/* ========================================
   Modern Portfolio CSS
   ======================================== */

/* ========== CSS VARIABLES ========== */
:root {
    /* Colors */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #f5576c;
    
    --text-primary: #1a1a2e;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    
    --card-bg: #ffffff;
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --card-shadow-hover: 0 20px 50px rgba(0, 0, 0, 0.15);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Poppins', sans-serif;
    
    /* Spacing */
    --section-padding: 100px 0;
    --container-padding: 0 20px;
    --max-width: 1200px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-light: #9ca3af;
    
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    
    --card-bg: #1e293b;
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    --card-shadow-hover: 0 20px 50px rgba(0, 0, 0, 0.4);
}

/* ========== RESET & BASE STYLES ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

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-medium),
                color var(--transition-medium);
}

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

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

ul {
    list-style: none;
}

button {
    font-family: inherit;
    border: none;
    cursor: pointer;
    transition: all var(--transition-medium);
}

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

.section {
    padding: var(--section-padding);
    position: relative;
}

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

/* ========== LOADING SCREEN ========== */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
}

.loader-circle {
    width: 60px;
    height: 60px;
    border: 4px solid var(--bg-tertiary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

.loader-content p {
    color: var(--text-secondary);
    font-weight: 500;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ========== THEME TOGGLE ========== */
.theme-toggle {
    position: fixed;
    top: 100px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--card-bg);
    border-radius: 50%;
    box-shadow: var(--card-shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: all var(--transition-medium);
}

.theme-toggle:hover {
    transform: translateY(-3px);
    box-shadow: var(--card-shadow-hover);
}

.theme-toggle i {
    font-size: 20px;
    transition: all var(--transition-medium);
}

.theme-toggle .fa-sun {
    display: none;
    color: #f59e0b;
}

.theme-toggle .fa-moon {
    color: var(--primary-color);
}

[data-theme="dark"] .theme-toggle .fa-sun {
    display: block;
}

[data-theme="dark"] .theme-toggle .fa-moon {
    display: none;
}

/* ========== NAVIGATION ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: transparent;
    padding: 20px 0;
    z-index: 999;
    transition: all var(--transition-medium);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    padding: 15px 0;
}

[data-theme="dark"] .navbar.scrolled {
    background: rgba(15, 23, 42, 0.95);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-family: var(--font-heading);
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 2px;
}

.logo-dot {
    color: var(--primary-color);
    font-size: 40px;
    line-height: 0;
}

.nav-menu {
    display: flex;
    gap: 40px;
    align-items: center;
}

.nav-link {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    position: relative;
    padding: 5px 0;
}

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

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 3px;
    transition: all var(--transition-medium);
}

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

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.gradient-sphere {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: float 20s infinite;
}

.sphere-1 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.sphere-2 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, #f093fb, #f5576c);
    bottom: -150px;
    left: -150px;
    animation-delay: 5s;
}

.sphere-3 {
    width: 350px;
    height: 350px;
    background: linear-gradient(135deg, #4facfe, #00f2fe);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.1); }
    66% { transform: translate(-20px, 20px) scale(0.9); }
}

.hero-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--container-padding);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--card-bg);
    padding: 10px 20px;
    border-radius: 50px;
    box-shadow: var(--card-shadow);
    margin-bottom: 30px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.badge-emoji {
    font-size: 20px;
    animation: wave 2s infinite;
}

@keyframes wave {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(20deg); }
    75% { transform: rotate(-20deg); }
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 64px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.hero-subtitle {
    font-family: var(--font-heading);
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-secondary);
}

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

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

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

.hero-description {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 500px;
}

.hero-cta {
    display: flex;
    gap: 20px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    transition: all var(--transition-medium);
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.5);
}

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

.btn-secondary:hover {
    border-color: var(--primary-color);
    transform: translateY(-3px);
}

.hero-social {
    display: flex;
    gap: 15px;
}

.social-link {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 20px;
    transition: all var(--transition-medium);
}

.social-link:hover {
    background: var(--primary-gradient);
    color: white;
    transform: translateY(-5px);
}

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

.image-wrapper {
    position: relative;
    width: 100%;
    max-width: 450px;
    margin: 0 auto;
}

