/* Home page — the command center for Codex Course */

.hero {
  position: relative;
  padding: 72px 0 60px;
  overflow: hidden;
  min-height: 72vh;
  display: flex; align-items: center;
}
.hero-grid-bg {
  position: absolute; inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image:
    linear-gradient(var(--rule) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 50% at 50% 40%, black 30%, transparent 75%);
}
.hero-scanline {
  position: absolute; inset: 0; z-index: 1;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent 3px,
    color-mix(in oklch, var(--cyan-ink) 6%, transparent) 3px,
    color-mix(in oklch, var(--cyan-ink) 6%, transparent) 4px
  );
  opacity: 0.3;
  mask-image: radial-gradient(ellipse 40% 40% at 70% 20%, black, transparent 70%);
}
.hero-inner { position: relative; z-index: 2; width: 100%; }

.hero-rail {
  display: flex; align-items: baseline; gap: 16px;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-3);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 28px;
}
.hero-rail .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 10px var(--cyan); animation: pulse 2s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
.hero-rail .spacer { flex: 1; height: 1px; background: var(--rule); max-width: 120px; }

.hero-title {
  font-family: var(--mono);
  font-size: clamp(2.6rem, 7vw, 6rem);
  font-weight: 700;
  letter-spacing: -0.05em;
  line-height: 0.98;
  margin: 0;
  text-wrap: balance;
  color: var(--ink);
}
.hero-title .l1, .hero-title .l2 { display: block; }
.hero-title .l2 { color: var(--ink-3); }
.hero-title .l2 .blink-caret {
  color: var(--cyan-ink);
  animation: termBlink 1s step-end infinite;
}
.hero-title .l2 em {
  font-style: normal;
  color: var(--ink);
  background: linear-gradient(180deg, transparent 55%, color-mix(in oklch, var(--cyan) 45%, transparent) 55%);
  padding: 0 4px;
}

.hero-lede {
  margin-top: 26px;
  font-size: clamp(1.05rem, 1.4vw, 1.2rem);
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 640px;
  font-family: var(--sans);
}

.hero-cta { display: flex; gap: 10px; margin-top: 32px; flex-wrap: wrap; align-items: center; }
.hero-meta {
  margin-top: 24px;
  display: flex; gap: 22px; flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}
.hero-meta b { color: var(--ink); font-weight: 600; }

/* DIAGRAM — the signature hero visual */
.hero-diagram {
  margin-top: 44px;
  padding: 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  background: var(--paper);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.hd-head {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px;
  background: var(--paper-2);
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}
.hd-head .dots { display: inline-flex; gap: 5px; }
.hd-head .dots span { width: 9px; height: 9px; border-radius: 50%; background: var(--rule-2); }
.hd-head .title { margin-left: auto; }
.hd-body {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  align-items: stretch;
  min-height: 230px;
}
@media (max-width: 780px) { .hd-body { grid-template-columns: 1fr; } }
.hd-col {
  padding: 20px 22px;
  display: flex; flex-direction: column; gap: 8px;
  border-right: 1px solid var(--rule);
  position: relative;
}
@media (max-width: 780px) { .hd-col { border-right: 0; border-bottom: 1px solid var(--rule); } }
.hd-col:last-child { border-right: 0; }
.hd-col .label {
  font-family: var(--mono); font-size: 0.66rem;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-3);
  display: flex; align-items: center; gap: 8px;
}
.hd-col .label::before {
  content: ''; width: 5px; height: 5px; background: var(--cyan); border-radius: 50%;
}
.hd-col .label .num { margin-left: auto; color: var(--ink-4); font-weight: 500; }
.hd-col h3 {
  font-size: 1rem; font-family: var(--mono); font-weight: 600;
  color: var(--ink); margin-top: 2px;
}
.hd-col p {
  font-size: 0.86rem; color: var(--ink-2); line-height: 1.5;
  font-family: var(--sans);
}
.hd-col .mini {
  margin-top: auto;
  padding: 8px 10px;
  background: oklch(0.17 0.015 250);
  color: oklch(0.9 0.012 240);
  border-radius: 5px;
  font-family: var(--mono);
  font-size: 0.72rem;
  line-height: 1.5;
  white-space: pre-wrap;
}
.hd-col .mini .k { color: oklch(0.82 0.08 220); }
.hd-col .mini .c { color: oklch(0.55 0.01 240); font-style: italic; }
.hd-col .mini .s { color: oklch(0.85 0.1 150); }
/* arrow between columns */
.hd-col + .hd-col::before {
  content: '▸'; position: absolute;
  left: -8px; top: 28px;
  color: var(--cyan-ink);
  font-size: 0.85rem;
  background: var(--paper); padding: 0 2px;
}
@media (max-width: 780px) { .hd-col + .hd-col::before { display: none; } }

