/* ============================================
   PROFESSIONAL PORTFOLIO STYLESHEET
   Complete, Modern, Showcase-Ready Design
   ============================================ */

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

:root {
    --primary-color: #e74c3c;
    --secondary-color: #2c3e50;
    --accent-color: #667eea;
    --text-dark: #2c3e50;
    --text-light: #666;
    --bg-light: #fafafa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 100px 0;
}

/* ============================================
   LOADING SPINNER
   ============================================ */
.loading-spinner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-white);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s ease;
}

.loading-spinner.active {
    opacity: 1;
    pointer-events: all;
}

.loading-spinner::after {
    content: '';
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    text-decoration: none;
    transition: var(--transition);
}

.logo span {
    color: var(--primary-color);
}

.logo:hover {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    background-color: var(--primary-color);
    transition: var(--transition);
    transform: translateX(-50%);
}

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

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

/* Theme Toggle */
.theme-toggle {
    margin-left: 1rem;
}

.theme-checkbox {
    display: none;
}

.theme-label {
    position: relative;
    display: flex;
    align-items: center;
    width: 60px;
    height: 30px;
    background: var(--border-color);
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition);
    padding: 3px;
}

.theme-label i {
    position: absolute;
    font-size: 14px;
    transition: var(--transition);
}

.theme-label .fa-moon {
    left: 8px;
    color: #fff;
    opacity: 1;
}

.theme-label .fa-sun {
    right: 8px;
    color: #ffa500;
    opacity: 0;
}

.theme-ball {
    position: absolute;
    width: 24px;
    height: 24px;
    background: var(--bg-white);
    border-radius: 50%;
    transition: var(--transition);
    left: 3px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.theme-checkbox:checked + .theme-label {
    background: var(--accent-color);
}

.theme-checkbox:checked + .theme-label .theme-ball {
    transform: translateX(30px);
}

.theme-checkbox:checked + .theme-label .fa-moon {
    opacity: 0;
}

.theme-checkbox:checked + .theme-label .fa-sun {
    opacity: 1;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-dark);
    padding: 0.5rem;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: relative;
    overflow: hidden;
    padding-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><polygon fill="rgba(255,255,255,0.05)" points="0,0 1000,300 1000,1000 0,700"/></svg>');
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.hero-text {
    animation: fadeInLeft 1s ease;
}

.hero-greeting {
    font-size: 1.2rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
    opacity: 0.9;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(135deg, #fff 0%, #f0f0f0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.8rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    opacity: 0.95;
}

.hero-description {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 2.5rem;
    opacity: 0.9;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
    justify-content: center;
    align-items: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 14px 32px;
    border-radius: 30px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    font-size: 1rem;
    border: 2px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background: #c0392b;
    border-color: #c0392b;
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(231, 76, 60, 0.3);
}

.btn-secondary {
    background: transparent;
    color: white;
    border-color: white;
}

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

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

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.stat {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.stat-icon {
    font-size: 2rem;
    color: var(--primary-color);
}

.stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    opacity: 0.9;
}

.hero-image {
    position: relative;
    animation: fadeInRight 1s ease;
}

.image-wrapper {
    position: relative;
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.profile-image {
    width: 100%;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
}

.image-decoration {
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100px;
    height: 100px;
    background: var(--primary-color);
    border-radius: 50%;
    z-index: -1;
    animation: float 3s ease-in-out infinite;
}

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

/* ============================================
   SECTION HEADERS
   ============================================ */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-subtitle {
    display: inline-block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--primary-color);
}

.section-description {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 1.5rem auto 0;
}

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

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.image-container {
    position: relative;
}

.image-container img {
    width: 100%;
    max-width: 400px;
    height: 400px;
    object-fit: cover;
    border-radius: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.about-badge-left {
    position: absolute;
    top: 20px;
    left: -80px;
    width: 60px;
    height: 60px;
    background: #ff9800;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 5px 20px rgba(255, 152, 0, 0.4);
    z-index: 2;
    animation: pulse 2s ease-in-out infinite;
}

