/* ====================================
   DESIGN SYSTEM: CSS VARIABLES & WEB FONTS
   ==================================== */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&family=Inter:wght@400;500;600;700&display=swap');

/* CSS Custom Properties (Design Tokens) */
:root {
    /* ===== TYPOGRAPHY ===== */
    --font-display: 'Poppins', sans-serif;      /* Headings */
    --font-body: 'Inter', sans-serif;            /* Body text */
    
    /* Font Sizes (fluid typography) */
    --fs-base: 1rem;
    --fs-sm: 0.875rem;
    --fs-lg: 1.125rem;
    --fs-xl: 1.5rem;
    --fs-2xl: 2rem;
    --fs-3xl: 2.5rem;
    --fs-4xl: 3rem;
    
    /* Line Heights */
    --lh-tight: 1.4;
    --lh-normal: 1.6;
    --lh-relaxed: 1.8;
    
    /* ===== COLOR PALETTE ===== */
    /* Primary Colors */
    --color-primary-400: #667eea;
    --color-primary-500: #5568d3;
    --color-primary-600: #4455bb;
    
    /* Secondary Colors */
    --color-secondary-400: #764ba2;
    --color-secondary-500: #6a3e94;
    
    /* Accent Colors */
    --color-accent-400: #3498db;
    --color-accent-500: #2980b9;
    
    /* Neutral Colors */
    --color-dark-bg: #2c3e50;
    --color-dark-text: #2c3e50;
    --color-light-bg: #f8f9fa;
    --color-light-text: #ffffff;
    --color-gray-100: #f8f9fa;
    --color-gray-200: #ecf0f1;
    --color-gray-300: #ddd;
    --color-gray-400: #95a5a6;
    --color-gray-500: #7f8c8d;
    --color-gray-600: #555;
    
    /* Status Colors */
    --color-success: #27ae60;
    --color-error: #e74c3c;
    --color-warning: #f39c12;
    
    /* ===== SPACING SCALE ===== */
    --space-xs: 0.5rem;    /* 8px */
    --space-sm: 1rem;      /* 16px */
    --space-md: 1.5rem;    /* 24px */
    --space-lg: 2rem;      /* 32px */
    --space-xl: 3rem;      /* 48px */
    --space-2xl: 4rem;     /* 64px */
    --space-3xl: 5rem;     /* 80px */
    
    /* ===== BORDER RADIUS ===== */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* ===== SHADOWS ===== */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 8px 20px rgba(0, 0, 0, 0.15);
    --shadow-2xl: 0 12px 30px rgba(0, 0, 0, 0.2);
    
    /* ===== TRANSITIONS ===== */
    --transition-fast: 150ms ease-out;
    --transition-base: 300ms ease-out;
    --transition-slow: 500ms ease-out;
    
    /* ===== LAYOUT ===== */
    --container-max-width: 1200px;
    --container-padding: 1.25rem;
}

/* ====================================
   RESET & BASE STYLES
   ==================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    line-height: var(--lh-normal);
    color: var(--color-dark-text);
    background-color: var(--color-light-bg);
    font-size: var(--fs-base);
}

/* ====================================
   CONTAINER & LAYOUT SYSTEM
   ==================================== */

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ====================================
   PAGE LAYOUT WITH CSS GRID
   ==================================== */

body {
    display: grid;
    grid-template-areas:
        "navbar"
        "main"
        "footer";
    grid-template-rows: auto 1fr auto;
    min-height: 100vh;
}

main {
    grid-area: main;
}

/* ====================================
   NAVIGATION
   ==================================== */

.navbar {
    grid-area: navbar;
    background-color: var(--color-dark-bg);
    color: var(--color-light-text);
    padding: var(--space-sm) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    transition: box-shadow var(--transition-base);
}

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

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-lg);
}

.navbar-brand h1 {
    font-size: var(--fs-xl);
    font-weight: 700;
    font-family: var(--font-display);
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
}

