:root{
  --bg:#f6f8fb;
  --card:#ffffff;
  --accent:#0b74de;
  --dark:#222;
  --muted:#6b7280;
  --radius:12px;
  --container:1100px;
  --gap:18px;
  --shadow: 0 8px 24px rgba(15,23,42,0.06);
  --fw-regular: 400;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: "Segoe UI", Tahoma, Arial, sans-serif;
  background:var(--bg);
  color:var(--dark);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.55;
  direction: rtl;
}

a {
    text-decoration: none;
}

/* container */
.container{max-width:var(--container);margin:0 auto;padding:28px}

/* header */
.site-header{background:linear-gradient(90deg,#fff, #fbfdff);position:sticky;top:0;z-index:40;box-shadow:0 6px 20px rgba(12,12,14,0.03)}
.header-inner{display:flex;align-items:center;gap:16px}
.logo{font-weight:700;font-size:1.15rem;color:var(--accent);text-decoration:none}
.nav{margin-left:auto}
#burger{display:none;background:none;border:0;font-size:1.2rem}
.nav-list{display:flex;gap:12px;list-style:none;margin:0;padding:0}
.nav-list a{display:inline-block;padding:10px 12px;text-decoration:none;color:var(--muted);border-radius:10px}
.nav-list a:hover{background:rgba(11,116,222,0.08);color:var(--accent)}

/* hero */
.hero{padding:64px 0;background:linear-gradient(180deg, rgba(11,116,222,0.06), transparent);border-bottom:1px solid rgba(0,0,0,0.03)}
.hero-inner{display:flex;flex-direction:column;gap:12px}
.hero h1{margin:0;font-size:2rem}
.hero p{margin:0;color:var(--muted)}

/* buttons */
.btn{
  background:var(--accent);
  color:white;
  padding:10px 14px;
  border-radius:10px;
  border:0;
  cursor:pointer;
  transition:transform .15s ease, box-shadow .15s;
  box-shadow: var(--shadow);
}
.btn:hover{transform:translateY(-3px)}
.btn.ghost{background:transparent;color:var(--accent);box-shadow:none;border:1px solid rgba(11,116,222,0.12)}
.btn.small{padding:6px 8px;font-size:.9rem}
.cta{font-weight:700;text-align: center;}

/* sections */
.section{padding:44px 0}
.section.alt{background:transparent}
.section-title{margin:0 0 18px 0;font-size:1.25rem}

/* cards grid */
.cards{display:flex;gap:16px;flex-wrap:wrap}
.teacher-card{
  background:var(--card);border-radius:var(--radius);padding:16px;display:flex;gap:12px;align-items:center;width:320px;
  box-shadow:var(--shadow);transform:translateY(0);transition:transform .25s ease, box-shadow .25s ease;cursor:default;
}
.teacher-card:focus{outline:3px solid rgba(11,116,222,0.12)}
.teacher-card:hover{transform:translateY(-8px)}
.avatar{width:88px;height:88px;border-radius:10px;object-fit:cover}
.card-body h3{margin:0 0 6px 0}
.card-actions{margin-top:10px;display:flex;gap:8px}

/* grid for courses */
.grid{display:grid;gap:16px}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.course-card{padding:18px;border-radius:12px;background:linear-gradient(180deg,#fff,#fbfdff);box-shadow:var(--shadow)}

/* lessons list */
.lessons-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px}
.lesson{background:var(--card);padding:12px;border-radius:10px;display:flex;justify-content:space-between;align-items:center;box-shadow:var(--shadow)}

/* schedule table */
.table-wrap{overflow:auto;border-radius:12px;background:var(--card);padding:12px;box-shadow:var(--shadow)}
.schedule-table{width:100%;border-collapse:collapse}
.schedule-table th, .schedule-table td{padding:10px;border-bottom:1px solid #f1f5f9;text-align:center}
.schedule-table thead th{background:rgba(11,116,222,0.06);font-weight:600}

/* footer */
.site-footer{padding:22px 0;background:transparent;border-top:1px solid rgba(0,0,0,0.03)}
.footer-inner{display:flex;justify-content:space-between;align-items:center}

/* modal */
.modal{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(11,16,24,0.4);opacity:0;pointer-events:none;transition:opacity .2s}
.modal[aria-hidden="false"]{opacity:1;pointer-events:auto}
.modal-content{background:var(--card);padding:20px;border-radius:12px;width:360px;box-shadow:0 30px 80px rgba(15,23,42,0.2);transform:translateY(20px);transition:transform .25s}
.modal[aria-hidden="false"] .modal-content{transform:none}
.modal-close{position:absolute;right:18px;top:18px;border:0;background:transparent;font-size:1rem}

/* form */
.form-row{margin-bottom:12px;display:flex;flex-direction:column;gap:6px}
.form-row input{padding:10px;border-radius:8px;border:1px solid #e6e9ef}
.error{color:#d9534f;font-size:.85rem;min-height:18px}

/* responsive */
@media (max-width:900px){
  .nav-list{display:none;position:absolute;right:16px;top:64px;background:var(--card);padding:12px;border-radius:10px;box-shadow:var(--shadow);flex-direction:column}
  #burger{display:inline-block}
  .header-inner{gap:8px}
  .grid-3{grid-template-columns:1fr}
  .container{padding:16px}
}