:root {
    --bg-color: #001226;
    --accent-color: #40E0D0;
    --text-silver: #A9AFB3;
    /* Slightly more dull/sophisticated silver */
    --text-white: #BCC2C7;
    /* Dull silver instead of white */
    --font-serif: 'Playfair Display', serif;
    --font-sans: 'Montserrat', sans-serif;
    --font-jp: 'Noto Sans JP', sans-serif;
    --card-bg: rgba(255, 255, 255, 0.02);
    --transition-slow: 1.2s cubic-bezier(0.2, 0.8, 0.2, 1);
    --transition-fast: 0.3s ease;
    --depth-factor: 0;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-silver);
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
.en {
    font-family: var(--font-sans);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.logo-text,
.hero h1,
.section-title,
.loader-logo {
    font-family: var(--font-serif);
    text-transform: none;
    /* Serifs look better in mixed case */
}

/* Material Texture Overlay */
.texture-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    pointer-events: none;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* Base Fade-in for Scroll with Stagger Support */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-slow);
    transition-delay: var(--d, 0s);
    /* Supports staggered timing */
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Background Elements */
.fixed-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    overflow: hidden;
    background: var(--bg-color);
}

.mesh-gradient {
    position: absolute;
    width: 200%;
    height: 200%;
    top: -50%;
    left: -50%;
    background: radial-gradient(circle at 50% 50%, rgba(64, 224, 208, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 20% 30%, rgba(0, 119, 190, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(0, 30, 60, 0.1) 0%, transparent 50%);
    filter: blur(80px);
    animation: meshRotate 20s linear infinite;
}

@keyframes meshRotate {
    0% {
        transform: rotate(0deg) scale(1.1);
    }

    50% {
        transform: rotate(180deg) scale(1.3);
    }

    100% {
        transform: rotate(360deg) scale(1.1);
    }
}

#particles-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.particle {
    position: absolute;
    background: var(--text-white);
    border-radius: 50%;
    opacity: 0.1;
    pointer-events: none;
    animation: floatUp linear infinite;
}

@keyframes floatUp {
    0% {
        transform: translateY(100vh) scale(1);
        opacity: 0;
    }

    20% {
        opacity: 0.2;
    }

    80% {
        opacity: 0.2;
    }

    100% {
        transform: translateY(-10vh) scale(0.5);
        opacity: 0;
    }
}

/* Wavy Divider - Refined Stroke Style */
.wave-divider {
    position: relative;
    width: 100%;
    height: 80px;
    overflow: hidden;
    line-height: 0;
    pointer-events: none;
}

.wave-divider svg {
    display: block;
    width: 100%;
    height: 100%;
}

.wave-divider .shape-fill {
    fill: none;
    stroke: var(--text-silver);
    stroke-width: 0.5;
    opacity: 0.2;
}

.wave-divider.mid {
    margin: 80px 0;
}

.wave-divider.top svg {
    animation-name: waveFlowTop;
}

@keyframes waveFlowTop {
    from {
        transform: translateX(-10%) rotate(180deg);
    }

    to {
        transform: translateX(0%) rotate(180.5deg);
    }
}

/* UI: Navigation & Logo */
.nav-container {
    position: fixed;
    top: 40px;
    left: 5%;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
    color: var(--text-white);
}

.logo-svg {
    width: 80px;
    height: 30px;
    color: var(--text-white);
}

.logo-text {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 400;
    letter-spacing: 0.3em;
    text-transform: uppercase;
}

/* UI: Depth Meter */
.depth-meter {
    position: fixed;
    right: 5%;
    bottom: 50%;
    transform: translateY(50%);
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    color: rgba(191, 193, 194, 0.4);
}

.depth-value {
    font-family: 'Orbitron', sans-serif;
    /* Digital-style font */
    font-size: 1.5rem;
    /* Reduced from 2.5rem */
    font-weight: 500;
    color: var(--accent-color);
    margin: 2px 0;
    text-shadow: 0 0 10px rgba(64, 224, 208, 0.4);
    /* Digital glow */
}

/* UI: Cursor Light */
.cursor-light {
    position: fixed;
    top: 0;
    left: 0;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle at center, rgba(64, 224, 208, 0.08) 0%, transparent 70%);
    pointer-events: none;
    z-index: 999;
    transform: translate(-50%, -50%);
    transition: transform 0.1s ease-out;
}

/* Text Wobble (Water Texture) */
.wobble {
    animation: textWobble 6s ease-in-out infinite;
}

@keyframes textWobble {

    0%,
    100% {
        transform: scale(1) translateY(0);
        filter: blur(0);
    }

    33% {
        transform: scale(1.01) translateY(-1px);
        filter: blur(0.3px);
    }

    66% {
        transform: scale(0.99) translateY(1px);
        filter: blur(0.2px);
    }
}

/* UI Elements */
#loader-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #000c18;
    z-index: 10000;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 1.5s cubic-bezier(0.19, 1, 0.22, 1), visibility 1.5s;
}

#loader-wrapper.loaded {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
}

.loader-logo {
    font-size: 1.5rem;
    letter-spacing: 1.5em;
    color: var(--accent-color);
    margin-bottom: 30px;
    animation: breathingWeight 3s ease-in-out infinite;
    text-indent: 1.5em;
}

.loader-line {
    width: 0;
    height: 1px;
    background: var(--accent-color);
    margin: 0 auto;
    animation: loadingFill 2.5s cubic-bezier(0.19, 1, 0.22, 1) forwards;
}

@keyframes loadingFill {
    to {
        width: 120px;
    }
}

@keyframes breathingWeight {

    0%,
    100% {
        font-weight: 300;
        letter-spacing: 1.2em;
        opacity: 0.4;
        transform: scale(0.98);
    }

