/**
 * KID Landing Page CSS
 * 2026.01.02 新規作成
 * Auth0風ダークテーマ
 */

/* ========================================
   CSS Variables
   ======================================== */
:root {
	/* Colors */
	--lp-bg-primary: #0a0a0f;
	--lp-bg-secondary: #12121a;
	--lp-bg-card: #1a1a24;
	--lp-bg-card-hover: #22222e;
	--lp-text-primary: #ffffff;
	--lp-text-secondary: #a0a0b0;
	--lp-text-muted: #6a6a7a;
	--lp-accent: #6366f1;
	--lp-accent-light: #818cf8;
	--lp-accent-dark: #4f46e5;
	--lp-gradient-start: #6366f1;
	--lp-gradient-end: #a855f7;
	--lp-border: #2a2a3a;
	--lp-success: #10b981;

	/* Typography */
	--lp-font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
	--lp-font-mono: "SF Mono", "Monaco", "Inconsolata", "Roboto Mono", monospace;

	/* Spacing */
	--lp-container-width: 1200px;
	--lp-section-padding: 100px;
	--lp-gap: 24px;

	/* Effects */
	--lp-radius: 12px;
	--lp-radius-sm: 8px;
	--lp-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
	--lp-transition: 0.3s ease;
}

/* ========================================
   Base Styles
   ======================================== */
*, *::before, *::after {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

html {
	font-size: 16px;
	scroll-behavior: smooth;
}

body {
	font-family: var(--lp-font-family);
	background-color: var(--lp-bg-primary);
	color: var(--lp-text-primary);
	line-height: 1.6;
	min-height: 100vh;
	-webkit-font-smoothing: antialiased;
}

a {
	color: var(--lp-accent-light);
	text-decoration: none;
	transition: color var(--lp-transition);
}

a:hover {
	color: var(--lp-text-primary);
}

/* ========================================
   Container
   ======================================== */
.lp-container {
	max-width: var(--lp-container-width);
	margin: 0 auto;
	padding: 0 var(--lp-gap);
}

/* ========================================
   Header
   ======================================== */
.lp-header {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	z-index: 100;
	background: rgba(10, 10, 15, 0.8);
	backdrop-filter: blur(12px);
	border-bottom: 1px solid var(--lp-border);
}

.lp-header .lp-container {
	display: flex;
	align-items: center;
	justify-content: space-between;
	height: 72px;
}

.lp-logo {
	display: flex;
	align-items: center;
	gap: 12px;
}

.lp-logo-img {
	width: 40px;
	height: 40px;
}

.lp-logo-text {
	font-size: 1.5rem;
	font-weight: 700;
	letter-spacing: 0.05em;
	background: linear-gradient(135deg, var(--lp-gradient-start), var(--lp-gradient-end));
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	background-clip: text;
}

.lp-nav {
	display: flex;
	align-items: center;
	gap: 16px;
}

/* ========================================
   Buttons
   ======================================== */
.lp-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	padding: 12px 24px;
	font-size: 1rem;
	font-weight: 500;
	font-family: var(--lp-font-family);
	border-radius: var(--lp-radius-sm);
	border: none;
	cursor: pointer;
	transition: all var(--lp-transition);
	text-decoration: none;
}

.lp-btn i {
	font-size: 1.25rem;
}

.lp-btn-primary {
	background: linear-gradient(135deg, var(--lp-gradient-start), var(--lp-gradient-end));
	color: var(--lp-text-primary);
	box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4);
}

.lp-btn-primary:hover {
	transform: translateY(-2px);
	box-shadow: 0 6px 24px rgba(99, 102, 241, 0.5);
	color: var(--lp-text-primary);
}

.lp-btn-secondary {
	background: var(--lp-bg-card);
	color: var(--lp-text-primary);
	border: 1px solid var(--lp-border);
}

.lp-btn-secondary:hover {
	background: var(--lp-bg-card-hover);
	border-color: var(--lp-accent);
	color: var(--lp-text-primary);
}

.lp-btn-outline {
	background: transparent;
	color: var(--lp-text-primary);
	border: 1px solid var(--lp-border);
}

.lp-btn-outline:hover {
	background: var(--lp-bg-card);
	border-color: var(--lp-accent);
	color: var(--lp-text-primary);
}

.lp-btn-lg {
	padding: 16px 32px;
	font-size: 1.125rem;
}

/* ========================================
   Hero Section
   ======================================== */
.lp-hero {
	position: relative;
	min-height: 100vh;
	display: flex;
	align-items: center;
	padding-top: 72px;
	overflow: hidden;
}

.lp-hero-bg {
	position: absolute;
	inset: 0;
	background:
		radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.15), transparent),
		radial-gradient(ellipse 60% 40% at 80% 60%, rgba(168, 85, 247, 0.1), transparent),
		radial-gradient(ellipse 40% 30% at 20% 80%, rgba(99, 102, 241, 0.08), transparent);
	pointer-events: none;
}

.lp-hero .lp-container {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 60px;
	align-items: center;
	position: relative;
	z-index: 1;
}

