/* Techshilpo CodeX — student-side design (2026-11-04). Admin panel has its own styles. */
:root{
  --ink:#10162f;--ink2:#3a4364;--muted:#667092;--bg:#f6f7fd;--card:#fff;--line:#e6e9f5;
  --brand:#5b4ef0;--brand2:#7c3aed;--cyan:#06b6d4;--pink:#ec4899;--ok:#059669;--warn:#d97706;--err:#dc2626;
  --grad:linear-gradient(120deg,#5b4ef0 0%,#7c3aed 45%,#06b6d4 100%);
  --dark:#0f1230;--r:18px;--max:1180px;
  --sh:0 1px 2px rgba(16,22,47,.05),0 10px 26px -14px rgba(16,22,47,.18);
  --sh2:0 2px 4px rgba(16,22,47,.06),0 26px 48px -20px rgba(91,78,240,.34);
  --ease:cubic-bezier(.2,.8,.2,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--ink);font:400 16px/1.7 'Hind Siliguri','Inter',system-ui,sans-serif;-webkit-font-smoothing:antialiased;overflow-x:hidden;-webkit-tap-highlight-color:transparent}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
.wrap{max-width:var(--max);margin:0 auto;padding:0 18px}
.en{font-family:'Inter',system-ui,sans-serif}
h1,h2,h3{line-height:1.3;font-weight:700}
:focus-visible{outline:3px solid rgba(91,78,240,.45);outline-offset:2px;border-radius:6px}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 22px;border-radius:12px;font-weight:600;font-size:15.5px;line-height:1.3;transition:transform .25s var(--ease),box-shadow .25s,background .2s,color .2s;white-space:nowrap}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0) scale(.98)}
.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}
.btn-main{background:var(--grad);background-size:160% 100%;color:#fff;box-shadow:0 12px 26px -10px rgba(91,78,240,.65);transition:transform .25s var(--ease),box-shadow .25s,background-position .5s}
.btn-main:hover{background-position:100% 0;box-shadow:0 18px 32px -10px rgba(91,78,240,.7)}
.btn-line{background:#fff;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--line)}
.btn-line:hover{box-shadow:inset 0 0 0 1.5px var(--brand);color:var(--brand)}
.btn-ok{background:#e7f8f1;color:var(--ok)}
.btn-lg{padding:14px 28px;font-size:16.5px;border-radius:14px}
.btn-sm{padding:7px 14px;font-size:14px;border-radius:10px}

/* top navigation */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;gap:14px;height:66px}
.logo{display:flex;align-items:center;gap:10px;font-family:'Inter',sans-serif;font-weight:800;font-size:18.5px;letter-spacing:-.4px}
.logo i{width:36px;height:36px;border-radius:11px;background:var(--grad);display:grid;place-items:center;color:#fff;font-style:normal;font-size:15px;font-weight:800;box-shadow:0 8px 16px -8px rgba(91,78,240,.8)}
.logo span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav-links{display:flex;gap:4px;margin-left:18px;list-style:none}
.nav-links a{display:block;padding:7px 13px;border-radius:9px;font-weight:500;color:var(--ink2);transition:background .2s,color .2s}
.nav-links a:hover,.nav-links a.on{background:#f0eeff;color:var(--brand)}
.nav .sp{flex:1}
.nav-right{display:flex;align-items:center;gap:8px}
.me{display:flex;align-items:center;gap:8px;padding:4px 12px 4px 4px;border-radius:12px;background:#f3f4fb;font-weight:600;font-size:14.5px;max-width:190px}
.me b{flex:none;width:30px;height:30px;border-radius:9px;background:var(--grad);color:#fff;display:grid;place-items:center;font-size:13px}
.me span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.menu-btn{display:none;width:40px;height:40px;border-radius:10px;background:#f3f4fb;align-items:center;justify-content:center;font-size:19px}

