/* Base Reset & Variables */
:root {
    --font-main: 'Shippori Mincho', 'Yu Mincho', serif;
    --color-bg: #fdfdfd;
    --color-text: #2a2a2a;
    --color-accent: #b93a3a;
    /* Muted Red */
    --color-nav-bg: rgba(0, 0, 0, 0.75);
    --color-nav-text: #fff;
    --hero-overlay: rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: var(--font-main);
    background-color: transparent;
    /* Changed to show fixed background */
    color: var(--color-text);
    line-height: 1.8;
    overflow-x: hidden;
    opacity: 0;
    /* JS Fade-in */
    transition: opacity 1.5s ease-out;
}

body.loaded {
    opacity: 1;
}

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

/* Background Texture */
.background-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    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='0.05'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: -1;
}

/* Header (Title Overlay) */
.site-header {
    position: absolute;
    top: 5vh;
    left: 5vw;
    z-index: 10;
    text-shadow: 2px 2px 4px rgba(255, 255, 255, 0.8);
}

.site-title {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    margin-bottom: 0.2rem;
}

.site-subtitle {
    font-size: 1rem;
    letter-spacing: 0.2em;
    color: var(--color-accent);
    font-weight: bold;
}

/* Hero Section */
.hero-section {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    /* Keep nav inside */
    display: flex;
    align-items: center;
    justify-content: center;
    /* Spacer for the fixed background */
    background: transparent;
}

.hero-image-container {
    position: fixed;
    /* Fixed background */
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    /* Behind everything */
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

/* Slanted Navigation */
.slant-nav {
    position: absolute;
    bottom: 10%;
    right: 5%;
    z-index: 20;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.slant-nav ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.slant-nav li {
    position: relative;
    transform: skewX(-20deg);
    /* The Slant */
    background: var(--color-nav-bg);
    padding: 0.8rem 2.5rem;
    color: var(--color-nav-text);
    text-align: right;
    border-right: 4px solid var(--color-accent);
    transition: transform 0.3s ease, background 0.3s ease, padding-right 0.3s ease;
    cursor: pointer;
}

.slant-nav li:hover {
    background: var(--color-accent);
    padding-right: 3.5rem;
}

.slant-nav a {
    display: block;
    transform: skewX(20deg);
    /* Un-slant text */
    text-align: right;
}

.nav-en {
    display: block;
    font-family: sans-serif;
    font-weight: bold;
    font-size: 1.2rem;
    letter-spacing: 0.05em;
    line-height: 1;
}

.nav-jp {
    display: block;
    font-size: 0.8rem;
    opacity: 0.8;
    margin-top: 0.2rem;
}

/* Content Sections */
.content-section {
    padding: 6rem 10%;
    min-height: 50vh;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    z-index: 1;
    /* Glassmorphism gradient for smooth transition */
    background: linear-gradient(to bottom,
            rgba(253, 253, 253, 0) 0%,
            rgba(253, 253, 253, 0.3) 20%,
            rgba(253, 253, 253, 0.5) 100%);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    margin-top: -10vh;
    /* Overlap slightly with hero */
    padding-top: 15vh;
}

/* Reset margin top for following sections */
.content-section+.content-section {
    margin-top: 0;
    padding-top: 6rem;
    background: rgba(253, 253, 253, 0.5);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

h2 {
    font-size: 1.8rem;
    margin-bottom: 3rem;
    border-left: 5px solid var(--color-accent);
    padding-left: 1rem;
    letter-spacing: 0.1em;
}

article {
    margin-bottom: 3rem;
}

h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    font-weight: bold;
}

p {
    margin-bottom: 1.5rem;
    text-align: justify;
}

.log-list {
    list-style: none;
    border-top: 1px solid #ddd;
}

.log-list li {
    padding: 1rem 0;
    border-bottom: 1px solid #ddd;
    display: flex;
    gap: 2rem;
}

.date {
    font-family: monospace;
    color: #666;
}

/* Footer */
.site-footer {
    padding: 2rem;
    text-align: center;
    background: #111;
    color: #fff;
    font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 768px) {
    .site-title {
        font-size: 2rem;
    }

    .slant-nav {
        right: 0;
        bottom: 5%;
    }

    .slant-nav li {
        padding: 0.8rem 1.5rem;
    }

    .content-section {
        padding: 4rem 5%;
    }
}