/* ===========================
   CSS Variables & Theme Colors
   =========================== */
:root {
    /* Primary Colors */
    --primary-color: #000000;
    --primary-dark: #000000;
    --primary-light: #1a1a2e;
    --secondary-color: #0f3460;
    --accent-color: #16a085;
    
    /* Gradient Colors */
    --gradient-1: linear-gradient(135deg, #000000 0%, #0f3460 100%);
    --gradient-2: linear-gradient(135deg, #1a1a2e 0%, #16a085 100%);
    --gradient-3: linear-gradient(135deg, #000000 0%, #0f3460 100%);
    --gradient-primary: linear-gradient(135deg, #000000 0%, #0f3460 100%);
    
    /* Light Theme Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fd;
    --bg-tertiary: #e8ecf4;
    --text-primary: #000000;
    --text-secondary: #1a1a2e;
    --text-tertiary: #0f3460;
    --border-color: #d1d9e6;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Poppins', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    --text-primary: #ffffff;
    --text-secondary: #e1e8f7;
    --text-tertiary: #b8c5d6;
    --border-color: #2d3a4f;
    --shadow-sm: 0 1px 2px 0 rgba(22, 160, 133, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(22, 160, 133, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(22, 160, 133, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(22, 160, 133, 0.6);
}

/* ===========================
   Base Styles & Reset
   =========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
    background: none;
}

input, textarea, select {
    font-family: inherit;
    outline: none;
}

ul {
    list-style: none;
}

/* ===========================
   Utility Classes
   =========================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-2xl) 0;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Dark mode gradient text fix */
[data-theme="dark"] .gradient-text {
    background: linear-gradient(135deg, #ffffff 0%, #16a085 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===========================
   Navigation
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: var(--z-fixed);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.9);
}

[data-theme="dark"] .navbar.scrolled {
    background-color: rgba(26, 26, 26, 0.9);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    position: relative;
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--spacing-xs) 0;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.theme-toggle {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius-full);
    background-color: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.theme-toggle:hover {
    background-color: var(--primary-color);
    color: white;
    transform: rotate(180deg);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    width: 2rem;
    height: 2rem;
    justify-content: center;
    align-items: center;
}

.mobile-menu-toggle span {
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    transition: all var(--transition-base);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

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

/* ===========================
   Hero Section
   =========================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 80px;
}

#particles-js {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    width: 100%;
}

.hero-text {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.typing-container {
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-roles {
    font-family: var(--font-heading);
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.typing-text {
    display: inline-block;
}

.cursor {
    display: inline-block;
    animation: blink 1s infinite;
    color: var(--primary-color);
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-xl);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 2rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.2);
    transition: left var(--transition-base);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

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

.social-links a {
    width: 3rem;
    height: 3rem;
    border-radius: var(--radius-full);
    background-color: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.social-links a:hover {
    background: var(--gradient-primary);
    color: white;
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.mouse {
    width: 30px;
    height: 50px;
    border: 2px solid var(--primary-color);
    border-radius: 20px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.wheel {
    width: 4px;
    height: 10px;
    background-color: var(--primary-color);
    border-radius: 2px;
    animation: scroll 1.5s infinite;
}

@keyframes scroll {
    0% {
        opacity: 1;
        transform: translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateY(20px);
    }
}

/* ===========================
   Section Headers
   =========================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-md);
}

/* ===========================
   About Section
   =========================== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.image-wrapper {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.image-wrapper img {
    width: 100%;
    height: auto;
    transition: transform var(--transition-slow);
}

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

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0.2;
    transition: opacity var(--transition-base);
}

.image-wrapper:hover .image-overlay {
    opacity: 0;
}

.about-heading {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.about-description {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-xl) 0;
}

.highlight-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.highlight-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    background: var(--gradient-primary);
    color: white;
}

.highlight-item i {
    font-size: 2rem;
    color: var(--primary-color);
    transition: color var(--transition-base);
}

.highlight-item:hover i {
    color: white;
}

.highlight-item h4 {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.highlight-item p {
    font-size: 0.875rem;
    opacity: 0.9;
}

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

.skills-content {
    display: grid;
    gap: var(--spacing-2xl);
}

.skills-category {
    background-color: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.category-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.category-title i {
    color: var(--primary-color);
}

.skill-bar {
    margin-bottom: var(--spacing-lg);
}

.skill-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
}

.skill-name {
    font-weight: 600;
    color: var(--text-primary);
}

.skill-percentage {
    font-weight: 600;
    color: var(--primary-color);
}

.skill-progress {
    height: 10px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.skill-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    width: 0;
    transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.skill-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background-image: linear-gradient(
        -45deg,
        rgba(255, 255, 255, .2) 25%,
        transparent 25%,
        transparent 50%,
        rgba(255, 255, 255, .2) 50%,
        rgba(255, 255, 255, .2) 75%,
        transparent 75%,
        transparent
    );
    background-size: 50px 50px;
    animation: move 2s linear infinite;
}

@keyframes move {
    0% {
        background-position: 0 0;
    }
    100% {
        background-position: 50px 50px;
    }
}

.tech-stack {
    background-color: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    cursor: pointer;
}

.tech-item:hover {
    transform: translateY(-10px) scale(1.05);
    box-shadow: var(--shadow-lg);
    background: var(--gradient-primary);
    color: white;
}

