/* ==========================================================================
   MELZAYAT ACADEMY — site.css
   Dark editorial theme. One accent. Generous air. No framework.
   ========================================================================== */

:root {
  --bg:        #08090b;
  --bg-soft:   #0d0f13;
  --surface:   #111419;
  --surface-2: #161a20;
  --line:      rgba(255,255,255,.085);
  --line-soft: rgba(255,255,255,.05);
  --text:      #eceae5;
  --text-dim:  #b4b8bf;
  --muted:     #868c96;
  --accent:    #e9b949;
  --accent-2:  #f4d68a;
  --accent-dim:rgba(233,185,73,.14);
  --red:       #ff6b6b;
  --red-bg:    rgba(255,107,107,.055);
  --red-line:  rgba(255,107,107,.26);
  --green:     #4ade9b;
  --green-bg:  rgba(74,222,155,.05);
  --green-line:rgba(74,222,155,.24);

  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "Fraunces", ui-serif, Georgia, "Times New Roman", serif;
  --arabic: "IBM Plex Sans Arabic", "Segoe UI", Tahoma, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --sidebar-w: 302px;
  --measure: 45rem;
  --radius: 14px;
  --ease: cubic-bezier(.22,.7,.3,1);
}

/* ------------------------------------------------------------------ reset */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.72;
  letter-spacing: -.011em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(900px 520px at 78% -8%, rgba(233,185,73,.075), transparent 62%),
    radial-gradient(760px 460px at 4% 4%, rgba(120,150,255,.045), transparent 60%);
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
::selection { background: rgba(233,185,73,.28); color: #fff; }

h1,h2,h3,h4 { font-family: var(--serif); font-weight: 600; letter-spacing: -.024em; line-height: 1.14; margin: 0; }

.wrap { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 28px; }

/* --------------------------------------------------------------- wordmark */
.wordmark { display: inline-flex; align-items: center; gap: 11px; }
.wordmark-mark {
  width: 32px; height: 32px; flex: 0 0 32px;
  display: grid; place-items: center;
  border: 1px solid rgba(233,185,73,.5);
  border-radius: 9px;
  font-family: var(--serif); font-weight: 700; font-size: 17px;
  color: var(--accent);
  background: linear-gradient(160deg, rgba(233,185,73,.16), transparent);
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}
.wordmark:hover .wordmark-mark { border-color: var(--accent); transform: translateY(-1px); }
.wordmark-text { display: flex; flex-direction: column; line-height: 1.05; }
.wordmark-text b { font-size: 13px; font-weight: 600; letter-spacing: .17em; }
.wordmark-text i {
  font-style: normal; font-size: 9.5px; letter-spacing: .32em; color: var(--muted);
}

/* ---------------------------------------------------------------- topbar */
.topbar {
  position: sticky; top: 0; z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(8,9,11,.72);
  border-bottom: 1px solid var(--line-soft);
}
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 74px; }
.topnav a {
  font-size: 13px; letter-spacing: .06em; color: var(--muted);
  text-transform: uppercase; transition: color .25s var(--ease);
}
.topnav a:hover { color: var(--accent); }

/* ------------------------------------------------------------------- hero */
.eyebrow {
  font-size: 11px; text-transform: uppercase; letter-spacing: .26em;
  color: var(--accent); margin: 0 0 22px; font-weight: 500;
}
.hero { padding: 108px 0 84px; }
.hero-title {
  font-size: clamp(2.9rem, 7.4vw, 5.4rem);
  line-height: .98; letter-spacing: -.038em; margin: 0 0 30px; max-width: 15ch;
}
.hero-title em { font-style: italic; color: var(--accent); }
.hero-lede {
  max-width: 40rem; font-size: 1.115rem; color: var(--text-dim); margin: 0 0 38px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 14px 26px; border-radius: 100px;
  font-size: 14.5px; font-weight: 500; letter-spacing: -.005em;
  border: 1px solid transparent;
  transition: transform .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease);
}
.btn-primary { background: var(--accent); color: #17130a; font-weight: 600; }
.btn-primary:hover { background: var(--accent-2); transform: translateY(-2px); }
.btn-ghost { border-color: var(--line); color: var(--text-dim); }
.btn-ghost:hover { border-color: rgba(233,185,73,.45); color: var(--text); transform: translateY(-2px); }
.hero-stats {
  list-style: none; display: flex; gap: 54px; padding: 0;
  margin: 74px 0 0; border-top: 1px solid var(--line-soft); padding-top: 26px;
}
.hero-stats li { display: flex; flex-direction: column; gap: 2px; }
.hero-stats b { font-family: var(--serif); font-size: 2rem; font-weight: 600; }
.hero-stats span { font-size: 11.5px; text-transform: uppercase; letter-spacing: .16em; color: var(--muted); }

