/**
 * Kodama & Company, Inc. - Corporate Design System
 * A refined Silicon Valley tech aesthetic
 *
 * @version 2.0.0
 * @updated 2026.01
 */

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
	/* Colors - Deep tech palette */
	--color-bg-primary: #0a0a0f;
	--color-bg-secondary: #12121a;
	--color-bg-tertiary: #1a1a24;
	--color-bg-card: rgba(255, 255, 255, 0.03);
	--color-bg-card-hover: rgba(255, 255, 255, 0.06);

	/* Text colors */
	--color-text-primary: #ffffff;
	--color-text-secondary: #a0a0b0;
	--color-text-tertiary: #6a6a7a;

	/* Accent colors */
	--color-accent: #3b82f6;
	--color-accent-hover: #60a5fa;
	--color-accent-subtle: rgba(59, 130, 246, 0.1);

	/* Borders */
	--color-border: rgba(255, 255, 255, 0.08);
	--color-border-hover: rgba(255, 255, 255, 0.15);

	/* Typography */
	--font-family: -apple-system, BlinkMacSystemFont, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', 'Yu Gothic', 'Meiryo', sans-serif;
	--font-family-mono: 'SF Mono', 'Menlo', 'Monaco', monospace;

	/* Font sizes */
	--text-xs: 0.75rem;
	--text-sm: 0.875rem;
	--text-base: 1rem;
	--text-lg: 1.125rem;
	--text-xl: 1.25rem;
	--text-2xl: 1.5rem;
	--text-3xl: 1.875rem;
	--text-4xl: 2.25rem;
	--text-5xl: 3rem;
	--text-6xl: 3.75rem;

	/* Spacing */
	--space-1: 0.25rem;
	--space-2: 0.5rem;
	--space-3: 0.75rem;
	--space-4: 1rem;
	--space-5: 1.25rem;
	--space-6: 1.5rem;
	--space-8: 2rem;
	--space-10: 2.5rem;
	--space-12: 3rem;
	--space-16: 4rem;
	--space-20: 5rem;
	--space-24: 6rem;

	/* Layout */
	--max-width: 1200px;
	--max-width-narrow: 800px;
	--header-height: 80px;

	/* Effects */
	--shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
	--shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
	--shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
	--shadow-glow: 0 0 40px rgba(59, 130, 246, 0.15);

	/* Transitions */
	--transition-fast: 150ms ease;
	--transition-base: 250ms ease;
	--transition-slow: 400ms ease;

	/* Border radius */
	--radius-sm: 4px;
	--radius-md: 8px;
	--radius-lg: 12px;
	--radius-xl: 16px;
}

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

html {
	scroll-behavior: smooth;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

body {
	font-family: var(--font-family);
	font-size: var(--text-base);
	line-height: 1.6;
	color: var(--color-text-primary);
	background-color: var(--color-bg-primary);
	min-height: 100vh;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
	font-weight: 600;
	line-height: 1.2;
	letter-spacing: -0.02em;
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

p {
	color: var(--color-text-secondary);
	line-height: 1.7;
}

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

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

/* ============================================
   Layout Utilities
   ============================================ */
.container {
	width: 100%;
	max-width: var(--max-width);
	margin: 0 auto;
	padding: 0 var(--space-6);
}

.container--narrow {
	max-width: var(--max-width-narrow);
}

.section {
	padding: var(--space-24) 0;
}

.section--hero {
	padding: 0;
	min-height: 100vh;
	display: flex;
	align-items: center;
	justify-content: center;
}

/* ============================================
   Header
   ============================================ */
.header {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	height: var(--header-height);
	z-index: 1000;
	transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.header--scrolled {
	background-color: rgba(10, 10, 15, 0.95);
	backdrop-filter: blur(20px);
	-webkit-backdrop-filter: blur(20px);
	box-shadow: 0 1px 0 var(--color-border);
}

.header__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	height: 100%;
	max-width: var(--max-width);
	margin: 0 auto;
	padding: 0 var(--space-6);
}

.header__logo {
	display: flex;
	align-items: center;
	gap: var(--space-3);
	color: var(--color-text-primary);
	font-weight: 700;
	font-size: var(--text-xl);
	letter-spacing: -0.01em;
}

.header__logo img {
	width: 40px;
	height: 40px;
}

.header__logo:hover {
	color: var(--color-text-primary);
}

.header__nav {
	display: flex;
	align-items: center;
	gap: var(--space-1);
}

.header__nav-link {
	color: var(--color-text-secondary);
	padding: var(--space-2) var(--space-4);
	border-radius: var(--radius-md);
	font-size: var(--text-sm);
	font-weight: 500;
	transition: color var(--transition-fast), background-color var(--transition-fast);
}

