/* ================================================================
   VELTRIX IDE — style.css  v3.0
   4 Themes: Aquatic | Dark | Light | Neon
   Glassmorphism · Mobile-First · Full Production
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ================================================================
   1. RESET
   ================================================================ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:'Syne',system-ui,sans-serif;line-height:1.6;min-height:100vh;overflow-x:hidden;transition:background .3s,color .3s}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{cursor:pointer;font-family:inherit;border:none;background:none}
ul,ol{list-style:none}
textarea,input,select{font-family:inherit;font-size:inherit}

/* ================================================================
   2. THEME TOKENS
   ================================================================ */

/* ── AQUATIC: deep ocean, teal/cyan accent ── */
[data-theme="aquatic"] {
  --bg:      #070e1d;
  --bg2:     #0b1427;
  --bg3:     #0f1c35;
  --glass:   rgba(11,20,39,.74);
  --gb:      rgba(20,184,166,.20);
  --nav:     rgba(7,14,29,.86);
  --bdr:     rgba(20,184,166,.14);
  --bdr-s:   #1a3050;
  --t1:      #e2eef8;
  --t2:      #7ba8cc;
  --t3:      #3d6080;
  --ac:      #14b8a6;
  --ac2:     #06d6c7;
  --ac3:     #0ea5e9;
  --glow:    rgba(20,184,166,.24);
  --sub:     rgba(20,184,166,.09);
  --grad:    linear-gradient(135deg,#14b8a6 0%,#0ea5e9 100%);
  --grad-fg: #fff;
  --green:   #22c55e;
  --yellow:  #eab308;
  --red:     #ef4444;
  --sh-sm:   0 2px 8px rgba(0,0,0,.40);
  --sh-md:   0 6px 28px rgba(0,0,0,.54);
  --sh-lg:   0 14px 52px rgba(0,0,0,.70);
  --sh-gl:   0 0 32px rgba(20,184,166,.22);
  --r:       12px;
  --r-sm:    8px;
  --r-lg:    18px;
  --ie-bg:   #050c18;
  --ie-side: #080f20;
  --ie-edit: #040a14;
  --ie-tab:  #0a1223;
  --ie-act:  #040a14;
  --ie-bdr:  #0f1e35;
  --ie-st:   #062236;
}

/* ── DARK: graphite, violet/purple accent ── */
[data-theme="dark"] {
  --bg:      #0a0a0a;
  --bg2:     #111111;
  --bg3:     #1a1a1a;
  --glass:   rgba(15,15,15,.74);
  --gb:      rgba(139,92,246,.20);
  --nav:     rgba(10,10,10,.86);
  --bdr:     rgba(139,92,246,.14);
  --bdr-s:   #2a2a2a;
  --t1:      #f2f2f2;
  --t2:      #888;
  --t3:      #555;
  --ac:      #8b5cf6;
  --ac2:     #a78bfa;
  --ac3:     #ec4899;
  --glow:    rgba(139,92,246,.26);
  --sub:     rgba(139,92,246,.09);
  --grad:    linear-gradient(135deg,#8b5cf6 0%,#ec4899 100%);
  --grad-fg: #fff;
  --green:   #4ade80;
  --yellow:  #facc15;
  --red:     #f87171;
  --sh-sm:   0 2px 8px rgba(0,0,0,.55);
  --sh-md:   0 6px 28px rgba(0,0,0,.70);
  --sh-lg:   0 14px 52px rgba(0,0,0,.84);
  --sh-gl:   0 0 32px rgba(139,92,246,.22);
  --r:12px;--r-sm:8px;--r-lg:18px;
  --ie-bg:#060606;--ie-side:#0a0a0a;--ie-edit:#040404;
  --ie-tab:#0f0f0f;--ie-act:#040404;--ie-bdr:#1e1e1e;--ie-st:#16082a;
}

/* ── LIGHT: clean white, teal accent ── */
[data-theme="light"] {
  --bg:      #f8fafc;
  --bg2:     #f1f5f9;
  --bg3:     #e2e8f0;
  --glass:   rgba(255,255,255,.80);
  --gb:      rgba(13,148,136,.18);
  --nav:     rgba(248,250,252,.90);
  --bdr:     rgba(13,148,136,.15);
  --bdr-s:   #cbd5e1;
  --t1:      #0f172a;
  --t2:      #475569;
  --t3:      #94a3b8;
  --ac:      #0d9488;
  --ac2:     #14b8a6;
  --ac3:     #0284c7;
  --glow:    rgba(13,148,136,.18);
  --sub:     rgba(13,148,136,.08);
  --grad:    linear-gradient(135deg,#0d9488 0%,#0284c7 100%);
  --grad-fg: #fff;
  --green:   #16a34a;
  --yellow:  #ca8a04;
  --red:     #dc2626;
  --sh-sm:   0 2px 8px rgba(0,0,0,.07);
  --sh-md:   0 6px 28px rgba(0,0,0,.11);
  --sh-lg:   0 14px 52px rgba(0,0,0,.16);
  --sh-gl:   0 0 28px rgba(13,148,136,.14);
  --r:12px;--r-sm:8px;--r-lg:18px;
  --ie-bg:#e2e8f0;--ie-side:#f1f5f9;--ie-edit:#fff;
  --ie-tab:#f8fafc;--ie-act:#fff;--ie-bdr:#cbd5e1;--ie-st:#0d9488;
}