/* ---------------------------------------------------------------- courses */
.courses { padding: 30px 0 110px; }
.section-head { margin-bottom: 40px; }
.section-title { font-size: clamp(1.7rem, 3vw, 2.3rem); letter-spacing: -.03em; }
.section-note { color: var(--muted); margin: 10px 0 0; max-width: 40rem; font-size: .97rem; }
.course-grid {
  display: grid; gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 400px), 1fr));
}
.course-card {
  position: relative; display: flex; flex-direction: column;
  padding: 28px 26px 26px;
  background: linear-gradient(180deg, var(--surface), rgba(17,20,25,.6));
  border: 1px solid var(--line); border-radius: var(--radius);
  transition: transform .35s var(--ease), border-color .35s var(--ease), background .35s var(--ease);
  overflow: hidden;
}
.course-card.is-live:hover { transform: translateY(-4px); border-color: rgba(233,185,73,.42); }
.course-card.is-live::after {
  content: ""; position: absolute; inset: 0 0 auto; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0; transition: opacity .35s var(--ease);
}
.course-card.is-live:hover::after { opacity: .85; }
.course-card.is-soon { opacity: .46; }
.course-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.course-num { font-family: var(--mono); font-size: 12px; color: var(--muted); letter-spacing: .1em; }
.pill {
  font-size: 10px; text-transform: uppercase; letter-spacing: .16em;
  padding: 5px 11px; border-radius: 100px; border: 1px solid var(--line);
}
.pill-live { color: var(--accent); border-color: rgba(233,185,73,.36); background: var(--accent-dim); }
.pill-soon { color: var(--muted); }
.course-title { font-size: 1.55rem; margin-bottom: 12px; }
.course-summary { color: var(--text-dim); font-size: .95rem; margin: 0 0 22px; flex: 1; }
.course-meta {
  display: flex; flex-wrap: wrap; gap: 8px 16px; padding-top: 18px;
  border-top: 1px solid var(--line-soft);
  font-size: 11.5px; text-transform: uppercase; letter-spacing: .12em; color: var(--muted);
}
.course-progress { margin-top: 16px; }
.course-progress small { display: block; margin-top: 7px; font-size: 11px; letter-spacing: .1em; color: var(--muted); text-transform: uppercase; }
.course-cta {
  margin-top: 20px; font-size: 14px; font-weight: 500; color: var(--accent);
  display: inline-flex; align-items: center; gap: 8px;
}
.course-cta em { font-style: normal; transition: transform .3s var(--ease); display: inline-block; }
.course-card:hover .course-cta em { transform: translateX(5px); }

.bar { height: 3px; border-radius: 100px; background: rgba(255,255,255,.085); overflow: hidden; }
.bar > span {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 100px; transition: width .55s var(--ease);
}

/* ---------------------------------------------------------------- footer */
.site-footer { border-top: 1px solid var(--line-soft); padding: 40px 0 56px; margin-top: auto; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 20px; justify-content: space-between; align-items: flex-end; }
.footer-mark { font-size: 12px; letter-spacing: .22em; color: var(--text-dim); }
.footer-note { color: var(--muted); font-size: 12.5px; margin: 8px 0 0; }

/* =========================================================== COURSE LAYOUT */
.page-course { display: flex; flex-direction: column; min-height: 100vh; }
.layout { display: grid; grid-template-columns: var(--sidebar-w) minmax(0, 1fr); align-items: start; }

.sidebar {
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
  border-right: 1px solid var(--line-soft);
  background: rgba(10,11,14,.6);
  scrollbar-width: thin; scrollbar-color: rgba(255,255,255,.14) transparent;
}
.sidebar::-webkit-scrollbar { width: 7px; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,.12); border-radius: 10px; }
.sidebar-inner { display: flex; flex-direction: column; min-height: 100%; padding: 26px 22px 26px 26px; }
.sidebar-head { padding-bottom: 20px; border-bottom: 1px solid var(--line-soft); }
.sidebar-course {
  margin: 16px 0 0; font-family: var(--serif); font-size: 1.16rem; letter-spacing: -.02em;
}