.lp-hero-content {
	max-width: 560px;
}

.lp-hero-title {
	font-size: 3.5rem;
	font-weight: 700;
	line-height: 1.2;
	margin-bottom: 24px;
	letter-spacing: -0.02em;
}

.lp-hero-title-sub {
	display: block;
	font-size: 1rem;
	font-weight: 500;
	color: var(--lp-accent-light);
	letter-spacing: 0.1em;
	text-transform: uppercase;
	margin-bottom: 16px;
}

.lp-hero-desc {
	font-size: 1.25rem;
	color: var(--lp-text-secondary);
	line-height: 1.7;
	margin-bottom: 40px;
}

.lp-hero-actions {
	display: flex;
	gap: 16px;
	flex-wrap: wrap;
}

/* Hero Visual */
.lp-hero-visual {
	display: flex;
	justify-content: center;
	align-items: center;
}

.lp-hero-card {
	background: var(--lp-bg-card);
	border: 1px solid var(--lp-border);
	border-radius: var(--lp-radius);
	padding: 32px;
	width: 320px;
	box-shadow: var(--lp-shadow);
	animation: float 6s ease-in-out infinite;
}

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

.lp-hero-card-header {
	display: flex;
	align-items: center;
	gap: 12px;
	margin-bottom: 24px;
	color: var(--lp-success);
	font-weight: 600;
}

.lp-hero-card-header i {
	font-size: 1.5rem;
}

.lp-hero-card-body {
	display: flex;
	flex-direction: column;
	gap: 12px;
}

.lp-hero-card-line {
	height: 12px;
	background: var(--lp-bg-secondary);
	border-radius: 6px;
}

.lp-hero-card-line-short {
	width: 60%;
}

.lp-hero-card-dots {
	display: flex;
	gap: 8px;
	margin-top: 8px;
}

.lp-hero-card-dots span {
	width: 10px;
	height: 10px;
	background: var(--lp-accent);
	border-radius: 50%;
	opacity: 0.6;
}

.lp-hero-card-dots span:first-child {
	opacity: 1;
}

/* ========================================
   Section Title
   ======================================== */
.lp-section-title {
	font-size: 2.5rem;
	font-weight: 700;
	text-align: center;
	margin-bottom: 60px;
	letter-spacing: -0.02em;
}

/* ========================================
   Features Section
   ======================================== */
.lp-features {
	padding: var(--lp-section-padding) 0;
	background: var(--lp-bg-secondary);
}

.lp-features-grid {
	display: grid;
	grid-template-columns: repeat(2, 1fr);
	gap: 32px;
}

.lp-feature-card {
	background: var(--lp-bg-card);
	border: 1px solid var(--lp-border);
	border-radius: var(--lp-radius);
	padding: 40px;
	transition: all var(--lp-transition);
}

.lp-feature-card:hover {
	transform: translateY(-4px);
	border-color: var(--lp-accent);
	box-shadow: 0 8px 32px rgba(99, 102, 241, 0.15);
}

.lp-feature-icon {
	width: 56px;
	height: 56px;
	display: flex;
	align-items: center;
	justify-content: center;
	background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(168, 85, 247, 0.2));
	border-radius: 12px;
	margin-bottom: 24px;
}

.lp-feature-icon i {
	font-size: 1.75rem;
	color: var(--lp-accent-light);
}

.lp-feature-title {
	font-size: 1.375rem;
	font-weight: 600;
	margin-bottom: 12px;
}

.lp-feature-desc {
	color: var(--lp-text-secondary);
	line-height: 1.7;
}

/* ========================================
   Specs Section
   ======================================== */
.lp-specs {
	padding: var(--lp-section-padding) 0;
}

.lp-specs .lp-container {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 60px;
	align-items: center;
}

.lp-specs .lp-section-title {
	text-align: left;
	margin-bottom: 24px;
}

.lp-specs-desc {
	font-size: 1.125rem;
	color: var(--lp-text-secondary);
	line-height: 1.7;
	margin-bottom: 32px;
}

.lp-specs-list {
	display: flex;
	flex-direction: column;
	gap: 16px;
}

.lp-spec-item {
	display: flex;
	align-items: center;
	gap: 12px;
	font-size: 1rem;
}

.lp-spec-item i {
	color: var(--lp-success);
	font-size: 1.25rem;
}

/* Code Block */
.lp-code-block {
	background: var(--lp-bg-card);
	border: 1px solid var(--lp-border);
	border-radius: var(--lp-radius);
	overflow: hidden;
}

.lp-code-header {
	display: flex;
	align-items: center;
	gap: 8px;
	padding: 16px 20px;
	background: var(--lp-bg-secondary);
	border-bottom: 1px solid var(--lp-border);
}

.lp-code-dot {
	width: 12px;
	height: 12px;
	border-radius: 50%;
	background: var(--lp-border);
}

.lp-code-dot:nth-child(1) { background: #ff5f56; }
.lp-code-dot:nth-child(2) { background: #ffbd2e; }
.lp-code-dot:nth-child(3) { background: #27ca40; }