.nav-menu a {
    color: var(--color-light-text);
    text-decoration: none;
    transition: color var(--transition-base);
    font-weight: 500;
    font-size: var(--fs-sm);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent-400);
    transition: width var(--transition-base);
}

.nav-menu a:hover {
    color: var(--color-accent-400);
}

.nav-menu a:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: var(--space-xs);
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--color-light-text);
    transition: all var(--transition-base);
    border-radius: var(--radius-full);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

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

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

/* ====================================
   HERO SECTION
   ==================================== */

.hero {
    background: linear-gradient(135deg, var(--color-primary-400) 0%, var(--color-secondary-400) 100%);
    color: var(--color-light-text);
    padding: var(--space-3xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* Animated background decoration */
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 20s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -5%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 25s ease-in-out infinite reverse;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: var(--fs-4xl);
    margin-bottom: var(--space-md);
    font-weight: 700;
    font-family: var(--font-display);
    letter-spacing: -1px;
    animation: fadeInDown 0.8s ease-out;
}

.hero-content p {
    font-size: var(--fs-lg);
    margin-bottom: var(--space-lg);
    opacity: 0.95;
    animation: fadeInUp 0.8s ease-out 0.2s both;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

/* ====================================
   ANIMATIONS
   ==================================== */

@keyframes float {
    0%, 100% {
        transform: translateY(0px) translateX(0px);
    }
    50% {
        transform: translateY(-30px) translateX(20px);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ====================================
   BUTTONS
   ==================================== */

.btn {
    padding: var(--space-sm) var(--space-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--fs-base);
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-base);
    display: inline-block;
    font-family: var(--font-body);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    transition: left var(--transition-base);
    z-index: -1;
}

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

.btn-primary {
    background-color: var(--color-accent-400);
    color: var(--color-light-text);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.btn-primary:hover {
    background-color: var(--color-accent-500);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

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

.btn-secondary:hover {
    background-color: var(--color-light-text);
    color: var(--color-primary-400);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

/* ====================================
   SECTION HEADING STYLES
   ==================================== */

.about h2,
.experience h2,
.projects h2,
.skills h2,
.contact h2 {
    font-size: var(--fs-3xl);
    margin-bottom: var(--space-2xl);
    text-align: center;
    color: var(--color-dark-text);
    position: relative;
    font-family: var(--font-display);
    letter-spacing: -0.5px;
    animation: fadeInDown 0.6s ease-out;
}

.about h2::after,
.experience h2::after,
.projects h2::after,
.skills h2::after,
.contact h2::after {
    content: '';
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary-400), var(--color-accent-400));
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: var(--radius-full);
}

/* ====================================
   ABOUT SECTION
   ==================================== */

.about {
    padding: var(--space-3xl) 0;
    background-color: var(--color-light-text);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    margin-top: var(--space-lg);
    animation: slideInLeft 0.8s ease-out;
}

.about-text p {
    margin-bottom: var(--space-md);
    font-size: var(--fs-lg);
    line-height: var(--lh-relaxed);
    color: var(--color-gray-600);
}

.education h3 {
    color: var(--color-dark-text);
    margin-bottom: var(--space-lg);
    font-size: var(--fs-xl);
    font-family: var(--font-display);
}

.edu-item {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-gray-200);
    transition: transform var(--transition-base);
}

.edu-item:hover {
    transform: translateX(8px);
}

.edu-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.edu-item h4 {
    color: var(--color-primary-400);
    margin-bottom: var(--space-xs);
    font-size: var(--fs-lg);
    font-weight: 600;
}

.edu-item .institute {
    color: var(--color-gray-500);
    margin-bottom: var(--space-xs);
    font-size: var(--fs-base);
}

.edu-item .date {
    font-size: var(--fs-sm);
    color: var(--color-gray-400);
    font-weight: 500;
}

/* ====================================
   EXPERIENCE SECTION
   ==================================== */

.experience {
    padding: var(--space-3xl) 0;
    background-color: var(--color-gray-100);
}

