/* Основные стили из предоставленного файла с дополнениями */
:root{
  --bg:#f6f7f8;
  --card:#ffffff;
  --accent:#2d6a4f;
  --muted:#6b7280;
  --danger:#d9534f;
  --success:#28a745;
  --warning:#ffc107;
  --radius:10px;
  --gap:12px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background:var(--bg);
  color:#111827;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  display:flex;
  flex-direction:column;
  min-height:100%;
  padding:12px;
  gap:12px;
}

/* Header */
.site-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  background:linear-gradient(180deg,rgba(255,255,255,0.8),rgba(255,255,255,0.6));
  padding:10px 14px;
  border-radius:12px;
  box-shadow:0 1px 2px rgba(16,24,40,0.04);
}
.brand{display:flex;align-items:center;gap:10px}
.logo{font-size:20px;text-decoration:none}
.title{font-weight:700;text-decoration:none;color:#000}
.actions{display:flex;gap:8px}

/* Buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:8px 12px;
  border-radius:8px;
  text-decoration:none;
  color:var(--accent);
  background:transparent;
  border:1px solid rgba(45,106,79,0.12);
  font-weight:600;
  cursor:pointer;
  transition:all 0.2s ease;
}
.btn:hover{
  background:rgba(45,106,79,0.05);
  transform:translateY(-1px);
}
.btn.small{padding:6px 10px;font-size:14px}
.btn.tiny{padding:6px 8px;font-size:13px}
.btn.primary{
  background:var(--accent);
  color:white;
  border:0;
}
.btn.primary:hover{
  background:#1b4332;
  box-shadow:0 4px 12px rgba(45,106,79,0.2);
}
.btn.ghost{background:transparent;border:1px solid rgba(0,0,0,0.06)}
.btn.danger{
  background:var(--danger);
  color:white;
  border:0;
}
.btn.danger:hover{
  background:#c9302c;
}

/* Main content */
.main{
  flex:1;
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  padding-top:6px;
  gap:12px;
}
.welcome{
  width:100%;
  max-width:100%;
  background:var(--card);
  padding:18px;
  border-radius:12px;
  box-shadow:0 2px 8px rgba(0,0,0,0.04);
}
.sidebar{flex:0 0 280px}
@media (max-width:920px){
  .main{flex-direction:column;gap:12px}
  .main-left{order:0}
  .sidebar{order:1;width:100%}
  .welcome{max-width:100%}
}
.welcome h1{margin:0 0 8px 0}
.welcome h2{margin:0 0 12px 0;color:var(--accent)}

/* Cards grid */
.cards-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(280px, 1fr));
  gap:16px;
  margin-top:16px;
}
.course-card{
  background:white;
  border-radius:12px;
  overflow:hidden;
  border:1px solid rgba(16,24,40,0.06);
  transition:all 0.3s ease;
}
.course-card:hover{
  transform:translateY(-4px);
  box-shadow:0 12px 24px rgba(0,0,0,0.08);
  border-color:var(--accent);
}
.course-image{
  height:160px;
  background:linear-gradient(135deg, #2d6a4f, #40916c);
  display:flex;
  align-items:center;
  justify-content:center;
  color:white;
  font-size:48px;
}
.course-content{
  padding:16px;
}
.course-title{
  font-size:18px;
  font-weight:600;
  margin:0 0 8px 0;
  color:#111827;
}
.course-description{
  font-size:14px;
  color:var(--muted);
  margin:0 0 12px 0;
  line-height:1.5;
}
.course-meta{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-top:12px;
  padding-top:12px;
  border-top:1px solid rgba(16,24,40,0.03);
}
.course-price{
  display:flex;
  flex-direction:column;
}
.original-price{
  font-size:14px;
  color:var(--muted);
  text-decoration:line-through;
}
.discount-price{
  font-size:20px;
  font-weight:700;
  color:var(--accent);
}
.discount-badge{
  background:var(--danger);
  color:white;
  padding:2px 8px;
  border-radius:12px;
  font-size:12px;
  font-weight:600;
}

/* Service strip */
.service-strip{
  position:relative;
  margin-left:0;
  width:100%;
  border-top:4px solid var(--accent);
  border-radius:10px;
  padding:16px;
  background:white;
  margin-bottom:16px;
}
.service-strip h3{
  margin:0 0 12px 0;
  color:var(--accent);
}

/* Category filter */
.category-filter-wrap{padding:6px 0;}
.category-filter{position:relative;display:inline-block;}
.filter-toggle{
  display:flex;
  align-items:center;
  gap:8px;
  padding:6px 10px;
  border-radius:8px;
  border:1px solid rgba(45,106,79,0.12);
  background:linear-gradient(180deg,#fff,#f8faf8);
  color:var(--accent);
  font-weight:600;
  cursor:pointer;
  min-width:160px;
  font-size:13px;
  justify-content:space-between;
}
.filter-toggle .chev{opacity:0.8;transition:transform .28s ease;}
.category-filter[aria-expanded="true"] .filter-toggle .chev{transform:rotate(180deg);}
.filter-panel{
  position:absolute;
  left:0;
  right:0;
  margin-top:8px;
  background:var(--card);
  border-radius:10px;
  box-shadow:0 8px 30px rgba(2,6,23,0.12);
  border:1px solid rgba(16,24,40,0.06);
  overflow:auto;
  -webkit-overflow-scrolling:touch;
  max-height:0;
  opacity:0;
  transform-origin:top center;
  transform:scaleY(0.95);
  transition:opacity .22s ease, max-height .34s ease, transform .22s ease;
  z-index:80;
}
.category-filter[aria-expanded="true"] .filter-panel{
  max-height:360px;
  opacity:1;
  transform:scaleY(1);
}
.filter-item{
  padding:8px 10px;
  cursor:pointer;
  font-size:12px;
  border-bottom:1px solid rgba(16,24,40,0.03);
}
.filter-item:hover{background:linear-gradient(90deg,#f7f9f7,#fff);color:var(--accent);}
.filter-item:last-child{border-bottom:0}
.filter-item.active{
  background:var(--accent);
  color:white;
}

