/* ═══════════════════════════════════════════════════════════════════════
   /university — ZenRows University. A learning hub: pick a track, its
   ordered lessons unfold, each a real guide or docs link. Directory
   language: hairline rows on transparent ground (never card fill),
   display-scale headings, a live lesson ticker in the hero, an
   interactive syllabus. Left-anchored like the rest of the site.
   ═══════════════════════════════════════════════════════════════════════ */
@import "../_ds/fonts.css";
@import "../_ds/theme.css";
@import "../_shared/chrome.css";
@import "../_shared/components.css";
@import "../_shared/audience-switcher.css";

.un-main { background: var(--background); }

/* reveal primitive (bidirectional handled by JS toggling is-in) */
[data-reveal] { opacity: 0; transform: translateY(14px); transition: opacity 620ms cubic-bezier(0.22,1,0.36,1), transform 620ms cubic-bezier(0.22,1,0.36,1); }
[data-reveal].is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { [data-reveal] { opacity: 1; transform: none; transition: none; } }

/* ── ACT 1 — hero + ticker ─────────────────────────────────── */
.un-hero {
  max-width: 1280px; margin-inline: auto;
  padding: clamp(120px, 16vh, 190px) clamp(20px, 5vw, 72px) clamp(64px, 9vh, 110px);
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(40px, 6vw, 96px);
  align-items: center;
}
.un-hero-h1 {
  font-family: var(--font-display); font-weight: 500;
  font-size: var(--mkt-hero-xl); line-height: 0.96; letter-spacing: -0.03em;
  color: var(--text-primary); margin: 0;
}
.un-hero-sub {
  font-family: var(--font-base); font-size: var(--mkt-body);
  line-height: 1.5; color: var(--text-secondary); margin: 22px 0 0; max-width: 44ch;
}
.un-hero-cta { margin-top: clamp(26px, 4vh, 40px); }
.un-hero-cta .link-cta { align-self: center; padding-top: 4px; }

.un-ticker {
  border: 1px solid var(--border-subtle); border-radius: 16px;
  padding: 20px 22px; overflow: hidden;
}
.un-ticker-head {
  display: flex; align-items: center; gap: 9px;
  font-family: var(--font-code); font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--text-tertiary); margin-bottom: 16px;
}
.un-ticker-dot {
  width: 7px; height: 7px; border-radius: 50%; background: #7ADAE6;
  box-shadow: 0 0 0 4px color-mix(in srgb, #7ADAE6 20%, transparent);
}
/* font-size on the list so the em height below tracks the title font (not the
   16px inherited base); tall enough for the longest title to wrap to two lines
   without clipping */
.un-ticker-list {
  list-style: none; margin: 0; padding: 0; position: relative;
  font-size: var(--mkt-h4); height: 2.55em;
}
.un-ticker-list li {
  font-family: var(--font-display); font-weight: 500;
  font-size: 1em; line-height: 1.18; letter-spacing: -0.02em;
  color: var(--text-primary);
  position: absolute; inset: 0;
  display: flex; align-items: center;
  opacity: 0; transform: translateY(10px);
  transition: opacity 520ms ease, transform 520ms cubic-bezier(0.22,1,0.36,1);
}
.un-ticker-list li.is-live { opacity: 1; transform: none; }

/* ── ACT 2 — syllabus ──────────────────────────────────────── */
.un-syllabus {
  max-width: 1120px; margin-inline: auto;
  padding: clamp(64px, 10vh, 120px) clamp(20px, 5vw, 72px);
}
.un-syllabus-head { max-width: 720px; margin-bottom: clamp(32px, 5vh, 52px); }
.un-syllabus-h2 {
  font-family: var(--font-display); font-weight: 500;
  font-size: var(--mkt-h2); line-height: 1.02; letter-spacing: -0.028em;
  color: var(--text-primary); margin: 0;
}
.un-syllabus-h2 em { font-style: normal; color: var(--text-primary); }
.un-syllabus-lead {
  font-family: var(--font-base); font-size: var(--mkt-body);
  line-height: 1.5; color: var(--text-secondary); margin: 16px 0 0; max-width: 52ch;
}
.un-tracks { margin-bottom: clamp(28px, 4vh, 40px); }