/* ── NEON: pitch black, electric green ── */
[data-theme="neon"] {
  --bg:      #000;
  --bg2:     #060606;
  --bg3:     #0e0e0e;
  --glass:   rgba(5,5,5,.88);
  --gb:      rgba(57,255,20,.20);
  --nav:     rgba(0,0,0,.92);
  --bdr:     rgba(57,255,20,.14);
  --bdr-s:   #162216;
  --t1:      #e8ffe8;
  --t2:      #4adf4a;
  --t3:      #1e5a1e;
  --ac:      #39ff14;
  --ac2:     #00ff88;
  --ac3:     #00e5ff;
  --glow:    rgba(57,255,20,.28);
  --sub:     rgba(57,255,20,.07);
  --grad:    linear-gradient(135deg,#39ff14 0%,#00ff88 100%);
  --grad-fg: #000;
  --green:   #39ff14;
  --yellow:  #ffff00;
  --red:     #ff1744;
  --sh-sm:   0 2px 8px rgba(0,0,0,.65);
  --sh-md:   0 6px 28px rgba(0,0,0,.80);
  --sh-lg:   0 14px 52px rgba(0,0,0,.92);
  --sh-gl:   0 0 40px rgba(57,255,20,.24);
  --r:12px;--r-sm:8px;--r-lg:18px;
  --ie-bg:#000;--ie-side:#030303;--ie-edit:#020202;
  --ie-tab:#050505;--ie-act:#020202;--ie-bdr:#0c1e0c;--ie-st:#071407;
}

/* ================================================================
   3. BASE
   ================================================================ */
body{background:var(--bg);color:var(--t1);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;}

.container{width:100%;max-width:1200px;margin:0 auto;padding:0 16px;}
@media(min-width:640px){.container{padding:0 24px;}}
@media(min-width:1024px){.container{padding:0 32px;}}

.divider{height:1px;background:var(--bdr);}
.section{padding:72px 0;}
@media(max-width:640px){.section{padding:52px 0;}}

/* ================================================================
   4. NAVBAR — Glassmorphism + Mobile-First
   ================================================================ */
.navbar{
  position:sticky;top:0;z-index:1000;
  background:var(--nav);
  backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);
  border-bottom:1px solid var(--gb);
  transition:background .3s;
}
.nav-wrap{
  max-width:1200px;margin:0 auto;padding:0 16px;
  height:64px;display:flex;align-items:center;gap:8px;
}
@media(min-width:640px){.nav-wrap{padding:0 24px;}}

/* Logo */
.nav-logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:17px;letter-spacing:-.03em;color:var(--t1);flex-shrink:0;}
.logo-mark{width:34px;height:34px;border-radius:var(--r-sm);background:var(--grad);display:flex;align-items:center;justify-content:center;flex-shrink:0;box-shadow:var(--sh-gl);}
.logo-mark svg{width:18px;height:18px;color:#fff;}

/* Desktop links — hidden below 768px */
.nav-links{display:none;align-items:center;gap:2px;flex:1;padding-left:20px;}
@media(min-width:768px){.nav-links{display:flex;}}
.nav-links a{display:inline-flex;align-items:center;height:36px;padding:0 13px;border-radius:var(--r-sm);font-size:14px;font-weight:600;color:var(--t2);transition:all .15s;white-space:nowrap;position:relative;}
.nav-links a:hover{color:var(--t1);background:var(--sub);}
.nav-links a.active{color:var(--ac);background:var(--sub);}
.nav-links a.active::after{content:'';position:absolute;bottom:4px;left:13px;right:13px;height:2px;background:var(--ac);border-radius:2px;box-shadow:0 0 8px var(--glow);}

/* Right group */
.nav-right{display:flex;align-items:center;gap:7px;margin-left:auto;flex-shrink:0;}
.nav-auth{display:flex;align-items:center;gap:6px;}
.nav-user{display:none;align-items:center;gap:8px;}
.nav-avatar{width:32px;height:32px;border-radius:50%;background:var(--grad);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:var(--grad-fg);box-shadow:var(--sh-gl);flex-shrink:0;}
.nav-uname{font-size:13px;font-weight:700;color:var(--t1);display:none;}
@media(min-width:640px){.nav-uname{display:inline;}}