/* hero */
.hero{position:relative;overflow:hidden;background:#0f1230;color:#fff;isolation:isolate}
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:44px;align-items:center;padding-top:clamp(44px,7vw,84px);padding-bottom:clamp(50px,8vw,96px)}
.aurora{position:absolute;inset:-20%;z-index:-1;pointer-events:none}
.aurora i{position:absolute;border-radius:50%;filter:blur(70px);opacity:.55;animation:drift 18s ease-in-out infinite alternate;will-change:transform}
.aurora i:nth-child(1){width:46%;height:60%;left:2%;top:6%;background:#5b4ef0}
.aurora i:nth-child(2){width:38%;height:52%;right:6%;top:0;background:#06b6d4;animation-duration:22s;animation-delay:-6s}
.aurora i:nth-child(3){width:34%;height:44%;left:38%;bottom:0;background:#c026d3;opacity:.38;animation-duration:26s;animation-delay:-12s}
@keyframes drift{to{transform:translate(9%,8%) scale(1.15)}}
.pill{display:inline-flex;align-items:center;gap:8px;padding:5px 14px;border-radius:99px;font-weight:600;font-size:14px;background:rgba(255,255,255,.12);box-shadow:inset 0 0 0 1px rgba(255,255,255,.2)}
.pill u{width:8px;height:8px;border-radius:50%;background:#34d399;animation:pulse 2s infinite;text-decoration:none}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(52,211,153,.6)}80%,100%{box-shadow:0 0 0 9px rgba(52,211,153,0)}}
.hero h1{font-size:clamp(31px,5.2vw,54px);line-height:1.2;margin:16px 0 14px;letter-spacing:-.3px}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,#67e8f9,#a78bfa,#f9a8d4,#67e8f9);background-size:300% 100%;-webkit-background-clip:text;background-clip:text;color:transparent;animation:shine 8s linear infinite}
@keyframes shine{to{background-position:300% 0}}
.hero p.sub{font-size:clamp(16px,2vw,18.5px);color:#cdd2ea;max-width:36em}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.hero .btn-line{background:rgba(255,255,255,.1);color:#fff;box-shadow:inset 0 0 0 1.5px rgba(255,255,255,.3)}
.hero .btn-line:hover{background:#fff;color:var(--ink)}
.stats{display:flex;flex-wrap:wrap;gap:12px 34px;margin-top:30px}
.stats b{display:block;font-size:clamp(25px,3.4vw,33px);line-height:1.2;font-weight:700}
.stats span{color:#aeb4d4;font-size:14.5px}

/* floating lesson card in the hero */
.demo{position:relative;animation:float 7s ease-in-out infinite}
@keyframes float{50%{transform:translateY(-12px)}}
.demo-card{background:rgba(255,255,255,.97);color:var(--ink);border-radius:22px;padding:20px;box-shadow:0 40px 80px -30px rgba(0,0,0,.7)}
.demo-card h3{font-size:17px;margin-bottom:12px}
.demo-row{display:flex;align-items:center;gap:11px;padding:9px 0;border-top:1px solid var(--line);font-size:15px;font-weight:500;opacity:0;animation:rowIn .6s var(--ease) forwards}
.demo-row:nth-of-type(1){animation-delay:.3s}.demo-row:nth-of-type(2){animation-delay:.6s}.demo-row:nth-of-type(3){animation-delay:.9s}.demo-row:nth-of-type(4){animation-delay:1.2s}
@keyframes rowIn{from{opacity:0;transform:translateX(14px)}to{opacity:1;transform:none}}
.demo-row b{flex:none;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;font-size:12px;background:#e7f8f1;color:var(--ok)}
.demo-row.next b{background:#f0eeff;color:var(--brand)}
.demo-bar{height:8px;border-radius:9px;background:#eef0f8;overflow:hidden;margin-top:12px}
.demo-bar i{display:block;height:100%;width:68%;background:var(--grad);border-radius:9px;transform-origin:left;animation:grow 1.6s .4s var(--ease) both}
@keyframes grow{from{transform:scaleX(0)}}
.chip-fl{position:absolute;display:flex;align-items:center;gap:8px;padding:9px 14px;border-radius:14px;background:#fff;color:var(--ink);font-weight:600;font-size:14px;box-shadow:0 18px 34px -14px rgba(0,0,0,.55);animation:float 6s ease-in-out infinite}
.chip-fl.a{top:-16px;right:-8px}.chip-fl.b{bottom:-18px;left:-12px;animation-delay:-3s}

/* sections */
.sec{padding:clamp(44px,7vw,78px) 0}
.sec.alt{background:#fff;border-block:1px solid var(--line)}
.sec-head{text-align:center;max-width:680px;margin:0 auto 30px}
.tag{display:inline-block;color:var(--brand);background:#f0eeff;font-weight:600;font-size:14px;padding:3px 13px;border-radius:99px;margin-bottom:8px}
.sec-head h2{font-size:clamp(24px,3.6vw,35px)}
.sec-head p{color:var(--muted);margin-top:6px}

