:root {
    /* Colors - Old (古) */
    --color-old-bg: #1f2036;
    /* Deep Indigo */
    --color-old-text: #f0f0f0;
    --color-old-accent: #b22222;
    /* Vermilion */

    /* Colors - Now (今) */
    --color-now-bg: #ffffff;
    --color-now-text: #333333;
    --color-now-accent: #00ffff;
    /* Cyan */

    /* Fonts */
    --font-old: 'Shippori Mincho', serif;
    --font-now: 'Shippori Mincho', sans-serif;

    /* Global */
    --bg-color: var(--color-old-bg);
    --text-color: var(--color-old-text);
    --accent-color: var(--color-old-accent);
    --transition-speed: 0.5s;
}

[data-theme="now"] {
    --bg-color: var(--color-now-bg);
    --text-color: var(--color-now-text);
    --accent-color: var(--color-now-accent);
}

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

body {
    font-family: var(--font-now);
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow-x: hidden;
    line-height: 1.6;
}

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

a:hover {
    opacity: 0.7;
}

ul {
    list-style: none;
}

/* Cursor Follower */
.cursor-follower {
    position: fixed;
    width: 20px;
    height: 20px;
    background-color: var(--accent-color);
    border-radius: 50%;
    pointer-events: none;
    transform: translate(-50%, -50%);
    mix-blend-mode: difference;
    z-index: 9999;
    transition: transform 0.1s;
}

/* Header */
.site-header {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    mix-blend-mode: difference;
    color: #fff;
}

.logo {
    font-family: var(--font-old);
    font-size: 1.5rem;
    font-weight: bold;
}

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

nav ul li a {
    font-size: 0.9rem;
    letter-spacing: 1px;
    text-transform: uppercase;
}

#theme-toggle {
    background: none;
    border: 2px solid currentColor;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    color: inherit;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Hero Section */
.hero-section {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    text-align: center;
}

.hero-content {
    width: 80%;
    max-width: 600px;
    margin: 0 auto;
}

.hero-logo-container {
    width: 100%;
    /* max-width: 1200px; */
    margin-bottom: 20px;
}

.hero-logo {
    width: 100%;
    height: auto;
    display: block;
}

/* Default: Show name-bl, Hide name-wh */
.main-logo {
    display: block;
}

.alt-logo {
    display: none;
}

/* Theme 'Now': Show name-wh, Hide name-bl */
[data-theme="now"] .main-logo {
    display: none;
}

[data-theme="now"] .alt-logo {
    display: block;
}

.hero-subtitle {
    margin-top: 20px;
    font-size: 1.2rem;
    letter-spacing: 0.2rem;
    opacity: 0.8;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    font-size: 0.8rem;
    letter-spacing: 2px;
}

.scroll-indicator .line {
    width: 1px;
    height: 60px;
    background-color: var(--text-color);
    animation: scrollLine 2s infinite;
}

@keyframes scrollLine {
    0% {
        transform: scaleY(0);
        transform-origin: top;
    }

    50% {
        transform: scaleY(1);
        transform-origin: top;
    }

    51% {
        transform: scaleY(1);
        transform-origin: bottom;
    }

    100% {
        transform: scaleY(0);
        transform-origin: bottom;
    }
}

/* Concept Section */
.section {
    padding: 100px 5%;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

.concept-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.concept-text h2 {
    font-size: 2rem;
    margin-bottom: 20px;
}

.old-text {
    font-family: var(--font-old);
    text-align: left;
    writing-mode: vertical-rl;
    margin-left: auto;
}

.old-text h2 {
    color: var(--color-old-accent);
}

.now-text {
    font-family: var(--font-now);
    text-align: left;
}

.now-text h2 {
    color: var(--color-now-accent);
}

.visual-circle {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--color-old-accent), var(--color-now-accent));
    margin: 0 auto;
    filter: blur(20px);
    opacity: 0.8;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-20px);
    }
}

/* Works Section */
.section-title {
    font-size: 3rem;
    text-align: center;
    margin-bottom: 80px;
    font-family: var(--font-now);
}

.works-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.work-card {
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.05);
    transition: transform 0.3s;
    cursor: pointer;
}

.work-card:hover {
    transform: translateY(-10px);
}

.work-image-placeholder {
    width: 100%;
    height: 200px;
    background-color: #333;
}

.work-info {
    padding: 20px;
}

.work-info h3 {
    font-family: var(--font-now);
    margin-bottom: 10px;
}

.work-info p {
    font-family: var(--font-old);
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Contact Section */
.contact-section {
    text-align: center;
}

.contact-message {
    font-family: var(--font-old);
    font-size: 1.5rem;
    margin-bottom: 40px;
}

.contact-button {
    display: inline-block;
    padding: 15px 40px;
    border: 1px solid var(--text-color);
    font-family: var(--font-now);
    letter-spacing: 2px;
    text-transform: uppercase;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.contact-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background-color: var(--text-color);
    z-index: -1;
    transition: width 0.3s;
}

.contact-button:hover::before {
    width: 100%;
}

.contact-button:hover {
    color: var(--bg-color);
}

/* Footer */
.site-footer {
    padding: 40px;
    text-align: center;
    font-size: 0.8rem;
    opacity: 0.5;
}

/* Responsive */
/* Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 25px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 200;
}

.menu-toggle span {
    width: 100%;
    height: 3px;
    background: var(--color-old-text);
    transition: all 0.3s linear;
}

@media (max-width: 768px) {
    .site-header {
        padding: 20px;
    }

    .menu-toggle {
        display: flex;
    }

    #site-nav {
        position: fixed;
        top: 0;
        right: 0;
        width: 100%;
        height: 100vh;
        background: var(--color-old-bg);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transform: translateX(100%);
        transition: transform 0.3s ease-in-out;
        z-index: 1000;
    }

    #site-nav.nav-open {
        transform: translateX(0);
    }

    /* When menu is open, disable mix-blend-mode on header so the menu background is solid */
    .site-header.menu-open {
        mix-blend-mode: normal;
    }

    #site-nav ul {
        flex-direction: column;
        align-items: center;
        gap: 40px;
    }

    #site-nav ul li a {
        font-size: 1.5rem;
    }

    .hero-title {
        font-size: 15vw;
    }

    .concept-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .old-text {
        writing-mode: horizontal-tb;
        text-align: center;
        margin: 0 auto;
    }

    .now-text {
        text-align: center;
    }
}