/* Theme picker */
.theme-sel{position:relative;}
.theme-btn{display:inline-flex;align-items:center;gap:6px;height:34px;padding:0 10px;background:var(--glass);border:1px solid var(--gb);border-radius:var(--r-sm);font-size:12px;font-weight:600;color:var(--t2);cursor:pointer;backdrop-filter:blur(12px);transition:all .15s;white-space:nowrap;}
.theme-btn svg{width:14px;height:14px;flex-shrink:0;}
.theme-btn:hover{color:var(--ac);border-color:var(--ac);box-shadow:var(--sh-gl);}
.t-label{display:none;}
@media(min-width:480px){.t-label{display:inline;}}
.theme-dd{display:none;position:absolute;top:calc(100% + 10px);right:0;min-width:175px;background:var(--glass);border:1px solid var(--gb);border-radius:var(--r);backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);box-shadow:var(--sh-lg);padding:6px;z-index:1100;}
.theme-dd.open{display:block;}
.t-item{display:flex;align-items:center;gap:10px;height:36px;padding:0 10px;border-radius:var(--r-sm);font-size:13px;font-weight:500;color:var(--t2);cursor:pointer;transition:all .12s;}
.t-item:hover{background:var(--sub);color:var(--t1);}
.t-item.active{color:var(--ac);font-weight:700;}
.t-dot{width:10px;height:10px;border-radius:50%;flex-shrink:0;box-shadow:0 0 6px currentColor;}

/* Hamburger — shown only on mobile */
.nav-ham{display:flex;flex-direction:column;justify-content:center;gap:5px;width:38px;height:38px;padding:8px;background:var(--glass);border:1px solid var(--gb);border-radius:var(--r-sm);cursor:pointer;flex-shrink:0;transition:border-color .15s;backdrop-filter:blur(8px);}
.nav-ham span{display:block;width:100%;height:2px;background:var(--t2);border-radius:2px;transition:transform .22s,opacity .22s,background .15s;}
.nav-ham:hover{border-color:var(--ac);}
.nav-ham:hover span{background:var(--ac);}
.nav-ham.open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-ham.open span:nth-child(2){opacity:0;transform:scaleX(0);}
.nav-ham.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
@media(min-width:768px){.nav-ham{display:none;}}

/* Mobile drawer */
.nav-drawer{display:none;flex-direction:column;gap:2px;padding:10px 16px 16px;background:var(--nav);backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);border-bottom:1px solid var(--gb);}
.nav-drawer.open{display:flex;}
@media(min-width:768px){.nav-drawer{display:none!important;}}
.nav-drawer a{display:flex;align-items:center;height:44px;padding:0 14px;border-radius:var(--r-sm);font-size:15px;font-weight:600;color:var(--t2);transition:all .15s;}
.nav-drawer a:hover{background:var(--sub);color:var(--t1);}
.nav-drawer a.active{color:var(--ac);background:var(--sub);}

/* ================================================================
   5. BUTTONS
   ================================================================ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 22px;border-radius:var(--r);font-size:15px;font-weight:700;letter-spacing:-.01em;cursor:pointer;border:none;font-family:inherit;transition:all .2s;white-space:nowrap;}
.btn:active{transform:scale(.97);}
.btn-primary{background:var(--grad);color:var(--grad-fg);box-shadow:var(--sh-gl);}
.btn-primary:hover{filter:brightness(1.1);box-shadow:var(--sh-gl),var(--sh-md);transform:translateY(-1px);}
.btn-ghost{background:var(--glass);border:1px solid var(--gb);color:var(--t2);backdrop-filter:blur(12px);}
.btn-ghost:hover{border-color:var(--ac);color:var(--t1);box-shadow:0 0 16px var(--glow);}
.btn-sm{height:34px;padding:0 14px;font-size:13px;border-radius:var(--r-sm);}
.btn-lg{height:52px;padding:0 32px;font-size:16px;border-radius:var(--r-lg);}
.btn-full{width:100%;}

/* ================================================================
   6. HERO
   ================================================================ */
.hero{position:relative;padding:90px 0 82px;overflow:hidden;}
@media(max-width:640px){.hero{padding:60px 0 52px;}}
.hero-glow{position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(ellipse 90% 70% at 20% -10%,var(--glow) 0%,transparent 60%),
             radial-gradient(ellipse 50% 40% at 85% 110%,rgba(14,165,233,.08) 0%,transparent 55%);}
.hero-grid{position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(var(--bdr) 1px,transparent 1px),
                   linear-gradient(90deg,var(--bdr) 1px,transparent 1px);
  background-size:52px 52px;opacity:.55;}
.hero-inner{position:relative;z-index:1;max-width:820px;}
.hero-chip{display:inline-flex;align-items:center;gap:8px;height:32px;padding:0 14px;background:var(--sub);border:1px solid var(--gb);border-radius:30px;font-size:12px;font-weight:700;color:var(--ac);font-family:'JetBrains Mono',monospace;letter-spacing:.06em;margin-bottom:24px;backdrop-filter:blur(8px);}
.chip-dot{width:7px;height:7px;border-radius:50%;background:var(--ac);box-shadow:0 0 8px var(--ac);animation:blink 2s infinite;}
@keyframes blink{0%,100%{opacity:1;transform:scale(1);}50%{opacity:.45;transform:scale(.8);}}
.hero h1{font-size:clamp(38px,7vw,84px);font-weight:800;letter-spacing:-.055em;line-height:1.02;color:var(--t1);margin-bottom:20px;}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;}
.hero-sub{font-size:clamp(15px,2.2vw,19px);color:var(--t2);line-height:1.72;max-width:560px;margin-bottom:36px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center;}
.hero-stats{display:flex;flex-wrap:wrap;gap:36px;margin-top:68px;padding-top:40px;border-top:1px solid var(--bdr);}
@media(max-width:480px){.hero-stats{gap:22px;}}
.stat{display:flex;flex-direction:column;gap:2px;}
.stat-n{font-size:clamp(28px,4vw,44px);font-weight:800;letter-spacing:-.04em;line-height:1;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;font-family:'JetBrains Mono',monospace;}
.stat-l{font-size:13px;color:var(--t3);margin-top:4px;}

