/* ===== CSS Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* ===== CSS Variables ===== */
:root {
    --bg-color: #F5F3EF;
    --text-color: #4a4a4a;
    --text-muted: #888;
    --link-color: #999999;
    --font-family: 'JetBrains Mono', 'Courier New', Courier, monospace;
    --max-width: 700px;
    --spacing-unit: 1.5rem;
}

/* ===== Body & Typography ===== */
html {
    font-size: 15px;
}

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-color);
    background-color: var(--bg-color);
    min-height: 100vh;
    padding: calc(var(--spacing-unit) * 2);
    padding-top: calc(var(--spacing-unit) * 4);
}

/* ===== Language Toggle ===== */
.lang-toggle {
    position: fixed;
    top: var(--spacing-unit);
    right: var(--spacing-unit);
    font-size: 0.85rem;
    z-index: 100;
}

.lang-btn {
    background: none;
    border: none;
    font-family: var(--font-family);
    font-size: 0.85rem;
    color: var(--link-color);
    cursor: pointer;
    padding: 0;
    transition: color 0.2s ease;
}

.lang-btn:hover {
    opacity: 0.7;
}

.lang-btn.active {
    color: var(--text-color);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.lang-separator {
    color: var(--text-color);
    user-select: none;
}

/* ===== Navigation ===== */
.nav {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.nav-link {
    background: none;
    border: none;
    font-family: var(--font-family);
    font-size: 1rem;
    color: var(--link-color);
    cursor: pointer;
    padding: 0;
    transition: color 0.2s ease;
}

.nav-link:hover {
    opacity: 0.7;
}

.nav-link.active {
    color: var(--text-color);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.nav-separator {
    color: var(--text-color);
    user-select: none;
    margin: 0;
}

/* ===== Main Content ===== */
.content {
    max-width: var(--max-width);
    margin: 0 auto;
}

/* ===== Page Title ===== */
.page-title {
    font-size: 2.2rem;
    font-weight: 400;
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--text-color);
    text-align: center;
}

/* ===== Sections ===== */
.section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.section.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-content p {
    margin-bottom: var(--spacing-unit);
}

.section-content p:last-child {
    margin-bottom: 0;
}

/* ===== Links ===== */
a {
    color: var(--link-color);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

a:hover {
    opacity: 0.7;
}

/* ===== Contact Link ===== */
.contact {
    margin-top: calc(var(--spacing-unit) * 2);
}

/* ===== Explorations Section ===== */
.explorations-intro {
    margin-bottom: calc(var(--spacing-unit) * 2);
}

/* ===== Raindrop Embed ===== */
.raindrop-embed {
    margin-top: var(--spacing-unit);
}

.raindrop-embed iframe {
    border: none;
    width: 100%;
    min-height: 600px;
    border-radius: 4px;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    body {
        padding: var(--spacing-unit);
        padding-top: calc(var(--spacing-unit) * 3.5);
    }
    
    .lang-toggle {
        top: calc(var(--spacing-unit) * 0.75);
        right: calc(var(--spacing-unit) * 0.75);
    }
    
    .nav {
        margin-bottom: calc(var(--spacing-unit) * 2);
    }
    
    .nav-link {
        padding: 0;
    }
    
    .page-title {
        font-size: 1.8rem;
    }
    
    .raindrop-embed iframe {
        min-height: 400px;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 13px;
    }
    
    body {
        padding: 1rem;
        padding-top: 3rem;
    }
    
    .lang-toggle {
        top: 0.75rem;
        right: 0.75rem;
        font-size: 0.8rem;
    }
    
    .lang-btn {
        font-size: 0.8rem;
        padding: 0;
    }
    
    .nav {
        margin-bottom: 1.5rem;
    }
    
    .nav-link {
        font-size: 0.85rem;
        padding: 0;
    }
    
    .nav-separator {
        margin: 0;
    }
    
    .page-title {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }
    
    .section-content p {
        margin-bottom: 1rem;
        text-align: justify;
        hyphens: auto;
        -webkit-hyphens: auto;
        word-break: break-word;
    }
    
    .raindrop-embed {
        margin-top: 0.5rem;
        margin-left: -1rem;
        margin-right: -1rem;
        width: calc(100% + 2rem);
    }
    
    .raindrop-embed iframe {
        min-height: 350px;
        border-radius: 0;
    }
}

/* ===== Print Styles ===== */
@media print {
    .lang-toggle,
    .nav {
        display: none;
    }
    
    .section {
        display: block !important;
        page-break-inside: avoid;
    }
    
    body {
        background: white;
        padding: 0;
    }
}