/* Base Styles */
:root {
    --bg-color: #ffffff;
    --text-color: #111111;
    --text-muted: #888888;
    --accent-color: #000000;
    --transition-speed: 0.6s;
    --font-en: 'Inter', sans-serif;
    --font-jp: 'Noto Sans JP', sans-serif;
}

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

body {
    font-family: var(--font-en), var(--font-jp);
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow-x: hidden;
    line-height: 1.6;
    letter-spacing: 0.05em;
    font-weight: 300;
}

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

a:hover {
    opacity: 0.5;
}

/* Background Video */
#video-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100vw;
    height: 100vh;
    z-index: -1;
    display: flex;
    justify-content: center;
    align-items: center;
    pointer-events: none;
    opacity: 0.15; /* Subtle background presence */
    transition: opacity var(--transition-speed) ease;
}

#bg-video {
    width: 60%;
    max-width: 600px;
    height: auto;
    object-fit: contain;
}

/* Header & Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 2rem 4rem;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    z-index: 100;
}

.nav {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    justify-content: flex-start;
    height: 30px;
    max-width: 30px;
    min-width: 30px;
    padding: 0;
    overflow: hidden;
    color: transparent;
    transition: max-width 0.5s cubic-bezier(0.16, 1, 0.3, 1), padding 0.5s cubic-bezier(0.16, 1, 0.3, 1), color 0.3s;
    border-radius: 0;
    text-decoration: none;
    box-sizing: border-box;
    font-size: 0.85rem;
    letter-spacing: 0.15em;
    white-space: nowrap;
}

.nav-link span {
    display: inline-block;
    transform: translateX(20px);
    opacity: 0;
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.5s;
}

.nav-link:hover {
    max-width: 250px;
    padding: 0 1rem;
    color: #fff;
    opacity: 1;
}

.nav-link:hover span {
    transform: translateX(0);
    opacity: 1;
}

#nav-home { background-color: #3b82f6; }
#nav-bio { background-color: #ef4444; }
#nav-music { background-color: #22c55e; }
#nav-portfolio { background-color: #eab308; }

/* Main Content Area */
#main-content {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow-y: auto;
    scroll-behavior: smooth;
}

.page-section {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    min-height: 100vh;
    padding: 8rem 4rem 4rem;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-speed) ease, visibility var(--transition-speed) ease;
    display: flex;
    flex-direction: column;
}

.page-section.active {
    opacity: 1;
    visibility: visible;
    position: relative;
}

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

.section-title {
    font-size: 1rem;
    font-weight: 400;
    letter-spacing: 0.2em;
    margin-bottom: 4rem;
    text-transform: uppercase;
    color: var(--text-muted);
}

/* Home Section */
#home {
    justify-content: center;
    align-items: center;
}

#rain-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 0;
}

/* Rain Sound Toggle */
.sound-toggle {
    position: fixed;
    right: 3.5rem;
    top: 2rem;
    background: transparent;
    border: none;
    padding: 0.5rem;
    color: var(--text-muted);
    cursor: pointer;
    z-index: 1000;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sound-toggle:hover {
    color: var(--text-color);
}

.sound-toggle.active {
    color: var(--text-color);
}

.home-text {
    text-align: center;
    margin-top: 15vh;
}

.home-text h1 {
    font-size: 3rem;
    font-weight: 300;
    letter-spacing: 0.3em;
    margin-bottom: 1rem;
}

.home-text p {
    font-size: 0.9rem;
    color: var(--text-muted);
    letter-spacing: 0.2em;
}

/* Biography Section */
.bio-layout {
    display: flex;
    gap: 6rem;
    align-items: center;
}

.bio-image {
    flex: 1;
    border-radius: 4px;
    overflow: hidden;
}

.bio-image img {
    width: 100%;
    height: auto;
    object-fit: cover;
    filter: grayscale(100%) contrast(1.2);
    transition: filter 0.5s ease;
}

.bio-image img:hover {
    filter: grayscale(0%) contrast(1);
}

.bio-text {
    flex: 1;
}

.bio-name {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    letter-spacing: 0.1em;
}

.bio-jp, .bio-en {
    font-size: 0.85rem;
    line-height: 1.9;
    margin-bottom: 2.5rem;
    text-align: justify;
}