.lp-code-title {
	margin-left: auto;
	font-size: 0.875rem;
	color: var(--lp-text-muted);
}

.lp-code-content {
	padding: 24px;
	overflow-x: auto;
}

.lp-code-content code {
	font-family: var(--lp-font-mono);
	font-size: 0.875rem;
	line-height: 1.8;
	color: var(--lp-text-secondary);
}

/* ========================================
   Tech Info Section (共通)
   OAuth 2.0, Ed25519 等の技術紹介セクション
   ======================================== */
.lp-tech-section {
	padding: var(--lp-section-padding) 0;
}

.lp-tech-section.lp-bg-alt {
	background: var(--lp-bg-secondary);
}

.lp-tech-content {
	max-width: 800px;
	margin: 0 auto;
}

.lp-tech-desc {
	font-size: 1.125rem;
	color: var(--lp-text-secondary);
	line-height: 1.8;
	text-align: center;
	margin-bottom: 48px;
}

.lp-tech-desc strong {
	color: var(--lp-accent-light);
}

.lp-tech-grid {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 24px;
}

.lp-tech-card {
	display: flex;
	align-items: flex-start;
	gap: 16px;
	padding: 24px;
	background: var(--lp-bg-card);
	border: 1px solid var(--lp-border);
	border-radius: var(--lp-radius);
	transition: all var(--lp-transition);
}

.lp-tech-card:hover {
	border-color: var(--lp-accent);
	transform: translateY(-2px);
}

.lp-tech-card i {
	font-size: 1.5rem;
	color: var(--lp-accent-light);
	flex-shrink: 0;
	margin-top: 2px;
}

.lp-tech-card div strong {
	display: block;
	font-size: 1rem;
	font-weight: 600;
	color: var(--lp-text-primary);
	margin-bottom: 4px;
}

.lp-tech-card div span {
	font-size: 0.875rem;
	color: var(--lp-text-muted);
	line-height: 1.5;
}

@media (max-width: 768px) {
	.lp-tech-grid {
		grid-template-columns: 1fr;
	}
}

/* ========================================
   CTA Section
   ======================================== */
.lp-cta {
	padding: var(--lp-section-padding) 0;
	background: linear-gradient(180deg, var(--lp-bg-secondary) 0%, var(--lp-bg-primary) 100%);
	text-align: center;
}

.lp-cta-title {
	font-size: 2.5rem;
	font-weight: 700;
	margin-bottom: 16px;
}

.lp-cta-desc {
	font-size: 1.25rem;
	color: var(--lp-text-secondary);
	margin-bottom: 40px;
}

.lp-cta-actions {
	display: flex;
	justify-content: center;
	gap: 16px;
}

/* ========================================
   Footer
   ======================================== */
.lp-footer {
	padding: 48px 0;
	border-top: 1px solid var(--lp-border);
}

.lp-footer-content {
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin-bottom: 24px;
}

.lp-footer-logo {
	display: flex;
	align-items: center;
	gap: 12px;
	color: var(--lp-text-secondary);
}

.lp-footer-logo .lp-logo-img {
	width: 32px;
	height: 32px;
	opacity: 0.8;
}

.lp-footer-links {
	display: flex;
	gap: 24px;
}

.lp-footer-links a {
	color: var(--lp-text-muted);
	font-size: 0.875rem;
}

.lp-footer-links a:hover {
	color: var(--lp-text-primary);
}

.lp-footer-copyright {
	text-align: center;
	color: var(--lp-text-muted);
	font-size: 0.875rem;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 1024px) {
	.lp-hero .lp-container {
		grid-template-columns: 1fr;
		text-align: center;
	}

	.lp-hero-content {
		max-width: 100%;
	}

	.lp-hero-actions {
		justify-content: center;
	}

	.lp-hero-visual {
		display: none;
	}

	.lp-specs .lp-container {
		grid-template-columns: 1fr;
	}

	.lp-specs .lp-section-title {
		text-align: center;
	}

	.lp-specs-content {
		text-align: center;
	}

	.lp-specs-list {
		align-items: center;
	}
}

@media (max-width: 768px) {
	:root {
		--lp-section-padding: 60px;
	}

	.lp-hero-title {
		font-size: 2.5rem;
	}

	.lp-hero-desc {
		font-size: 1.125rem;
	}

	.lp-section-title {
		font-size: 2rem;
	}

	.lp-features-grid {
		grid-template-columns: 1fr;
	}

	.lp-feature-card {
		padding: 32px;
	}

	.lp-footer-content {
		flex-direction: column;
		gap: 24px;
		text-align: center;
	}

	.lp-btn-lg {
		padding: 14px 24px;
		font-size: 1rem;
	}
}

@media (max-width: 480px) {
	.lp-hero-title {
		font-size: 2rem;
	}

	.lp-hero-actions {
		flex-direction: column;
		width: 100%;
	}

	.lp-hero-actions .lp-btn {
		width: 100%;
	}

	.lp-cta-actions {
		flex-direction: column;
		align-items: center;
	}

	.lp-cta-actions .lp-btn {
		width: 100%;
		max-width: 300px;
	}
}