.progress { padding: 18px 0 20px; border-bottom: 1px solid var(--line-soft); }
.progress-row {
  display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 9px;
  font-size: 11px; text-transform: uppercase; letter-spacing: .14em; color: var(--muted);
}
.progress-row b { font-family: var(--mono); font-size: 12px; color: var(--accent); letter-spacing: .04em; }

.nav { padding: 22px 0 12px; flex: 1; }
.nav-part + .nav-part { margin-top: 26px; }
.nav-part-title {
  margin: 0 0 10px; font-size: 10.5px; text-transform: uppercase; letter-spacing: .17em;
  color: var(--muted); display: flex; gap: 8px; align-items: center;
}
.nav-part-title span { color: var(--accent); }
.nav-list { list-style: none; margin: 0; padding: 0; }
.nav-link {
  position: relative; display: grid; grid-template-columns: 22px 1fr 14px; gap: 10px;
  align-items: baseline;
  padding: 8px 10px 8px 8px; margin-left: -8px; border-radius: 9px;
  font-size: 13.6px; color: var(--text-dim); line-height: 1.42;
  transition: background .22s var(--ease), color .22s var(--ease);
}
.nav-link:hover { background: rgba(255,255,255,.045); color: var(--text); }
.nav-link.is-active { background: var(--accent-dim); color: var(--text); }
.nav-link.is-active::before {
  content: ""; position: absolute; left: -8px; top: 9px; bottom: 9px; width: 2px;
  background: var(--accent); border-radius: 2px;
}
.nav-num { font-family: var(--mono); font-size: 11px; color: var(--muted); }
.nav-link.is-active .nav-num { color: var(--accent); }
.nav-num-alt { font-size: 7px; }
.nav-tick { font-size: 11px; color: var(--green); opacity: 0; transition: opacity .25s var(--ease); }
.nav-link.is-done .nav-tick { opacity: 1; }
.nav-link.is-done .nav-text { color: var(--muted); }

.sidebar-foot {
  padding-top: 18px; border-top: 1px solid var(--line-soft);
  display: flex; justify-content: space-between; align-items: center; gap: 10px;
  font-size: 11.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted);
}
.reset-btn {
  background: none; border: 0; padding: 0; cursor: pointer; color: inherit;
  font: inherit; letter-spacing: inherit; text-transform: inherit;
  transition: color .25s var(--ease);
}
.reset-btn:hover { color: var(--red); }
.sidebar-back:hover { color: var(--accent); }

/* -------------------------------------------------------------- mobile bar */
.mobilebar { display: none; }
.drawer-scrim {
  position: fixed; inset: 0; z-index: 45; background: rgba(0,0,0,.55);
  backdrop-filter: blur(2px); opacity: 0; transition: opacity .3s var(--ease);
}
.drawer-scrim.is-open { opacity: 1; }

/* ------------------------------------------------------------------ content */
.content { padding: 66px 56px 90px; min-width: 0; }
.module { max-width: var(--measure); margin: 0 auto; }
.module-head { padding-bottom: 34px; border-bottom: 1px solid var(--line-soft); margin-bottom: 44px; }
.module-title-row { display: flex; gap: 20px; align-items: flex-start; }
.module-num {
  font-family: var(--serif); font-size: 2.6rem; line-height: 1; color: rgba(233,185,73,.32);
  font-weight: 600; letter-spacing: -.04em;
}
.module-title { font-size: clamp(2rem, 4.4vw, 3.05rem); letter-spacing: -.033em; }
.module-meta {
  margin: 20px 0 0; font-size: 11.5px; text-transform: uppercase;
  letter-spacing: .15em; color: var(--muted);
}
.course-hero-title { font-size: clamp(2.4rem, 5.6vw, 3.9rem); }
.course-hero-lede { color: var(--text-dim); font-size: 1.08rem; margin: 22px 0 26px; max-width: 38rem; }
.chips { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: 30px; }
.chip {
  font-size: 11px; letter-spacing: .13em; text-transform: uppercase; color: var(--text-dim);
  border: 1px solid var(--line); border-radius: 100px; padding: 6px 13px;
}