.bio-jp p, .bio-en p {
    margin-bottom: 1.2rem;
}

.bio-social {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
}

.bio-link {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    border-bottom: 1px solid var(--text-color);
    padding-bottom: 2px;
}

/* Music Section */
.music-layout {
    display: flex;
    gap: 6rem;
}

.music-layout h3 {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    margin-bottom: 2rem;
    border-bottom: 1px solid #eee;
    padding-bottom: 1rem;
}

.streaming-links {
    flex: 1;
}

.streaming-links ul {
    list-style: none;
}

.streaming-links li {
    margin-bottom: 1.5rem;
}

.streaming-links a {
    font-size: 1.5rem;
    font-weight: 300;
    display: inline-block;
}

.unreleased-demos {
    flex: 2;
    margin-bottom: 2rem;
}

.unreleased-demos h3 {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    margin-bottom: 2rem;
    border-bottom: 1px solid #eee;
    padding-bottom: 1rem;
}

.video-embed {
    flex: 2;
}

.video-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.iframe-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    height: 0;
}

.iframe-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 4px;
}

.demo-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.demo-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 0.5rem 0;
    cursor: pointer;
    transition: opacity 0.3s ease;
}

.demo-item:hover {
    opacity: 0.5;
}

.demo-item img {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: 2px;
}

.demo-info {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.demo-title {
    font-weight: 500;
}

.demo-play-btn {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

/* Portfolio Section */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.portfolio-item {
    position: relative;
    overflow: hidden;
    aspect-ratio: 1 / 1;
    border-radius: 4px;
    cursor: pointer;
}

.portfolio-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s ease;
}

.portfolio-item:hover img {
    transform: scale(1.05);
}

.portfolio-item .overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.portfolio-item:hover .overlay {
    opacity: 1;
}

.overlay p {
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    font-weight: 500;
}

/* Lightbox */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.lightbox.active {
    opacity: 1;
    pointer-events: auto;
}

.lightbox img {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
    border-radius: 4px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.lightbox.active img {
    transform: scale(1);
}

.lightbox-close {
    position: absolute;
    top: 2rem;
    right: 3rem;
    color: #fff;
    font-size: 2.5rem;
    cursor: pointer;
    font-weight: 300;
    transition: opacity 0.3s;
}

.lightbox-close:hover {
    opacity: 0.5;
}

/* Animations */
.fade-in {
    animation: fadeIn var(--transition-speed) ease forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Player */
#audio-player {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: var(--bg-color);
    border-top: 1px solid #eee;
    padding: 1.5rem 4rem;
    z-index: 200;
    transform: translateY(100%);
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

#audio-visualizer {
    position: absolute;
    top: -60px;
    left: 0;
    width: 100%;
    height: 60px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.5s ease;
    z-index: -1;
}

#audio-player.player-visible #audio-visualizer {
    opacity: 1;
}

#audio-player.player-visible {
    transform: translateY(0);
}

.player-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.player-info {
    display: flex;
    flex-direction: column;
}

#player-status {
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 0.1em;
    margin-bottom: 0.2rem;
}

#player-track-name {
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 0.05em;
}

.player-buttons button {
    background: none;
    border: none;
    font-family: inherit;
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    cursor: pointer;
    margin-left: 2rem;
    color: var(--text-color);
    transition: opacity 0.3s ease;
}

.player-buttons button:hover {
    opacity: 0.5;
}

.progress-bar-container {
    width: 100%;
    height: 2px;
    background-color: #eee;
    cursor: pointer;
    position: relative;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background-color: var(--text-color);
    transition: width 0.1s linear;
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        padding: 1.5rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .sound-toggle {
        top: 1.5rem;
        right: 1.5rem;
    }

    .nav {
        gap: 0.8rem;
        flex-wrap: wrap;
    }

    .nav-link:hover, .nav-link:active {
        max-width: 180px;
    }

    .page-section {
        padding: 8rem 1.5rem 4rem;
    }

    .bio-layout, .music-layout {
        flex-direction: column;
        gap: 2.5rem;
    }

    .demo-list {
        grid-template-columns: 1fr !important;
    }

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

    #bg-video {
        width: 90%;
    }

    #audio-player {
        padding: 1rem 1.5rem;
    }
}