/* =============================================================================
   Pixel Academy — Revamp design system  (Ananya's approved mockup)
   Single blue accent (#3b82f6) guides focus; department colours are only
   small category dots; gradient is reserved for identity moments (logo mark,
   hero wash, Pixel Pass). Flat, hairline borders, no shadows, Inter, line icons.
   Light-first, with a proven dark palette under prefers-color-scheme: dark.
   Shared by index.html (Home/Catalog) and course-preview.html (Course detail).
   ========================================================================== */

/* ------------------------------------------------------------------ TOKENS */
:root{
  --bg:#f6f7f9; --surface:#ffffff; --surface-2:#fbfcfd;
  --ink:#0e1116; --body:#3b424d; --muted:#79808c;
  --hair:#e7e9ee; --soft:#f1f3f6; --soft-2:#eef1f5;
  --primary:#3b82f6; --primary-ink:#1d4ed8; --primary-tint:#eaf1fe;
  --d-design:#3b82f6; --d-marketing:#ec4899; --d-backend:#16a34a; --d-ai:#8b5cf6; --d-vedic:#e59409;
  --gold:#e59409; --gold-tint:#fdf3e2;
  --grad:linear-gradient(120deg,#3b82f6 0%,#8b5cf6 52%,#ec4899 100%);
  --grad-soft:linear-gradient(120deg,#eaf1fe 0%,#f0eafe 55%,#fde9f4 100%);
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0a0c10; --surface:#14171d; --surface-2:#12151b;
    --ink:#f0f2f6; --body:#b6bdc8; --muted:#7d8592;
    --hair:#242832; --soft:#191d24; --soft-2:#1c212a;
    --primary:#5b9bff; --primary-ink:#9dc1ff; --primary-tint:#14213a;
    --d-design:#5b9bff; --d-marketing:#f472b6; --d-backend:#34d399; --d-ai:#a78bfa; --d-vedic:#f0a828;
    --gold:#f0a828; --gold-tint:#2a1f0d;
    --grad-soft:linear-gradient(120deg,#12233f 0%,#1c1836 55%,#2a1226 100%);
  }
}

/* ------------------------------------------------------------------- RESET */
*{box-sizing:border-box}
html,body{margin:0;max-width:100%;overflow-x:hidden}
body{
  background:var(--bg); color:var(--ink);
  font:400 15px/1.55 "Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%}
a{color:inherit}
svg.ic{width:1em;height:1em;stroke:currentColor;stroke-width:1.9;fill:none;stroke-linecap:round;stroke-linejoin:round;flex:none;vertical-align:-.14em}
.tnum{font-variant-numeric:tabular-nums}
.muted{color:var(--muted)}
.eyebrow{font-size:11px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--primary)}
.hair{height:1px;background:var(--hair);border:0;margin:0}

/* --------------------------------------------------------------- PRIMITIVES */
.btn{display:inline-flex;align-items:center;gap:7px;font:inherit;font-weight:600;font-size:14px;border-radius:10px;
  padding:10px 16px;border:1px solid var(--hair);background:var(--surface);color:var(--ink);cursor:pointer;text-decoration:none;white-space:nowrap;transition:background .15s,border-color .15s,color .15s}
.btn:hover{border-color:var(--muted)}
.btn.pri{background:var(--primary);border-color:var(--primary);color:#fff}
.btn.pri:hover{background:var(--primary-ink);border-color:var(--primary-ink)}
.btn.grad{background:var(--grad);border:none;color:#fff}
.btn.grad:hover{filter:brightness(1.05)}
.btn.ghost{background:transparent}
.btn.sm{padding:7px 12px;font-size:13px;border-radius:8px}
.btn.block{width:100%;justify-content:center}
.lnk{color:var(--primary);font-weight:600;text-decoration:none;display:inline-flex;align-items:center;gap:5px}
.lnk:hover{text-decoration:underline}
.tag{display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:600;padding:3px 9px;border-radius:7px;
  border:1px solid var(--hair);color:var(--body);background:var(--surface)}
.dot{width:7px;height:7px;border-radius:50%;flex:none}
.price{font-weight:700;letter-spacing:-.02em}
.strike{color:var(--muted);text-decoration:line-through;font-weight:500}
.bar{height:6px;border-radius:20px;background:var(--soft-2);overflow:hidden}
.bar > i{display:block;height:100%;border-radius:20px;background:var(--primary)}

