:root {
    --shiro: #fafaf8;
    --sumi: #1a1a1a;
    --ai: #1e3a5f;
    --ai-light: #2a5a8f;
    --ai-glow: rgba(30, 58, 95, 0.15);
    --nezumi: #64748b;
    --gin: #94a3b8;
    --sen: #cbd5e1;
    --glass-bg: rgba(255, 255, 255, 0.6);
    --glass-border: rgba(255, 255, 255, 0.3);

    --font-heading: 'Shippori Mincho', serif;
    --font-body: 'Karla', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
}

::selection {
    background: var(--ai);
    color: var(--shiro);
}

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

html {
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--shiro);
    color: var(--sumi);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    cursor: none;
    background-image:
        radial-gradient(circle at 0% 0%, rgba(30, 58, 95, 0.04) 0%, transparent 50%),
        radial-gradient(circle at 100% 100%, rgba(30, 58, 95, 0.04) 0%, transparent 50%);
    background-attachment: fixed;
}

body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.5;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%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)' opacity='0.1'/%3E%3C/svg%3E");
    mix-blend-mode: multiply;
}

/* Custom Cursor */
.cursor-dot {
    position: fixed;
    width: 6px;
    height: 6px;
    background: var(--ai);
    border-radius: 50%;
    pointer-events: none;
    z-index: 10001;
    transition: transform 0.1s ease;
    transform: translate(-50%, -50%);
}

.cursor-ring {
    position: fixed;
    width: 36px;
    height: 36px;
    border: 1.5px solid var(--ai);
    border-radius: 50%;
    pointer-events: none;
    z-index: 10000;
    transition: width 0.3s ease, height 0.3s ease, border-color 0.3s ease, transform 0.15s ease;
    transform: translate(-50%, -50%);
    opacity: 0.5;
}

.cursor-ring.hover {
    width: 56px;
    height: 56px;
    border-color: var(--ai-light);
    opacity: 0.3;
}

@media (max-width: 768px) {
    .cursor-dot, .cursor-ring { display: none; }
    body { cursor: auto; }
}

/* Vertical Progress Bar */
.scroll-progress-container {
    position: fixed;
    top: 50%;
    left: 24px;
    transform: translateY(-50%);
    height: 150px;
    width: 2px;
    background-color: var(--sen);
    z-index: 1000;
    border-radius: 2px;
}

.scroll-progress-indicator {
    width: 2px;
    background: linear-gradient(to bottom, var(--ai), var(--ai-light));
    height: 20%;
    position: absolute;
    top: 0;
    left: 0;
    border-radius: 2px;
    transition: height 0.4s ease-out;
}

@media (max-width: 768px) {
    .scroll-progress-container {
        display: none;
    }
}

/* Section Navigation Dots */
.section-nav {
    position: fixed;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 14px;
    z-index: 1000;
}

.nav-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--sen);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.nav-dot::before {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    border: 1px solid transparent;
    transition: border-color 0.3s ease;
}

.nav-dot.active {
    background: var(--ai);
    transform: scale(1.3);
}

.nav-dot.active::before {
    border-color: var(--ai-glow);
}

@media (max-width: 768px) {
    .section-nav {
        display: none;
    }
}

/* Typing Effect */
.name-line {
    font-size: clamp(1.5rem, 4vw, 3rem);
    color: var(--ai);
    font-weight: 400;
}

.typing-name {
    display: inline;
    border-right: 2px solid var(--ai);
    padding-right: 4px;
    animation: blinkCursor 0.8s step-end infinite;
}

.typing-name.done {
    border-right: none;
    padding-right: 0;
    animation: none;
}

@keyframes blinkCursor {
    0%, 100% { border-color: transparent; }
    50% { border-color: var(--ai); }
}

/* Scroll Snap Sections */
section {
    height: 100vh;
    height: 100dvh;
    width: 100%;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: var(--spacing-md);
}

