/* Variables */
:root {
    --color-primary: #1a1a1a;
    --color-secondary: #2d2d2d;
    --color-accent: #404040;
    --color-background: #fafafa;
    --color-surface: #f5f5f5;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #4a4a4a;
    --color-text-tertiary: #6e6e6e;
    --color-gray-900: #1a1a1a;
    --color-gray-800: #2d2d2d;
    --color-surface-variant: #f0f0f0;
    --transition-standard: all 0.3s ease;
}

/* Role Switcher Styles */
.role-switcher {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 2rem;
    color: var(--color-text-primary);
}

.role-prefix {
    white-space: nowrap;
}

.role-container {
    position: relative;
    display: inline-block;
    min-width: 160px;
    height: 1.5em;
}

.role {
    position: absolute;
    left: 0;
    top: 0;
    display: none;  
    align-items: center;
    gap: 8px;
    font-weight: 600;
    white-space: nowrap;
    color: var(--color-text-primary);
}

.role.active {
    display: inline-flex;  
    animation: slideIn 0.3s ease forwards;
}

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

.role i {
    font-size: 1.2rem;
    width: 20px;
    text-align: center;
}

/* Modern Button Styles */
.cta-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.cta-buttons .btn {
    padding: 14px 32px;
    font-weight: 600;
    font-size: 1.2rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 12px;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.cta-buttons .btn-dark {
    background-color: var(--color-primary);
    border: 2px solid var(--color-primary);
    color: white;
    transform: translateY(0);
}

.cta-buttons .btn-dark:hover {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.cta-buttons .btn-outline-dark {
    background-color: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    transform: translateY(0);
}

.cta-buttons .btn-outline-dark:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

/* Tech Stack Section */
.tech-stack-section {
    background: linear-gradient(135deg, var(--color-surface), var(--color-background));
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 15px;
    border: 1px solid rgba(26,26,26,0.1);
    position: relative;
    overflow: hidden;
}

.tech-stack-section h2 {
    color: var(--color-text-primary);
    margin-bottom: 1.5rem;
    text-align: center;
    font-weight: 600;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    position: relative;
    z-index: 1;
}

.tech-item {
    background: var(--color-surface);
    color: var(--color-text-primary);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    transition: var(--transition-standard);
    cursor: pointer;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.tech-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    background: var(--color-background);
}

/* Hero Left Column */
.hero-left {
    padding: 4rem;
    position: relative;
    z-index: 1;
    background: var(--color-background);
}

/* Hero Right Column */
.hero-right {
    padding: 2rem;
    background: var(--color-surface);
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-variant) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-section h1 {
    background: linear-gradient(135deg, var(--color-gray-900), var(--color-gray-800));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent; /* Fallback */
}

/* Feature Cards */
.feature-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.feature-card {
    padding: 2rem;
    background: white;
    border-radius: 12px;
    transition: var(--transition-standard);
    border: 1px solid rgba(26,26,26,0.1);
    height: 100%;
}

.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    border-color: var(--color-primary);
}

.feature-icon {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--color-text-primary);
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.feature-card p {
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

/* Responsive adjustments */
@media (max-width: 991.98px) {
    .hero-content {
        text-align: center;
        padding: 2rem 1rem;
    }

    .role-switcher {
        justify-content: center;
        font-size: 1.3rem;
    }

    .hero-section h1 {
        font-size: 2rem;
    }

    .hero-section .lead {
        font-size: 1.1rem;
        line-height: 1.6;
    }

    .cta-buttons {
        justify-content: center;
    }

    .cta-buttons .btn {
        padding: 12px 24px;
        font-size: 1rem;
    }

    .right-column {
        margin-top: 2rem;
        padding: 1.5rem;
    }

    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .github-activity img {
        max-width: 100%;
        height: auto;
    }
}

@media (max-width: 767.98px) {
    .feature-card {
        margin-bottom: 1.5rem;
    }

    .features-section .col-md-4:last-child .feature-card {
        margin-bottom: 0;
    }

    .post-card {
        height: auto;
        min-height: 120px;
        margin-bottom: 1rem;
    }

    .section-title {
        font-size: 1.3rem;
    }
}

@media (max-width: 575.98px) {
    .role-container {
        min-width: 120px;
    }

    .hero-section .lead {
        font-size: 1rem;
    }

    .cta-buttons {
        flex-direction: column;
        gap: 1rem;
    }

    .cta-buttons .btn {
        width: 100%;
        margin: 0 !important;
    }

    .right-column {
        padding: 1rem;
    }

    .feature-icon {
        font-size: 1.5rem;
    }

    .feature-card h3 {
        font-size: 1.2rem;
    }
}

/* Right Column Styles */
.right-column {
    background: var(--color-surface);
    padding: 2rem;
    border-radius: 15px;
    border: 1px solid rgba(26,26,26,0.1);
    position: relative;
}

.right-column::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 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%' height='100%' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    opacity: 0.4;
    z-index: 0;
    border-radius: 15px;
    pointer-events: none;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 1.5rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 3px;
    background-color: var(--color-primary);
}

/* Latest Posts Section */
.latest-posts {
    margin-top: 4rem;
    padding: 2rem;
    background: var(--color-surface);
    border-radius: 15px;
}

.post-card {
    padding: 1.5rem;
    border: 1px solid rgba(26,26,26,0.1);
    border-radius: 12px;
    transition: var(--transition-standard);
    background: white;
    height: 120px;  
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.post-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

.post-title {
    color: var(--color-text-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-decoration: none;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-title:hover {
    color: var(--color-secondary);
}

.post-meta {
    color: var(--color-text-tertiary);
    font-size: 0.9rem;
    margin-top: auto;
}

/* Stats Section */
.stats-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
    padding: 1rem;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

/* Animations */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fadeUp {
    animation: fadeUp 0.6s ease forwards;
}

/* Reading List Section */
.reading-list-section {
    background: var(--color-surface);
    padding: 4rem 0;
}

.reading-card {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    height: 100%;
    border: 1px solid rgba(26,26,26,0.1);
    transition: var(--transition-standard);
}

.reading-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.reading-card h4 {
    color: var(--color-text-primary);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-primary);
}

.paper-title, .book-title, .project-title {
    display: block;
    font-weight: 500;
    color: var(--color-text-primary);
}

.paper-authors, .book-author, .project-desc {
    font-size: 0.875rem;
}

/* GitHub Activity */
.github-activity {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid rgba(26,26,26,0.1);
}

.github-activity img {
    width: 100%;
    height: auto;
    border-radius: 8px;
}

/* Hero Section Improvements */
.hero-content {
    padding: 4rem 0;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 1.5rem;
}

.hero-content .lead {
    font-size: 1.3rem;
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

/* Responsive Improvements */
@media (max-width: 991px) {
    .hero-content {
        padding: 2rem 0;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .right-column {
        margin-top: 2rem;
    }
}

@media (max-width: 767px) {
    .reading-card {
        margin-bottom: 1.5rem;
    }
    
    .feature-card {
        margin-bottom: 1.5rem;
    }
}

/* Goals Section */
.section-goals {
    background-color: var(--color-surface);
    padding: 1.5rem;
    border-radius: 8px;
}

.goals-list li {
    display: flex;
    align-items: center;
    padding: 0.5rem 0;
    transition: transform 0.2s;
}

.goals-list li:hover {
    transform: translateX(5px);
}

.goals-list i {
    color: var(--color-text-tertiary);
    width: 20px;
}