/* --------------------------------------------------------------------- NAV */
.nav{display:flex;align-items:center;gap:14px;padding:12px clamp(16px,4vw,30px);border-bottom:1px solid var(--hair);
  background:color-mix(in srgb,var(--surface) 88%,transparent);backdrop-filter:blur(10px);position:sticky;top:0;z-index:40;flex-wrap:wrap}
.nav .logo{display:flex;align-items:center;gap:9px;font-weight:700;letter-spacing:-.01em;color:var(--ink);text-decoration:none}
.nav .logo .m{width:28px;height:28px;border-radius:8px;background:var(--grad);display:grid;place-items:center;color:#fff}
.nav .logo .m svg{width:17px;height:17px}
.nav .links{display:flex;gap:4px;margin:0 auto}
.nav .links a{font-size:14px;color:var(--body);text-decoration:none;padding:7px 11px;border-radius:8px;font-weight:500;display:inline-flex;align-items:center;gap:5px}
.nav .links a:hover{background:var(--soft)}
.nav .links a.on{color:var(--ink);font-weight:600}
.nav .links a .ic{color:var(--muted);width:12px;height:12px}
@media(max-width:680px){.nav .links{display:none}}

/* ---------------------------------------------------------- PAGE CONTAINER */
.pa-shell{background:var(--surface);border-bottom:1px solid var(--hair)}
.pa-wrap{max-width:1180px;margin:0 auto}

/* -------------------------------------------------------------- HERO / HOME */
.hero{position:relative;padding:clamp(30px,5vw,52px) clamp(16px,4vw,30px) clamp(26px,4vw,40px);
  background:var(--grad-soft);border-bottom:1px solid var(--hair);overflow:hidden}
.hero-inner{max-width:1180px;margin:0 auto;position:relative}
.hero h1{font-size:clamp(26px,4.4vw,44px);line-height:1.05;letter-spacing:-.03em;margin:12px 0;max-width:16ch}
.hero h1 .g{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--body);max-width:54ch;font-size:15.5px;margin:0 0 22px}
.hero .cta{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:20px}
.hero .trust{display:flex;gap:20px;flex-wrap:wrap;font-size:13px;color:var(--body)}
.hero .trust b{color:var(--ink)}
.hero .peek{position:absolute;right:0;top:8px;width:256px}
@media(max-width:900px){.hero .peek{display:none}}
.peekcard{background:var(--surface);border:1px solid var(--hair);border-radius:13px;padding:14px}
.peekcard .row{display:flex;align-items:center;gap:10px;padding:8px 0}
.peekcard .ib{width:32px;height:32px;border-radius:8px;display:grid;place-items:center;flex:none}
.peek-arrow{display:flex;align-items:center;gap:8px;justify-content:center;color:var(--muted);font-size:11px;font-weight:600;padding:4px 0}

.strip{max-width:1180px;margin:0 auto;display:flex;gap:22px;flex-wrap:wrap;align-items:center;
  padding:14px clamp(16px,4vw,30px);font-size:12.5px;color:var(--muted)}
.strip b{color:var(--body);font-weight:600}
.strip .strip-hr{width:100%;max-width:1180px;margin:0 auto}

.catbar{max-width:1180px;margin:0 auto;display:flex;gap:8px;flex-wrap:wrap;padding:18px clamp(16px,4vw,30px) 4px}
.chip{display:inline-flex;align-items:center;gap:7px;font-size:13px;font-weight:600;color:var(--body);
  border:1px solid var(--hair);background:var(--surface);padding:8px 14px;border-radius:20px;cursor:pointer;transition:.15s}
.chip:hover{border-color:var(--muted)}
.chip.on{border-color:var(--primary);color:var(--primary-ink);background:var(--primary-tint)}

