/* ═══════════════════════════════════════════════════════════════
   Calculedique — Enterprise Design System
   ═══════════════════════════════════════════════════════════════ */

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}

:root{
  --bg:#050505;
  --surface:#0c0c0c;
  --surface-2:#131313;
  --surface-3:#1a1a1a;
  --border:rgba(180,77,219,.08);
  --border-hover:rgba(180,77,219,.2);
  --accent:#d946ef;
  --accent-soft:rgba(217,70,239,.06);
  --accent-glow:rgba(217,70,239,.15);
  --cta:#00d4ff;
  --cta-hover:#33e0ff;
  --white:#f9fafb;
  --gray-100:#f3f4f6;
  --gray-300:#d1d5db;
  --gray-400:#9ca3af;
  --gray-500:#6b7280;
  --text:#e5e7eb;
  --radius:16px;
  --radius-sm:10px;
  --radius-xs:6px;
  --shadow-sm:0 2px 8px rgba(0,0,0,.3);
  --shadow-md:0 8px 24px rgba(0,0,0,.4);
  --shadow-lg:0 16px 48px rgba(0,0,0,.5);
  --transition:all .25s cubic-bezier(.4,0,.2,1);
  --max-w:1120px;
  --font:-apple-system,BlinkMacSystemFont,'Inter',system-ui,sans-serif;
}

body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--white);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.6;
}

/* ─── Typography ─── */
h1,h2,h3,h4{font-weight:700;letter-spacing:-.02em;line-height:1.2}
h1{font-size:clamp(2.5rem,5.5vw,3.8rem);font-weight:800}
h2{font-size:clamp(1.6rem,3vw,2.2rem)}
h3{font-size:1.1rem}
p{color:var(--gray-400);line-height:1.75;font-size:.95rem}

/* ─── Layout ─── */
.container{max-width:var(--max-w);margin:0 auto;padding:0 2rem}
section{position:relative;z-index:1}

/* ─── Navigation ─── */
nav{position:fixed;top:0;width:100%;z-index:1000;backdrop-filter:blur(20px) saturate(1.4);background:linear-gradient(90deg,rgba(217,70,239,.18),rgba(0,212,255,.12));border-bottom:1px solid rgba(217,70,239,.15)}
nav .container{display:flex;align-items:center;justify-content:space-between;padding:1rem 2rem}
.logo{font-weight:800;font-size:1.15rem;color:var(--white);text-decoration:none;letter-spacing:-.03em}
.logo em{font-style:normal;color:var(--accent)}
nav ul{list-style:none;display:flex;gap:2rem;align-items:center}
nav a{color:var(--gray-400);text-decoration:none;font-weight:500;font-size:.85rem;transition:var(--transition)}
nav a:hover{color:var(--white)}
.nav-cta{background:var(--accent);color:var(--white);padding:.5rem 1.2rem;border-radius:var(--radius-xs);font-weight:700;font-size:.8rem;letter-spacing:.02em}
.nav-cta:hover{background:#c96eef;color:var(--white)}
.menu-toggle{display:none;background:none;border:none;color:var(--white);font-size:1.3rem;cursor:pointer}

/* ─── Buttons ─── */
.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.85rem 2rem;border-radius:var(--radius-sm);font-weight:600;font-size:.9rem;text-decoration:none;transition:var(--transition);cursor:pointer;border:none}
.btn-primary{background:var(--cta);color:var(--bg);box-shadow:0 4px 20px rgba(0,212,255,.25)}
.btn-primary:hover{background:var(--cta-hover);transform:translateY(-2px);box-shadow:0 8px 30px rgba(0,212,255,.35)}
.btn-accent{background:var(--accent);color:var(--white);font-weight:700}
.btn-accent:hover{background:#c96eef;transform:translateY(-2px)}
.btn-ghost{color:var(--gray-400);border:1px solid var(--border);background:transparent}
.btn-ghost:hover{border-color:var(--border-hover);color:var(--white);background:var(--surface)}

/* ─── Cards ─── */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:2rem;transition:var(--transition)}
.card:hover{border-color:var(--border-hover);transform:translateY(-3px);box-shadow:var(--shadow-md)}

/* ─── Section Headers ─── */
.section-header{text-align:center;margin-bottom:3.5rem}
.section-header h2{margin-bottom:.6rem}
.section-header p{color:var(--gray-500);font-size:.95rem;max-width:500px;margin:0 auto}

