:root {
    --bg-color: #000000;
    --text-color: #ffffff;
    --text-muted: #cccccc;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-blur: 10px;
    --font-main: 'Inter', 'Noto Sans JP', sans-serif;
    --section-spacing: 40px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    line-height: 1.8;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

ul {
    list-style: none;
}

/* Background Animation - Monochrome Gradients */
.background-globes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.globe {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.15;
    /* Subtle white glow */
    animation: float 20s infinite alternate ease-in-out;
    background: radial-gradient(circle, #ffffff, transparent);
}

.globe-1 {
    width: 600px;
    height: 600px;
    top: -150px;
    left: -150px;
}

.globe-2 {
    width: 700px;
    height: 700px;
    bottom: -150px;
    right: -150px;
    animation-delay: -5s;
}

.globe-3 {
    width: 400px;
    height: 400px;
    top: 30%;
    left: 40%;
    animation-delay: -10s;
    opacity: 0.1;
}

@keyframes float {
    0% {
        transform: translate(0, 0);
    }

    100% {
        transform: translate(30px, 30px);
    }

    100% {
        transform: translate(30px, 30px);
    }

    100% {
        transform: translate(30px, 30px);
    }
}

/* Realistic Lightning Effect */
#lightning-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 0;
    /* Behind content but above background. If z-index is issue, we can use mixed blend mode on top */
    z-index: 1;
    /* Low z-index to be behind 'proper' content if possible, or overlay */
    mix-blend-mode: screen;
    overflow: hidden;
}

.lightning-bolt {
    position: absolute;
    top: -50px;
    /* Start slightly above */
    width: 300px;
    height: 100vh;
    opacity: 0;
    filter: drop-shadow(0 0 15px rgba(200, 230, 255, 0.8));
}

.lightning-bolt path {
    stroke: rgba(220, 240, 255, 0.6);
    stroke-width: 2;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.flash-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #fff;
    opacity: 0;
    pointer-events: none;
    mix-blend-mode: overlay;
    z-index: 2;
}

/* Subtle animation classes */
.anim-bolt {
    animation: bolt-flicker 0.4s linear forwards;
}

.anim-flash {
    animation: ambient-flash 0.6s ease-out forwards;
}

@keyframes bolt-flicker {
    0% {
        opacity: 0;
    }

    10% {
        opacity: 0.4;
    }

    20% {
        opacity: 0;
    }

    30% {
        opacity: 0.3;
    }

    50% {
        opacity: 0.1;
    }

    60% {
        opacity: 0.4;
    }

    100% {
        opacity: 0;
    }
}

@keyframes ambient-flash {
    0% {
        opacity: 0;
    }

    10% {
        opacity: 0.08;
    }

    /* Very subtle background lift */
    30% {
        opacity: 0.04;
    }

    100% {
        opacity: 0;
    }
}

/* Layout */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: var(--section-spacing) 0;
    opacity: 0;
    /* JS Animation trigger */
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 20px;
    color: #fff;
    letter-spacing: -1px;
    border-bottom: 1px solid #333;
    padding-bottom: 10px;
    display: inline-block;
}

.subsection-title {
    font-size: 1.5rem;
    color: #fff;
    margin-bottom: 20px;
    margin-top: 20px;
    line-height: 1.2;
    letter-spacing: 2px;
    border-left: 3px solid #fff;
    padding-left: 15px;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 20px 0;
    z-index: 100;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 800;
    font-size: 1.5rem;
    letter-spacing: 1px;
    color: #fff;
}

.nav ul {
    display: flex;
    gap: 30px;
}

.nav a {
    font-size: 0.9rem;
    font-weight: 500;
    color: #888;
}

.nav a:hover {
    color: #fff;
}

/* Hero */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    padding: 0;
}

.hero-title {
    font-size: 5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
    color: #fff;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

.hero-subtitle {
    font-size: 1.2rem;
    color: #ccc;
    letter-spacing: 4px;
    text-transform: uppercase;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.8rem;
    letter-spacing: 3px;
    color: #888;
    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);
    }
}

/* Cards & Content */
.glass-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid #333;
    padding: 30px;
    border-radius: 0;
    /* Sharper edges for monochrome feel */
    transition: all 0.3s ease;
}

.glass-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: #fff;
    transform: translateY(-5px);
}

.text-content {
    color: #ccc;
    font-size: 1rem;
}

/* Business Section */
.business-group {
    margin-bottom: 60px;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.card-title {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: #fff;
}

.card-desc {
    color: #aaa;
    margin-bottom: 30px;
    font-size: 0.95rem;
}

.platform-list {
    margin: 20px 0;
    font-size: 0.9rem;
    color: #aaa;
}

.platform-list ul {
    display: inline-flex;
    gap: 15px;
    margin-left: 10px;
}

.platform-list li {
    position: relative;
}

.platform-list li:not(:last-child)::after {
    content: '/';
    position: absolute;
    right: -10px;
    color: #555;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

.primary-btn {
    background: transparent;
    color: #fff;
    border: 1px solid #555;
}

.primary-btn:hover {
    background: #fff;
    color: #000;
    border-color: #fff;
}

.secondary-btn {
    background: transparent;
    border: 1px solid #555;
    color: #fff;
}

.secondary-btn:hover {
    border-color: #fff;
    background: #fff;
    color: #000;
}

/* Footer */
.footer {
    padding: 50px 0;
    text-align: center;
    border-top: 1px solid #222;
    color: #555;
    font-size: 0.8rem;
    background: #000;
}

.btn-group {
    display: flex;
    gap: 15px;
    margin-top: 30px;
    flex-wrap: wrap;
}

/* Responsive */
@media (max-width: 768px) {
    .section-title {
        font-size: 2.2rem;
    }

    .hero-title {
        font-size: 3rem;
    }

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

    .nav {
        display: none;
    }
}

/* Icon Buttons */
.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    aspect-ratio: 1 / 1;
    /* Force square aspect ratio */
    padding: 0;
    border-radius: 0;
    /* Square border */
    background: transparent;
    color: #fff;
    border: 1px solid #555;
    transition: all 0.3s ease;
}

.btn-icon:hover {
    background: #fff;
    color: #000;
    border-color: #fff;
    transform: translateY(-3px);
}

.btn-icon svg {
    width: 22px;
    /* Slightly larger for visibility */
    height: 22px;
    /* Ensure aspect ratio is preserved */
    min-width: 22px;
    min-height: 22px;
    object-fit: contain;
}

.btn-icon img {
    /* Support for IMG tags if used */
    width: 22px;
    height: 22px;
    object-fit: contain;
    /* No filter by default - respects original white image quality */
    transition: all 0.3s ease;
}

.btn-icon:hover img {
    filter: brightness(0);
    /* Turn White image to Black on hover */
}