/* feature spotlight */
.spot{position:relative;overflow:hidden;border-radius:24px;color:#fff;background:var(--grad);padding:clamp(24px,4vw,44px);display:grid;grid-template-columns:1.3fr 1fr;gap:26px;align-items:center;box-shadow:var(--sh2)}
.spot h2{font-size:clamp(23px,3.4vw,33px)}
.spot p{opacity:.94;margin:8px 0 18px}
.spot .btn{background:#fff;color:var(--brand)}
.spot ol{list-style:none;display:grid;gap:7px}
.spot li{display:flex;gap:10px;align-items:center;font-weight:500;background:rgba(255,255,255,.14);padding:7px 12px;border-radius:11px;font-size:14.5px}
.spot li b{flex:none;width:24px;height:24px;border-radius:7px;background:#fff;color:var(--brand);display:grid;place-items:center;font-size:13px}

/* filters + search */
.tools{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;margin-bottom:20px}
.tabs{display:flex;gap:7px;overflow-x:auto;scrollbar-width:none;padding:2px}
.tabs::-webkit-scrollbar{display:none}
.tab{flex:none;padding:6px 15px;border-radius:99px;font-weight:600;font-size:14.5px;background:#fff;box-shadow:inset 0 0 0 1px var(--line);color:var(--ink2);transition:.2s}
.tab:hover{color:var(--brand)}
.tab.on{background:var(--ink);color:#fff;box-shadow:none}
.search{flex:1 1 240px;max-width:340px;padding:10px 16px;border-radius:12px;border:1px solid var(--line);background:#fff;font:inherit;font-size:15px;color:var(--ink)}
.search:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(91,78,240,.14)}

/* course cards */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:20px}
.cc{display:flex;flex-direction:column;background:var(--card);border-radius:var(--r);box-shadow:var(--sh);overflow:hidden;transition:transform .35s var(--ease),box-shadow .35s}
.cc:hover{transform:translateY(-6px);box-shadow:var(--sh2)}
.cc-top{position:relative;height:124px;display:grid;place-items:center;font-size:52px;overflow:hidden;background:linear-gradient(135deg,var(--c1),var(--c2))}
.cc-top::after{content:'';position:absolute;width:150px;height:150px;border-radius:50%;background:rgba(255,255,255,.16);right:-44px;top:-56px;transition:transform .6s var(--ease)}
.cc:hover .cc-top::after{transform:scale(1.5)}
.cc-top span{position:relative;z-index:1;transition:transform .45s var(--ease)}
.cc:hover .cc-top span{transform:scale(1.14) rotate(-5deg)}
.cc-top .cc-new{position:absolute;z-index:1;top:11px;left:11px;background:#fff;color:var(--brand);font-weight:700;font-size:12.5px;padding:2px 10px;border-radius:99px}
.cc-free{position:absolute;z-index:1;top:11px;right:11px;background:rgba(15,18,48,.72);color:#fff;font-weight:600;font-size:12.5px;padding:2px 10px;border-radius:99px}
.cc-b{padding:16px 18px 18px;display:flex;flex-direction:column;gap:7px;flex:1}
.cc-b .cat{color:var(--brand);font-weight:600;font-size:13.5px}
.cc-b h3{font-size:17.5px}
.cc-b p{color:var(--muted);font-size:14.5px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.cc-m{display:flex;flex-wrap:wrap;gap:6px 14px;margin-top:auto;padding-top:9px;color:var(--ink2);font-size:13.5px;font-weight:500}
.cc-go{color:var(--brand);font-weight:600;font-size:14.5px;display:flex;align-items:center;gap:6px;border-top:1px solid var(--line);margin-top:7px;padding-top:10px}
.cc-go i{font-style:normal;transition:transform .3s var(--ease)}
.cc:hover .cc-go i{transform:translateX(5px)}
.t1{--c1:#6366f1;--c2:#06b6d4}.t2{--c1:#f59e0b;--c2:#ef4444}.t3{--c1:#10b981;--c2:#0891b2}.t4{--c1:#8b5cf6;--c2:#ec4899}
.t5{--c1:#3b82f6;--c2:#6366f1}.t6{--c1:#14b8a6;--c2:#22c55e}.t7{--c1:#f43f5e;--c2:#a855f7}.t8{--c1:#0ea5e9;--c2:#2563eb}

