:root{
  --primary:#1b2a6b;--primary-2:#3950a8;--secondary:#39c0c8;
  --bg:#f7f9fc;--card:#ffffff;--text:#0f172a;--muted:#5b6b85;--border:#e2e8f0;
  --gradient:linear-gradient(135deg,#1b2a6b 0%,#3950a8 50%,#39c0c8 100%);
  --shadow:0 12px 40px -12px rgba(27,42,107,.35);
  --radius:14px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Segoe UI',system-ui,-apple-system,Roboto,Helvetica,Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.6}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{max-width:1140px;margin:0 auto;padding:0 20px}

/* Nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 0}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--primary)}
.brand img{height:42px;width:42px;border-radius:8px;object-fit:cover}
.brand small{display:block;font-weight:500;color:var(--muted);font-size:11px;letter-spacing:.1em;text-transform:uppercase}
.nav-links{display:flex;gap:6px;align-items:center}
.nav-links a{padding:8px 12px;border-radius:8px;font-weight:500;color:var(--text)}
.nav-links a:hover,.nav-links a.active{background:rgba(57,80,168,.1);color:var(--primary)}
.cta{background:var(--gradient);color:#fff !important;padding:10px 18px !important;border-radius:10px;box-shadow:var(--shadow)}
.cta:hover{opacity:.95}
.burger{display:none;background:none;border:0;font-size:26px;color:var(--primary);cursor:pointer}
@media(max-width:880px){
  .nav-links{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;padding:14px 20px;border-bottom:1px solid var(--border);gap:0}
  .nav-links.open{display:flex}
  .nav-links a{padding:12px;border-radius:8px}
  .burger{display:block}
}

/* Hero */
.hero{background:var(--gradient);color:#fff;padding:80px 0;position:relative;overflow:hidden}
.hero h1{font-size:clamp(32px,5vw,56px);font-weight:800;line-height:1.1;margin-bottom:18px}
.hero p{font-size:18px;opacity:.92;max-width:620px;margin-bottom:28px}
.hero-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:40px;align-items:center}
.hero-grid img{border-radius:20px;box-shadow:0 30px 60px -20px rgba(0,0,0,.4)}
@media(max-width:860px){.hero-grid{grid-template-columns:1fr}}
.btn{display:inline-block;padding:13px 26px;border-radius:10px;font-weight:600;cursor:pointer;border:0;font-size:15px}
.btn-light{background:#fff;color:var(--primary)}
.btn-ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.6);margin-left:10px}
.btn-primary{background:var(--gradient);color:#fff;box-shadow:var(--shadow)}

/* Sections */
section.block{padding:70px 0}
.eyebrow{color:var(--secondary);font-weight:700;letter-spacing:.15em;text-transform:uppercase;font-size:12px;margin-bottom:10px}
h2.title{font-size:clamp(26px,3.5vw,40px);color:var(--primary);font-weight:800;margin-bottom:14px}
.lead{color:var(--muted);max-width:680px;margin-bottom:36px;font-size:17px}

/* Cards */
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
@media(max-width:860px){.grid-3,.grid-2{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:26px;transition:.25s;box-shadow:0 2px 6px rgba(15,23,42,.04)}
.card:hover{transform:translateY(-4px);border-color:var(--secondary);box-shadow:var(--shadow)}
.card .icon{width:48px;height:48px;border-radius:12px;background:var(--gradient);color:#fff;display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px;font-weight:700}
.card h3{color:var(--primary);font-size:20px;margin-bottom:8px}
.card p{color:var(--muted);font-size:15px}
.tag{display:inline-block;background:rgba(57,192,200,.15);color:#0c7a82;padding:4px 12px;border-radius:999px;font-size:12px;font-weight:600;margin-bottom:10px}