.grid{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));
  gap:15px;padding:16px clamp(16px,4vw,30px) 28px}

/* -------------------------------------------------------------- COURSE CARD */
.course{display:flex;flex-direction:column;gap:9px;padding:16px;border:1px solid var(--hair);border-radius:14px;
  background:var(--surface);text-decoration:none;color:var(--ink);transition:border-color .15s,transform .15s}
.course:hover{border-color:var(--primary);transform:translateY(-2px)}
.course .top{display:flex;align-items:center;justify-content:space-between}
.course .ic-b{width:36px;height:36px;border-radius:9px;display:grid;place-items:center;font-size:18px}
.course h3{font-size:15.5px;font-weight:700;letter-spacing:-.01em;margin:3px 0 0;line-height:1.25;color:var(--ink)}
.course .desc{font-size:13px;color:var(--muted);line-height:1.45;flex:1}
.course .meta{display:flex;gap:12px;font-size:12px;color:var(--muted);align-items:center}
.course .foot{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--hair);padding-top:12px;margin-top:2px}
.course .pr{display:flex;align-items:baseline;gap:7px}
.course .pr .price{font-size:18px;color:var(--ink)}
.course .build{font-size:12px;font-weight:600;color:var(--primary);display:inline-flex;align-items:center;gap:4px}
.course:hover .build{text-decoration:underline}

/* ------------------------------------------------------------- PIXEL PASS CTA */
.passband{max-width:1180px;margin:8px auto 40px;padding:0 clamp(16px,4vw,30px)}
.passband .inner{border:1px solid var(--hair);border-radius:16px;overflow:hidden;background:var(--surface);
  display:grid;grid-template-columns:1fr;gap:0}
@media(min-width:760px){.passband .inner{grid-template-columns:1.4fr .9fr}}
.passband .l{padding:24px}
.passband .l h3{font-size:20px;letter-spacing:-.02em;margin:8px 0 8px}
.passband .l p{color:var(--body);font-size:14px;margin:0 0 16px;max-width:46ch}
.passband .r{background:var(--grad);color:#fff;padding:24px;display:flex;flex-direction:column;justify-content:center;gap:6px}
.passband .r .k{font-size:10.5px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;opacity:.9}
.passband .r .pp{display:flex;align-items:baseline;gap:8px}
.passband .r .pp .price{font-size:34px;letter-spacing:-.03em}
.passband .r .btn{background:#fff;color:var(--primary-ink);border:none;margin-top:12px}

/* ------------------------------------------------------------------ FOOTER */
.footer{border-top:1px solid var(--hair);color:var(--muted);font-size:13px;background:var(--surface)}
.footer .fin{max-width:1180px;margin:0 auto;padding:24px clamp(16px,4vw,30px);display:flex;gap:14px;flex-wrap:wrap;align-items:center;justify-content:space-between}
.footer a{color:var(--body);text-decoration:none}
.footer a:hover{color:var(--ink)}
.footer .flinks{display:flex;gap:16px;flex-wrap:wrap}

/* =============================================================== COURSE DETAIL */
.crumb{max-width:1180px;margin:0 auto;font-size:12.5px;color:var(--muted);padding:16px clamp(16px,4vw,30px) 0;
  display:flex;gap:7px;align-items:center;flex-wrap:wrap}
.crumb a{color:var(--body);text-decoration:none}
.crumb a:hover{color:var(--ink)}
.detail{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:1fr;gap:22px;padding:16px clamp(16px,4vw,30px) 32px}
@media(min-width:820px){.detail{grid-template-columns:1fr 320px}}
.d-head h1{font-size:clamp(22px,3.2vw,30px);letter-spacing:-.02em;margin:10px 0 8px;line-height:1.12}
.course-hero-desc,.d-head .sub{color:var(--body);font-size:15px;max-width:62ch;margin:0 0 16px}
.d-meta,.course-meta-row{display:flex;gap:18px;flex-wrap:wrap;font-size:13px;color:var(--muted);margin-bottom:18px}
.d-meta b,.course-meta-item strong{color:var(--ink)}
.course-meta-item{display:inline-flex;align-items:center;gap:6px}
.course-dept-badge{display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:600;padding:4px 10px;border-radius:7px;
  border:1px solid var(--hair);color:var(--body);background:var(--surface)}