/* why + steps */
.why{display:grid;grid-template-columns:repeat(auto-fit,minmax(235px,1fr));gap:16px}
.why div{background:var(--bg);border-radius:16px;padding:20px}
.why b{display:grid;place-items:center;width:44px;height:44px;border-radius:13px;background:var(--grad);color:#fff;font-size:20px;margin-bottom:10px;transition:transform .4s var(--ease)}
.why div:hover b{transform:rotate(-8deg) scale(1.1)}
.why h3{font-size:17px;margin-bottom:3px}
.why p{color:var(--muted);font-size:14.5px}

/* page header for inner pages */
.ph{position:relative;overflow:hidden;background:#0f1230;color:#fff;isolation:isolate;padding:clamp(28px,5vw,52px) 0}
.crumbs{display:flex;flex-wrap:wrap;gap:5px;font-size:14px;color:#b6bcdb;margin-bottom:9px}
.crumbs a:hover{color:#fff;text-decoration:underline}
.ph h1{font-size:clamp(25px,4vw,40px)}
.ph p{color:#cdd2ea;margin-top:7px;max-width:44em}
.meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:15px}
.meta span{padding:3px 13px;border-radius:99px;background:rgba(255,255,255,.13);font-weight:500;font-size:14px}
.ph .acts{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.ph .btn-line{background:rgba(255,255,255,.1);color:#fff;box-shadow:inset 0 0 0 1.5px rgba(255,255,255,.3)}
.ph .btn-ok{background:rgba(52,211,153,.2);color:#6ee7b7}

/* course page */
.cols{display:grid;grid-template-columns:1fr 310px;gap:26px;align-items:start}
.side{position:sticky;top:84px;display:grid;gap:14px}
.box{background:#fff;border-radius:var(--r);box-shadow:var(--sh);padding:20px}
.box h3{font-size:17px;margin-bottom:8px}
.box li{list-style:none;display:flex;gap:9px;margin:7px 0;font-size:15px;color:var(--ink2)}
.box li::before{content:'✓';color:var(--ok);font-weight:700}
.ring{display:flex;align-items:center;gap:14px}
.ring svg{flex:none;transform:rotate(-90deg)}
.ring circle{fill:none;stroke-width:6}
.ring .rb{stroke:#eef0f8}
.ring .rf{stroke:url(#rg);stroke-linecap:round;transition:stroke-dashoffset 1.2s var(--ease)}
.ring b{font-size:21px;display:block;line-height:1.2}
.ring small{color:var(--muted)}
.chap{background:#fff;border-radius:var(--r);box-shadow:var(--sh);margin-bottom:14px;overflow:hidden}
.chap summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:12px;padding:15px 18px;font-weight:600;font-size:16.5px}
.chap summary::-webkit-details-marker{display:none}
.chap summary b{flex:none;width:36px;height:36px;border-radius:11px;background:var(--grad);color:#fff;display:grid;place-items:center;font-size:15px}
.chap summary span{flex:1;min-width:0}
.chap summary small{flex:none;color:var(--muted);font-weight:500;font-size:13.5px}
.chap summary::after{content:'⌄';color:var(--muted);transition:transform .3s}
.chap[open] summary::after{transform:rotate(180deg)}
.lesson{display:flex;align-items:center;gap:11px;padding:11px 18px;border-top:1px solid var(--line);transition:background .2s,padding .25s var(--ease)}
.lesson:hover{background:#f7f6ff;padding-left:23px}
.lesson>i{flex:none;font-style:normal;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:600;background:#f1f2fa;color:var(--ink2)}
.lesson.done>i{background:var(--ok);color:#fff}
.lesson div{min-width:0;flex:1}
.lesson h3{font-size:15.5px;font-weight:600}
.lesson p{font-size:13.5px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lesson>u{color:var(--brand);text-decoration:none;flex:none}

