:root {
    --bg-page: #fcfcfd;
    --bg-header: #f8fafc;
    --bg-card: #ffffff;
    --accent: #8e44ad;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --border: #e2e8f0;
    --terminal-green: #059669;
    --font-main: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

html {
    scrollbar-gutter: stable;
}

body {
    background-color: var(--bg-page);
    color: var(--text-primary);
    font-family: var(--font-main);
    margin: 0;
    padding: 0;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Header & Prompt styles */
.terminal-header {
    border-bottom: 1px solid var(--border);
    padding: 2.5rem 1.5rem 2rem 1.5rem;
    background: linear-gradient(to bottom, #fff 0%, var(--bg-header) 100%);
    position: relative;
}

.header-container {
    max-width: 850px;
    margin: 0 auto;
    text-align: left;
}

.terminal-prompt {
    font-family: var(--font-mono);
    color: var(--terminal-green);
    margin-top: 1.5rem;
    font-size: 0.85rem;
    font-weight: 700;
}

h1 {
    font-family: var(--font-main);
    font-size: clamp(2rem, 4vw, 2.5rem);
    margin: 0.5rem 0 0 0;
    font-weight: 700;
    letter-spacing: -0.03em;
}

h1 a {
    text-decoration: none;
    color: inherit;
}

h1 a:hover {
    color: var(--accent);
}

.back-link {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    text-decoration: none;
    color: var(--text-secondary);
    display: inline-block;
    margin-bottom: 1.5rem;
    font-weight: 700;
    transition: color 0.2s ease;
}

.back-link:hover {
    color: var(--accent);
}

/* Navigation Menu */
.nav-container {
    display: flex;
    gap: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    margin-bottom: 2rem;
    position: relative;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 700;
    transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
    color: var(--accent);
}

/* Dropdown Menu styling */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-menu::before {
    content: '';
    position: absolute;
    top: -10px;
    left: 0;
    width: 100%;
    height: 10px;
    background: transparent;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--bg-card);
    min-width: 220px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.06);
    border: 1px solid var(--border);
    border-radius: 8px;
    z-index: 10;
    padding: 0.5rem 0;
    margin-top: 0.5rem;
}

.dropdown-menu a {
    color: var(--text-secondary);
    padding: 0.6rem 1.2rem;
    text-decoration: none;
    display: block;
    font-family: var(--font-main);
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.dropdown-menu a:hover {
    background-color: var(--bg-header);
    color: var(--accent);
}

.dropdown:hover .dropdown-menu {
    display: block;
}

.mobile-menu-toggle {
    display: none;
}

/* Layout Containers & Grids */
.container {
    max-width: 850px;
    margin: 2.5rem auto;
    padding: 0 1.5rem;
}

.study-cards-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-top: 1rem;
}

.study-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.75rem;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 180px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.01);
}

.study-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: 0 12px 24px rgba(142, 68, 173, 0.06);
}

.study-card h3 {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent);
    margin: 0 0 0.75rem 0;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
}

.study-card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.study-card-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 0;
}

.study-card-meta {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-top: 1.5rem;
    border-top: 1px dashed var(--border);
    padding-top: 0.75rem;
}

/* Post Lists (for list subpages) */
.section-label {
    font-family: var(--font-mono);
    color: var(--accent);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    display: block;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
    font-weight: 600;
}

.post-list {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.post-entry {
    text-decoration: none;
    display: block;
    transition: all 0.3s ease;
}

.post-entry h3 {
    font-family: var(--font-main);
    margin: 0;
    font-size: 1.25rem;
    color: var(--text-primary);
    font-weight: 600;
    letter-spacing: -0.02em;
}

.post-entry:hover h3 {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 4px;
}

.post-summary {
    margin: 0.5rem 0 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

.post-meta {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.75rem;
    display: flex;
    gap: 1rem;
    font-weight: 600;
}

.meta-tag {
    color: var(--accent);
    background: rgba(142, 68, 173, 0.08);
    padding: 1px 6px;
    border-radius: 4px;
}

/* Footer Style */
footer {
    text-align: center;
    padding: 3rem 1.5rem 2.5rem 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
    letter-spacing: 0.5px;
}

/* Typing cursor animation */
.typing-effect {
    border-right: 3px solid var(--accent);
    padding-right: 5px;
    animation: blink 0.8s infinite;
}

@keyframes blink {
    50% { border-color: transparent }
}

/* Responsive Overrides */
@media (max-width: 768px) {
    .study-cards-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    footer {
        padding: 2rem 1.5rem 1.5rem 1.5rem;
    }

    .mobile-menu-toggle {
        display: inline-block;
        font-family: var(--font-mono);
        background: none;
        border: none;
        color: var(--accent);
        cursor: pointer;
        padding: 0;
        font-size: 0.95rem;
        font-weight: 700;
        margin-bottom: 1rem;
        outline: none;
    }

    .nav-container {
        display: none;
        flex-direction: column;
        gap: 0.75rem;
        margin-bottom: 2rem;
        border-left: 2px solid var(--border);
        padding-left: 1.25rem;
    }

    .nav-container.show {
        display: flex;
    }

    .dropdown-menu {
        display: block;
        position: static;
        border: none;
        box-shadow: none;
        background: transparent;
        padding: 0 0 0 1.25rem;
        margin-top: 0.25rem;
    }

    .dropdown-menu a {
        padding: 0.25rem 0;
    }
    
    .dropdown-menu a::before {
        content: "↳ ";
        color: var(--accent);
        margin-right: 0.5rem;
    }

    .terminal-header {
        padding: 1.5rem 1.5rem 1.5rem 1.5rem;
    }

    .container {
        margin: 1.5rem auto;
    }
}