.header__nav-link:hover {
	color: var(--color-text-primary);
	background-color: var(--color-bg-card-hover);
}

.header__nav-link--active {
	color: var(--color-text-primary);
}

.header__lang {
	margin-left: var(--space-4);
	padding-left: var(--space-4);
	border-left: 1px solid var(--color-border);
}

.header__lang-select {
	background: transparent;
	border: 1px solid var(--color-border);
	color: var(--color-text-secondary);
	padding: var(--space-2) var(--space-3);
	border-radius: var(--radius-sm);
	font-size: var(--text-sm);
	cursor: pointer;
}

/* Mobile menu */
.header__mobile-toggle {
	display: none;
	background: none;
	border: none;
	color: var(--color-text-primary);
	cursor: pointer;
	padding: var(--space-2);
}

/* ============================================
   Hero Section (Video Background)
   ============================================ */
.hero {
	position: relative;
	width: 100%;
	height: 100vh;
	overflow: hidden;
	display: flex;
	align-items: center;
	justify-content: center;
}

.hero__video-container {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	z-index: 0;
}

.hero__video {
	min-width: 100%;
	min-height: 100%;
	width: auto;
	height: auto;
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	object-fit: cover;
}

.hero__overlay {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background: linear-gradient(
		180deg,
		rgba(10, 10, 15, 0.4) 0%,
		rgba(10, 10, 15, 0.6) 50%,
		rgba(10, 10, 15, 0.9) 100%
	);
	z-index: 1;
}

.hero__content {
	position: relative;
	z-index: 2;
	text-align: center;
	max-width: 800px;
	padding: var(--space-6);
}

.hero__tagline {
	font-size: var(--text-sm);
	font-weight: 500;
	color: var(--color-accent);
	text-transform: uppercase;
	letter-spacing: 0.15em;
	margin-bottom: var(--space-4);
}

.hero__title {
	font-size: clamp(2.5rem, 5vw, 4rem);
	font-weight: 700;
	line-height: 1.1;
	margin-bottom: var(--space-6);
	background: linear-gradient(135deg, #ffffff 0%, #a0a0b0 100%);
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	background-clip: text;
}

.hero__description {
	font-size: var(--text-lg);
	color: var(--color-text-secondary);
	max-width: 600px;
	margin: 0 auto var(--space-8);
	line-height: 1.7;
}

.hero__cta {
	display: flex;
	gap: var(--space-4);
	justify-content: center;
	flex-wrap: wrap;
}

.hero__scroll-indicator {
	position: absolute;
	bottom: var(--space-8);
	left: 50%;
	transform: translateX(-50%);
	z-index: 2;
	color: var(--color-text-tertiary);
	font-size: var(--text-sm);
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: var(--space-2);
	animation: bounce 2s infinite;
}

@keyframes bounce {
	0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
	40% { transform: translateX(-50%) translateY(-10px); }
	60% { transform: translateX(-50%) translateY(-5px); }
}

/* ============================================
   Buttons
   ============================================ */
.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: var(--space-2);
	padding: var(--space-3) var(--space-6);
	border-radius: var(--radius-md);
	font-size: var(--text-sm);
	font-weight: 500;
	cursor: pointer;
	transition: all var(--transition-fast);
	border: none;
	text-decoration: none;
}

.btn--primary {
	background: var(--color-accent);
	color: white;
}

.btn--primary:hover {
	background: var(--color-accent-hover);
	color: white;
	transform: translateY(-1px);
	box-shadow: var(--shadow-glow);
}

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

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

.btn--large {
	padding: var(--space-4) var(--space-8);
	font-size: var(--text-base);
}

/* ============================================
   Cards
   ============================================ */
.card {
	background: var(--color-bg-card);
	border: 1px solid var(--color-border);
	border-radius: var(--radius-lg);
	padding: var(--space-8);
	transition: all var(--transition-base);
}

.card:hover {
	background: var(--color-bg-card-hover);
	border-color: var(--color-border-hover);
	transform: translateY(-2px);
}

.card__icon {
	width: 64px;
	height: 64px;
	margin-bottom: var(--space-6);
	border-radius: var(--radius-md);
	object-fit: contain;
}

.card__title {
	font-size: var(--text-xl);
	font-weight: 600;
	margin-bottom: var(--space-3);
	color: var(--color-text-primary);
}

