:root {
	--bg-start: #e8f1fb;
	--bg-end: #ffffff;
	--card-bg: #ffffff;
	--text-main: #333333;
	--accent: #0078D4;
	--accent-hover: #005a9e;
	--shadow: rgba(0, 120, 212, 0.15);
}

[data-theme="dark"] {
	--bg-start: #0d1b2a;
	--bg-end: #1b2a3d;
	--card-bg: #16263b;
	--text-main: #e8f1fb;
	--accent: #4cc2ff;
	--accent-hover: #74d0ff;
	--shadow: rgba(0, 0, 0, 0.4);
}

* {
	box-sizing: border-box;
}

body {
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	min-height: 100vh;
	margin: 0;
	text-align: center;
	font-family: 'Segoe UI', sans-serif;
	background: linear-gradient(135deg, var(--bg-start), var(--bg-end));
	transition: background 0.4s ease;
	position: relative;
	overflow-x: hidden;
}

.theme-toggle {
	position: absolute;
	top: 1.5rem;
	right: 1.5rem;
	background: var(--card-bg);
	border: none;
	border-radius: 50px;
	padding: 0.6rem 1.2rem;
	font-size: 1rem;
	cursor: pointer;
	box-shadow: 0 4px 15px var(--shadow);
	color: var(--text-main);
	transition: all 0.3s ease;
}

.theme-toggle:hover {
	transform: scale(1.05);
}

nav {
	position: absolute;
	top: 1.5rem;
	left: 1.5rem;
	display: flex;
	gap: 1rem;
}

nav a {
	color: var(--accent);
	text-decoration: none;
	font-weight: 600;
	font-size: 1rem;
	transition: color 0.3s ease;
}

nav a:hover {
	color: var(--accent-hover);
}

.card {
	background: var(--card-bg);
	padding: 3rem 4rem;
	border-radius: 16px;
	box-shadow: 0 8px 30px var(--shadow);
	transition: background 0.4s ease;
	z-index: 1;
	max-width: 600px;
}

h1 {
	font-size: 3.5rem;
	color: var(--accent);
	margin-bottom: 0.5rem;
	transition: color 0.4s ease;
}

h2 {
	font-size: 2.2rem;
	color: var(--accent);
	margin-bottom: 1rem;
	transition: color 0.4s ease;
}

.cloud {
	display: inline-block;
	animation: float 3s ease-in-out infinite;
}

@keyframes float {
	0%, 100% { transform: translateY(0); }
	50% { transform: translateY(-12px); }
}

p {
	font-size: 1.3rem;
	color: var(--text-main);
	margin-bottom: 1.5rem;
	transition: color 0.4s ease;
	line-height: 1.5;
}

#counter {
	font-size: 1rem;
	opacity: 0.7;
}

a.button {
	display: inline-block;
	background: var(--accent);
	color: white;
	text-decoration: none;
	padding: 0.8rem 2rem;
	border-radius: 8px;
	font-size: 1.1rem;
	transition: background 0.2s, transform 0.2s;
}

a.button:hover {
	background: var(--accent-hover);
	transform: translateY(-3px);
}