/* ==========================================================================
   Front page intro portal
   ========================================================================== */

:root {
	--saegil-deep: #005aab;
	--saegil-bright: #00aeef;
	--saegil-soft: #e5f3fc;
	--ink-primary: #0f172a;
	--ink-secondary: #334155;
	--ink-muted: #475569;
	--line-color: #e2e8f0;
	--bg-paper: #fbf9f4;
	--bg-white: #ffffff;
	--bg-gray: #f8fafc;
	--accent-gold: #c49e4e;
	--accent-gold-bg: #fffcf5;
	--accent-teal: #3e8a7b;
	--shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.03);
	--shadow-md: 0 10px 30px rgba(0, 45, 90, 0.05);
	--shadow-hover: 0 20px 40px rgba(0, 45, 90, 0.1);
	--shadow-premium: 0 20px 40px rgba(0, 45, 90, 0.08);
	--radius-lg: 16px;
	--radius-md: 12px;
	--transition-core: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.paper-texture *,
.paper-texture *::before,
.paper-texture *::after {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

.paper-texture a {
	text-decoration: none !important;
}

.paper-texture {
	font-family: 'Pretendard', -apple-system, sans-serif;
	color: var(--ink-primary);
	background: var(--bg-paper);
	min-height: 100vh;
	display: flex;
	flex-direction: column;
	-webkit-font-smoothing: antialiased;
	position: relative;
	letter-spacing: -0.01em;
}

.paper-texture::before {
	content: '';
	position: absolute;
	inset: 0;
	background-image: radial-gradient(rgba(0, 90, 171, 0.025) 1px, transparent 1px);
	background-size: 6px 6px;
	pointer-events: none;
	z-index: 0;
}

.paper-texture > * {
	position: relative;
	z-index: 1;
}

.paper-texture .screen-reader-text {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}

.paper-texture .skip-link:focus {
	position: fixed;
	top: 8px;
	left: 8px;
	z-index: 100000;
	width: auto;
	height: auto;
	margin: 0;
	padding: 12px 16px;
	overflow: visible;
	clip: auto;
	white-space: normal;
	color: #fff;
	background: var(--saegil-deep);
	border-radius: 4px;
	text-decoration: none;
}

/* Top navigation — 1:3:1 grid so nav-menu stays visually centered */
.top-navigation-bar {
	background: var(--saegil-deep);
	padding: 16px 60px;
	display: grid;
	grid-template-columns: 1fr 3fr 1fr;
	align-items: center;
	position: relative;
	border-bottom: none;
}

.nav-left-logo {
	display: flex;
	align-items: center;
	gap: 8px;
	color: #fff;
	justify-self: start;
}

.logo-brand-name {
	font-family: 'Pretendard', -apple-system, sans-serif;
	font-weight: 900;
	font-size: 20px;
	letter-spacing: -0.02em;
}

.nav-right-tel {
	display: flex;
	align-items: center;
	gap: 12px;
	color: #fff;
	justify-self: end;
}

.tel-label {
	font-size: 14px;
	font-weight: 600;
	opacity: 0.9;
}

.tel-number {
	font-family: 'Pretendard', -apple-system, sans-serif;
	font-size: 18px;
	font-weight: 700;
	color: #fff;
}

.nav-menu {
	display: flex;
	gap: 24px;
	font-size: 15px;
	font-weight: 600;
	opacity: 0.9;
	color: #fff;
	justify-self: center;
	justify-content: center;
}

/* Intro header */
.intro-header {
	text-align: center;
	padding: 60px 0 40px;
}

.brand-top-tag {
	font-family: 'Pretendard', -apple-system, sans-serif;
	font-size: 13.5px;
	font-weight: 600;
	color: var(--saegil-bright);
	letter-spacing: 0.25em;
	text-transform: uppercase;
	margin-bottom: 14px;
}

.intro-main-title {
	font-family: 'Pretendard', -apple-system, sans-serif;
	font-size: 44px;
	font-weight: 800;
	color: var(--ink-primary);
	line-height: 1.35;
	letter-spacing: -0.03em;
	margin-bottom: 16px;
}

.intro-spine-focus {
	display: inline-block;
	color: var(--saegil-deep);
	background: var(--saegil-soft);
	font-size: 18px;
	font-weight: 800;
	padding: 8px 24px;
	border-radius: 30px;
	margin-bottom: 12px;
	letter-spacing: -0.02em;
}

