:root {
    /* Color Palette - Water Element & Japanese Minimalist */
    --shiro: #fafaf8;      /* Warm White */
    --sumi: #1a1a1a;       /* Ink Black */
    --ai: #1e3a5f;         /* Indigo (Accent) */
    --nezumi: #64748b;     /* Slate Gray */
    --gin: #94a3b8;        /* Silver */
    --sen: #cbd5e1;        /* Line Color */
    
    /* Typography */
    --font-heading: 'Shippori Mincho', serif;
    --font-body: 'Karla', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
}

* {
    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;
    
    /* Water Flow Background Effect */
    background-image: 
        radial-gradient(circle at 0% 0%, rgba(30, 58, 95, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 100% 100%, rgba(30, 58, 95, 0.05) 0%, transparent 50%);
    background-attachment: fixed;
}

/* Washi Paper Texture Overlay - Fixed Encoding */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.6; /* Increased opacity slightly */
    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; /* Better blend mode for paper effect */
}

/* Vertical Progress Bar */
.scroll-progress-container {
    position: fixed;
    top: 50%;
    left: 20px;
    transform: translateY(-50%);
    height: 150px;
    width: 2px;
    background-color: var(--sen);
    z-index: 1000;
}

.scroll-progress-indicator {
    width: 2px;
    background-color: var(--ai);
    height: 20%;
    position: absolute;
    top: 0;
    left: 0;
    transition: height 0.4s ease-out;
}

/* Hide progress bar on mobile */
@media (max-width: 768px) {
    .scroll-progress-container {
        display: none;
    }
}

/* Typing Effect for Name */
.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; /* Mobile viewport fix */
    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;
}

/* Typography Utilities */
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;
}

/* Page 1: Hero */
#hero {
    text-align: center;
}

.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-color: var(--ai);
    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; }
}

/* Shared Section Styles */
.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);
}

/* Page 2: About */
.content-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

@media (min-width: 768px) {
    .content-grid {
        grid-template-columns: 2fr 1fr;
    }
}

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

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

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

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

.detail-item .label {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--ai);
    margin-bottom: 0.25rem;
    text-transform: uppercase;
}

.detail-item .value {
    font-size: 1.1rem;
}

/* Page 3: 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-list {
    list-style: none;
}

.skill-list li {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    color: var(--sumi);
}

.skill-list.mono {
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

/* Page 4: Projects */
.projects-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

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

.project-item {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    transition: all 0.3s ease;
    border: 1px solid transparent;
    cursor: pointer;
}

.project-link:hover .project-item {
    background-color: white;
    border-color: var(--ai);
    transform: translateX(8px);
}

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

.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;
}

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

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

/* Page 5: Contact */
.contact-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-lg);
}

.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-color: var(--ai);
    transition: width 0.3s ease;
}

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

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

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-link {
    font-family: var(--font-mono);
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 1px;
    padding: 0.5rem 1rem;
    border: 1px solid var(--sen);
    color: var(--ai);
}

.social-link:hover {
    background-color: var(--ai);
    color: white;
    border-color: var(--ai);
}

.footer {
    margin-top: auto;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--gin);
}

/* Responsive Adjustments */
@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: 1fr;
        gap: 0.5rem;
        padding: 1rem;
    }
}