.image-wrapper img {
    width: 100%;
    border-radius: var(--radius-xl);
    box-shadow: var(--card-shadow-hover);
    position: relative;
    z-index: 2;
}

.image-border {
    position: absolute;
    top: 20px;
    left: 20px;
    right: -20px;
    bottom: -20px;
    background: var(--primary-gradient);
    border-radius: var(--radius-xl);
    z-index: 1;
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.mouse {
    width: 25px;
    height: 40px;
    border: 2px solid var(--text-light);
    border-radius: 15px;
    position: relative;
}

.wheel {
    width: 3px;
    height: 8px;
    background: var(--text-light);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% { opacity: 1; top: 8px; }
    100% { opacity: 0; top: 20px; }
}

/* ========== SECTION HEADER ========== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.section-description {
    font-size: 18px;
    color: var(--text-secondary);
}

/* ========== ABOUT SECTION ========== */
.about {
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-top: 40px;
}

.about-card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow);
}

.about-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.about-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 15px;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
    padding: 30px 20px;
    background: var(--card-bg);
    border-radius: var(--radius-md);
    box-shadow: var(--card-shadow);
    transition: all var(--transition-medium);
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
}

.stat-number {
    font-family: var(--font-heading);
    font-size: 48px;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.experience-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--bg-tertiary);
}

.timeline-item {
    position: relative;
    padding-bottom: 40px;
}

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

.timeline-dot {
    position: absolute;
    left: -36px;
    top: 5px;
    width: 14px;
    height: 14px;
    background: var(--primary-gradient);
    border-radius: 50%;
    box-shadow: 0 0 0 4px var(--card-bg);
}

.timeline-date {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-color);
    background: var(--bg-tertiary);
    padding: 5px 15px;
    border-radius: 20px;
    margin-bottom: 10px;
}

.timeline-content h4 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.timeline-company {
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

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

/* ========== SKILLS SECTION ========== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 40px;
}

.skill-category {
    background: var(--card-bg);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow);
    transition: all var(--transition-medium);
}

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

.category-icon {
    width: 70px;
    height: 70px;
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: white;
    margin-bottom: 25px;
}

.skill-category h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.skill-list {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.skill-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.skill-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 10px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: 10px;
    width: 0;
    transition: width 1.5s ease;
}

/* ========== SERVICES SECTION ========== */
.services {
    background: var(--bg-secondary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 40px;
}

.service-card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow);
    transition: all var(--transition-medium);
    border: 2px solid transparent;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--card-shadow-hover);
    border-color: var(--primary-color);
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: var(--primary-color);
    margin-bottom: 25px;
}

.service-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.service-card > p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 25px;
}

.service-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
}

.service-features i {
    color: var(--primary-color);
    font-size: 12px;
}

/* ========== PROJECTS SECTION ========== */
.projects-filter {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 12px 25px;
    background: var(--card-bg);
    color: var(--text-secondary);
    border: 2px solid var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    transition: all var(--transition-medium);
}

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

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 50px;
}

.project-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: all var(--transition-medium);
}

.project-card.hidden {
    display: none;
}

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

.project-image {
    position: relative;
    overflow: hidden;
    height: 250px;
}

.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: rgba(102, 126, 234, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    opacity: 0;
    transition: opacity var(--transition-medium);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-link {
    width: 50px;
    height: 50px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 18px;
    transition: all var(--transition-medium);
}

.project-link:hover {
    transform: scale(1.1);
}

.project-content {
    padding: 30px;
}

.project-tags {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.tag {
    font-size: 12px;
    font-weight: 600;
    padding: 5px 12px;
    background: var(--bg-tertiary);
    color: var(--primary-color);
    border-radius: 20px;
}

.project-content h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.project-content p {
    color: var(--text-secondary);
    line-height: 1.7;
}

.projects-cta {
    text-align: center;
}

/* ========== CONTACT SECTION ========== */
.contact {
    background: var(--bg-secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
    margin-top: 40px;
}

.contact-card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow);
    margin-bottom: 30px;
}

.contact-card h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.contact-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 25px;
    margin-bottom: 30px;
}