.timeline {
    position: relative;
    padding: var(--space-lg) 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 3px;
    height: 100%;
    background: linear-gradient(180deg, var(--color-accent-400), var(--color-primary-400));
    border-radius: var(--radius-full);
}

.timeline-item {
    margin-bottom: var(--space-2xl);
    width: 45%;
    animation: slideInLeft 0.8s ease-out;
}

.timeline-item:nth-child(odd) {
    margin-left: 0;
    text-align: right;
    padding-right: var(--space-lg);
}

.timeline-item:nth-child(even) {
    margin-left: 55%;
    padding-left: var(--space-lg);
    text-align: left;
    animation: slideInRight 0.8s ease-out;
}

.timeline-date {
    font-size: var(--fs-sm);
    color: var(--color-gray-400);
    font-weight: 600;
    margin-bottom: var(--space-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.timeline-content {
    background-color: var(--color-light-text);
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border-left: 4px solid var(--color-accent-400);
    position: relative;
}

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

.timeline-content h3 {
    color: var(--color-dark-text);
    margin-bottom: var(--space-xs);
    font-size: var(--fs-lg);
    font-weight: 600;
}

.timeline-content .company {
    color: var(--color-primary-400);
    font-weight: 600;
    margin-bottom: var(--space-md);
    font-size: var(--fs-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.timeline-content ul {
    list-style: none;
    padding-left: var(--space-md);
}

.timeline-content ul li {
    margin-bottom: var(--space-sm);
    color: var(--color-gray-600);
    position: relative;
    padding-left: var(--space-md);
    line-height: var(--lh-relaxed);
    font-size: var(--fs-sm);
}

.timeline-content ul li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--color-accent-400);
    font-weight: bold;
    font-size: var(--fs-lg);
}

/* ====================================
   PROJECTS SECTION
   ==================================== */

.projects {
    padding: var(--space-3xl) 0;
    background-color: var(--color-light-text);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

.project-card {
    background-color: var(--color-light-text);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border-left: 4px solid var(--color-primary-400);
    display: flex;
    flex-direction: column;
    animation: fadeInUp 0.8s ease-out;
}

.project-card:nth-child(2) {
    animation-delay: 0.1s;
}

.project-card:nth-child(3) {
    animation-delay: 0.2s;
}

.project-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-2xl);
    border-left-color: var(--color-accent-400);
}

.project-header {
    padding: var(--space-md);
    background: linear-gradient(135deg, var(--color-gray-100), var(--color-gray-200));
    border-bottom: 1px solid var(--color-gray-200);
}

.project-header h3 {
    color: var(--color-dark-text);
    margin-bottom: var(--space-xs);
    font-size: var(--fs-lg);
    font-weight: 600;
    font-family: var(--font-display);
}

.project-role {
    font-size: var(--fs-sm);
    color: var(--color-primary-400);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.project-details {
    padding: var(--space-md);
    background-color: var(--color-gray-100);
    border-bottom: 1px solid var(--color-gray-200);
}

.project-details .date {
    font-size: var(--fs-sm);
    color: var(--color-gray-400);
    margin-bottom: var(--space-xs);
    font-weight: 500;
}

.project-details .location {
    font-size: var(--fs-sm);
    color: var(--color-gray-400);
    font-weight: 500;
}

.project-description {
    padding: var(--space-md);
    flex-grow: 1;
}

.project-description p {
    color: var(--color-gray-600);
    margin-bottom: var(--space-md);
    font-size: var(--fs-sm);
    line-height: var(--lh-relaxed);
}

.project-description p:last-child {
    margin-bottom: 0;
}

.project-tech {
    padding: 0 var(--space-md) var(--space-md);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.tag {
    display: inline-block;
    background-color: var(--color-gray-200);
    color: var(--color-primary-400);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    font-size: var(--fs-sm);
    font-weight: 600;
    transition: all var(--transition-base);
    border: 1px solid transparent;
}

.tag:hover {
    background-color: var(--color-primary-400);
    color: var(--color-light-text);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
}

