:root {
	--blue: #0d6efd;
	--aqua: #1fdc5b;
	--danger: #dc3545;
	--warning: #ffc107;
	--bg-light: #f5f5f5;
}

body {
	overflow-x: hidden;
	background: var(--bg-light);
	font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

/* Spinner overlay */
#spinnerOverlay {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background: rgba(255, 255, 255, 0.7);
	display: none;
	justify-content: center;
	align-items: center;
	z-index: 1050;
}
.spinner-box {
	text-align: center;
}

/* HERO */
.hero {
	background: linear-gradient(rgba(13, 110, 253, 1), rgba(13, 110, 253, 0.65));
	color: white;
	padding: 3rem 0;
}
.hero-card {
	background: rgba(255, 255, 255, 0.082);
	backdrop-filter: blur(6px);
	border-radius: 14px;
	padding: 2rem;
}
.wqi {
	font-size: 3.8rem;
	font-weight: 700;
	color: var(--aqua);
}
.wqi.bad {
	color: var(--danger);
}
.wqi.warn {
	color: var(--warning);
}
.section-title {
	font-size: 0.7rem;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	opacity: 0.85;
}

/* PARAMETERS */
.param {
	padding-left: 1rem;
	border-left: 4px solid rgba(255, 255, 255, 0.35);
}
.param.safe {
	border-color: var(--aqua);
}
.param.warn {
	border-color: var(--warning);
}
.param.danger {
	border-color: var(--danger);
}
.param-label {
	font-size: 0.65rem;
	opacity: 0.85;
	text-transform: uppercase;
}
.param-value {
	font-size: 1.25rem;
	font-weight: 600;
}

/* MAIN */
.main {
	margin-top: -2rem;
	min-height: 100vh;
}
.surface {
	background: white;
	border-radius: 14px;
	padding: 2rem;
	border: 1px solid #e5e7eb;
}

/* TABS */
.nav-tabs {
	border-bottom: 1px solid #e5e7eb;
}
.nav-tabs .nav-link {
	border: none;
	color: #6c757d;
	font-weight: 500;
}
.nav-tabs .nav-link.active {
	color: var(--blue);
	border-bottom: 3px solid var(--blue);
	background: transparent;
}

/* ALERTS */
.alert {
	border-radius: 10px;
	margin-bottom: 0.5rem;
}

/* BADGES */
.badge {
	font-size: 0.8rem;
	width: 15px;
	height: 15px;
	padding: 0;
}

/* FOOTER */
footer {
	background: #212529;
	color: #aaa;
	padding: 1rem 0;
	text-align: center;
}
/* Hero action buttons – simple white boxes */
#changeDeviceBtn,
#recalcBtn {
	background: #ffffff;
	color: #212529;
	border: none;
	border-radius: 12px;
	padding: 8px 16px;
	font-size: 0.8rem;
	font-weight: 600;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	transition: transform 0.15s ease, box-shadow 0.15s ease;
	box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

/* Hover – subtle lift only */
#changeDeviceBtn:hover,
#recalcBtn:hover {
	transform: translateY(-1px);
	box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

/* Active – press */
#changeDeviceBtn:active,
#recalcBtn:active {
	transform: translateY(0);
	box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

/* Mobile */
@media (max-width: 576px) {
	#changeDeviceBtn,
	#recalcBtn {
		width: 100%;
	}
}