/* ================================================================
   7. FEATURE CARDS / SECTION HEADERS
   ================================================================ */
.s-chip{display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--ac);font-family:'JetBrains Mono',monospace;margin-bottom:12px;}
.s-chip::before{content:'//';color:var(--t3);margin-right:2px;}
.s-title{font-size:clamp(24px,4vw,44px);font-weight:800;letter-spacing:-.04em;color:var(--t1);line-height:1.1;}
.s-sub{font-size:16px;color:var(--t2);line-height:1.65;max-width:560px;margin-top:12px;}

.feat-grid{display:grid;grid-template-columns:1fr;gap:14px;margin-top:44px;}
@media(min-width:540px){.feat-grid{grid-template-columns:repeat(2,1fr);}}
@media(min-width:960px){.feat-grid{grid-template-columns:repeat(3,1fr);}}
.feat-card{background:var(--glass);border:1px solid var(--gb);border-radius:var(--r);padding:26px;backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);transition:transform .2s,box-shadow .2s,border-color .2s;}
.feat-card:hover{transform:translateY(-4px);box-shadow:var(--sh-md),var(--sh-gl);border-color:var(--ac);}
.feat-icon{width:48px;height:48px;border-radius:var(--r-sm);background:var(--sub);border:1px solid var(--gb);display:flex;align-items:center;justify-content:center;color:var(--ac);margin-bottom:16px;}
.feat-icon svg{width:22px;height:22px;}
.feat-title{font-size:16px;font-weight:700;color:var(--t1);margin-bottom:8px;}
.feat-desc{font-size:14px;color:var(--t2);line-height:1.6;}

/* ================================================================
   8. CTA BOX
   ================================================================ */
.cta-box{background:var(--glass);border:1px solid var(--gb);border-radius:var(--r-lg);padding:60px 40px;text-align:center;position:relative;overflow:hidden;backdrop-filter:blur(24px);}
@media(max-width:640px){.cta-box{padding:44px 20px;}}
.cta-box::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse 80% 80% at 50% 50%,var(--sub),transparent 70%);pointer-events:none;}
.cta-box>*{position:relative;z-index:1;}
.cta-box h2{font-size:clamp(24px,4vw,40px);font-weight:800;letter-spacing:-.04em;margin-bottom:12px;}
.cta-box p{font-size:15px;color:var(--t2);margin-bottom:28px;max-width:480px;margin-left:auto;margin-right:auto;}
.cta-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;}

/* ================================================================
   9. FOOTER
   ================================================================ */
.footer{background:var(--glass);border-top:1px solid var(--gb);backdrop-filter:blur(16px);padding:50px 0 26px;}
.footer-grid{display:grid;grid-template-columns:1fr;gap:32px;margin-bottom:40px;}
@media(min-width:640px){.footer-grid{grid-template-columns:1fr 1fr;}}
@media(min-width:900px){.footer-grid{grid-template-columns:2fr 1fr 1fr 1fr;}}
.f-brand{display:flex;align-items:center;gap:9px;font-size:16px;font-weight:800;letter-spacing:-.02em;margin-bottom:10px;}
.f-logo{width:28px;height:28px;border-radius:6px;background:var(--grad);display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.f-logo svg{width:14px;height:14px;color:#fff;}
.f-tag{font-size:13px;color:var(--t3);max-width:240px;line-height:1.55;}
.f-col h4{font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--t3);font-family:'JetBrains Mono',monospace;margin-bottom:14px;}
.f-col a{display:block;font-size:13px;font-weight:500;color:var(--t2);padding:4px 0;transition:color .12s;}
.f-col a:hover{color:var(--ac);}
.footer-bottom{display:flex;flex-direction:column;gap:10px;padding-top:24px;border-top:1px solid var(--bdr);}
@media(min-width:640px){.footer-bottom{flex-direction:row;align-items:center;justify-content:space-between;}}
.f-copy{font-size:12px;color:var(--t3);}
.f-legal{display:flex;gap:16px;}
.f-legal a{font-size:12px;color:var(--t3);transition:color .12s;}
.f-legal a:hover{color:var(--ac);}

