/* ═══════════════════════════════════════════
   SHARED STYLES — AI & Python Training V2
═══════════════════════════════════════════ */
:root{
  --bg:#060B18;--bg2:#0A1020;--card:#0D1526;--card2:#111D35;
  --brd:rgba(99,179,255,.10);--brd2:rgba(99,179,255,.22);
  --blue:#3B82F6;--b2:#60A5FA;--b3:#93C5FD;
  --purple:#8B5CF6;--p2:#A78BFA;
  --cyan:#06B6D4;--c2:#22D3EE;
  --green:#10B981;--g2:#34D399;
  --orange:#F59E0B;--o2:#FCD34D;
  --red:#EF4444;--r2:#F87171;
  --white:#fff;--text:#E2E8F0;--muted:#94A3B8;--dim:#475569;
  --grad1:linear-gradient(135deg,#3B82F6,#8B5CF6);
  --grad2:linear-gradient(135deg,#06B6D4,#3B82F6);
  --grad3:linear-gradient(135deg,#8B5CF6,#EC4899);
  --glow:0 0 40px rgba(59,130,246,.2);
  --r:10px;--r2:18px;--r3:28px;
  --tr:.3s cubic-bezier(.4,0,.2,1);
  --fh:'Space Grotesk',sans-serif;
  --fn:'Inter',sans-serif;
  --fm:'JetBrains Mono',monospace;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--fn);background:var(--bg);color:var(--text);overflow-x:hidden}
a{text-decoration:none;color:inherit}
img{max-width:100%}
::-webkit-scrollbar{width:4px}
::-webkit-scrollbar-thumb{background:var(--blue);border-radius:2px}
/* Gradient text */
.gt{background:var(--grad1);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.gt2{background:var(--grad2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.gt3{background:var(--grad3);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
/* Tag badge */
.tag{display:inline-flex;align-items:center;gap:5px;background:rgba(59,130,246,.1);border:1px solid rgba(59,130,246,.25);color:var(--b2);font-size:.7rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;padding:5px 14px;border-radius:50px;margin-bottom:14px}
.tag.tg-p{background:rgba(139,92,246,.1);border-color:rgba(139,92,246,.25);color:var(--p2)}
.tag.tg-c{background:rgba(6,182,212,.1);border-color:rgba(6,182,212,.25);color:var(--c2)}
.tag.tg-g{background:rgba(16,185,129,.1);border-color:rgba(16,185,129,.25);color:var(--g2)}
.tag.tg-o{background:rgba(245,158,11,.1);border-color:rgba(245,158,11,.25);color:var(--o2)}
/* Buttons */
.btn{background:var(--grad1);color:#fff;font-family:var(--fh);font-weight:600;font-size:.88rem;border:none;border-radius:50px;padding:12px 26px;display:inline-flex;align-items:center;gap:7px;transition:var(--tr);cursor:pointer;text-decoration:none}
.btn:hover{color:#fff;transform:translateY(-2px);box-shadow:0 8px 24px rgba(59,130,246,.3)}
.btn-o{background:transparent;color:var(--text);border:1.5px solid var(--brd2);border-radius:50px;padding:11px 24px;display:inline-flex;align-items:center;gap:7px;font-family:var(--fh);font-weight:600;font-size:.88rem;transition:var(--tr);cursor:pointer;text-decoration:none}
.btn-o:hover{border-color:var(--blue);color:var(--b2);background:rgba(59,130,246,.07)}
.btn-c{background:var(--grad2);color:#fff;font-family:var(--fh);font-weight:600;font-size:.88rem;border:none;border-radius:50px;padding:12px 26px;display:inline-flex;align-items:center;gap:7px;transition:var(--tr);cursor:pointer;text-decoration:none}
.btn-c:hover{color:#fff;transform:translateY(-2px)}
/* Page hero */
.page-hero{padding:80px 0 56px;background:linear-gradient(180deg,#0A0F20 0%,var(--bg) 100%);border-bottom:1px solid var(--brd);position:relative;overflow:hidden;text-align:center}
.page-hero::before{content:'';position:absolute;width:600px;height:600px;border-radius:50%;background:radial-gradient(circle,rgba(59,130,246,.07) 0%,transparent 70%);top:-200px;left:50%;transform:translateX(-50%)}
.page-hero h1{font-family:var(--fh);font-size:clamp(2rem,5vw,3.2rem);font-weight:800;color:#fff;line-height:1.15;margin-bottom:14px;position:relative}
.page-hero p{font-size:1rem;color:var(--muted);max-width:580px;margin:0 auto;line-height:1.75;position:relative}
/* Cards */
.card{background:var(--card);border:1px solid var(--brd);border-radius:var(--r2);transition:var(--tr)}
.card:hover{border-color:var(--brd2);box-shadow:var(--glow)}
/* Form inputs */
.fi{width:100%;background:rgba(255,255,255,.04);border:1.5px solid var(--brd);border-radius:var(--r);padding:11px 14px;color:#fff;font-size:.88rem;font-family:var(--fn);transition:border-color .2s}
.fi:focus{outline:none;border-color:var(--blue);background:rgba(59,130,246,.04)}
.fi::placeholder{color:var(--dim)}
select.fi option{background:var(--bg2);color:#fff}
.fi-label{display:block;font-size:.77rem;font-weight:600;color:var(--text);margin-bottom:6px}
/* Section */
.section{padding:72px 0}
.section-alt{padding:72px 0;background:var(--bg2)}
.sec-title{font-family:var(--fh);font-size:clamp(1.6rem,3vw,2.4rem);font-weight:700;color:#fff;margin-bottom:12px;line-height:1.2}
.sec-sub{font-size:.95rem;color:var(--muted);line-height:1.75;max-width:560px}
/* Scroll reveal */
.sr{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.sr.d1{transition-delay:.08s}.sr.d2{transition-delay:.16s}.sr.d3{transition-delay:.24s}.sr.d4{transition-delay:.32s}
.sr.vis{opacity:1;transform:translateY(0)}
/* Footer */
.site-footer{background:var(--bg);border-top:1px solid var(--brd);padding:40px 0 24px}
.sf-inner{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px}
.sf-brand{font-family:var(--fh);font-size:1.1rem;font-weight:700;color:#fff;display:flex;align-items:center;gap:8px}
.sf-links{display:flex;gap:16px;flex-wrap:wrap}
.sf-links a{font-size:.8rem;color:var(--dim);transition:color .2s}
.sf-links a:hover{color:var(--b2)}
.sf-copy{font-size:.75rem;color:var(--dim);margin-top:20px;padding-top:18px;border-top:1px solid var(--brd);text-align:center}
/* Progress bar */
#read-bar{position:fixed;top:0;left:0;height:2.5px;background:var(--grad1);z-index:9999;width:0%;transition:width .08s linear}
/* WA FAB */
.wa-fab{position:fixed;bottom:24px;right:22px;width:50px;height:50px;border-radius:50%;background:#25D366;color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.4rem;box-shadow:0 6px 20px rgba(37,211,102,.45);z-index:990;transition:transform .3s;text-decoration:none}
.wa-fab:hover{transform:scale(1.1);color:#fff}
@media(max-width:767px){.wa-fab{bottom:76px}}