/* Course card */
.course-list{display:grid;gap:18px}
.course{display:grid;grid-template-columns:80px 1fr auto;gap:20px;align-items:center;background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px;transition:.2s}
.course:hover{border-color:var(--primary);box-shadow:var(--shadow)}
.course .num{font-size:36px;font-weight:800;color:transparent;background:var(--gradient);-webkit-background-clip:text;background-clip:text}
.course h3{color:var(--primary);margin-bottom:4px;font-size:19px}
.course p{color:var(--muted);font-size:14px}
.duration{background:var(--primary);color:#fff;padding:6px 14px;border-radius:999px;font-size:12px;font-weight:600;white-space:nowrap}
@media(max-width:680px){.course{grid-template-columns:1fr;text-align:left}.course .num{font-size:28px}}

/* Reviews */
.review{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:26px}
.review .stars{color:#f59e0b;margin-bottom:10px;font-size:18px}
.review p{font-style:italic;color:var(--text);margin-bottom:16px}
.review .who{display:flex;align-items:center;gap:12px}
.avatar{width:42px;height:42px;border-radius:50%;background:var(--gradient);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
.review .name{font-weight:700;color:var(--primary);font-size:14px}
.review .role{color:var(--muted);font-size:12px}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:36px}
@media(max-width:860px){.contact-grid{grid-template-columns:1fr}}
.contact-item{display:flex;gap:14px;padding:16px;background:#fff;border:1px solid var(--border);border-radius:12px;margin-bottom:14px;transition:.2s}
.contact-item:hover{border-color:var(--secondary)}
.contact-item .ico{width:42px;height:42px;border-radius:10px;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:18px}
.contact-item .lbl{font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted)}
.contact-item .val{font-weight:600;color:var(--text)}
form{background:#fff;padding:28px;border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow)}
form label{display:block;font-size:14px;font-weight:600;margin-bottom:6px;margin-top:14px}
form label:first-of-type{margin-top:0}
form input,form textarea{width:100%;padding:11px 14px;border:1px solid var(--border);border-radius:8px;font-family:inherit;font-size:15px;background:#fff}
form input:focus,form textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(27,42,107,.15)}
.sent{color:#0c7a82;font-weight:600;margin-top:12px;display:none}
.sent.show{display:block}

/* Footer */
footer{background:#0b1442;color:#cbd5e1;padding:50px 0 24px;margin-top:40px}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px;margin-bottom:30px}
@media(max-width:760px){.foot-grid{grid-template-columns:1fr}}
footer h4{color:#fff;margin-bottom:14px;font-size:15px}
footer ul{list-style:none}
footer li{margin-bottom:8px}
footer a:hover{color:var(--secondary)}
.copy{border-top:1px solid rgba(255,255,255,.1);padding-top:20px;text-align:center;font-size:13px;color:#94a3b8}

/* Tutorial highlight */
.tutor-hero{display:grid;grid-template-columns:1fr 1.2fr;gap:36px;align-items:center;background:#fff;border-radius:20px;padding:36px;border:1px solid var(--border);box-shadow:var(--shadow)}
.tutor-hero img{border-radius:16px}
@media(max-width:760px){.tutor-hero{grid-template-columns:1fr}}

/* About */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:30px}
@media(max-width:680px){.stats{grid-template-columns:repeat(2,1fr)}}
.stat{background:#fff;border:1px solid var(--border);border-radius:12px;padding:22px;text-align:center}
.stat .num{font-size:32px;font-weight:800;background:var(--gradient);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .lbl{color:var(--muted);font-size:13px;margin-top:4px}

ul.feat{list-style:none;margin-top:14px}
ul.feat li{padding:8px 0 8px 28px;position:relative;color:var(--text)}
ul.feat li:before{content:"✓";position:absolute;left:0;color:var(--secondary);font-weight:800;font-size:18px}

/* Improved Select Dropdown */
.select-wrapper {
  position: relative;
  margin-bottom: 20px;
}

.select-wrapper select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  background: #fff;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  color: var(--text);
}

.select-wrapper select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(27, 42, 107, 0.15);
}

/* Dropdown Arrow */
.select-wrapper::after {
  content: '▼';
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 12px;
  color: var(--muted);
  pointer-events: none;
}