/* ================================================================
   10. MODALS
   ================================================================ */
.modal{display:none;position:fixed;inset:0;z-index:9100;background:rgba(0,0,0,.72);align-items:center;justify-content:center;padding:16px;backdrop-filter:blur(6px);}
.modal.open{display:flex;}
.modal-box{background:var(--glass);border:1px solid var(--gb);border-radius:var(--r-lg);width:100%;max-width:430px;box-shadow:var(--sh-lg);backdrop-filter:blur(24px);overflow:hidden;}
.modal-hd{display:flex;align-items:center;justify-content:space-between;padding:22px 24px 18px;border-bottom:1px solid var(--bdr);}
.modal-hd h2{font-size:18px;font-weight:800;letter-spacing:-.02em;}
.modal-x{width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:var(--r-sm);font-size:22px;line-height:1;color:var(--t3);transition:all .12s;}
.modal-x:hover{color:var(--red);background:rgba(239,68,68,.1);}
.modal-form{padding:20px 24px 24px;display:flex;flex-direction:column;gap:14px;}
.f-lbl{display:flex;flex-direction:column;gap:6px;font-size:13px;font-weight:600;color:var(--t2);}
.f-inp{height:42px;padding:0 13px;background:var(--bg2);border:1px solid var(--bdr-s);border-radius:var(--r-sm);color:var(--t1);font-size:14px;outline:none;transition:border-color .15s,box-shadow .15s;}
.f-inp:focus{border-color:var(--ac);box-shadow:0 0 0 3px var(--glow);}
.f-err{font-size:13px;color:var(--red);padding:9px 11px;background:rgba(239,68,68,.1);border-radius:var(--r-sm);border:1px solid rgba(239,68,68,.2);}
.modal-ft{font-size:13px;color:var(--t3);text-align:center;}
.link-btn{color:var(--ac);font-weight:700;background:none;border:none;cursor:pointer;font-family:inherit;font-size:inherit;}
.link-btn:hover{text-decoration:underline;}

/* Toast */
.toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%) translateY(20px);z-index:9999;opacity:0;pointer-events:none;background:var(--glass);color:var(--t1);font-size:13px;font-family:'JetBrains Mono',monospace;padding:11px 24px;border-radius:var(--r);border:1px solid var(--gb);box-shadow:var(--sh-md);backdrop-filter:blur(20px);transition:opacity .22s,transform .22s;}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

/* ================================================================
   11. TUTORIALS PAGE
   ================================================================ */
.tut-hero{padding:56px 0 40px;border-bottom:1px solid var(--bdr);margin-bottom:30px;}
@media(max-width:640px){.tut-hero{padding:40px 0 28px;}}
.tut-hero h1{font-size:clamp(28px,5vw,52px);font-weight:800;letter-spacing:-.04em;margin-bottom:10px;}
.tut-hero p{font-size:15px;color:var(--t2);max-width:520px;line-height:1.65;}

.tut-filter{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:26px;flex-wrap:wrap;}
.tut-pills{display:flex;gap:6px;flex-wrap:wrap;}
.tut-pill{height:36px;padding:0 18px;background:var(--glass);border:1px solid var(--gb);border-radius:30px;font-size:13px;font-weight:600;color:var(--t2);cursor:pointer;font-family:'Syne',sans-serif;backdrop-filter:blur(12px);transition:all .15s;}
.tut-pill:hover{border-color:var(--ac);color:var(--t1);background:var(--sub);}
.tut-pill.active{background:var(--grad);border-color:transparent;color:var(--grad-fg);box-shadow:var(--sh-gl);}
.tut-cnt{font-size:12px;font-family:'JetBrains Mono',monospace;color:var(--t3);}

/* 1 → 2 → 3 → 4 columns */
.tut-grid{display:grid;grid-template-columns:1fr;gap:16px;padding-bottom:80px;}
@media(min-width:520px){.tut-grid{grid-template-columns:repeat(2,1fr);}}
@media(min-width:900px){.tut-grid{grid-template-columns:repeat(3,1fr);}}
@media(min-width:1200px){.tut-grid{grid-template-columns:repeat(4,1fr);gap:18px;}}

.tut-card{background:var(--glass);border:1px solid var(--gb);border-radius:var(--r);overflow:hidden;display:flex;flex-direction:column;backdrop-filter:blur(16px);transition:transform .2s,box-shadow .2s,border-color .2s;}
.tut-card:hover{transform:translateY(-4px);box-shadow:var(--sh-md),var(--sh-gl);border-color:var(--ac);}
.tut-card[hidden]{display:none;}

/* 16:9 video ratio */
.tut-vid{position:relative;width:100%;padding-bottom:56.25%;background:#000;flex-shrink:0;}
.tut-vid iframe{position:absolute;inset:0;width:100%;height:100%;border:none;display:block;}
.tut-num{position:absolute;top:9px;left:9px;background:rgba(0,0,0,.82);color:#fff;font-size:10px;font-family:'JetBrains Mono',monospace;font-weight:700;padding:3px 8px;border-radius:5px;z-index:2;pointer-events:none;}

.tut-body{padding:14px 15px 16px;display:flex;flex-direction:column;gap:9px;flex:1;}
.tut-badge{display:inline-flex;align-items:center;width:fit-content;font-size:10px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;padding:3px 9px;border-radius:5px;font-family:'JetBrains Mono',monospace;}
.lvl-b{background:rgba(34,197,94,.12);color:#22c55e;border:1px solid rgba(34,197,94,.22);}
.lvl-i{background:rgba(234,179,8,.12);color:#eab308;border:1px solid rgba(234,179,8,.22);}
.lvl-a{background:rgba(239,68,68,.12);color:#ef4444;border:1px solid rgba(239,68,68,.22);}
.tut-title{font-size:13px;font-weight:700;color:var(--t1);line-height:1.4;}
.tut-watch{display:inline-flex;align-items:center;gap:5px;margin-top:auto;align-self:flex-end;height:30px;padding:0 12px;background:var(--sub);border:1px solid var(--gb);border-radius:var(--r-sm);font-size:12px;font-weight:700;color:var(--ac);font-family:'Syne',sans-serif;transition:all .15s;}
.tut-watch:hover{background:var(--grad);border-color:transparent;color:var(--grad-fg);box-shadow:var(--sh-gl);}
.tut-watch svg{width:11px;height:11px;}

