* { font-family: 'Cairo', sans-serif; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; min-height: 100vh; }
html.dark body { background: #111827; }
html:not(.dark) body { background: #fff; }

/* Subjects catalog */
.subjects-catalog {
	width: min(1100px, 92vw);
	margin: 0 auto 4.5rem;
	padding: 1.1rem;
	border-radius: 24px;
	border: 1px solid rgba(99, 102, 241, 0.2);
	background: linear-gradient(140deg, rgba(30, 41, 59, 0.58), rgba(17, 24, 39, 0.66));
	backdrop-filter: blur(6px);
}

.subjects-catalog-head {
	text-align: center;
	margin-bottom: 1rem;
}

.subjects-catalog-kicker {
	margin: 0;
	color: #818cf8;
	font-size: 0.82rem;
	letter-spacing: 0.08em;
	font-weight: 700;
}

.subjects-catalog-head h2 {
	margin: 0.4rem 0 0;
	font-size: clamp(1.3rem, 2.6vw, 2rem);
	color: #f8fafc;
}

.subjects-catalog-status {
	margin: 0.5rem 0 0;
	color: rgba(226, 232, 240, 0.82);
	font-size: 0.95rem;
}

.subjects-catalog-grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
	gap: 0.8rem;
}

.subject-catalog-card {
	display: block;
	text-decoration: none;
	color: #e2e8f0;
	border-radius: 20px;
	border: 1px solid rgba(255, 255, 255, 0.05);
	padding: 1.25rem;
	background: linear-gradient(145deg, rgba(30, 41, 59, 0.6), rgba(15, 23, 42, 0.8));
	backdrop-filter: blur(12px);
	transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
	position: relative;
	overflow: hidden;
}

.subject-catalog-card::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	height: 3px;
	background: var(--subject-accent, #6366f1);
	opacity: 0.6;
	transition: opacity 0.3s ease;
}

.subject-catalog-card:hover {
	transform: translateY(-5px);
	border-color: rgba(255, 255, 255, 0.15);
	box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4), 0 0 20px color-mix(in srgb, var(--subject-accent) 25%, transparent);
}

.subject-catalog-card:hover::before {
	opacity: 1;
	height: 4px;
}

.subject-catalog-card-head {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 0.5rem;
	margin-bottom: 0.8rem;
}

.subject-catalog-title {
	margin: 0;
	font-size: 1.15rem;
	font-weight: 700;
	color: #f8fafc;
	letter-spacing: -0.01em;
}

.subject-catalog-icon {
	font-size: 1.6rem;
	background: color-mix(in srgb, var(--subject-accent) 15%, transparent);
	padding: 0.7rem;
	border-radius: 14px;
	display: inline-flex;
	align-items: center;
	justify-content: center;
}

.subject-catalog-description {
	margin: 0;
	font-size: 0.9rem;
	color: #94a3b8;
	line-height: 1.6;
}

.subject-catalog-meta {
	margin-top: 1rem;
	display: flex;
	justify-content: space-between;
	align-items: center;
	font-size: 0.8rem;
	font-weight: 600;
	color: #64748b;
	padding-top: 0.8rem;
	border-top: 1px solid rgba(255, 255, 255, 0.05);
}

@media (max-width: 640px) {
	.subjects-catalog {
		margin-bottom: 3.2rem;
		padding: 0.9rem;
	}

	.subjects-catalog-grid {
		grid-template-columns: 1fr;
	}
}

/* Popup styles */
.popup-overlay { display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.75);z-index:10000;justify-content:center;align-items:center;backdrop-filter:blur(6px) }
.popup-overlay.active { display:flex }
.popup-box { background:rgba(26,26,46,0.97);border:1px solid rgba(99,102,241,0.3);border-radius:24px;padding:35px 30px;max-width:520px;width:92%;max-height:88vh;overflow-y:auto;position:relative;box-shadow:0 25px 80px rgba(0,0,0,0.5);animation:popupSlideUp .35s ease }
@keyframes popupSlideUp { from{transform:translateY(40px);opacity:0} to{transform:translateY(0);opacity:1} }
.popup-close { position:absolute;top:12px;left:12px;background:none;border:none;color:rgba(255,255,255,0.5);font-size:1.8rem;cursor:pointer;width:36px;height:36px;display:flex;align-items:center;justify-content:center }
.popup-close:hover { color:#ff6b6b }
.popup-tabs { display:flex;gap:8px;margin-bottom:25px;background:rgba(0,0,0,0.2);border-radius:12px;padding:5px }
.popup-tab { flex:1;padding:10px;border:none;border-radius:8px;background:transparent;color:rgba(255,255,255,0.5);font-family:'Cairo',sans-serif;font-size:.9rem;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:6px }
.popup-tab.active { background:rgba(255,255,255,0.1);color:white }
.popup-header { text-align:center;margin-bottom:25px }
.popup-icon { width:70px;height:70px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 15px;font-size:1.8rem;color:white }
.popup-header h2 { font-size:1.5rem;background:linear-gradient(90deg,#6366f1,#a855f7);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:6px }
.popup-header p { color:rgba(255,255,255,0.55);font-size:.9rem }
.popup-form { display:flex;flex-direction:column;gap:16px }
.popup-field label { display:flex;align-items:center;gap:6px;margin-bottom:6px;font-weight:600;color:#818cf8;font-size:.88rem }
.popup-field input,.popup-field textarea,.popup-field select { width:100%;padding:12px 15px;border:2px solid rgba(99,102,241,0.2);border-radius:10px;background:rgba(0,0,0,0.3);color:#fff;font-family:'Cairo',sans-serif;font-size:.9rem;resize:vertical }
.popup-field input:focus,.popup-field textarea:focus,.popup-field select:focus { outline:none;border-color:#6366f1;background:rgba(99,102,241,0.08) }
.popup-field select option { background:#1a1a2e }
.popup-field input::placeholder,.popup-field textarea::placeholder { color:rgba(255,255,255,0.3) }
.popup-submit { width:100%;padding:14px;background:linear-gradient(135deg,#6366f1,#4f46e5);border:none;border-radius:10px;color:white;font-family:'Cairo',sans-serif;font-size:1rem;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;margin-top:4px }
.popup-submit:hover { transform:translateY(-2px);box-shadow:0 8px 25px rgba(99,102,241,0.3) }
.popup-success { display:none;text-align:center;padding:20px 0 }
.popup-success.show { display:block }
.popup-success-icon { width:60px;height:60px;background:linear-gradient(135deg,#34d399,#059669);border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 12px;font-size:1.6rem;color:white }
.popup-success h3 { color:#34d399;margin-bottom:8px }
.popup-success p { color:rgba(255,255,255,0.55);font-size:.9rem }