.intro-sub-title {
	font-size: 17px;
	color: var(--ink-secondary);
	font-weight: 500;
	line-height: 1.6;
	max-width: 650px;
	margin: 0 auto;
}

/* Portal wrapper */
.intro-main {
	width: 100%;
}

.main-portal-wrapper {
	max-width: 1000px;
	width: 100%;
	margin: 0 auto;
	padding: 0 40px 80px;
	display: flex;
	flex-direction: column;
	gap: 24px;
}

/* NOLD card */
.card-nold {
	background: var(--saegil-deep);
	border-radius: var(--radius-lg);
	padding: 64px 56px;
	min-height: 260px;
	border: 1px solid rgba(255, 255, 255, 0.1);
	box-shadow: var(--shadow-premium);
	display: flex;
	justify-content: space-between;
	align-items: center;
	position: relative;
	overflow: hidden;
	transition: var(--transition-core);
}

.card-nold::before {
	content: '';
	position: absolute;
	left: 0;
	top: 0;
	width: 8px;
	height: 100%;
	background: var(--accent-gold);
}

.card-nold:hover {
	transform: translateY(-6px);
	box-shadow: 0 30px 60px rgba(0, 45, 90, 0.25);
	background: #004f96;
}

.card-content-left {
	display: flex;
	flex-direction: column;
	align-items: flex-start;
	width: 100%;
}

.card-nold__badge {
	background: var(--accent-gold);
	color: #fff;
	display: inline-block;
	padding: 6px 14px;
	border-radius: 6px;
	font-size: 13.5px;
	font-weight: 700;
	margin-bottom: 24px;
	letter-spacing: -0.02em;
}

.nold-eyebrow {
	display: block;
	font-size: 14.5px;
	font-weight: 700;
	color: var(--accent-gold);
	margin-bottom: 8px;
	letter-spacing: -0.02em;
}

.card-nold__title {
	font-family: 'Pretendard', -apple-system, sans-serif;
	font-size: 36px;
	font-weight: 800;
	color: #fff;
	line-height: 1.3;
	letter-spacing: -0.02em;
	margin-bottom: 16px;
}

.card-nold__desc {
	font-size: 16.5px;
	color: rgba(255, 255, 255, 0.9);
	line-height: 1.7;
	word-break: keep-all;
	max-width: 620px;
}

.card-nold__footer {
	display: flex;
	justify-content: space-between;
	align-items: flex-end;
	width: 100%;
	margin-top: 32px;
}

.card-nold__link-text {
	font-size: 16px;
	font-weight: 700;
	color: rgba(255, 255, 255, 0.7);
	letter-spacing: -0.02em;
	transition: var(--transition-core);
}

.card-arrow-box {
	width: 48px;
	height: 48px;
	border-radius: 50%;
	display: flex;
	align-items: center;
	justify-content: center;
	transition: var(--transition-core);
	flex-shrink: 0;
}

.card-arrow-box--nold {
	background: rgba(255, 255, 255, 0.15);
	color: #fff;
}

.card-nold:hover .card-arrow-box {
	background: var(--accent-gold) !important;
	color: #fff;
	transform: scale(1.1) rotate(-45deg);
}

/* Twin grid */
.portal-twin-grid {
	display: grid;
	grid-template-columns: repeat(2, 1fr);
	gap: 24px;
	width: 100%;
}

.card-spine-basic {
	background: var(--bg-white);
	border: 1px solid var(--line-color);
	border-radius: var(--radius-lg);
	padding: 40px 48px;
	min-height: 200px;
	display: flex;
	flex-direction: column;
	justify-content: space-between;
	position: relative;
	overflow: hidden;
	box-shadow: var(--shadow-sm);
	transition: var(--transition-core);
}

.card-spine-basic::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	width: 6px;
	height: 100%;
	background: var(--saegil-deep);
	transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.card-spine-basic:hover {
	transform: translateY(-4px);
	box-shadow: var(--shadow-hover);
	border-color: var(--saegil-deep);
}

.card-spine-basic:hover::before {
	width: 10px;
}

.card-spine-basic__badge {
	display: inline-block;
	padding: 6px 12px;
	border-radius: 6px;
	font-size: 13.5px;
	font-weight: 700;
	margin-bottom: 16px;
	background: var(--saegil-soft);
	color: var(--saegil-deep);
}