.un-panels { position: relative; }
.un-panel { display: none; }
.un-panel.is-on { display: block; }
.un-panel-note {
  font-family: var(--font-base); font-size: 15px; line-height: 1.5;
  color: var(--text-secondary); margin: 0 0 20px; max-width: 60ch;
}
.un-lesson {
  display: grid; grid-template-columns: 44px 1fr auto; align-items: center; gap: 18px;
  padding: 18px 6px; border-top: 1px solid var(--border-subtle);
  text-decoration: none; transition: padding-left 240ms cubic-bezier(0.22,1,0.36,1);
}
.un-lesson:last-of-type { border-bottom: 1px solid var(--border-subtle); }
.un-lesson:hover { padding-left: 14px; }
.un-lesson-n {
  font-family: var(--font-code); font-size: 13px; color: var(--text-quaternary);
  font-variant-numeric: tabular-nums;
}
.un-lesson-b { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.un-lesson-t {
  font-family: var(--font-display); font-weight: 500;
  font-size: clamp(18px, 1.9vw, 24px); line-height: 1.15; letter-spacing: -0.018em;
  color: var(--text-primary);
}
.un-lesson-src {
  font-family: var(--font-code); font-size: 11px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--text-quaternary);
}
.un-lesson-arw {
  font-family: var(--font-code); font-size: 16px; color: var(--text-tertiary);
  transition: transform 240ms ease, color 240ms ease;
}
.un-lesson:hover .un-lesson-arw { transform: translateX(4px); color: var(--text-primary); }
.un-panel-more.link-cta { margin-top: 22px; display: inline-flex; }

/* ── ACT 3 — by language ───────────────────────────────────── */
.un-langs {
  max-width: 1120px; margin-inline: auto;
  padding: clamp(64px, 10vh, 120px) clamp(20px, 5vw, 72px);
}
.un-langs-head { max-width: 640px; margin-bottom: clamp(32px, 5vh, 48px); }
.un-langs-h2 {
  font-family: var(--font-display); font-weight: 500;
  font-size: var(--mkt-h2); line-height: 1.04; letter-spacing: -0.026em;
  color: var(--text-primary); margin: 0;
}
.un-langs-h2 em { font-style: normal; color: var(--text-primary); }
.un-langs-lead {
  font-family: var(--font-base); font-size: var(--mkt-body);
  line-height: 1.5; color: var(--text-secondary); margin: 16px 0 0; max-width: 48ch;
}
.un-lang-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.un-lang {
  display: flex; align-items: center; gap: 14px;
  padding: 20px; border: 1px solid var(--border-subtle); border-radius: 14px;
  text-decoration: none; transition: border-color 220ms ease, transform 220ms ease;
}
.un-lang:hover { border-color: var(--border); transform: translateY(-2px); }
.un-lang-ico { width: 28px; height: 28px; flex: none; object-fit: contain; }
.un-lang-b { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.un-lang-t {
  font-family: var(--font-display); font-weight: 500; font-size: 22px;
  letter-spacing: -0.02em; color: var(--text-primary);
}
.un-lang-c { font-family: var(--font-code); font-size: 11.5px; color: var(--text-quaternary); }

/* ── ACT 4 — closer ────────────────────────────────────────── */
.un-closer {
  padding: clamp(96px, 15vh, 200px) clamp(20px, 5vw, 72px);
  text-align: center;
}
.un-closer-h2 {
  font-family: var(--font-display); font-weight: 500;
  font-size: var(--mkt-hero); line-height: 0.98; letter-spacing: -0.03em;
  color: var(--text-primary); margin: 0;
}
.un-closer-lead {
  font-family: var(--font-base); font-size: var(--mkt-body);
  line-height: 1.5; color: var(--text-secondary); margin: 18px auto 0; max-width: 46ch;
}
.un-closer-cta { margin-top: clamp(28px, 4vh, 44px); }

/* ── wide screens ──────────────────────────────────────────── */
@media (min-width: 1600px) {
  .un-hero { max-width: 1500px; }
  
  .un-syllabus, .un-langs { max-width: 1280px; }
}

/* ── responsive ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .un-hero { grid-template-columns: 1fr; gap: 40px; }
  .un-lang-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  /* track picker: one scrollable row, not a wrapped stadium blob */
  .un-tracks {
    display: flex; flex-wrap: nowrap; max-width: 100%;
    overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none;
  }
  .un-tracks::-webkit-scrollbar { display: none; }
  .un-tracks .seg-control-opt { flex: 0 0 auto; white-space: nowrap; }
  /* hero CTA stacks to a column: keep the secondary link left-aligned */
  .un-hero-cta .link-cta { align-self: flex-start; padding-top: 0; }
  .un-lesson { grid-template-columns: 34px 1fr auto; gap: 12px; padding: 15px 4px; }
}