.tech-item i {
    font-size: 3rem;
    transition: transform var(--transition-base);
}

.tech-item:hover i {
    transform: rotateY(360deg);
}

.tech-item span {
    font-weight: 600;
    font-size: 0.875rem;
}

/* ===========================
   Projects Section
   =========================== */
.project-filters {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.625rem 1.5rem;
    border-radius: var(--radius-full);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: 600;
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--gradient-primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.project-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.project-image {
    position: relative;
    overflow: hidden;
    height: 250px;
    background-color: var(--bg-tertiary);
}

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

.project-card:hover .project-image img {
    transform: scale(1.1);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    transition: opacity var(--transition-base);
}

.project-card:hover .project-overlay {
    opacity: 0.95;
}

.project-link {
    width: 3rem;
    height: 3rem;
    border-radius: var(--radius-full);
    background-color: white;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    transition: all var(--transition-base);
    transform: translateY(20px);
    opacity: 0;
}

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

.project-link:hover {
    transform: scale(1.2);
    box-shadow: var(--shadow-lg);
}

.project-content {
    padding: var(--spacing-lg);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.project-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    width: fit-content;
}

.project-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
    flex-grow: 1;
}

.project-tech {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.tech-tag {
    padding: 0.375rem 0.75rem;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 500;
}

/* ===========================
   Experience Section
   =========================== */
.experience {
    background-color: var(--bg-secondary);
}

.timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gradient-primary);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-2xl);
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.timeline-item:nth-child(even) .timeline-content {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
}

.timeline-item:nth-child(even) .timeline-icon {
    grid-column: 2;
    grid-row: 1;
}

.timeline-item:nth-child(odd) .timeline-content {
    grid-column: 3;
    grid-row: 1;
}

.timeline-item:nth-child(odd) .timeline-icon {
    grid-column: 2;
    grid-row: 1;
}

.timeline-icon {
    width: 4rem;
    height: 4rem;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    box-shadow: 0 0 0 4px var(--bg-secondary), 0 0 0 8px var(--primary-color);
    z-index: 2;
}

.timeline-content {
    background-color: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
}

.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.timeline-date {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.timeline-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.timeline-company {
    color: var(--primary-color);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.timeline-description {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.timeline-achievements {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.timeline-achievements li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
}

.timeline-achievements li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
}

.timeline-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.timeline-item:nth-child(even) .timeline-tags {
    justify-content: flex-end;
}

.tag {
    padding: 0.375rem 0.75rem;
    background-color: var(--bg-secondary);
    color: var(--primary-color);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid var(--primary-light);
}

/* ===========================
   Contact Section
   =========================== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

.contact-heading {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.contact-description {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

.contact-details {
    margin-bottom: var(--spacing-xl);
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    align-items: start;
}

.contact-icon {
    width: 3.5rem;
    height: 3.5rem;
    border-radius: var(--radius-lg);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.contact-text h4 {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.contact-text a {
    color: var(--primary-color);
    font-weight: 500;
}

.contact-text a:hover {
    text-decoration: underline;
}

.contact-social h4 {
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.contact-form {
    background-color: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.error-message {
    display: block;
    color: #ef4444;
    font-size: 0.875rem;
    margin-top: 0.25rem;
    min-height: 1.25rem;
}

.form-group.error input,
.form-group.error textarea {
    border-color: #ef4444;
}

.btn-submit {
    width: 100%;
    justify-content: center;
    font-size: 1.125rem;
    padding: 1rem 2rem;
}

.form-status {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: 600;
    display: none;
}

.form-status.success {
    background-color: #d1fae5;
    color: #065f46;
    display: block;
}

.form-status.error {
    background-color: #fee2e2;
    color: #991b1b;
    display: block;
}

/* ===========================
   Footer
   =========================== */
.footer {
    background-color: var(--bg-secondary);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo p {
    color: var(--text-secondary);
    margin-top: var(--spacing-sm);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.footer-column h4 {
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-column ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-column ul li a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.footer-column ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.footer-bottom p {
    margin-bottom: 0.5rem;
}

.footer-bottom i {
    color: #ef4444;
}

/* ===========================
   Scroll to Top Button
   =========================== */
.scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: var(--z-fixed);
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 968px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        flex-direction: column;
        background-color: var(--bg-primary);
        padding: var(--spacing-xl) 0;
        box-shadow: var(--shadow-lg);
        transition: left var(--transition-base);
        border-top: 1px solid var(--border-color);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 30px;
    }
    
    .timeline-item {
        grid-template-columns: auto 1fr;
        gap: var(--spacing-md);
    }
    
    .timeline-item:nth-child(even) .timeline-content,
    .timeline-item:nth-child(odd) .timeline-content {
        grid-column: 2;
        text-align: left;
    }
    
    .timeline-item:nth-child(even) .timeline-icon,
    .timeline-item:nth-child(odd) .timeline-icon {
        grid-column: 1;
    }
    
    .timeline-item:nth-child(even) .timeline-tags {
        justify-content: flex-start;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .about-highlights {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }
    
    .scroll-top {
        bottom: 1rem;
        right: 1rem;
        width: 3rem;
        height: 3rem;
    }
}

/* ===========================
   Loading Animations
   =========================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* ===========================
   Accessibility
   =========================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}