/* lesson article */
.lead-bar{position:fixed;top:0;left:0;right:0;height:3px;z-index:60;background:var(--grad);transform-origin:left;transform:scaleX(0)}
.article{background:#fff;border-radius:var(--r);box-shadow:var(--sh);padding:clamp(18px,3.4vw,36px)}
.prose{font-size:16.5px;line-height:1.85;color:#262e4d;overflow-wrap:anywhere}
.prose h3{font-size:20px;margin:24px 0 8px;color:var(--ink)}
.prose h3:first-child{margin-top:0}
.prose h4{font-size:17px;margin:16px 0 4px}
.prose p{margin-bottom:12px}
.prose ul,.prose ol{margin:0 0 14px 22px}
.prose li{margin-bottom:5px}
.prose strong{color:var(--ink);font-weight:600}
.prose code{background:#f1f0ff;color:#4c3fd6;border-radius:5px;padding:1px 6px;font:500 .88em/1.4 'JetBrains Mono',Consolas,monospace}
.prose pre{background:#11142e;color:#e7e9f7;border-radius:12px;padding:14px 16px;margin:12px 0 16px;overflow-x:auto;font:400 14px/1.65 'JetBrains Mono',Consolas,monospace}
.prose pre code{background:none;color:inherit;padding:0;font:inherit}
.prose blockquote{border-left:4px solid var(--brand);background:#f6f5ff;padding:10px 15px;margin:12px 0;border-radius:0 10px 10px 0}
.prose .tw{overflow-x:auto;margin:10px 0 16px}
.prose table{border-collapse:collapse;width:100%;min-width:320px;font-size:15px;overflow-wrap:normal}
.prose th{background:#f1f0ff;text-align:left;font-weight:600}
.prose th,.prose td{border:1px solid var(--line);padding:7px 11px;vertical-align:top}
.prose .key{background:#ecfdf5;border-radius:12px;padding:12px 16px;margin:16px 0}
.prose .key b{color:var(--ok)}
.prose .ask{background:#fff8eb;border-radius:12px;padding:12px 16px;margin:18px 0 6px}
.prose .ask>b{color:var(--warn);display:block;margin-bottom:4px}
.prose .ask ol{margin-bottom:0}
.lnav{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}
.lnav a{background:#fff;border-radius:14px;box-shadow:var(--sh);padding:12px 16px;transition:transform .25s var(--ease),box-shadow .25s}
.lnav a:hover{transform:translateY(-3px);box-shadow:var(--sh2)}
.lnav small{display:block;color:var(--muted)}
.lnav b{font-weight:600;font-size:15px}
.lnav a.nx{text-align:right;background:var(--grad);color:#fff}
.lnav a.nx small{color:rgba(255,255,255,.82)}
.toc a{display:block;padding:6px 10px;border-radius:9px;font-size:14px;color:var(--ink2)}
.toc a:hover{background:#f3f2ff}
.toc a.on{background:#f0eeff;color:var(--brand);font-weight:600}
.toc small{display:block;font-weight:600;color:var(--muted);margin:9px 0 2px;padding:0 10px}

/* learner view (topic.php) */
.viewer{display:grid;grid-template-columns:300px 1fr;align-items:start}
.vside{position:sticky;top:66px;height:calc(100vh - 66px);overflow-y:auto;background:#fff;border-right:1px solid var(--line);padding:12px 8px 30px}
.vmain{padding:clamp(16px,3vw,32px);min-width:0}
.vinner{max-width:800px;margin:0 auto}
.vhead{margin-bottom:14px}
.vhead small{color:var(--muted);font-weight:500}
.vhead h1{font-size:clamp(22px,3.2vw,30px)}
.prog{height:7px;background:#e9ebf6;border-radius:9px;overflow:hidden;margin-top:5px}
.prog i{display:block;height:100%;background:var(--grad);border-radius:9px;transition:width .8s var(--ease)}
.video{aspect-ratio:16/9;border-radius:14px;overflow:hidden;margin:14px 0;background:var(--dark)}
.video iframe,.video video{width:100%;height:100%;border:0}
.vplay{width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:9px;color:#fff}
.vplay b{width:62px;height:62px;border-radius:50%;background:var(--grad);display:grid;place-items:center;font-size:21px;transition:transform .3s var(--ease)}
.vplay:hover b{transform:scale(1.12)}
.doc{display:flex;gap:11px;align-items:center;background:#fff;border-radius:12px;box-shadow:var(--sh);padding:11px 15px;margin:8px 0}
.drawer-btn{display:none}