/* ================================================================
   12. LAB PAGE — Full-Screen IDE
   ================================================================ */
html.is-lab,html.is-lab body{height:100%;overflow:hidden;}
.lab-pg{display:flex;flex-direction:column;height:100vh;overflow:hidden;background:var(--ie-bg);}

/* Gate — shown when logged out */
.lab-gate{display:none;flex:1;flex-direction:column;align-items:center;justify-content:center;padding:40px 20px;text-align:center;gap:16px;}
.lab-gate.show{display:flex;}
.gate-ring{width:72px;height:72px;border-radius:50%;background:var(--sub);border:2px solid var(--gb);display:flex;align-items:center;justify-content:center;font-size:32px;margin-bottom:4px;box-shadow:var(--sh-gl);}
.lab-gate h2{font-size:clamp(22px,4vw,32px);font-weight:800;letter-spacing:-.02em;}
.lab-gate p{font-size:15px;color:var(--t2);max-width:420px;line-height:1.6;}
.gate-btns{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:8px;}

/* IDE wrap — shown when logged in */
.ide-wrap{display:none;flex:1;flex-direction:column;min-height:0;overflow:hidden;}
.ide-wrap.show{display:flex;}

/* ══════════════════════════════════════════════════════════════
   MOBILE FIRST — 3 panels stack vertically  (flex-direction: column)
   DESKTOP ≥900px — panels sit side-by-side  (flex-direction: row)
   ══════════════════════════════════════════════════════════════ */
.ide-body{
  display:flex;
  flex-direction:column;    /* MOBILE: vertical stack */
  flex:1;min-height:0;overflow:hidden;
}
@media(min-width:900px){
  .ide-body{flex-direction:row;}   /* DESKTOP: 3 columns */
}

/* ── COL 1: File Explorer ── */
.ide-side{
  width:100%;height:160px;       /* fixed height on mobile */
  background:var(--ie-side);
  border-bottom:1px solid var(--ie-bdr);
  display:flex;flex-direction:column;overflow:hidden;flex-shrink:0;
}
@media(min-width:900px){
  .ide-side{width:214px;height:auto;border-bottom:none;border-right:1px solid var(--ie-bdr);}
}

.sb-bar{display:flex;align-items:center;justify-content:space-between;height:36px;padding:0 12px;border-bottom:1px solid var(--ie-bdr);flex-shrink:0;}
.sb-lbl{font-size:10px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--t3);font-family:'JetBrains Mono',monospace;}
.sb-acts{display:flex;gap:2px;}
.sb-icon{width:26px;height:26px;display:flex;align-items:center;justify-content:center;border-radius:5px;color:var(--t3);transition:all .12s;}
.sb-icon svg{width:14px;height:14px;}
.sb-icon:hover{color:var(--ac);background:var(--sub);}

.ftree{flex:1;overflow-y:auto;padding:4px 0;}
.ftree::-webkit-scrollbar{width:4px;}
.ftree::-webkit-scrollbar-thumb{background:var(--ie-bdr);border-radius:2px;}
.tree-empty{padding:12px 14px;font-size:12px;color:var(--t3);font-family:'JetBrains Mono',monospace;}
.tree-row{display:flex;align-items:center;gap:7px;height:28px;padding:0 8px 0 12px;cursor:pointer;transition:background .1s;user-select:none;position:relative;}
.tree-row:hover{background:var(--sub);}
.tree-row.active{background:var(--sub);}
.tree-row.active .tree-nm{color:var(--ac);font-weight:600;}
.tree-ic{font-size:13px;flex-shrink:0;line-height:1;}
.tree-nm{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13px;color:var(--t2);font-family:'JetBrains Mono',monospace;}
.tree-dot{width:22px;height:22px;display:flex;align-items:center;justify-content:center;border-radius:4px;color:var(--t3);opacity:0;flex-shrink:0;transition:opacity .12s,color .12s;}
.tree-dot svg{width:12px;height:12px;}
.tree-row:hover .tree-dot{opacity:1;}
.tree-dot:hover{color:var(--ac);}

/* ── COL 2: Code Editor ── */
.ide-mid{flex:1;display:flex;flex-direction:column;min-height:0;min-width:0;overflow:hidden;border-bottom:1px solid var(--ie-bdr);}
@media(min-width:900px){.ide-mid{border-bottom:none;border-right:1px solid var(--ie-bdr);}}