.container {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
}

h1, h2, h3 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
}

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

/* ========== HERO ========== */
#hero {
    text-align: center;
    overflow: hidden;
}

#particles-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.hero-enso {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: clamp(300px, 50vw, 550px);
    height: clamp(300px, 50vw, 550px);
    border-radius: 50%;
    border: 2px solid rgba(30, 58, 95, 0.06);
    z-index: 0;
    animation: ensoRotate 60s linear infinite;
}

.hero-enso::after {
    content: '';
    position: absolute;
    top: -2px;
    left: 15%;
    width: 60%;
    height: 2px;
    background: linear-gradient(to right, transparent, var(--ai-glow), transparent);
    animation: ensoGlow 4s ease-in-out infinite;
}

@keyframes ensoRotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes ensoGlow {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.8; }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    margin-bottom: var(--spacing-md);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #22c55e;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4); }
    50% { box-shadow: 0 0 0 6px rgba(34, 197, 94, 0); }
}

.status-text {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--nezumi);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.hero-content h1 {
    font-size: clamp(3rem, 8vw, 6rem);
    color: var(--sumi);
    margin-bottom: 0.5rem;
}

.hero-content h2 {
    font-size: clamp(1.5rem, 4vw, 3rem);
    color: var(--ai);
    font-weight: 400;
}

.divider {
    width: 60px;
    height: 2px;
    background: linear-gradient(to right, transparent, var(--ai), transparent);
    margin: var(--spacing-md) auto;
}

.subtitle {
    font-family: var(--font-mono);
    color: var(--nezumi);
    font-size: 1.1rem;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-md);
    left: 0;
    right: 0;
    margin: 0 auto;
    width: fit-content;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--nezumi);
    z-index: 10;
}

.scroll-indicator span {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.scroll-indicator .line {
    width: 1px;
    height: 60px;
    background-color: var(--sen);
    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; }
}

/* ========== SECTION HEADER ========== */
.section-header {
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--sen);
    padding-bottom: var(--spacing-sm);
    display: flex;
    align-items: baseline;
    gap: 1rem;
}

.section-header h3 {
    font-family: var(--font-mono);
    color: var(--ai);
    font-size: 1.2rem;
}

.section-header h2 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    color: var(--sumi);
}

/* ========== ABOUT ========== */
.about-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

@media (min-width: 768px) {
    .about-layout {
        grid-template-columns: 5fr 4fr;
    }
}

.about-main h3 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.role {
    font-family: var(--font-mono);
    color: var(--ai);
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
}

.bio {
    font-size: 1.1rem;
    color: var(--nezumi);
    max-width: 600px;
    line-height: 1.8;
}

.about-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: var(--spacing-md);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.about-card:hover {
    border-color: var(--ai-glow);
    box-shadow: 0 8px 32px var(--ai-glow);
}

.school-logo-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.school-logo {
    width: 72px;
    height: 72px;
    object-fit: contain;
    position: relative;
    z-index: 1;
}

.school-logo-glow {
    position: absolute;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--ai-glow) 0%, transparent 70%);
    animation: logoGlow 3s ease-in-out infinite;
}

@keyframes logoGlow {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.2); opacity: 0.8; }
}

.card-details {
    width: 100%;
}

.detail-item {
    margin-bottom: var(--spacing-md);
    display: flex;
    flex-direction: column;
}

.detail-item:last-child {
    margin-bottom: 0;
}

.detail-item .label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--ai);
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.detail-item .value {
    font-size: 1rem;
    color: var(--sumi);
}

/* ========== SKILLS ========== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.skill-category h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    color: var(--ai);
    border-left: 2px solid var(--gin);
    padding-left: 1rem;
}

.skill-bars {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.skill-bar-item {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.skill-name {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--sumi);
}

.skill-bar {
    width: 100%;
    height: 4px;
    background: var(--sen);
    border-radius: 4px;
    overflow: hidden;
}

