:root {
	--bg-deep: #050608;
	--bg-card: rgba(255, 255, 255, 0.03);
	--accent-gold: #c5a059;
	--accent-glow: rgba(56, 189, 248, 0.15);
	--text-main: #f8fafc;
	--text-dim: #94a3b8;
	--transition: all 0.8s cubic-bezier(0.22, 1, 0.36, 1);

	/* Theme Origins */
	--theme-color: #1e1b4b;
	/* Default Depth */
}

* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
	-webkit-tap-highlight-color: transparent;
}

body {
	background-color: var(--bg-deep);
	color: var(--text-main);
	font-family: 'Inter', 'Noto Sans KR', sans-serif;
	overflow-x: hidden;
	word-break: keep-all;
	transition: background-color 1s ease;
}

/* Ambient Background */
.ambient-bg {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	z-index: -1;
	background: radial-gradient(circle at 50% 50%, var(--theme-color) 0%, var(--bg-deep) 100%);
	transition: background 1.5s ease;
}

.cursor-glow {
	position: fixed;
	width: 600px;
	height: 600px;
	background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
	border-radius: 50%;
	pointer-events: none;
	z-index: -1;
	transform: translate(-50%, -50%);
	filter: blur(40px);
	opacity: 0.6;
	transition: opacity 1s ease, background 1s ease;
}

/* Layout */
.wrapper {
	min-height: 100vh;
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	padding: 2rem;
	text-align: center;
}

/* Typography & Content */
.hero {
	opacity: 0;
	transform: translateY(30px);
	animation: reveal 1.2s forwards ease-out;
}

.title {
	font-size: clamp(3.5rem, 12vw, 7rem);
	font-weight: 700;
	letter-spacing: -0.05em;
	margin-bottom: 1.5rem;
	background: linear-gradient(180deg, #ffffff 10%, #94a3b8 50%, #020617 100%);
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	line-height: 1;
	filter: drop-shadow(0 10px 15px rgba(0, 0, 0, 0.6));
}

.description {
	font-size: clamp(1.1rem, 4vw, 1.4rem);
	font-weight: 300;
	color: var(--text-dim);
	max-width: 600px;
	margin-bottom: 4rem;
	line-height: 1.8;
}

/* Interactive Card */
.card-group {
	display: flex;
	gap: 1.5rem;
	flex-wrap: wrap;
	justify-content: center;
	opacity: 0;
	animation: reveal 1.2s forwards 0.4s ease-out;
}

.card {
	background: var(--bg-card);
	border: 1px solid rgba(255, 255, 255, 0.05);
	padding: 2rem 3rem;
	border-radius: 20px;
	backdrop-filter: blur(12px);
	transition: var(--transition);
	cursor: pointer;
	position: relative;
	overflow: hidden;
	user-select: none;
}

.card.active {
	border-color: var(--accent-gold);
	background: rgba(255, 255, 255, 0.08);
	transform: scale(1.05);
}

.card:hover {
	transform: translateY(-8px);
	border-color: rgba(255, 255, 255, 0.2);
	background: rgba(255, 255, 255, 0.05);
	box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

.card::after {
	content: '';
	position: absolute;
	top: 0;
	left: -100%;
	width: 100%;
	height: 100%;
	background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.03), transparent);
	transition: 0.8s;
}

.card:hover::after {
	left: 100%;
}

.card-text {
	font-size: 1.1rem;
	letter-spacing: 0.1em;
	color: var(--text-main);
	pointer-events: none;
}

/* Footer */
footer {
	margin-top: auto;
	padding-top: 4rem;
	font-size: 0.85rem;
	color: var(--text-dim);
	letter-spacing: 0.2em;
	opacity: 0;
	animation: fadeIn 2s forwards 1s;
}

/* Animations */
@keyframes reveal {
	to {
		opacity: 1;
		transform: translateY(0);
	}
}

@keyframes fadeIn {
	to {
		opacity: 1;
	}
}

/* Mobile Optimization */
@media (max-width: 768px) {
	.wrapper {
		padding: 1.5rem;
	}

	.title {
		margin-bottom: 1rem;
	}

	.card {
		width: 100%;
		padding: 1.5rem;
	}

	.cursor-glow {
		display: none;
	}
}