/* ====================================
   SKILLS SECTION
   ==================================== */

.skills {
    padding: var(--space-3xl) 0;
    background-color: var(--color-gray-100);
}

.skills-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-2xl);
    margin-top: var(--space-lg);
}

.skills-category {
    background-color: var(--color-light-text);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    animation: fadeInUp 0.8s ease-out;
}

.skills-category:nth-child(2) {
    animation-delay: 0.1s;
}

.skills-category:nth-child(3) {
    animation-delay: 0.2s;
}

.skills-category:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.skills-category h3 {
    color: var(--color-dark-text);
    margin-bottom: var(--space-lg);
    font-size: var(--fs-xl);
    font-weight: 600;
    font-family: var(--font-display);
    padding-bottom: var(--space-md);
    border-bottom: 2px solid var(--color-primary-400);
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.skill-tag {
    display: inline-block;
    background: linear-gradient(135deg, var(--color-primary-400), var(--color-secondary-400));
    color: var(--color-light-text);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    font-size: var(--fs-sm);
    font-weight: 500;
    transition: all var(--transition-base);
    cursor: default;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.2);
}

.skill-tag:hover {
    background: linear-gradient(135deg, var(--color-secondary-400), var(--color-primary-400));
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
}

.certifications-list {
    list-style: none;
}

.certifications-list li {
    padding: var(--space-md);
    margin-bottom: var(--space-sm);
    background-color: var(--color-light-text);
    border-left: 4px solid var(--color-accent-400);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.certifications-list li:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(5px);
}

.certifications-list li strong {
    color: var(--color-dark-text);
    font-weight: 600;
    font-size: var(--fs-base);
}

/* ====================================
   CONTACT SECTION
   ==================================== */

.contact {
    padding: var(--space-3xl) 0;
    background-color: var(--color-light-text);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    margin-top: var(--space-lg);
}

.contact-info h3,
.contact-form h3 {
    color: var(--color-dark-text);
    margin-bottom: var(--space-lg);
    font-size: var(--fs-xl);
    font-weight: 600;
    font-family: var(--font-display);
}

.info-item {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-gray-200);
    transition: transform var(--transition-base);
}

.info-item:hover {
    transform: translateX(8px);
}

.info-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.info-item strong {
    color: var(--color-primary-400);
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 600;
    text-transform: uppercase;
    font-size: var(--fs-sm);
    letter-spacing: 0.5px;
}

.info-item a {
    color: var(--color-accent-400);
    text-decoration: none;
    transition: all var(--transition-base);
    font-weight: 500;
    word-break: break-all;
}

.info-item a:hover {
    color: var(--color-accent-500);
    text-decoration: underline;
}

.info-item p {
    color: var(--color-gray-600);
    font-size: var(--fs-base);
}

/* ====================================
   FORM STYLES
   ==================================== */

.contact-form {
    background: linear-gradient(135deg, var(--color-gray-100), var(--color-gray-200));
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    animation: slideInRight 0.8s ease-out;
}

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

.form-group label {
    display: block;
    margin-bottom: var(--space-sm);
    color: var(--color-dark-text);
    font-weight: 600;
    font-size: var(--fs-base);
    font-family: var(--font-display);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--space-sm);
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--fs-base);
    transition: all var(--transition-base);
    background-color: var(--color-light-text);
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group input[type="tel"]:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary-400);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
    line-height: var(--lh-relaxed);
}

.form-group input[type="range"] {
    width: calc(100% - 50px);
    margin-right: var(--space-md);
    cursor: pointer;
    accent-color: var(--color-primary-400);
    height: 6px;
    border-radius: var(--radius-full);
}

#budgetValue {
    color: var(--color-primary-400);
    font-weight: 600;
    font-family: var(--font-display);
    font-size: var(--fs-lg);
}

.form-group.checkbox-group {
    display: flex;
    align-items: center;
    margin-bottom: var(--space-md);
}

.form-group.checkbox-group label {
    display: flex;
    align-items: center;
    font-weight: normal;
    cursor: pointer;
    margin-bottom: 0;
}