/* stats band */
.stats-band { padding: 0 0 60px; }
.stats-bar {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: var(--rule);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
}
@media (max-width: 640px){ .stats-bar { grid-template-columns: 1fr 1fr; } }
.stat {
  background: var(--paper);
  padding: 24px 22px;
}
.stat .n {
  font-family: var(--mono);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--ink);
  line-height: 1;
}
.stat .l {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: 8px;
}

/* section heads */
.section-head {
  max-width: 680px;
  margin-bottom: 36px;
}
.section-head h2 { margin-top: 10px; }
.section-head p {
  margin-top: 12px;
  color: var(--ink-2);
  font-size: 1.02rem;
  line-height: 1.55;
}

/* TRACKS */
.tracks { padding: 56px 0 40px; }
.track + .track { margin-top: 56px; }
.track-head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 20px;
  align-items: center;
  padding: 12px 0 14px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 22px;
}
@media (max-width: 780px){ .track-head { grid-template-columns: 1fr; } }
.track-badge {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--cyan-ink);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 5px 10px;
  border: 1px solid color-mix(in oklch, var(--cyan) 35%, var(--rule));
  background: var(--cyan-wash);
  border-radius: 4px;
  font-weight: 600;
  white-space: nowrap;
  width: fit-content;
}
.track-head h2 {
  font-size: clamp(1.3rem, 2vw, 1.6rem);
  font-family: var(--mono);
  font-weight: 600;
}
.track-head .hint {
  color: var(--ink-3);
  font-size: 0.88rem;
  margin-top: 4px;
  font-family: var(--mono);
}
.track-prog {
  display: flex; flex-direction: column; align-items: flex-end; gap: 6px;
  min-width: 120px;
}
.track-prog-bar {
  width: 120px; height: 4px;
  background: var(--rule);
  border-radius: 2px;
  overflow: hidden;
}
.track-prog-bar > div {
  height: 100%; background: var(--cyan);
  transition: width .4s cubic-bezier(.2,.7,.2,1);
}
.track-prog-num {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--ink-2);
}
.track-prog-num .m { color: var(--ink-4); }

/* LESSON CARDS */
.lesson-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
@media (max-width: 980px){ .lesson-grid { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 620px){ .lesson-grid { grid-template-columns: 1fr; } }

.lesson-card {
  display: flex; flex-direction: column;
  padding: 20px 18px 18px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  text-decoration: none;
  position: relative;
  overflow: hidden;
  transition: border-color .2s, transform .2s, box-shadow .2s, background .2s;
  min-height: 200px;
}
.lesson-card::after {
  content: '';
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 2px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform .25s cubic-bezier(.2,.7,.2,1);
}
.lesson-card:hover {
  border-color: var(--cyan-ink);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  background: var(--paper);
}
.lesson-card:hover::after { transform: scaleY(1); }