/* ------------------------------------------------------------ typography */
.module-body, .prose { font-size: 1.045rem; }
.sec + .sec, .sec + .exercise, .exercise + .sec { margin-top: 52px; }
.sec-title {
  display: flex; align-items: center; gap: 14px;
  font-size: .82rem; font-family: var(--sans); font-weight: 600;
  text-transform: uppercase; letter-spacing: .2em; color: var(--accent);
  margin: 0 0 22px;
}
.sec-rule { flex: 0 0 26px; height: 1px; background: rgba(233,185,73,.45); }
.sec-head {
  font-family: var(--serif); font-size: 1.42rem; letter-spacing: -.026em;
  margin: 0 0 .75em; color: var(--text);
}
.course-byline {
  font-family: var(--serif); font-style: italic; font-size: 1.02rem;
  color: var(--muted); margin: -12px 0 26px; max-width: 38rem;
}

.module-body p, .prose p { margin: 0 0 1.24em; color: var(--text-dim); }
.module-body p strong, .prose p strong { color: var(--text); font-weight: 600; }
.module-body h3, .prose h3 { font-size: 1.32rem; margin: 2.1em 0 .7em; letter-spacing: -.024em; }
.module-body h4, .prose h4 { font-size: 1.1rem; margin: 1.9em 0 .6em; }
.module-body ul, .module-body ol, .prose ul, .prose ol { margin: 0 0 1.3em; padding-left: 1.25em; color: var(--text-dim); }
.module-body li, .prose li { margin-bottom: .62em; padding-left: .2em; }
.module-body li::marker, .prose li::marker { color: var(--accent); font-size: .9em; }
.module-body li strong, .prose li strong { color: var(--text); }
.module-body a, .prose a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }

.note {
  font-size: .92rem; color: var(--muted); font-style: italic;
  border-left: 2px solid var(--line); padding-left: 14px; margin: -.4em 0 1.4em !important;
}
.rule { border: 0; border-top: 1px solid var(--line-soft); margin: 2.6em 0; }

blockquote {
  margin: 1.8em 0; padding: 4px 0 4px 26px;
  border-left: 2px solid var(--accent);
  font-family: var(--serif); font-size: 1.16rem; font-style: italic;
  color: var(--text); line-height: 1.55;
}
blockquote p:last-child { margin-bottom: 0; }

code {
  font-family: var(--mono); font-size: .86em;
  background: rgba(255,255,255,.06); border: 1px solid var(--line-soft);
  padding: .12em .4em; border-radius: 5px; color: var(--accent-2);
  word-break: break-word;
}
pre {
  margin: 1.5em 0; padding: 20px 22px; overflow-x: auto;
  background: #0b0d11; border: 1px solid var(--line); border-radius: 12px;
  scrollbar-width: thin; scrollbar-color: rgba(255,255,255,.14) transparent;
}
pre::-webkit-scrollbar { height: 8px; }
pre::-webkit-scrollbar-thumb { background: rgba(255,255,255,.13); border-radius: 10px; }
pre code {
  background: none; border: 0; padding: 0; color: #d7dae0;
  font-size: 13.2px; line-height: 1.68; white-space: pre; display: block;
}
pre.rtl code, pre[dir="rtl"] code { white-space: pre-wrap; }

.table-wrap { overflow-x: auto; margin: 1.7em 0; border: 1px solid var(--line); border-radius: 12px; }
table { border-collapse: collapse; width: 100%; font-size: .93rem; }
th, td { text-align: left; padding: 13px 18px; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
th {
  font-size: 10.5px; text-transform: uppercase; letter-spacing: .14em;
  color: var(--accent); font-weight: 600; background: rgba(255,255,255,.022);
}
td { color: var(--text-dim); }
tr:last-child td { border-bottom: 0; }

/* ------------------------------------------------------------------- RTL */
.rtl, [dir="rtl"] {
  font-family: var(--arabic);
  direction: rtl; text-align: right;
  line-height: 1.95; letter-spacing: 0;
}
ul.rtl, ol.rtl { padding-left: 0; padding-right: 1.3em; }
blockquote.rtl, blockquote[dir="rtl"] { border-left: 0; border-right: 2px solid var(--accent); padding: 4px 26px 4px 0; }
.note.rtl { border-left: 0; border-right: 2px solid var(--line); padding-left: 0; padding-right: 14px; }
pre.rtl code { font-family: var(--arabic); font-size: 14px; line-height: 2; text-align: right; }