/* ─── Badge / Label ─── */
.badge{display:inline-flex;align-items:center;gap:.4rem;background:var(--accent-soft);border:1px solid var(--accent-glow);color:var(--accent);font-weight:600;font-size:.75rem;padding:.4rem 1rem;border-radius:50px;letter-spacing:.04em;text-transform:uppercase}

/* ─── Hero ─── */
.hero{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:8rem 2rem 6rem}
.hero-content{max-width:680px;text-align:center}
.hero-content h1 span{display:block;color:var(--accent)}
.hero-content p{max-width:480px;margin:1.5rem auto 2.5rem;font-size:1.05rem}
.hero-buttons{display:flex;gap:.75rem;justify-content:center;flex-wrap:wrap}

/* ─── Page Header (inner pages) ─── */
.page-header{padding:9rem 2rem 4rem;text-align:center}
.page-header h1{margin-bottom:.6rem}
.page-header p{color:var(--gray-500);font-size:1.05rem}

/* ─── Grid Layouts ─── */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:1.5rem}

/* ─── Footer ─── */
footer{position:relative;z-index:1;text-align:center;padding:3rem 2rem;border-top:1px solid var(--border)}
footer p{color:var(--gray-500);font-size:.8rem}
.footer-brand{display:flex;flex-direction:column;align-items:center;gap:.6rem;margin-top:1.2rem}
.footer-brand a{color:var(--white);text-decoration:none;font-weight:600;font-size:.78rem;transition:var(--transition)}
.footer-brand a:hover{opacity:.7}
.footer-brand img{height:36px;opacity:.8;transition:var(--transition)}
.footer-brand img:hover{opacity:1;transform:scale(1.05)}

/* ─── Math Background ─── */
.math-bg{position:fixed;inset:0;z-index:0;opacity:.03;pointer-events:none;font-family:'Courier New',monospace;font-size:.8rem;color:var(--white);line-height:3;padding:3rem;word-wrap:break-word;overflow:hidden;animation:drift 90s linear infinite}
@keyframes drift{0%{transform:translateY(0)}100%{transform:translateY(-50%)}}

/* ─── Animations ─── */
@keyframes fadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}
.fade-up{animation:fadeUp .6s ease both}

/* ─── WhatsApp Floating Button ─── */
.whatsapp-fab{position:fixed;bottom:2rem;right:2rem;width:56px;height:56px;border-radius:50%;display:flex;align-items:center;justify-content:center;z-index:9999;transition:transform .2s,box-shadow .2s,opacity .6s,background 1.5s;animation:wpp-color 8s infinite alternate,wpp-show 25s infinite;animation-delay:3s;opacity:0;pointer-events:none}
.whatsapp-fab:hover{transform:scale(1.1);animation-play-state:paused;opacity:1!important;pointer-events:auto!important}
.whatsapp-fab svg{width:28px;height:28px}
@keyframes wpp-color{0%{background:#39ff14;box-shadow:0 4px 12px rgba(57,255,20,.4)}100%{background:#00d4ff;box-shadow:0 4px 12px rgba(0,212,255,.4)}}
@keyframes wpp-show{0%,28%{opacity:1;pointer-events:auto}32%,100%{opacity:0;pointer-events:none}}

/* ─── Scroll to top ─── */
.scroll-top{position:fixed;bottom:2rem;right:2rem;z-index:99;background:var(--surface);border:1px solid var(--border);color:var(--accent);width:44px;height:44px;border-radius:50%;font-size:1rem;cursor:pointer;transition:var(--transition);display:flex;align-items:center;justify-content:center}
.scroll-top:hover{background:var(--accent);color:var(--bg);border-color:var(--accent)}

/* ─── Responsive ─── */
@media(max-width:1024px){.grid-3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:768px){
  nav ul{position:fixed;top:0;right:-100%;width:75%;height:100vh;background:var(--bg);flex-direction:column;padding:5rem 2rem;gap:1.5rem;transition:right .3s;border-left:1px solid var(--border)}
  nav ul.open{right:0}
  .menu-toggle{display:block}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .hero{padding:7rem 1.5rem 4rem}
  .page-header{padding:7rem 1.5rem 3rem}
}