.card__description {
	color: var(--color-text-secondary);
	font-size: var(--text-sm);
	line-height: 1.6;
	margin-bottom: var(--space-6);
}

.card__link {
	font-size: var(--text-sm);
	font-weight: 500;
	display: inline-flex;
	align-items: center;
	gap: var(--space-2);
}

.card__link::after {
	content: '→';
	transition: transform var(--transition-fast);
}

.card:hover .card__link::after {
	transform: translateX(4px);
}

/* ============================================
   Grid Layouts
   ============================================ */
.grid {
	display: grid;
	gap: var(--space-6);
}

.grid--2 {
	grid-template-columns: repeat(2, 1fr);
}

.grid--3 {
	grid-template-columns: repeat(3, 1fr);
}

.grid--4 {
	grid-template-columns: repeat(4, 1fr);
}

/* ============================================
   Section Headers
   ============================================ */
.section-header {
	text-align: center;
	max-width: 600px;
	margin: 0 auto var(--space-16);
}

.section-header__label {
	font-size: var(--text-sm);
	font-weight: 500;
	color: var(--color-accent);
	text-transform: uppercase;
	letter-spacing: 0.1em;
	margin-bottom: var(--space-4);
}

.section-header__title {
	font-size: var(--text-4xl);
	margin-bottom: var(--space-4);
}

.section-header__description {
	font-size: var(--text-lg);
	color: var(--color-text-secondary);
}

/* ============================================
   Trust Indicators
   ============================================ */
.trust-indicators {
	display: flex;
	justify-content: center;
	gap: var(--space-12);
	flex-wrap: wrap;
	padding: var(--space-12) 0;
	border-top: 1px solid var(--color-border);
	border-bottom: 1px solid var(--color-border);
}

.trust-indicator {
	text-align: center;
}

.trust-indicator__value {
	font-size: var(--text-3xl);
	font-weight: 700;
	color: var(--color-text-primary);
	margin-bottom: var(--space-2);
}

.trust-indicator__label {
	font-size: var(--text-sm);
	color: var(--color-text-tertiary);
}

/* ============================================
   Footer
   ============================================ */
.footer {
	background: var(--color-bg-secondary);
	border-top: 1px solid var(--color-border);
	padding: var(--space-16) 0 var(--space-8);
}

.footer__grid {
	display: grid;
	grid-template-columns: 2fr repeat(4, 1fr);
	gap: var(--space-12);
	margin-bottom: var(--space-12);
}

.footer__brand {
	max-width: 280px;
}

.footer__logo {
	display: flex;
	align-items: center;
	gap: var(--space-3);
	color: var(--color-text-primary);
	font-weight: 700;
	font-size: var(--text-lg);
	margin-bottom: var(--space-4);
}

.footer__logo img {
	width: 32px;
	height: 32px;
}

.footer__tagline {
	font-size: var(--text-sm);
	color: var(--color-text-tertiary);
	line-height: 1.6;
}

.footer__column-title {
	font-size: var(--text-sm);
	font-weight: 600;
	color: var(--color-text-primary);
	margin-bottom: var(--space-4);
	text-transform: uppercase;
	letter-spacing: 0.05em;
}

.footer__links {
	list-style: none;
	display: flex;
	flex-direction: column;
	gap: var(--space-3);
}

.footer__link {
	font-size: var(--text-sm);
	color: var(--color-text-tertiary);
	transition: color var(--transition-fast);
}

.footer__link:hover {
	color: var(--color-text-primary);
}

.footer__bottom {
	display: flex;
	justify-content: space-between;
	align-items: center;
	padding-top: var(--space-8);
	border-top: 1px solid var(--color-border);
}

.footer__copyright {
	font-size: var(--text-sm);
	color: var(--color-text-tertiary);
}

.footer__location {
	font-size: var(--text-sm);
	color: var(--color-text-tertiary);
}

/* ============================================
   Page Headers
   ============================================ */
.page-header {
	padding: calc(var(--header-height) + var(--space-16)) 0 var(--space-16);
	background: var(--color-bg-secondary);
	border-bottom: 1px solid var(--color-border);
}

.page-header__title {
	font-size: var(--text-4xl);
	margin-bottom: var(--space-4);
}

.page-header__description {
	font-size: var(--text-lg);
	color: var(--color-text-secondary);
	max-width: 600px;
}

/* ============================================
   Content Sections
   ============================================ */
.content-section {
	padding: var(--space-20) 0;
}