.contact-detail {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.detail-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--primary-color);
    flex-shrink: 0;
}

.detail-text h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 5px;
    color: var(--text-primary);
}

.detail-text a,
.detail-text p {
    color: var(--text-secondary);
    font-size: 15px;
}

.detail-text a:hover {
    color: var(--primary-color);
}

.contact-social h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.social-links {
    display: flex;
    gap: 12px;
}

.contact-form {
    background: var(--card-bg);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow);
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    background: var(--bg-secondary);
    border: 2px solid var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 15px;
    color: var(--text-primary);
    transition: all var(--transition-medium);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--card-bg);
}

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

.error-message {
    display: block;
    color: var(--accent-color);
    font-size: 13px;
    margin-top: 5px;
    display: none;
}

.form-group.error input,
.form-group.error textarea {
    border-color: var(--accent-color);
}

.form-group.error .error-message {
    display: block;
}

.form-message {
    margin-top: 20px;
    padding: 15px 20px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 500;
    display: none;
}

.form-message.success {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
    border: 1px solid #22c55e;
    display: block;
}

.form-message.error {
    background: rgba(245, 87, 108, 0.1);
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
    display: block;
}

/* ========== FOOTER ========== */
.footer {
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 50px;
}

.footer-about {
    max-width: 350px;
}

.footer-about .logo-text {
    font-family: var(--font-heading);
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 20px;
    display: block;
}

.footer-about p {
    line-height: 1.8;
    opacity: 0.8;
}

.footer-links h4,
.footer-resources h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 20px;
}

.footer-links ul,
.footer-resources ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a,
.footer-resources a {
    opacity: 0.8;
    transition: all var(--transition-medium);
}

.footer-links a:hover,
.footer-resources a:hover {
    opacity: 1;
    color: var(--primary-color);
    padding-left: 5px;
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom p {
    opacity: 0.7;
    font-size: 14px;
}

.footer-credits i {
    color: var(--accent-color);
    animation: heartbeat 1.5s infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

/* ========== BACK TO TOP BUTTON ========== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-gradient);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: var(--card-shadow);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-medium);
    z-index: 998;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
}

/* ========== RESPONSIVE DESIGN ========== */
@media (max-width: 1024px) {
    :root {
        --section-padding: 80px 0;
    }
    
    .hero-title {
        font-size: 52px;
    }
    
    .hero-subtitle {
        font-size: 28px;
    }
    
    .section-title {
        font-size: 40px;
    }
    
    .skills-grid,
    .services-grid,
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content,
    .contact-content {
        gap: 40px;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px 0;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 350px;
        height: 100vh;
        background: var(--card-bg);
        flex-direction: column;
        padding: 80px 40px;
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.1);
        transition: right var(--transition-medium);
        z-index: 999;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .hamburger {
        display: flex;
        z-index: 1000;
    }
    
    .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(8px, -8px);
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .hero-image {
        order: -1;
    }
    
    .hero-title {
        font-size: 40px;
    }
    
    .hero-subtitle {
        font-size: 24px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .skills-grid,
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .theme-toggle {
        top: 80px;
        right: 20px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 20px;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .projects-filter {
        gap: 10px;
    }
    
    .filter-btn {
        padding: 10px 20px;
        font-size: 14px;
    }
}

/* ========== ANIMATIONS (AOS Alternative) ========== */
[data-aos] {
    opacity: 0;
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].aos-animate {
    opacity: 1;
}

[data-aos="fade-up"] {
    transform: translateY(30px);
}

[data-aos="fade-up"].aos-animate {
    transform: translateY(0);
}

[data-aos="fade-down"] {
    transform: translateY(-30px);
}

[data-aos="fade-down"].aos-animate {
    transform: translateY(0);
}

[data-aos="fade-left"] {
    transform: translateX(30px);
}

[data-aos="fade-left"].aos-animate {
    transform: translateX(0);
}

[data-aos="fade-right"] {
    transform: translateX(-30px);
}

[data-aos="fade-right"].aos-animate {
    transform: translateX(0);
}

[data-aos="zoom-in"] {
    transform: scale(0.9);
}

[data-aos="zoom-in"].aos-animate {
    transform: scale(1);
}