:root {
    /* Clean blue/grey/orange palette */
    --primary-bg: #0f0f0f;
    --secondary-bg: #1a1a1a;
    --accent-bg: #262626;
    --card-bg: #1f1f1f;
    --border: #404040;
    /* Text colors */
    --primary-text: #ffffff;
    --secondary-text: #b3b3b3;
    --accent-text: #737373;
    /* Accent colors */
    --blue: #3b82f6;
    --blue-dark: #2563eb;
    --blue-light: #60a5fa;
    --blue-muted: rgba(59, 130, 246, 0.1);
    --orange: #f97316;
    --orange-dark: #ea580c;
    --orange-muted: rgba(249, 115, 22, 0.1);
    /* Layout variables */
    --max-width: 1200px;
    --subtle-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --sidebar-width: 320px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--primary-bg);
    color: var(--primary-text);
    overflow-x: hidden;
    line-height: 1.6;
    display: flex;
}

    /* Subtle background texture */
    body::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-image: radial-gradient(circle at 25% 25%, var(--blue-muted) 0%, transparent 50%), radial-gradient(circle at 75% 75%, var(--orange-muted) 0%, transparent 50%);
        pointer-events: none;
        z-index: -1;
        transition: all 0.4s ease;
    }

/* New Sidebar Layout */
.sidebar {
    width: var(--sidebar-width);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    background: var(--secondary-bg);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    padding: 3rem;
    text-align: center;
    z-index: 100;
}

.sidebar-top {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.1rem;
}

.sidebar .profile-image {
    width: 150px;
    height: 150px;
    object-fit: cover;
    border-radius: 50%;
    border: 4px solid var(--border);
    box-shadow: var(--subtle-shadow);
    margin-bottom: 0.5rem;
}

.sidebar h1 {
    font-family: 'Playfair Display', serif;
    font-size: clamp(1.8rem, 5vw, 2.2rem);
    font-weight: 700;
    background: linear-gradient(135deg, var(--blue-light), var(--blue));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin: 0;
}

.sidebar-top h2 {
    font-size: 1rem;
    font-weight: 400;
    color: var(--secondary-text);
}

/* Remove underline from sidebar profile link */
.sidebar-top-link {
    text-decoration: none;
}

.sidebar nav {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
}

    .sidebar nav a {
        color: var(--secondary-text);
        text-decoration: none;
        font-weight: 500;
        font-size: 1.4rem;
        text-transform: uppercase;
        letter-spacing: 0.5px;
        position: relative;
        transition: all 0.3s ease;
        line-height: 1;
        display: inline-block;
    }

        .sidebar nav a:hover {
            color: var(--primary-text);
            transform: translateX(5px);
        }

.sidebar-bottom a {
    color: var(--secondary-text);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

    .sidebar-bottom a:hover {
        color: var(--blue-light);
    }

.main-content {
    margin-left: var(--sidebar-width);
    width: calc(100% - var(--sidebar-width));
    padding: 0;
    overflow-y: auto;
    animation: fadeIn 0.5s ease-in-out;
}

/* Section dividers */
.section-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--blue) 50%, transparent 100%);
    margin: 0;
    border: none;
}

/* Style override for project pages */
.project-page-body::before {
    background-image: radial-gradient(circle at 25% 25%, var(--blue-muted) 0%, transparent 60%), radial-gradient(circle at 80% 20%, var(--blue-muted) 0%, transparent 40%);
    opacity: 0.7;
}

/* Page load animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .sidebar {
        position: relative;
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border);
        justify-content: center;
        gap: 2rem;
    }

    .main-content {
        margin-left: 0;
        width: 100%;
    }

    body {
        flex-direction: column;
    }
}

@media (max-width: 768px) {
    .sidebar nav {
        flex-direction: row;
        justify-content: center;
        gap: 1.5rem;
    }

        .sidebar nav a {
            font-size: 0.85rem;
        }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--primary-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--blue);
    border-radius: 4px;
}

    ::-webkit-scrollbar-thumb:hover {
        background: var(--blue-dark);
    }

/* --- Back to Top Button --- */
.back-to-top {
    position: fixed;
    top: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(31, 31, 31, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--primary-text);
    border: 1px solid var(--border);
    border-radius: 2rem;
    padding: 0.5rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    opacity: 0;
    visibility: hidden;
    transform: translate(-50%, -20px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
}

    .back-to-top.visible {
        opacity: 1;
        visibility: visible;
        transform: translateX(-50%);
    }

    .back-to-top:hover {
        background: var(--blue);
        color: var(--primary-text);
        border-color: var(--blue);
    }

    .back-to-top svg {
        width: 16px;
        height: 16px;
    }