.form-group.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-right: var(--space-md);
    cursor: pointer;
    width: 20px;
    height: 20px;
    accent-color: var(--color-primary-400);
}

.form-group button {
    margin-right: var(--space-md);
}

.form-message {
    margin-top: var(--space-lg);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    display: none;
    border-left: 4px solid transparent;
    animation: slideInUp 0.4s ease-out;
}

.form-message.success {
    background-color: rgba(39, 174, 96, 0.1);
    color: var(--color-success);
    display: block;
    border-left-color: var(--color-success);
}

.form-message.error {
    background-color: rgba(231, 76, 60, 0.1);
    color: var(--color-error);
    display: block;
    border-left-color: var(--color-error);
}

/* ====================================
   FOOTER
   ==================================== */

.footer {
    grid-area: footer;
    background: linear-gradient(135deg, var(--color-dark-bg) 0%, #1a252f 100%);
    color: var(--color-light-text);
    padding: var(--space-lg) 0;
    text-align: center;
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
}

.footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-lg);
}

.footer p {
    font-size: var(--fs-sm);
    font-weight: 500;
    opacity: 0.9;
}

.social-links {
    display: flex;
    gap: var(--space-lg);
}

.social-links a {
    color: var(--color-light-text);
    text-decoration: none;
    transition: all var(--transition-base);
    font-weight: 500;
    font-size: var(--fs-base);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-md);
    border: 2px solid transparent;
}

.social-links a:hover {
    color: var(--color-accent-400);
    border-color: var(--color-accent-400);
    transform: translateY(-2px);
}

/* ====================================
   RESPONSIVE DESIGN
   ==================================== */

/* Tablet (max 768px) */
@media (max-width: 768px) {
    :root {
        --fs-4xl: 2.25rem;
        --fs-3xl: 2rem;
        --fs-xl: 1.25rem;
        --container-padding: 1rem;
    }

    /* Navigation */
    .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background-color: var(--color-dark-bg);
        padding: 0;
        gap: 0;
        list-style: none;
        z-index: 999;
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-menu a {
        display: block;
        padding: var(--space-md) var(--space-lg);
    }

    .nav-menu a::after {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    /* Hero Section */
    .hero {
        padding: var(--space-2xl) 0;
    }

    .hero::before,
    .hero::after {
        display: none;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

    /* Grid Layouts */
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .skills-content {
        grid-template-columns: 1fr;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    /* Timeline */
    .timeline::before {
        left: 0;
    }

    .timeline-item {
        width: 100%;
        margin-left: 0 !important;
        padding-left: var(--space-lg) !important;
        padding-right: 0 !important;
        text-align: left !important;
    }

    .timeline-date {
        text-align: left;
    }

    /* Footer */
    .footer .container {
        flex-direction: column;
        text-align: center;
    }

    .social-links {
        justify-content: center;
    }
}

/* Mobile (max 480px) */
@media (max-width: 480px) {
    :root {
        --fs-4xl: 1.75rem;
        --fs-3xl: 1.5rem;
        --fs-2xl: 1.25rem;
        --fs-xl: 1.1rem;
        --fs-lg: 1rem;
        --space-2xl: 2rem;
        --space-xl: 1.5rem;
        --space-lg: 1rem;
        --container-padding: 0.75rem;
    }

    .navbar-brand h1 {
        font-size: var(--fs-lg);
    }

    .nav-menu {
        gap: 0;
    }

    .hero {
        padding: var(--space-xl) 0;
    }

    .about-content,
    .contact-content {
        gap: var(--space-md);
    }

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

    .projects-grid {
        gap: var(--space-md);
    }

    .form-group button {
        width: 100%;
        margin-right: 0;
        margin-bottom: var(--space-sm);
    }

    .footer .container {
        gap: var(--space-md);
    }

    .social-links {
        flex-direction: column;
        width: 100%;
    }

    .social-links a {
        width: 100%;
    }
}