.preview{position:relative;border:1px solid var(--hair);border-radius:12px;overflow:hidden;background:var(--soft);
  aspect-ratio:16/8;display:grid;place-items:center;margin-bottom:20px}
.preview .thumb-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.9}
.preview .play{position:relative;z-index:2;width:56px;height:56px;border-radius:50%;background:var(--surface);border:1px solid var(--hair);display:grid;place-items:center;color:var(--primary)}
.preview .free{position:absolute;left:12px;top:12px;z-index:2}
.preview .cap{position:absolute;left:12px;bottom:12px;z-index:2;font-size:12px;color:#fff;font-weight:600;background:rgba(0,0,0,.45);padding:4px 9px;border-radius:7px;backdrop-filter:blur(4px)}

.sect-t{font-size:12px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);margin:26px 0 12px}
.section-label{font-size:12px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--primary);margin:26px 0 6px}
.section-title{font-size:17px;font-weight:700;letter-spacing:-.01em;margin:0 0 14px}

/* curriculum (script-generated .curriculum-item markup) */
.curriculum-list{display:grid;gap:9px}
.curriculum-item{display:flex;align-items:center;gap:12px;border:1px solid var(--hair);border-radius:11px;background:var(--surface);padding:13px 14px}
.curriculum-num{width:26px;height:26px;border-radius:7px;background:var(--soft);display:grid;place-items:center;font-size:12px;font-weight:700;color:var(--body);flex:none}
.curriculum-info{flex:1;min-width:0}
.curriculum-info h4{font-size:14px;font-weight:600;margin:0}
.curriculum-info p{font-size:12px;color:var(--muted);margin:3px 0 0}
.curriculum-tag{font-size:11px;font-weight:600;color:var(--muted);border:1px solid var(--hair);padding:3px 9px;border-radius:7px;white-space:nowrap}
.curriculum-tag.free{color:var(--primary-ink);border-color:var(--primary);background:var(--primary-tint)}

/* what you'll learn (script-generated .learn-item markup) */
.learn-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px}
.learn-item{display:flex;align-items:flex-start;gap:9px;font-size:13.5px;color:var(--body);border:1px solid var(--hair);border-radius:10px;background:var(--surface);padding:11px 13px}
.learn-check{color:var(--d-backend);font-weight:800;flex:none}

/* mentor */
.instructor-card,.mentor{display:flex;gap:14px;align-items:flex-start;padding:16px;border:1px solid var(--hair);border-radius:12px;background:var(--surface-2)}
.instructor-avatar,.mentor .av{width:48px;height:48px;border-radius:12px;background:var(--grad);color:#fff;display:grid;place-items:center;font-weight:700;flex:none}
.instructor-info h4,.mentor .mn2{font-size:15px;font-weight:700;margin:0 0 4px}
.instructor-info p,.mentor .mr{font-size:13px;color:var(--muted);margin:0;line-height:1.5}
.mentor-links{margin-top:8px}
.mentor-link{font-size:13px;color:var(--primary);font-weight:600;text-decoration:none}
.mentor-link:hover{text-decoration:underline}