    50% {
        font-weight: 600;
        letter-spacing: 1.8em;
        opacity: 1;
        transform: scale(1.02);
    }
}

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

.hero-video-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* ユーザーから直接提供された画像（深海グリッド）を反映 */
    background: url('hero_provided.jpg');
    background-size: cover;
    background-position: center;
    z-index: 1;
    opacity: calc(0.6 - (var(--depth-factor) * 0.4));
    /* 深くなるほど薄くなる（または暗くなる） */
    filter: brightness(calc(1 - var(--depth-factor) * 0.6)) contrast(1.1);
    /* 深くなるほど暗くなる */
    transition: filter 0.3s ease, opacity 0.3s ease;
}

.hero .reveal {
    position: relative;
    z-index: 2;
    /* テキストをさらに前面に */
}

.hero h1 {
    font-family: var(--font-jp);
    font-size: clamp(1.6rem, 4vw, 2.8rem);
    /* Downsized from 3.5rem */
    line-height: 2.2;
    /* Increased for wider spacing */
    color: var(--text-white);
    margin-bottom: 2rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    /* Slightly wider tracking */
    text-shadow: 0 0 20px rgba(188, 194, 199, 0.15);
}

.hero p {
    font-size: clamp(1rem, 2vw, 1.25rem);
    font-weight: 300;
    max-width: 800px;
    color: var(--text-silver);
    opacity: 0.85;
}

.hero-subtext {
    margin-top: 2rem;
}

.brand-highlight {
    font-family: var(--font-serif) !important;
    font-size: 1.35rem;
    /* Slightly enlarged for focus */
    color: var(--accent-color);
    /* Reverted to Turquoise */
    letter-spacing: 0.5em;
    /* Wider tracking for elegance */
    text-transform: uppercase;
    display: block;
    margin: 3rem 0;
    /* Increased margin to create "focus space" */
    position: relative;
    text-shadow: 0 0 30px rgba(188, 194, 199, 0.4);
    animation: brandingShimmer 4s ease-in-out infinite;
}

/* Framing Lines to guide the eye */
.brand-highlight::before,
.brand-highlight::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 1px;
    background: var(--accent-color);
    opacity: 0.3;
    transition: width 1s ease;
}

.brand-highlight::before {
    top: -1.5rem;
}

.brand-highlight::after {
    bottom: -1rem;
}

.reveal.active .brand-highlight::before,
.reveal.active .brand-highlight::after {
    width: 100px;
    /* Expand on reveal */
}

@keyframes brandingShimmer {

    0%,
    100% {
        opacity: 0.8;
        filter: brightness(1);
    }

    50% {
        opacity: 1;
        filter: brightness(1.2) drop-shadow(0 0 10px rgba(64, 224, 208, 0.2));
    }
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-silver);
    opacity: 0.8;
    line-height: 2;
}

.focus-text {
    font-size: 1.8rem;
    /* Significant size increase */
    color: var(--text-white);
    font-weight: 500;
    display: inline-block;
    margin-top: 0.5rem;
    letter-spacing: 0.3em;
    text-shadow: 0 0 15px rgba(188, 194, 199, 0.4);
    /* Soft glow focus */
}

/* Portfolio Section */
.portfolio {
    padding: 100px 5%;
    max-width: 1400px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
    font-size: 0.9rem;
    color: var(--accent-color);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background: rgba(255, 255, 255, 0.02);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 3rem 2.5rem;
    border-radius: 12px;
    transition: all 0.8s cubic-bezier(0.165, 0.84, 0.44, 1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    text-align: left;
}

.card:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: var(--accent-color);
    transform: translateY(-8px) scale(1.01);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.card h3 {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    letter-spacing: 0.05em;
    margin-bottom: 15px;
    color: var(--text-white);
    text-transform: none;
}

.card .tagline {
    font-family: var(--font-sans);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.3em;
    color: var(--accent-color);
    margin-bottom: 1rem;
    display: block;
    opacity: 0.9;
}

.card p {
    font-size: 0.9rem;
    line-height: 1.8;
    color: var(--text-silver);
    opacity: 0.8;
}

.card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
    opacity: 0;
    transition: var(--transition-fast);
}

.card:hover::after {
    opacity: 1;
}

/* Vision Section */
.vision {
    padding: 150px 10%;
    text-align: center;
}

.vision-text {
    font-size: clamp(1.1rem, 2.2vw, 1.5rem);
    /* Reduced from 2.5rem for a more quiet feel */
    font-weight: 300;
    line-height: 2.2;
    /* Increased for better breathing room */
    color: var(--text-silver);
    letter-spacing: 0.08em;
}

/* Profile & Contact */
.profile {
    padding: 100px 5%;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.profile-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 100px;
    max-width: 1200px;
    margin: 0 auto;
}

.dl-list dt {
    color: var(--accent-color);
    font-size: 0.8rem;
    margin-bottom: 5px;
    text-transform: uppercase;
}

.dl-list dd {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--text-silver);
    color: var(--text-white);
    padding: 10px 0;
    font-family: inherit;
    font-size: 1rem;
    outline: none;
}

.contact-form input:focus {
    border-bottom-color: var(--accent-color);
}

.btn {
    align-self: flex-start;
    padding: 15px 40px;
    border: 1px solid var(--text-silver);
    background: transparent;
    color: var(--text-white);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn:hover {
    background: var(--text-white);
    color: var(--bg-color);
}

footer {
    text-align: center;
    padding: 40px;
    font-size: 0.75rem;
    opacity: 0.5;
}

@media (max-width: 900px) {
    .profile-grid {
        grid-template-columns: 1fr;
        gap: 60px;
    }
}