/* Forms */
.register-form,
.login-form,
.deposit-form{
  width:100%;
  max-width:420px;
  background:var(--card);
  padding:24px;
  border-radius:12px;
  box-shadow:0 6px 18px rgba(16,24,40,0.06);
  display:flex;
  flex-direction:column;
  gap:16px;
  margin:0 auto;
}
.form-title{
  margin:0 0 8px 0;
  text-align:center;
  color:var(--accent);
}
.form-group{
  display:flex;
  flex-direction:column;
  gap:6px;
}
.form-label{
  font-size:14px;
  font-weight:500;
  color:#111827;
}
.form-input{
  padding:12px;
  border-radius:8px;
  border:1px solid rgba(16,24,40,0.1);
  background:#fff;
  font-size:14px;
  transition:border-color 0.2s ease;
}
.form-input:focus{
  outline:none;
  border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(45,106,79,0.1);
}
.form-select{
  padding:12px;
  border-radius:8px;
  border:1px solid rgba(16,24,40,0.1);
  background:#fff;
  font-size:14px;
  cursor:pointer;
}
.radio-group{
  display:flex;
  gap:16px;
  margin-top:4px;
}
.radio-label{
  display:flex;
  align-items:center;
  gap:6px;
  cursor:pointer;
  font-size:14px;
}

/* Captcha */
.captcha-row{
  display:flex;
  gap:12px;
  align-items:center;
  margin:12px 0;
}
.captcha-box{
  flex:1;
  padding:12px;
  border-radius:8px;
  background:linear-gradient(180deg,#f8fafc,#ffffff);
  border:1px solid rgba(16,24,40,0.05);
  font-weight:700;
  text-align:center;
  font-size:20px;
  letter-spacing:2px;
  font-family:monospace;
}

/* Messages */
.alert{
  padding:12px 16px;
  border-radius:8px;
  margin:12px 0;
  font-size:14px;
}
.alert-success{
  background:rgba(40,167,69,0.1);
  color:#155724;
  border:1px solid rgba(40,167,69,0.2);
}
.alert-error{
  background:rgba(217,83,79,0.1);
  color:#721c24;
  border:1px solid rgba(217,83,79,0.2);
}
.alert-info{
  background:rgba(23,162,184,0.1);
  color:#0c5460;
  border:1px solid rgba(23,162,184,0.2);
}

/* Tables */
.table{
  width:100%;
  border-collapse:collapse;
  background:white;
  border-radius:10px;
  overflow:hidden;
  box-shadow:0 2px 8px rgba(0,0,0,0.04);
}
.table th{
  background:var(--accent);
  color:white;
  padding:12px 16px;
  text-align:left;
  font-weight:600;
  font-size:14px;
}
.table td{
  padding:12px 16px;
  border-bottom:1px solid rgba(16,24,40,0.03);
  font-size:14px;
}
.table tr:hover{
  background:rgba(45,106,79,0.03);
}

/* Status badges */
.status-badge{
  padding:4px 10px;
  border-radius:20px;
  font-size:12px;
  font-weight:600;
  display:inline-block;
}
.status-pending{
  background:rgba(255,193,7,0.1);
  color:#856404;
}
.status-completed{
  background:rgba(40,167,69,0.1);
  color:#155724;
}
.status-failed{
  background:rgba(217,83,79,0.1);
  color:#721c24;
}

/* Footer */
.footer{
  display:flex;
  justify-content:center;
  align-items:center;
  padding:16px 0;
  color:var(--muted);
  font-size:14px;
  border-top:1px solid rgba(16,24,40,0.03);
  margin-top:24px;
}
.footer-content{
  text-align:center;
}

/* Modal windows */
.modal{
  position:fixed;
  inset:0;
  display:none;
  align-items:center;
  justify-content:center;
  z-index:1000;
  padding:20px;
}
.modal[aria-hidden="false"]{
  display:flex;
}
.modal-backdrop{
  position:absolute;
  inset:0;
  background:rgba(18,18,18,0.75);
  backdrop-filter:blur(2px);
}
.modal-panel{
  position:relative;
  z-index:1001;
  background:var(--card);
  padding:24px;
  border-radius:12px;
  max-width:500px;
  width:100%;
  max-height:90vh;
  overflow:auto;
  box-shadow:0 20px 60px rgba(2,6,23,0.3);
}
.modal-close{
  position:absolute;
  top:16px;
  right:16px;
  background:none;
  border:none;
  font-size:20px;
  cursor:pointer;
  color:var(--muted);
}
.modal-close:hover{
  color:#111827;
}

/* Sidebar blocks */
.sidebar-block{
  background:white;
  border-radius:12px;
  padding:16px;
  margin-bottom:16px;
  border:1px solid rgba(16,24,40,0.03);
}
.sidebar-title{
  margin:0 0 12px 0;
  font-size:16px;
  font-weight:600;
  color:var(--accent);
}

/* Responsive */
@media (max-width:768px){
  .cards-grid{
    grid-template-columns:1fr;
  }
  .modal-panel{
    padding:16px;
    max-width:95%;
  }
  .sidebar{
    flex:0 0 auto;
    width:100%;
  }
}