/* ------------------------------------------------------------------ BUY RAIL */
.course-sidebar{position:relative}
.buy,.sidebar-card{border:1px solid var(--hair);border-radius:14px;background:var(--surface);padding:0;position:sticky;top:78px;overflow:hidden}
.sidebar-card-img{width:100%;height:150px;object-fit:cover;display:block;border-bottom:1px solid var(--hair)}
.sidebar-card-body,.buy-body{padding:18px}
.sidebar-price{display:flex;align-items:baseline;gap:10px;margin-bottom:8px}
.sidebar-price .price{font-size:28px;color:var(--ink)}
.sidebar-price .original{font-size:14px;color:var(--muted);text-decoration:line-through;font-weight:500}
.sidebar-price .discount{font-size:11px;font-weight:700;color:var(--d-backend);background:color-mix(in srgb,var(--d-backend) 12%,transparent);padding:3px 8px;border-radius:6px}
.buy-oneline{font-size:12px;color:var(--muted);margin:-2px 0 14px}
.cta-btn{display:inline-flex;width:100%;justify-content:center;align-items:center;gap:7px;font:inherit;font-weight:700;font-size:14.5px;
  border-radius:10px;padding:12px 16px;border:1px solid var(--primary);background:var(--primary);color:#fff;cursor:pointer;text-decoration:none;margin-bottom:10px;transition:.15s}
.cta-btn:hover{background:var(--primary-ink);border-color:var(--primary-ink)}
.cta-btn.secondary{background:transparent;color:var(--ink);border-color:var(--hair);font-weight:600}
.cta-btn.secondary:hover{background:var(--soft);border-color:var(--muted)}
.sidebar-features{list-style:none;margin:14px 0 0;padding:0;display:grid;gap:11px}
.sidebar-feature{display:flex;gap:9px;align-items:center;font-size:13px;color:var(--body)}
.sidebar-feature svg{width:16px;height:16px;stroke:var(--d-backend);color:var(--d-backend);flex:none}
.pass-nudge{font-size:12.5px;color:var(--muted);text-align:center;margin-top:14px;padding-top:14px;border-top:1px solid var(--hair)}
.pass-nudge b{color:var(--primary-ink)}
.pass-nudge a{color:var(--primary-ink);font-weight:700;text-decoration:none}
.pass-nudge a:hover{text-decoration:underline}

/* --------------------------------------------------- CROSS-PLATFORM PANEL */
.xpanel{border:1px solid var(--hair);border-radius:14px;overflow:hidden;background:var(--surface);margin-top:16px}
.xpanel .xh{display:flex;align-items:center;gap:10px;padding:13px 15px;background:var(--grad-soft);border-bottom:1px solid var(--hair)}
.xpanel .xh .xi{width:30px;height:30px;border-radius:8px;background:var(--surface);border:1px solid var(--hair);display:grid;place-items:center;color:var(--d-ai);flex:none}
.xpanel .xh b{font-size:13px;color:var(--ink)}
.xpanel .xh .xs{font-size:11.5px;color:var(--muted);display:block;font-weight:400}
.xpanel .xbody{padding:15px}
.xthumb{border-radius:11px;border:1px solid var(--hair);overflow:hidden;margin-bottom:12px;background:var(--soft)}
.xthumb .xtop{height:88px;background:var(--grad-soft);position:relative;border-bottom:1px solid var(--hair);display:grid;place-items:center;color:var(--body);font-weight:700;letter-spacing:-.01em;font-size:14px}
.xthumb .xtop .badge{position:absolute;right:10px;top:10px;font-size:10px;font-weight:700;background:var(--surface);border:1px solid var(--hair);padding:3px 8px;border-radius:6px;color:var(--body)}
.xthumb .xmeta{padding:10px 12px}
.xthumb .xmeta b{font-size:13px;color:var(--ink)}
.xthumb .xmeta span{font-size:11.5px;color:var(--muted);display:block}
.xdesc{font-size:12.5px;color:var(--muted);margin:0 0 12px}
.xnote{font-size:11.5px;color:var(--muted);margin-top:10px;display:flex;gap:6px;align-items:center}
.xnote .ic{color:var(--gold)}

/* ------------------------------------------------------- STICKY MOBILE BUY */
.mbuy{position:sticky;bottom:0;z-index:30;display:none;gap:10px;align-items:center;
  padding:12px clamp(16px,4vw,30px);border-top:1px solid var(--hair);background:var(--surface)}
.mbuy .price{font-size:20px}
.mbuy .strike{font-size:12px}
@media(max-width:819px){.mbuy{display:flex}}

/* --------------------------------------------------------------- UTILITIES */
.section{max-width:1180px;margin:0 auto;padding:0 clamp(16px,4vw,30px)}
.section.tight{padding-top:8px;padding-bottom:8px}