/* =========================
   RESET
========================= */

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

/* =========================
   ROOT
========================= */

:root{
  --bg-main:#0f172a;
  --bg-soft:#111827;
  --card-bg:#ffffff;
  --text-main:#0f172a;
  --text-light:#f8fafc;
  --text-muted:#64748b;
  --primary:#38bdf8;
  --primary-dark:#0284c7;
  --border:#e2e8f0;
}

/* =========================
   BODY
========================= */

html{
  scroll-behavior:smooth;
}

body{
  font-family:Arial, Helvetica, sans-serif;
  background:#f1f5f9;
  color:var(--text-main);
  line-height:1.6;
}

/* =========================
   HEADER
========================= */

.site-header{
  min-height:100vh;

  background:
  radial-gradient(circle at top left,
  rgba(56,189,248,0.25),
  transparent 35%),

  linear-gradient(
  135deg,
  #020617,
  #0f172a 60%,
  #111827);

  color:white;
  padding:24px;
}

/* =========================
   NAVBAR
========================= */

.navbar{
  width:min(1120px,100%);
  margin:0 auto;

  display:flex;
  justify-content:space-between;
  align-items:center;

  padding:18px 24px;

  background:rgba(15,23,42,0.7);

  border:1px solid rgba(255,255,255,0.08);

  border-radius:18px;

  backdrop-filter:blur(14px);

  position:sticky;
  top:16px;
}

.logo{
  text-decoration:none;
  color:white;

  font-size:1.4rem;
  font-weight:800;
}

.logo span{
  color:var(--primary);
}

.nav-links{
  list-style:none;
  display:flex;
  gap:20px;
}

.nav-links a{
  text-decoration:none;
  color:#cbd5e1;
  font-weight:600;
  transition:0.25s;
}

.nav-links a:hover,
.nav-links a.active{
  color:white;
}

/* =========================
   HERO
========================= */

.hero{
  width:min(900px,100%);
  margin:120px auto 0;
  text-align:center;
}

.badge{
  display:inline-block;

  padding:8px 16px;
  margin-bottom:24px;

  border-radius:999px;

  background:rgba(56,189,248,0.12);

  border:1px solid rgba(56,189,248,0.25);

  color:#bae6fd;

  font-size:0.9rem;
  font-weight:700;
}

.hero h1{
  font-size:clamp(2.5rem,7vw,5rem);
  line-height:1.05;
  letter-spacing:-0.06em;
}

.hero-description{
  max-width:700px;

  margin:28px auto 0;

  color:#cbd5e1;

  font-size:1.1rem;
}

/* =========================
   BUTTONS
========================= */

.hero-actions{
  margin-top:38px;

  display:flex;
  justify-content:center;
  gap:16px;

  flex-wrap:wrap;
}

.btn{
  text-decoration:none;

  padding:14px 24px;

  border-radius:999px;

  font-weight:700;

  transition:0.25s;
}

.btn:hover{
  transform:translateY(-3px);
}

.btn-primary{
  background:var(--primary);
  color:#082f49;
}

.btn-primary:hover{
  background:#7dd3fc;
}

.btn-secondary{
  border:1px solid rgba(255,255,255,0.2);
  color:white;
}

.btn-secondary:hover{
  background:rgba(255,255,255,0.08);
}

/* =========================
   MAIN
========================= */

main{
  padding:80px 24px;
}

/* =========================
   INTRO
========================= */

.intro-section,
.category-section,
.roadmap-section{
  width:min(1120px,100%);
  margin:0 auto;
}

.intro-card,
.roadmap-card{
  background:white;

  border-radius:28px;

  padding:40px;

  box-shadow:
  0 18px 40px rgba(15,23,42,0.08);
}

.intro-card h2,
.roadmap-card h2,
.section-heading h2{
  font-size:2.5rem;
  line-height:1.1;
}

.intro-card p,
.section-heading p,
.roadmap-card li{
  color:var(--text-muted);
}

.intro-card p{
  margin-top:18px;
}

/* =========================
   CATEGORY
========================= */

.category-section{
  margin-top:90px;
}

.section-heading{
  margin-bottom:36px;
}

.section-label{
  color:var(--primary-dark);

  font-weight:800;

  margin-bottom:10px;
}

.section-heading p{
  margin-top:14px;
}

/* =========================
   MENU GRID
========================= */

.menu{
  display:grid;

  grid-template-columns:
  repeat(4,1fr);

  gap:22px;
}

.card{
  min-height:260px;

  padding:26px;

  border-radius:26px;

  background:white;

  text-decoration:none;
  color:var(--text-main);

  box-shadow:
  0 10px 24px rgba(15,23,42,0.08);

  transition:0.25s;
}

.card:hover{
  transform:translateY(-8px);
}

.card-icon{
  display:inline-flex;

  align-items:center;
  justify-content:center;

  width:54px;
  height:54px;

  margin-bottom:20px;

  border-radius:18px;

  background:#f1f5f9;

  font-size:1.6rem;
}

.card h3{
  margin-bottom:12px;
}

.card p{
  color:var(--text-muted);
}

/* =========================
   ROADMAP
========================= */

.roadmap-section{
  margin-top:90px;
}

.roadmap-card ul{
  margin-top:20px;
  padding-left:20px;
}

.roadmap-card li{
  margin-bottom:10px;
}

/* =========================
   FOOTER
========================= */

.footer{
  padding:28px;
  text-align:center;

  background:#020617;
  color:#94a3b8;
}

/* =========================
   RESPONSIVE
========================= */

@media(max-width:900px){

  .menu{
    grid-template-columns:
    repeat(2,1fr);
  }

}

@media(max-width:640px){

  .navbar{
    flex-direction:column;
    align-items:flex-start;
    gap:16px;
  }

  .nav-links{
    flex-wrap:wrap;
  }

  .hero{
    margin-top:80px;
    text-align:left;
  }

  .hero-actions{
    justify-content:flex-start;
  }

  .btn{
    width:100%;
    text-align:center;
  }

  .menu{
    grid-template-columns:1fr;
  }

  .intro-card,
  .roadmap-card{
    padding:28px;
  }

}

.contact-section {
  width: min(1120px, 100%);
  margin: 90px auto 0;
}

.contact-card {
  padding: clamp(28px, 5vw, 48px);
  border-radius: 30px;
  background: #ffffff;
  border: 1px solid var(--border);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
}

.contact-card h2 {
  max-width: 760px;
  margin-top: 10px;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.04em;
}

.contact-description {
  max-width: 680px;
  margin-top: 16px;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.contact-form {
  margin-top: 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.form-group {
  display: grid;
  gap: 8px;
}

.form-group.full {
  grid-column: 1 / -1;
}

.form-group label {
  font-weight: 800;
  color: var(--text-main);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 15px 16px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: #f8fafc;
  color: var(--text-main);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1rem;
  outline: none;
}

.contact-form textarea {
  resize: vertical;
  min-height: 150px;
}

.contact-form input:focus,
.contact-form textarea:focus {
  background: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.16);
}

.contact-button {
  grid-column: 1 / -1;
  justify-self: start;
  padding: 15px 26px;
  border: none;
  border-radius: 999px;
  background: var(--primary);
  color: #082f49;
  font-size: 1rem;
  font-weight: 900;
  cursor: pointer;
  transition: 0.25s;
}

.contact-button:hover {
  transform: translateY(-3px);
  background: #7dd3fc;
}

@media (max-width: 640px) {
  .contact-form {
    grid-template-columns: 1fr;
  }

  .contact-button {
    width: 100%;
  }
}