/* ------------------------------------------------------ BEFORE / AFTER cards */
.ba { display: grid; gap: 18px; margin: 2em 0 2.2em; grid-template-columns: 1fr 1fr; align-items: start; }
.ba-card {
  min-width: 0; border-radius: var(--radius); border: 1px solid var(--line);
  padding: 18px 20px 6px; background: var(--surface);
}
.ba-before { background: var(--red-bg); border-color: var(--red-line); }
.ba-after  { background: var(--green-bg); border-color: var(--green-line); }
.ba-tag {
  display: flex; align-items: center; gap: 9px; flex-wrap: wrap;
  font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .19em;
  margin-bottom: 14px; padding-bottom: 12px; border-bottom: 1px solid var(--line-soft);
}
.ba-before .ba-tag { color: var(--red); }
.ba-after .ba-tag { color: var(--green); }
.ba-mark {
  width: 19px; height: 19px; flex: 0 0 19px; display: grid; place-items: center;
  border-radius: 50%; font-size: 10px; letter-spacing: 0;
  border: 1px solid currentColor;
}
.ba-note { color: var(--muted); letter-spacing: .06em; text-transform: none; font-weight: 400; font-size: 11.5px; }
.ba-body > *:first-child { margin-top: 0; }
.ba-body pre { margin: 0 0 1.1em; background: rgba(0,0,0,.34); padding: 16px 17px; }
/* prompts are prose-in-code: wrap rather than clip, so nothing is hidden */
.ba-body pre code { font-size: 12.3px; line-height: 1.72; white-space: pre-wrap; }
.ba-body p { font-size: .95rem; }

/* let the comparison break out of the reading measure on wide screens,
   so both prompts stay legible side by side */
@media (min-width: 1180px) {
  .ba {
    --ba-w: clamp(45rem, calc(100vw - var(--sidebar-w) - 130px), 66rem);
    width: var(--ba-w);
    margin-inline: calc(50% - var(--ba-w) / 2);
  }
}
.ba-body .note { border-left-color: rgba(255,255,255,.13); }

/* -------------------------------------------------------------- exercise */
.exercise {
  margin: 2.6em 0; padding: 26px 28px 8px;
  background: linear-gradient(180deg, rgba(233,185,73,.075), rgba(233,185,73,.028));
  border: 1px solid rgba(233,185,73,.24); border-left: 3px solid var(--accent);
  border-radius: 6px var(--radius) var(--radius) 6px;
}
.exercise-head { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.exercise-icon { font-size: 19px; line-height: 1; }
.exercise-kicker {
  font-size: 10.5px; text-transform: uppercase; letter-spacing: .2em; color: var(--accent);
  border: 1px solid rgba(233,185,73,.3); padding: 4px 10px; border-radius: 100px;
}
.exercise-head h3 { font-size: 1.3rem; margin: 0; }
.exercise-body p { color: var(--text); }
.exercise-body > *:last-child { margin-bottom: 1em; }

/* ----------------------------------------------------------------- TOC */
.toc { margin-top: 64px; padding-top: 44px; border-top: 1px solid var(--line-soft); }
.toc-heading { margin-bottom: 30px; }
.toc-part + .toc-part { margin-top: 34px; }
.toc-part-title {
  font-size: 10.5px; text-transform: uppercase; letter-spacing: .18em; color: var(--muted);
  margin: 0 0 12px;
}
.toc-part-title span { color: var(--accent); }
.toc-list { list-style: none; margin: 0; padding: 0; }
.toc-list a {
  display: grid; grid-template-columns: 34px 1fr auto; gap: 14px; align-items: baseline;
  padding: 13px 14px; margin: 0 -14px; border-radius: 10px;
  border-bottom: 1px solid var(--line-soft);
  transition: background .25s var(--ease);
}
.toc-list a:hover { background: rgba(255,255,255,.04); }
.toc-num { font-family: var(--mono); font-size: 12px; color: var(--accent); }
.toc-title { font-size: .98rem; }
.toc-time { font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
li.is-done .toc-title { color: var(--muted); }
li.is-done .toc-num::after { content: " ✓"; color: var(--green); }

