.ifa-binary__axiom {
  border-top: 1px solid var(--border); padding-top: 28px;
  display: flex; flex-direction: column; align-items: center; gap: 14px;
}
.ifa-binary__connector {
  font-size: 0.88rem; color: var(--text-muted); text-align: center;
  display: flex; align-items: baseline; gap: 5px; flex-wrap: wrap; justify-content: center;
}
.ifa-binary__emdash {
  font-family: 'Times New Roman', Georgia, serif; font-weight: 700;
  font-size: 1.5rem; line-height: 1;
  color: var(--comp);
  filter: drop-shadow(0 0 6px var(--comp-glow));
}
.ifa-binary__quote {
  font-size: 0.83rem; color: var(--text-muted); font-style: italic; text-align: center;
  max-width: 680px; line-height: 1.8; margin: 0;
  padding: 14px 22px;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-card);
}

/* ── Responsive ──────────────────────────────────────────────── */

/* Prevent horizontal overflow globally */
body { overflow-x: hidden; }

/* ── Tablet: ≤ 1024px ── */
@media (max-width: 1024px) {
  .pillars-grid    { grid-template-columns: repeat(3, 1fr); }
  .algo-layout     { grid-template-columns: 1fr; }
  .algo-aside      { display: grid; grid-template-columns: repeat(2, 1fr); }
  .algo-aside__cta-block { flex-direction: row; }
}

/* ── Large mobile / small tablet: ≤ 768px ── */
@media (max-width: 768px) {
  /* Layout */
  .container       { padding: 0 16px; }
  .section         { padding: 56px 0; }
  .section--cta    { padding: 56px 0; }
  .section__header { margin-bottom: 40px; }
  .section__desc   { font-size: 0.92rem; }

  /* Header */
  .header          { padding: 0 16px; }
  .header__nav     { display: none; }

  /* Hero */
  .hero            { padding: 100px 16px 60px; min-height: auto; }
  .hero__glow--teal { width: 320px; height: 320px; top: -60px; left: -60px; }
  .hero__glow--blue { width: 280px; height: 280px; bottom: -40px; right: -40px; }
  .hero__stream    { display: none; }
  .hero__eyebrow   { font-size: 0.66rem; }
  .hero__subtitle  { font-size: 0.95rem; }
  .hero__desc      { font-size: 0.9rem; margin-bottom: 32px; }
  .hero__stat-value { font-size: 1.5rem; }
  .hero__stat-label { font-size: 0.65rem; }
  .hero__ctas      { flex-direction: column; align-items: center; }
  .hero__ctas .btn { width: 100%; max-width: 320px; justify-content: center; }

  /* Pillars */
  .pillars-grid    { grid-template-columns: repeat(2, 1fr); gap: 12px; }

  /* Computer types — horizontal scroll */
  .comp-types      { padding: 18px 16px; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .comp-types__row { flex-wrap: nowrap; min-width: max-content; gap: 0; }
  .comp-type       { min-width: 130px; }

  /* IfaBit */
  .bit-tabs        { gap: 8px; }
  .bit-tab         { min-width: 140px; padding: 14px 12px; }
  .bit-detail      { grid-template-columns: 1fr; text-align: center; padding: 24px 20px; gap: 24px; }
  .bit-detail__left { margin: 0 auto; }
  .bit-detail__meta-grid { justify-content: center; }
  .bit-detail__symbol-large { font-size: 2.4rem; margin-bottom: 16px; }

  /* Odu pair */
  .odu-pair        { flex-direction: column; }
  .odu-pair__side  { padding: 24px 20px; }
  .odu-pair__divider { flex-direction: row; width: 100%; height: auto; padding: 10px 20px; }
  .odu-pair__line  { width: 30px; height: 1px; }

  /* Binary encoding */
  .ifa-binary      { padding: 40px 16px 44px; }
  .ifa-binary__title { font-size: 1.45rem; }
  .ifa-binary__duo { grid-template-columns: 1fr; }

  /* Info / Lang */
  .info-grid       { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .lang-grid       { grid-template-columns: repeat(2, 1fr); gap: 14px; }

  /* Algorithm */
  .algo-aside      { grid-template-columns: 1fr; }
  .algo-aside__cta-block { flex-direction: column; }

  /* CTA block */
  .cta-block__inner { padding: 48px 20px; }
  .cta-block__actions { flex-direction: column; align-items: center; }
  .cta-block__actions .btn { width: 100%; max-width: 320px; justify-content: center; }

  /* Footer */
  .footer          { padding: 40px 16px 24px; }
  .footer__inner   { flex-direction: column; gap: 24px; margin-bottom: 28px; }
  .footer__brand   { max-width: 100%; }
  .footer__links   { justify-content: flex-start; max-width: 100%; }
  .footer__bottom  { flex-direction: column; text-align: center; }
  .footer__axiom   { text-align: center; }

  /* Blockquote */
  .comp-axiom      { padding: 20px 18px; font-size: 0.9rem; }
}

/* ── Small mobile: ≤ 480px ── */
@media (max-width: 480px) {
  /* Layout */
  .section         { padding: 44px 0; }
  .section__header { margin-bottom: 32px; }

  /* Hero stats: 2×2 grid */
  .hero__stats     { display: grid; grid-template-columns: 1fr 1fr; }
  .hero__stat      { border-right: none; border-bottom: 1px solid var(--border); }
  .hero__stat:nth-child(odd)  { border-right: 1px solid var(--border); }
  .hero__stat:nth-child(3),
  .hero__stat:nth-child(4)    { border-bottom: none; }

  /* Pillars → single column */
  .pillars-grid    { grid-template-columns: 1fr; }

  /* Bit tabs → 2×2 */
  .bit-tabs        { display: grid; grid-template-columns: 1fr 1fr; }
  .bit-tab         { min-width: unset; }

  /* Info / Lang → single column */
  .info-grid       { grid-template-columns: 1fr; }
  .lang-grid       { grid-template-columns: 1fr; }

  /* Binary encoding */
  .ifa-binary      { padding: 32px 14px 36px; }
  .ifa-binary__title { font-size: 1.25rem; }

  /* Buttons full-width */
  .section__cta-row .btn { width: 100%; justify-content: center; }
}