.lesson-card .num {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--cyan-ink);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 600;
  display: flex; align-items: center; gap: 8px;
}
.lesson-card .num .bracket { color: var(--ink-4); font-weight: 400; }
.lesson-card h3 {
  margin-top: 8px;
  font-size: 1.08rem;
  color: var(--ink);
  line-height: 1.25;
  font-family: var(--mono);
  font-weight: 600;
}
.lesson-card .sub {
  color: var(--ink-2);
  font-size: 0.88rem;
  margin-top: 8px;
  line-height: 1.5;
  font-family: var(--sans);
}
.lesson-card .hook {
  color: var(--ink-3);
  font-size: 0.82rem;
  margin-top: 12px;
  font-family: var(--mono);
  font-style: italic;
  border-left: 2px solid var(--rule-2);
  padding-left: 10px;
  flex: 1;
}
.lesson-card .foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--rule);
  font-size: 0.72rem;
  color: var(--ink-3);
  font-family: var(--mono);
  letter-spacing: 0.04em;
}
.lesson-card .arrow {
  color: var(--cyan-ink);
  font-weight: 600;
}

.lesson-card.done {
  background: color-mix(in oklch, var(--ok) 4%, var(--paper));
  border-color: color-mix(in oklch, var(--ok) 25%, var(--rule));
}
.lesson-card.done .check {
  position: absolute;
  top: 14px; right: 14px;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--ok);
  color: white;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 0.7rem; font-weight: 700;
}
.lesson-card.done .arrow { color: var(--ok); }

/* PROGRESS SECTION */
.progress-section { padding: 40px 0 60px; }
.progress-panel {
  background: var(--ink);
  color: oklch(0.92 0.01 240);
  border-radius: 20px;
  padding: 40px;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 40px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.progress-panel::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(oklch(0.3 0.02 250) 1px, transparent 1px),
    linear-gradient(90deg, oklch(0.3 0.02 250) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.4;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 60% at 20% 20%, black, transparent 70%);
}
.progress-panel > * { position: relative; z-index: 1; }
@media (max-width: 780px){ .progress-panel { grid-template-columns: 1fr; padding: 28px; } }

.progress-intro .eyebrow { color: var(--cyan); }
.progress-intro h2 { color: oklch(0.98 0.005 240); font-family: var(--mono); font-weight: 700; }
.progress-intro p {
  color: oklch(0.78 0.01 240);
  margin-top: 12px;
  font-size: 0.95rem;
  line-height: 1.55;
}

.badges-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
@media (max-width: 640px) { .badges-grid { grid-template-columns: repeat(2,1fr); } }

.badge {
  padding: 16px 12px;
  border-radius: 10px;
  background: oklch(0.28 0.02 250);
  border: 1px solid oklch(0.38 0.02 250);
  text-align: center;
  transition: transform 0.15s;
  position: relative;
}
.badge.earned {
  background: var(--cyan);
  color: oklch(0.2 0.03 220);
  border-color: var(--cyan-deep);
}
.badge .icon {
  width: 28px; height: 28px;
  margin: 0 auto 8px;
  display: grid; place-items: center;
  color: var(--cyan);
}
.badge.earned .icon { color: oklch(0.2 0.03 220); }
.badge.locked { opacity: 0.5; }
.badge .name {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: inherit;
}
.badge .hint {
  font-family: var(--mono);
  font-size: 0.66rem;
  color: oklch(0.7 0.01 240);
  margin-top: 4px;
  line-height: 1.35;
}
.badge.earned .hint { color: oklch(0.3 0.04 220); }

/* CTA band */
.cta-band {
  padding: 56px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: var(--paper-2);
}
.cta-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 30px;
  flex-wrap: wrap;
}
.cta-inner h2 {
  font-family: var(--mono);
  font-weight: 700;
  letter-spacing: -0.025em;
}
.cta-inner p {
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.9rem;
  margin-top: 8px;
}

/* Footer */
.site-foot {
  padding: 32px 0 50px;
  color: var(--ink-3);
  font-size: 0.78rem;
  font-family: var(--mono);
  letter-spacing: 0.04em;
  display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap;
}
.site-foot .r { display: flex; gap: 18px; }