.content-section--alt {
	background: var(--color-bg-secondary);
}

.content-section__title {
	font-size: var(--text-2xl);
	margin-bottom: var(--space-6);
}

.content-section__text {
	color: var(--color-text-secondary);
	line-height: 1.8;
}

.content-section__text p + p {
	margin-top: var(--space-4);
}

/* ============================================
   Lists
   ============================================ */
.feature-list {
	list-style: none;
	display: flex;
	flex-direction: column;
	gap: var(--space-4);
}

.feature-list__item {
	display: flex;
	align-items: flex-start;
	gap: var(--space-3);
	color: var(--color-text-secondary);
}

.feature-list__item::before {
	content: '';
	width: 6px;
	height: 6px;
	background: var(--color-accent);
	border-radius: 50%;
	margin-top: 0.5em;
	flex-shrink: 0;
}

/* ============================================
   Timeline / News
   ============================================ */
.timeline {
	display: flex;
	flex-direction: column;
	gap: var(--space-6);
}

.timeline__item {
	display: grid;
	grid-template-columns: 120px 1fr;
	gap: var(--space-6);
	padding-bottom: var(--space-6);
	border-bottom: 1px solid var(--color-border);
}

.timeline__date {
	font-size: var(--text-sm);
	color: var(--color-text-tertiary);
	font-family: var(--font-family-mono);
}

.timeline__content-title {
	font-size: var(--text-base);
	font-weight: 500;
	margin-bottom: var(--space-2);
}

.timeline__content-text {
	font-size: var(--text-sm);
	color: var(--color-text-secondary);
}

/* ============================================
   Forms
   ============================================ */
.form-group {
	margin-bottom: var(--space-6);
}

.form-label {
	display: block;
	font-size: var(--text-sm);
	font-weight: 500;
	margin-bottom: var(--space-2);
	color: var(--color-text-primary);
}

.form-input,
.form-textarea {
	width: 100%;
	padding: var(--space-3) var(--space-4);
	background: var(--color-bg-tertiary);
	border: 1px solid var(--color-border);
	border-radius: var(--radius-md);
	color: var(--color-text-primary);
	font-size: var(--text-base);
	font-family: inherit;
	transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
	outline: none;
	border-color: var(--color-accent);
}

.form-textarea {
	min-height: 150px;
	resize: vertical;
}

/* ============================================
   Animations (AOS-like)
   ============================================ */
[data-animate] {
	opacity: 0;
	transform: translateY(20px);
	transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].is-visible {
	opacity: 1;
	transform: translateY(0);
}

[data-animate-delay="1"] { transition-delay: 0.1s; }
[data-animate-delay="2"] { transition-delay: 0.2s; }
[data-animate-delay="3"] { transition-delay: 0.3s; }
[data-animate-delay="4"] { transition-delay: 0.4s; }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
	.grid--3 {
		grid-template-columns: repeat(2, 1fr);
	}

	.grid--4 {
		grid-template-columns: repeat(2, 1fr);
	}

	.footer__grid {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (max-width: 768px) {
	:root {
		--header-height: 64px;
	}

	.header__nav {
		display: none;
	}

	.header__mobile-toggle {
		display: block;
	}

	.header__lang {
		display: none;
	}

	/* Mobile navigation */
	.header__nav--mobile {
		display: flex;
		flex-direction: column;
		position: absolute;
		top: var(--header-height);
		left: 0;
		right: 0;
		background: var(--color-bg-primary);
		border-bottom: 1px solid var(--color-border);
		padding: var(--space-4);
	}

	.hero__title {
		font-size: var(--text-3xl);
	}

	.grid--2,
	.grid--3,
	.grid--4 {
		grid-template-columns: 1fr;
	}

	.footer__grid {
		grid-template-columns: 1fr;
		gap: var(--space-8);
	}

	.footer__bottom {
		flex-direction: column;
		gap: var(--space-4);
		text-align: center;
	}

	.trust-indicators {
		gap: var(--space-8);
	}

	.timeline__item {
		grid-template-columns: 1fr;
		gap: var(--space-2);
	}

	.section-header__title {
		font-size: var(--text-3xl);
	}

	h2 {
		font-size: var(--text-3xl);
	}
}

@media (max-width: 480px) {
	.hero__cta {
		flex-direction: column;
		width: 100%;
	}

	.hero__cta .btn {
		width: 100%;
	}

	.card {
		padding: var(--space-6);
	}
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mt-16 { margin-top: var(--space-16); }

.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }
.mb-16 { margin-bottom: var(--space-16); }

.visually-hidden {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	border: 0;
}