/* ------------------------------------------------------------- complete */
.complete { margin: 56px 0 0; }
.complete-box {
  display: flex; align-items: center; gap: 15px; cursor: pointer;
  padding: 17px 22px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); transition: border-color .3s var(--ease), background .3s var(--ease);
}
.complete-box:hover { border-color: rgba(233,185,73,.4); }
.complete-box input { position: absolute; opacity: 0; width: 0; height: 0; }
.complete-ui {
  width: 22px; height: 22px; flex: 0 0 22px; border-radius: 7px;
  border: 1.5px solid var(--line); display: grid; place-items: center;
  transition: all .25s var(--ease);
}
.complete-ui::after {
  content: "✓"; font-size: 13px; color: #12170f; opacity: 0; transform: scale(.5);
  transition: all .25s var(--ease);
}
.complete-box input:checked ~ .complete-ui { background: var(--green); border-color: var(--green); }
.complete-box input:checked ~ .complete-ui::after { opacity: 1; transform: scale(1); }
.complete-box input:focus-visible ~ .complete-ui { outline: 2px solid var(--accent); outline-offset: 3px; }
.complete-text { display: flex; flex-direction: column; line-height: 1.35; }
.complete-text b { font-size: 15px; font-weight: 500; }
.complete-text small { font-size: 11.5px; color: var(--muted); letter-spacing: .04em; }
.complete-box input:checked ~ .complete-text b { color: var(--green); }

/* ------------------------------------------------------------- prev / next */
.prevnext {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  margin-top: 26px; padding-top: 26px; border-top: 1px solid var(--line-soft);
}
.pn-slot {
  display: flex; flex-direction: column; gap: 5px; min-height: 1px;
  padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--radius);
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}
a.pn-slot:hover { transform: translateY(-2px); border-color: rgba(233,185,73,.4); }
span.pn-slot { border-color: transparent; }
.pn-next { text-align: right; }
.pn-dir { font-size: 10.5px; text-transform: uppercase; letter-spacing: .17em; color: var(--accent); }
.pn-label { font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.pn-title { font-family: var(--serif); font-size: 1.02rem; letter-spacing: -.02em; }

/* ------------------------------------------------------------ responsive */
@media (max-width: 1080px) { :root { --sidebar-w: 268px; } .content { padding: 56px 36px 80px; } }

@media (max-width: 900px) {
  body { font-size: 16.5px; }
  .layout { grid-template-columns: 1fr; }
  .mobilebar {
    /* must sit ABOVE the drawer so its close (X) button stays tappable */
    position: sticky; top: 0; z-index: 52; display: flex; align-items: center; gap: 14px;
    height: 60px; padding: 0 18px;
    background: rgba(8,9,11,.86); backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line-soft);
  }
  .mobilebar-label { flex: 1; font-size: 12px; letter-spacing: .16em; text-transform: uppercase; color: var(--text-dim); }
  .mobilebar-home { font-size: 11px; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); }
  .drawer-btn {
    width: 34px; height: 34px; display: grid; align-content: center; gap: 5px;
    background: none; border: 0; padding: 0 4px; cursor: pointer;
  }
  .drawer-btn span { display: block; height: 1.5px; background: var(--text); border-radius: 2px; transition: transform .3s var(--ease), opacity .3s var(--ease); }
  .drawer-btn[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
  .drawer-btn[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .drawer-btn[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }
  .sidebar {
    position: fixed; top: 60px; left: 0; z-index: 50;
    width: min(84vw, 330px); height: calc(100dvh - 60px);
    background: var(--bg-soft); border-right: 1px solid var(--line);
    transform: translateX(-102%); transition: transform .34s var(--ease);
    box-shadow: 30px 0 60px rgba(0,0,0,.45);
  }
  .drawer-scrim { top: 60px; }
  .sidebar.is-open { transform: translateX(0); }
  .content { padding: 42px 22px 72px; }
  .ba { grid-template-columns: 1fr; }
  .hero { padding: 72px 0 60px; }
  .hero-stats { gap: 34px; }
  .wrap { padding: 0 20px; }
  .module-title-row { gap: 14px; }
  .module-num { font-size: 1.8rem; }
}

@media (max-width: 560px) {
  .prevnext { grid-template-columns: 1fr; }
  .pn-next { text-align: left; }
  span.pn-slot { display: none; }
  .exercise { padding: 22px 20px 6px; }
  .course-meta { gap: 6px 12px; }
  .hero-stats { flex-wrap: wrap; row-gap: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: .01ms !important; animation-duration: .01ms !important; }
  html { scroll-behavior: auto; }
}