/* ========================================
   Axis Sidebar Pro - Portfolio Template
   Modern Fixed Sidebar Design
   ======================================== */

/* CSS Variables */
:root {
    /* Colors */
    --bg-primary: #F7F9FC;
    --sidebar-bg: #0F172A;
    --accent-primary: #3B82F6;
    --accent-secondary: #14B8A6;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --card-bg: #FFFFFF;
    --border-color: #E2E8F0;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    --font-size-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
    --font-size-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
    --font-size-lg: clamp(1.125rem, 1rem + 0.6vw, 1.25rem);
    --font-size-xl: clamp(1.25rem, 1.1rem + 0.7vw, 1.5rem);
    --font-size-2xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
    --font-size-3xl: clamp(2rem, 1.7rem + 1.5vw, 3rem);
    --font-size-4xl: clamp(2.5rem, 2rem + 2.5vw, 4rem);
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    
    /* Sidebar */
    --sidebar-width: 280px;
    --sidebar-width-narrow: 240px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-base);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul {
    list-style: none;
}

/* ========================================
   Mobile Header
   ======================================== */
.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background-color: var(--sidebar-bg);
    z-index: 1000;
    align-items: center;
    padding: 0 var(--space-md);
    box-shadow: var(--shadow-md);
}

.menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: #fff;
    transition: all var(--transition-base);
    transform-origin: center;
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.mobile-brand {
    color: #fff;
    font-weight: 600;
    font-size: var(--font-size-lg);
    margin-left: var(--space-md);
}

/* Sidebar Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 998;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ========================================
   Sidebar
   ======================================== */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background-color: var(--sidebar-bg);
    z-index: 999;
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar-content {
    display: flex;
    flex-direction: column;
    min-height: 100%;
    padding: var(--space-xl) var(--space-lg);
}

/* Sidebar Profile */
.sidebar-profile {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.profile-avatar {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--space-md);
    border-radius: var(--radius-full);
    overflow: hidden;
    border: 4px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-lg);
}

.profile-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-name {
    color: #fff;
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.profile-title {
    color: var(--accent-primary);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Sidebar Social */
.sidebar-social {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.sidebar-social .social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
}

.sidebar-social .social-link:hover {
    background-color: var(--accent-primary);
    color: #fff;
    transform: translateY(-3px);
}

/* Sidebar Navigation */
.sidebar-nav {
    flex: 1;
}

.nav-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-base);
}

.nav-link i {
    width: 20px;
    text-align: center;
    font-size: var(--font-size-base);
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: #fff;
}

.nav-link.active {
    background-color: var(--accent-primary);
    color: #fff;
}

/* ========================================
   Main Content
   ======================================== */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

/* ========================================
   Sections
   ======================================== */
.section {
    padding: var(--space-3xl) var(--space-xl);
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    margin-bottom: var(--space-xl);
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 50px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: var(--radius-full);
}

.section-subtitle {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    margin-top: var(--space-md);
}

/* ========================================
   About Section
   ======================================== */
.section-about {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--space-3xl);
}

.about-content {
    max-width: 700px;
}

.about-name {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    line-height: 1.1;
}

.about-title {
    font-size: var(--font-size-xl);
    color: var(--accent-primary);
    font-weight: 600;
    margin-bottom: var(--space-lg);
}

.about-bio {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-xl);
}

.about-cta {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--accent-primary);
    color: #fff;
    border-color: var(--accent-primary);
}

.btn-primary:hover {
    background-color: #2563EB;
    border-color: #2563EB;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.btn-outline:hover {
    background-color: var(--accent-primary);
    color: #fff;
    transform: translateY(-2px);
}

/* ========================================
   Projects Section
   ======================================== */
.section-projects {
    background-color: var(--bg-primary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.project-card {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    opacity: 0;
    transform: translateY(20px);
}

.project-card.revealed {
    opacity: 1;
    transform: translateY(0);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.project-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-content {
    padding: var(--space-lg);
}

.project-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.project-description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--accent-primary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    transition: gap var(--transition-base);
}

.project-link:hover {
    gap: var(--space-sm);
}

/* ========================================
   Skills Section
   ======================================== */
.section-skills {
    background-color: var(--card-bg);
}

.skills-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.skill-tag {
    display: inline-flex;
    align-items: center;
    padding: var(--space-xs) var(--space-md);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #fff;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    opacity: 0;
    transform: scale(0.8);
}

.skill-tag.revealed {
    opacity: 1;
    transform: scale(1);
}

.skill-tag:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

/* ========================================
   Timeline (Experience & Education)
   ======================================== */
.section-experience,
.section-education {
    background-color: var(--bg-primary);
}

.section-education {
    background-color: var(--card-bg);
}

.timeline {
    position: relative;
    padding-left: var(--space-lg);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
    border-radius: var(--radius-full);
}

.timeline-item {
    position: relative;
    padding-bottom: var(--space-xl);
    opacity: 0;
    transform: translateX(-20px);
    transition: all var(--transition-slow);
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-item.revealed {
    opacity: 1;
    transform: translateX(0);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-1 * var(--space-lg) - 5px);
    top: 5px;
    width: 12px;
    height: 12px;
    background-color: var(--accent-primary);
    border-radius: var(--radius-full);
    border: 3px solid var(--card-bg);
    box-shadow: var(--shadow-sm);
}

.timeline-content {
    background-color: var(--card-bg);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: box-shadow var(--transition-base);
}

.timeline-content:hover {
    box-shadow: var(--shadow-lg);
}

.timeline-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.timeline-company,
.timeline-school {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: var(--space-xs);
}

.timeline-period {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.timeline-period i {
    font-size: 0.8em;
}

.timeline-description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   Contact Section
   ======================================== */
.section-contact {
    background-color: var(--bg-primary);
    text-align: center;
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.contact-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.contact-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.contact-item i {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #fff;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
}

.contact-item span {
    font-size: var(--font-size-base);
    color: var(--text-primary);
    font-weight: 500;
}

.contact-social {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
}

.contact-social .social-link {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--card-bg);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.contact-social .social-link:hover {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #fff;
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background-color: var(--sidebar-bg);
    padding: var(--space-lg) var(--space-xl);
    text-align: center;
}

.footer-text {
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--font-size-sm);
}

/* ========================================
   Responsive Design
   ======================================== */

/* Tablet */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: var(--sidebar-width-narrow);
    }
    
    .section {
        padding: var(--space-2xl) var(--space-lg);
    }
    
    .profile-avatar {
        width: 100px;
        height: 100px;
    }
    
    .sidebar-content {
        padding: var(--space-lg) var(--space-md);
    }
}

/* Mobile */
@media (max-width: 768px) {
    .mobile-header {
        display: flex;
    }
    
    .sidebar-overlay {
        display: block;
    }
    
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        width: 280px;
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
        padding-top: 60px;
    }
    
    .section {
        padding: var(--space-xl) var(--space-md);
    }
    
    .section-about {
        min-height: calc(100vh - 60px);
    }
    
    .about-name {
        font-size: var(--font-size-3xl);
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .about-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .timeline {
        padding-left: var(--space-md);
    }
    
    .timeline-item::before {
        left: calc(-1 * var(--space-md) - 5px);
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .section-title {
        font-size: var(--font-size-xl);
    }
    
    .about-name {
        font-size: var(--font-size-2xl);
    }
    
    .about-title {
        font-size: var(--font-size-lg);
    }
    
    .timeline-content {
        padding: var(--space-md);
    }
}

/* ========================================
   Animation Utilities
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.5s ease forwards;
}

.animate-fade-in {
    animation: fadeIn 0.3s ease forwards;
}