.ide-tabs{display:flex;height:36px;background:var(--ie-tab);border-bottom:1px solid var(--ie-bdr);overflow-x:auto;flex-shrink:0;scrollbar-width:none;}
.ide-tabs::-webkit-scrollbar{display:none;}
.tabs-empty{display:flex;align-items:center;padding:0 14px;font-size:12px;color:var(--t3);font-family:'JetBrains Mono',monospace;}
.ide-tab{display:inline-flex;align-items:center;gap:6px;height:100%;padding:0 14px;background:transparent;border:none;border-right:1px solid var(--ie-bdr);font-size:12px;font-family:'JetBrains Mono',monospace;color:var(--t3);cursor:pointer;white-space:nowrap;flex-shrink:0;transition:all .12s;}
.ide-tab:hover{color:var(--t1);background:var(--sub);}
.ide-tab.active{color:var(--ac);background:var(--ie-act);border-bottom:2px solid var(--ac);box-shadow:0 -1px 8px var(--glow);}
.tab-nm{max-width:120px;overflow:hidden;text-overflow:ellipsis;}
.tab-x{width:16px;height:16px;display:flex;align-items:center;justify-content:center;border-radius:3px;font-size:14px;line-height:1;color:var(--t3);flex-shrink:0;transition:all .12s;}
.tab-x:hover{color:var(--red);background:rgba(239,68,68,.1);}

#ide-editor{flex:1;width:100%;min-height:0;background:var(--ie-edit);color:var(--t1);border:none;outline:none;padding:16px 18px;font-family:'JetBrains Mono',monospace;font-size:13px;line-height:1.8;resize:none;tab-size:2;overflow:auto;caret-color:var(--ac);}
#ide-editor::-webkit-scrollbar{width:6px;height:6px;}
#ide-editor::-webkit-scrollbar-thumb{background:var(--ie-bdr);border-radius:3px;}

.img-prev{display:none;flex:1;align-items:center;justify-content:center;background:var(--ie-edit);padding:20px;}
.img-prev.show{display:flex;}
.img-prev img{max-width:100%;max-height:100%;object-fit:contain;border-radius:var(--r);}

.ide-status{height:24px;flex-shrink:0;background:var(--ie-st);display:flex;align-items:center;padding:0 14px;gap:12px;font-size:11px;font-family:'JetBrains Mono',monospace;color:rgba(255,255,255,.6);}
[data-theme="light"] .ide-status{color:rgba(0,0,0,.55);}
.st-sep{width:1px;height:12px;background:rgba(255,255,255,.15);}
[data-theme="light"] .st-sep{background:rgba(0,0,0,.12);}

/* ── COL 3: Live Preview ── */
.ide-prev{flex-shrink:0;height:270px;display:flex;flex-direction:column;background:var(--ie-bg);border-top:1px solid var(--ie-bdr);}
@media(min-width:900px){.ide-prev{width:360px;height:auto;border-top:none;border-left:1px solid var(--ie-bdr);}}

.prev-head{height:36px;display:flex;align-items:center;justify-content:space-between;padding:0 10px 0 12px;border-bottom:1px solid var(--ie-bdr);background:var(--ie-tab);flex-shrink:0;}
.prev-title{font-size:10px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--t3);font-family:'JetBrains Mono',monospace;}
.prev-btns{display:flex;align-items:center;gap:5px;}
.prev-btn{display:inline-flex;align-items:center;gap:5px;height:25px;padding:0 9px;background:transparent;border:1px solid var(--ie-bdr);border-radius:5px;font-size:11px;font-family:'JetBrains Mono',monospace;color:var(--t3);cursor:pointer;transition:all .12s;}
.prev-btn:hover{color:var(--ac);border-color:var(--ac);background:var(--sub);}
.prev-btn svg{width:11px;height:11px;}
.prev-fs{width:27px;height:25px;padding:0;display:flex;align-items:center;justify-content:center;background:transparent;border:1px solid var(--ie-bdr);border-radius:5px;color:var(--t3);cursor:pointer;transition:all .12s;}
.prev-fs:hover{color:var(--ac);border-color:var(--ac);background:var(--sub);}
.prev-fs svg{width:13px;height:13px;}
#preview-frame{flex:1;border:none;background:#fff;min-height:0;display:block;}
#upload-input{display:none;}

/* Context menu */
.ctx-menu{position:fixed;z-index:9999;min-width:162px;background:var(--glass);border:1px solid var(--gb);border-radius:var(--r);box-shadow:var(--sh-lg);backdrop-filter:blur(20px);padding:5px;pointer-events:all;}
.ctx-item{display:flex;align-items:center;gap:8px;width:100%;height:32px;padding:0 10px;border-radius:var(--r-sm);font-size:13px;color:var(--t2);cursor:pointer;background:none;border:none;font-family:inherit;text-align:left;transition:all .1s;}
.ctx-item svg{width:14px;height:14px;flex-shrink:0;}
.ctx-item:hover{background:var(--sub);color:var(--t1);}
.ctx-item.danger:hover{background:rgba(239,68,68,.1);color:var(--red);}
.ctx-sep{height:1px;background:var(--bdr);margin:4px 0;}