.skill-fill {
    height: 100%;
    width: 0;
    background: linear-gradient(to right, var(--ai), var(--ai-light));
    border-radius: 4px;
    transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.skill-fill.animated {
    width: var(--fill-width);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tag {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    padding: 0.35rem 0.85rem;
    border: 1px solid var(--sen);
    border-radius: 50px;
    color: var(--ai);
    transition: all 0.3s ease;
    cursor: none;
}

.skill-tag:hover {
    background: var(--ai);
    color: white;
    border-color: var(--ai);
    transform: translateY(-2px);
}

/* ========== PROJECTS ========== */
.projects-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.project-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.project-item {
    display: grid;
    grid-template-columns: 60px 1fr 40px;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid transparent;
    border-radius: 12px;
    cursor: none;
    align-items: center;
}

.project-link:hover .project-item {
    background: var(--glass-bg);
    border-color: var(--ai);
    transform: translateX(8px);
    box-shadow: 0 4px 24px var(--ai-glow);
}

.project-link:hover .project-content h3 {
    color: var(--ai);
}

.project-link:hover .project-arrow {
    color: var(--ai);
    transform: translateX(4px);
}

.project-year {
    font-family: var(--font-mono);
    color: var(--ai);
    font-size: 1rem;
    padding-top: 0.5rem;
}

.project-content h3 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

.tech-stack {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--ai);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.description {
    color: var(--nezumi);
    font-size: 1rem;
}

.project-arrow {
    font-size: 1.4rem;
    color: var(--sen);
    transition: all 0.3s ease;
    text-align: center;
}

/* ========== CONTACT ========== */
.contact-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-lg);
}

.contact-intro {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    color: var(--nezumi);
    margin-bottom: 0.5rem;
}

.email-link {
    font-family: var(--font-heading);
    font-size: clamp(1.5rem, 4vw, 3rem);
    color: var(--sumi);
    position: relative;
    display: inline-block;
}

.email-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background: linear-gradient(to right, var(--ai), var(--ai-light));
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.email-link:hover::after {
    width: 100%;
}

.phone {
    font-family: var(--font-mono);
    color: var(--nezumi);
    font-size: 1.2rem;
}

.social-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.social-link {
    font-family: var(--font-mono);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
    padding: 0.6rem 1.2rem;
    border: 1px solid var(--sen);
    border-radius: 8px;
    color: var(--ai);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.social-icon {
    width: 18px;
    height: 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.social-icon svg {
    width: 16px;
    height: 16px;
}

.social-link:hover {
    background: var(--ai);
    color: white;
    border-color: var(--ai);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px var(--ai-glow);
}

/* Footer */
.footer {
    margin-top: auto;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--gin);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.footer-logo {
    width: 28px;
    height: 28px;
    object-fit: contain;
    opacity: 0.5;
}

.footer-divider {
    width: 1px;
    height: 16px;
    background: var(--sen);
}

.footer-brand span {
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--gin);
}

.footer-copy {
    color: var(--gin);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 2.5rem;
    }

    .section-header {
        margin-bottom: var(--spacing-md);
    }

    .project-item {
        grid-template-columns: 40px 1fr 30px;
        gap: 0.75rem;
        padding: 1rem;
    }

    .project-content h3 {
        font-size: 1.4rem;
    }

    .about-card {
        padding: var(--spacing-sm);
    }

    .school-logo {
        width: 56px;
        height: 56px;
    }

    .social-links {
        flex-direction: column;
    }

    .social-link {
        width: 100%;
        justify-content: center;
    }

    .hero-enso {
        width: clamp(250px, 80vw, 400px);
        height: clamp(250px, 80vw, 400px);
    }
}

@media (max-width: 480px) {
    .project-item {
        grid-template-columns: 1fr;
    }

    .project-arrow {
        display: none;
    }

    .about-layout {
        grid-template-columns: 1fr;
    }
}