.card-spine-basic__title {
	font-family: 'Pretendard', -apple-system, sans-serif;
	font-size: 26px;
	font-weight: 800;
	color: var(--ink-primary);
	margin-bottom: 12px;
	letter-spacing: -0.02em;
	word-break: keep-all;
}

.card-spine-basic__desc {
	font-size: 15.5px;
	color: var(--ink-secondary);
	line-height: 1.65;
	word-break: keep-all;
}

.card-spine-basic__footer {
	display: flex;
	justify-content: space-between;
	align-items: flex-end;
	width: 100%;
	margin-top: 24px;
}

.card-spine-basic__link-text {
	font-size: 16px;
	font-weight: 700;
	color: var(--ink-secondary);
	transition: var(--transition-core);
}

.card-arrow-box--spine {
	background: var(--bg-paper);
	color: var(--saegil-deep);
	border: 1px solid var(--line-color);
	width: 44px;
	height: 44px;
}

.card-spine-basic:hover .card-arrow-box {
	background: var(--saegil-deep) !important;
	color: #fff !important;
	transform: translateX(4px);
	border-color: transparent !important;
}

.card-joint {
	background: var(--bg-gray);
	border: 1px solid transparent;
	border-radius: var(--radius-lg);
	padding: 40px 48px;
	min-height: 200px;
	display: flex;
	flex-direction: column;
	justify-content: space-between;
	position: relative;
	overflow: hidden;
	box-shadow: none;
	transition: var(--transition-core);
}

.card-joint::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	width: 6px;
	height: 100%;
	background: var(--accent-teal);
	transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.card-joint:hover {
	transform: translateY(-2px);
	box-shadow: var(--shadow-sm);
	border-color: #cbd5e1;
	background: #f1f5f9;
}

.card-joint:hover::before {
	width: 10px;
}

.card-joint__badge {
	display: inline-block;
	padding: 6px 12px;
	border-radius: 6px;
	font-size: 13.5px;
	font-weight: 700;
	margin-bottom: 16px;
	background: #e2e8f0;
	color: #475569;
}

.card-joint__title {
	font-family: 'Pretendard', -apple-system, sans-serif;
	font-size: 24px;
	font-weight: 700;
	color: var(--ink-secondary);
	margin-bottom: 12px;
	letter-spacing: -0.02em;
	word-break: keep-all;
}

.card-joint__desc {
	font-size: 15px;
	color: var(--ink-muted);
	line-height: 1.65;
	word-break: keep-all;
}

.card-joint__footer {
	display: flex;
	justify-content: space-between;
	align-items: flex-end;
	width: 100%;
	margin-top: 24px;
}

.card-joint__link-text {
	font-size: 16px;
	font-weight: 700;
	color: var(--ink-muted);
	transition: var(--transition-core);
}

.card-arrow-box--joint {
	background: transparent;
	color: var(--ink-muted);
	border: 1px solid #cbd5e1;
	width: 44px;
	height: 44px;
}

.card-joint:hover .card-arrow-box {
	color: var(--ink-secondary) !important;
	border-color: var(--ink-secondary) !important;
	transform: translateX(4px);
}

/* Integration CTA */
.integration-cta {
	display: flex;
	justify-content: center;
	align-items: center;
	padding: 24px;
	background: var(--bg-white);
	border: 2px solid var(--saegil-deep);
	border-radius: var(--radius-md);
	font-size: 20px;
	font-weight: 700;
	color: var(--saegil-deep);
	transition: var(--transition-core);
	gap: 12px;
	box-shadow: var(--shadow-sm);
	letter-spacing: -0.02em;
}

.integration-cta:hover {
	background: var(--saegil-deep);
	color: #fff;
	box-shadow: var(--shadow-hover);
}

@media (max-width: 768px) {
	.portal-twin-grid {
		grid-template-columns: 1fr;
		gap: 16px;
	}

	.top-navigation-bar {
		padding: 16px 24px;
		grid-template-columns: 1fr;
		gap: 12px;
		justify-items: center;
	}

	.nav-left-logo,
	.nav-right-tel {
		justify-self: center;
	}

	.main-portal-wrapper {
		padding: 0 20px 60px;
		gap: 16px;
	}

	.intro-main-title {
		font-size: 32px;
	}

	.card-nold {
		padding: 40px 24px;
		flex-direction: column;
		align-items: flex-start;
		gap: 24px;
	}

	.card-nold .card-arrow-box {
		align-self: flex-end;
	}

	.card-spine-basic,
	.card-joint {
		padding: 32px 24px;
	}
}