/* Fullscreen modal */
.fs-modal{position:fixed;top:0;left:0;width:100vw;height:100vh;z-index:999999;background:var(--ie-bg);display:flex;flex-direction:column;opacity:0;pointer-events:none;transition:opacity .18s;}
.fs-modal.open{opacity:1;pointer-events:all;}
.fs-bar{height:46px;flex-shrink:0;display:flex;align-items:center;justify-content:space-between;padding:0 18px;background:var(--nav);border-bottom:1px solid var(--gb);backdrop-filter:blur(12px);gap:12px;}
.fs-bar-title{font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--t2);font-family:'JetBrains Mono',monospace;}
.fs-bar-btns{display:flex;gap:8px;align-items:center;}
.fs-btn{display:inline-flex;align-items:center;gap:6px;height:30px;padding:0 13px;background:var(--sub);border:1px solid var(--gb);border-radius:6px;font-size:12px;font-family:'JetBrains Mono',monospace;color:var(--ac);cursor:pointer;transition:all .12s;}
.fs-btn:hover{background:var(--grad);border-color:transparent;color:var(--grad-fg);box-shadow:var(--sh-gl);}
.fs-btn.close:hover{background:rgba(239,68,68,.12);border-color:rgba(239,68,68,.4);color:var(--red);box-shadow:none;}
#fs-frame{flex:1;border:none;background:#fff;width:100%;height:0;display:block;}

/* ================================================================
   13. ABOUT & CONTACT
   ================================================================ */
.inner-hero{padding:60px 0 48px;border-bottom:1px solid var(--bdr);margin-bottom:52px;}
@media(max-width:640px){.inner-hero{padding:40px 0 32px;margin-bottom:36px;}}

.about-grid{display:grid;grid-template-columns:1fr;gap:16px;margin-top:36px;}
@media(min-width:600px){.about-grid{grid-template-columns:repeat(2,1fr);}}
@media(min-width:900px){.about-grid{grid-template-columns:repeat(3,1fr);}}
.a-card{background:var(--glass);border:1px solid var(--gb);border-radius:var(--r);padding:26px;backdrop-filter:blur(14px);transition:transform .2s,border-color .2s;}
.a-card:hover{transform:translateY(-3px);border-color:var(--ac);}
.a-icon{font-size:34px;margin-bottom:14px;}
.a-card h3{font-size:16px;font-weight:700;color:var(--t1);margin-bottom:8px;}
.a-card p{font-size:14px;color:var(--t2);line-height:1.6;}

.tech-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:32px;}
.tech-tag{display:inline-flex;align-items:center;height:32px;padding:0 14px;background:var(--glass);border:1px solid var(--gb);border-radius:30px;font-size:13px;font-weight:600;color:var(--t2);font-family:'JetBrains Mono',monospace;backdrop-filter:blur(8px);transition:all .15s;}
.tech-tag:hover{border-color:var(--ac);color:var(--ac);}

.contact-wrap{display:grid;grid-template-columns:1fr;gap:44px;margin-bottom:80px;}
@media(min-width:768px){.contact-wrap{grid-template-columns:1fr 1fr;gap:52px;}}
.c-info h2{font-size:clamp(22px,3.5vw,34px);font-weight:800;letter-spacing:-.02em;margin-bottom:14px;}
.c-info p{font-size:15px;color:var(--t2);line-height:1.65;margin-bottom:28px;}
.c-links{display:flex;flex-direction:column;gap:12px;}
.c-link{display:flex;align-items:center;gap:13px;padding:15px 16px;background:var(--glass);border:1px solid var(--gb);border-radius:var(--r);font-size:14px;font-weight:600;color:var(--t2);backdrop-filter:blur(12px);transition:all .15s;}
.c-link:hover{border-color:var(--ac);color:var(--t1);box-shadow:var(--sh-gl);transform:translateX(3px);}
.c-link-ico{width:38px;height:38px;border-radius:var(--r-sm);background:var(--sub);display:flex;align-items:center;justify-content:center;color:var(--ac);flex-shrink:0;}
.c-link-meta{display:flex;flex-direction:column;gap:2px;}
.c-link-sub{font-size:11px;color:var(--t3);font-weight:500;letter-spacing:.06em;text-transform:uppercase;font-family:'JetBrains Mono',monospace;}
.c-form-box{background:var(--glass);border:1px solid var(--gb);border-radius:var(--r-lg);padding:30px 26px;backdrop-filter:blur(16px);}
.c-form-box h3{font-size:18px;font-weight:800;letter-spacing:-.02em;margin-bottom:22px;}
.c-form{display:flex;flex-direction:column;gap:14px;}
.form-row{display:grid;grid-template-columns:1fr;gap:12px;}
@media(min-width:480px){.form-row{grid-template-columns:1fr 1fr;}}
textarea.f-inp{height:auto;padding:12px 13px;resize:vertical;min-height:115px;line-height:1.55;}
.c-ok{font-size:13px;color:var(--green);padding:9px 11px;background:rgba(34,197,94,.1);border-radius:var(--r-sm);border:1px solid rgba(34,197,94,.2);}

/* ================================================================
   14. RESPONSIVE EDGE CASES
   ================================================================ */
@media(max-width:400px){
  .btn-lg{height:46px;padding:0 22px;font-size:15px;}
  .hero-actions{flex-direction:column;align-items:flex-start;}
  .cta-btns{flex-direction:column;align-items:center;}
}