/* Reset */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root{
  --bg:#0b0b0f;
  --bg-elev:#12121a;
  --text:#e7e7ee;
  --muted:#a9a9b6;
  --brand:#7c5cff;
  --brand-2:#9a7dff;
  --field:#1a1a25;
  --border:#2a2a33;
}

html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', 'Roboto', system-ui, -apple-system, Segoe UI, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}

/* Header & nav */
header {
  background: var(--bg-elev);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 1000;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1080px;
  margin: 0 auto;
}

.brand { font-weight: 700; color: #fff; text-decoration: none; }
nav .menu {
  display: flex;
  gap: 1.25rem;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
  transition: color .25s ease;
}

nav a:hover,
nav a.active { color: var(--brand); }

/* Hamburger for mobile */
.hamburger { display: none; flex-direction: column; cursor: pointer; }
.hamburger span { height: 3px; width: 26px; background: #fff; margin: 4px 0; transition: .3s; }

/* Main layout */
main {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1.25rem;
  animation: fadeIn 1s ease;
}

h1, h2, h3 { color: #fff; margin-bottom: .75rem; letter-spacing: .2px; }
p { margin-bottom: 1rem; }

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.25rem;
  backdrop-filter: blur(4px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(12, 1fr);
}
.col-12 { grid-column: span 12; }
.col-6 { grid-column: span 6; }
.col-4 { grid-column: span 4; }

footer {
  background: var(--bg-elev);
  text-align: center;
  padding: 1rem;
  font-size: .95rem;
  color: var(--muted);
  margin-top: 3rem;
  border-top: 1px solid var(--border);
}

/* Buttons & forms */
button, .btn {
  display: inline-block;
  background: var(--brand);
  border: none;
  color: #fff;
  padding: .75rem 1.25rem;
  border-radius: 10px;
  cursor: pointer;
  font-size: 1rem;
  transition: background .25s ease, transform .15s ease;
  text-decoration: none;
}
button:hover, .btn:hover { background: var(--brand-2); transform: translateY(-1px); }

input, textarea {
  width: 100%;
  padding: .7rem .9rem;
  margin-top: .4rem;
  margin-bottom: 1rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--field);
  color: #fff;
}

/* Animations */
@keyframes fadeIn { from {opacity:0; transform:translateY(8px);} to {opacity:1; transform:translateY(0);} }
section { opacity: 0; transform: translateY(22px); transition: all .7s ease; }
section.visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 900px){
  .col-6 { grid-column: span 12; }
  .col-4 { grid-column: span 12; }
}
@media (max-width: 768px){
  nav .menu { display: none; position: absolute; top: 64px; right: 16px; left: 16px; padding: 1rem; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px; flex-direction: column; gap: 1rem; }
  nav .menu.active { display: flex; }
  .hamburger { display: flex; }
}