/* dashboard */
.dstats{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:14px;margin:-34px 0 26px;position:relative;z-index:2}
.dstats div{background:#fff;border-radius:16px;box-shadow:var(--sh);padding:15px 18px}
.dstats b{display:block;font-size:27px;line-height:1.3}
.dstats span{color:var(--muted);font-size:14px}
.feed div{display:flex;gap:11px;padding:9px 0;border-top:1px solid var(--line);font-size:15px}
.feed div:first-child{border-top:0}
.feed small{display:block;color:var(--muted)}
.empty{text-align:center;padding:34px 16px;color:var(--muted)}
.empty .btn{margin-top:12px}

/* sign-in pages */
.auth{min-height:100vh;display:grid;place-items:center;padding:24px 16px;position:relative;overflow:hidden;background:#0f1230;isolation:isolate}
.auth-card{width:100%;max-width:420px;background:#fff;border-radius:22px;padding:clamp(22px,4vw,34px);box-shadow:0 40px 80px -30px rgba(0,0,0,.7);animation:up .6s var(--ease) both}
@keyframes up{from{opacity:0;transform:translateY(22px)}}
.auth-card .logo{justify-content:center;margin-bottom:4px}
.auth-card .s{text-align:center;color:var(--muted);margin-bottom:18px}
.field{margin-bottom:13px}
.field label{display:block;font-weight:600;font-size:14.5px;margin-bottom:3px}
.field input{width:100%;padding:11px 14px;border:1px solid #d9ddee;border-radius:11px;font:inherit;font-size:15.5px;color:var(--ink);transition:border-color .2s,box-shadow .2s}
.field input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(91,78,240,.15)}
.msg{display:none;padding:9px 13px;border-radius:10px;margin-bottom:12px;font-size:14.5px}
.msg.err{background:#fef2f2;color:#991b1b}.msg.ok{background:#ecfdf5;color:#065f46}
.auth-links{text-align:center;margin-top:15px;font-size:14.5px;color:var(--muted);line-height:2}
.auth-links a{color:var(--brand);font-weight:600}

/* footer */
.foot{background:var(--dark);color:#aeb4d4;padding:44px 0 22px;font-size:15px}
.foot-g{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:26px}
.foot h4{color:#fff;font-size:15.5px;margin-bottom:8px}
.foot ul{list-style:none}
.foot li{margin:5px 0}
.foot a:hover{color:#fff}
.foot .logo{color:#fff;margin-bottom:8px}
.foot-b{border-top:1px solid rgba(255,255,255,.1);margin-top:26px;padding-top:15px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;font-size:14px}

/* toast + scroll-in */
.toasts{position:fixed;right:16px;bottom:16px;z-index:90;display:grid;gap:8px}
.toast{background:var(--ink);color:#fff;border-radius:12px;padding:10px 16px;font-size:14.5px;animation:up .35s var(--ease) both}
.rv{opacity:0;transform:translateY(20px);transition:opacity .65s ease,transform .7s var(--ease)}
.rv.in{opacity:1;transform:none}
.cc.rv.in:hover{transform:translateY(-6px)}

@media(max-width:940px){
  .hero .wrap,.spot,.cols{grid-template-columns:1fr}
  .side{position:static}
  .demo{max-width:440px;margin:6px auto 0;width:100%}
  .foot-g{grid-template-columns:1fr 1fr}
  .viewer{grid-template-columns:1fr}
  .vside{display:none;position:static;height:auto;max-height:60vh;border:0;border-bottom:1px solid var(--line)}
  .vside.open{display:block}
  .drawer-btn{display:flex;margin-bottom:10px}
}
@media(max-width:720px){
  .nav-links{display:none;position:absolute;left:0;right:0;top:66px;margin:0;background:#fff;flex-direction:column;padding:8px 12px;border-bottom:1px solid var(--line);box-shadow:var(--sh)}
  .nav-links.open{display:flex}
  .menu-btn{display:inline-flex}
  .me span{display:none}.me{padding:4px}
  .chip-fl{display:none}
  .lnav{grid-template-columns:1fr}
  /* phones: keep scrolling smooth — no blur on the sticky bar, calmer backgrounds */
  .nav{background:#fff;backdrop-filter:none;-webkit-backdrop-filter:none}
  .aurora i{animation:none;filter:blur(50px)}
  .demo{animation:none}
  .chap,.sec.alt{content-visibility:auto;contain-intrinsic-size:auto 300px}
}
@media(max-width:460px){.foot-g{grid-template-columns:1fr}.nav-right .btn-line{display:none}.btn-lg{width:100%}}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .rv,.demo-row{opacity:1;transform:none}
}