.about-badge {
    position: absolute;
    bottom: 20px;
    right: -20px;
    background: var(--primary-color);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 15px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow);
    animation: pulse 2s ease-in-out infinite;
    animation-delay: 0.5s;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.about-text h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.about-text p {
    font-size: 1.1rem;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.about-details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin: 2rem 0;
}

.detail-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.detail-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-top: 0.25rem;
}

.detail-item h4 {
    font-size: 1rem;
    color: var(--text-dark);
    margin-bottom: 0.25rem;
}

.detail-item p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin: 0;
}

.about-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 2rem;
    align-items: center;
}

/* ============================================
   SKILLS SECTION
   ============================================ */
.skills {
    background: var(--bg-light);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-top: 4px solid var(--primary-color);
}

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

.skill-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.skill-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-top: 0.5rem;
}

.skill-header h3 {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.skill-category-desc {
    font-size: 0.9rem;
    color: var(--text-light);
}

.skill-items {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.skill-item {
    padding: 1rem;
    background: var(--bg-light);
    border-radius: 10px;
    transition: var(--transition);
}

.skill-item:hover {
    background: #f0f0f0;
    transform: translateX(5px);
}

.skill-name {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.skill-name i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

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

.skill-desc {
    font-size: 0.9rem;
    color: var(--text-light);
    margin: 0;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.skill-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-light);
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-dark);
    transition: var(--transition);
}

.skill-tag:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.skill-tag i {
    color: var(--primary-color);
}

.skill-tag:hover i {
    color: white;
}

/* ============================================
   PROJECTS SECTION
   ============================================ */
.projects {
    background: var(--bg-white);
}

.project-filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 3rem;
}

.filter-btn {
    padding: 10px 24px;
    background: var(--bg-white);
    border: 2px solid var(--border-color);
    border-radius: 25px;
    color: var(--text-light);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.95rem;
}

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

.filter-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 15px rgba(231, 76, 60, 0.3);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--bg-white);
    border-radius: 15px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
    opacity: 1;
    transform: scale(1);
}

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

.project-image {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: linear-gradient(45deg, var(--accent-color), #764ba2);
}

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

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

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

.project-links-overlay {
    display: flex;
    gap: 1rem;
}

.project-link {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: var(--transition);
}

.project-link:hover {
    background: white;
    color: var(--primary-color);
    transform: scale(1.1);
}

.project-content {
    padding: 1.5rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.project-tag {
    padding: 0.25rem 0.75rem;
    background: var(--bg-light);
    border-radius: 15px;
    font-size: 0.8rem;
    color: var(--text-dark);
    font-weight: 500;
}

.project-title {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.project-description {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.project-tech span {
    padding: 0.25rem 0.75rem;
    background: var(--bg-light);
    border-radius: 15px;
    font-size: 0.8rem;
    color: var(--text-light);
}

.project-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.project-links .project-link {
    position: static;
    width: auto;
    height: auto;
    padding: 0.5rem 1rem;
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 500;
    opacity: 1;
}

.project-links .project-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* ============================================
   EDUCATION SECTION
   ============================================ */
.education {
    background: var(--bg-light);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto 4rem;
    padding-left: 2rem;
}

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

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    padding-left: 3rem;
}

.timeline-marker {
    position: absolute;
    left: -1.5rem;
    top: 0;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    box-shadow: var(--shadow);
}

.timeline-content {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-hover);
}

.timeline-date {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--bg-light);
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.timeline-title {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.timeline-subtitle {
    font-size: 1rem;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.timeline-description {
    color: var(--text-light);
    line-height: 1.6;
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.certification-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

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

.certification-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), #c0392b);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2rem;
}

.certification-card h3 {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
}

.certification-card p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.certification-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.certification-link:hover {
    gap: 1rem;
    color: #c0392b;
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #34495e 100%);
    color: white;
}

.contact .section-title,
.contact .section-subtitle,
.contact .section-description {
    color: white;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

.contact-item:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateX(10px);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.contact-details h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.contact-details a {
    color: white;
    text-decoration: none;
    transition: var(--transition);
}

.contact-details a:hover {
    color: var(--primary-color);
}

.contact-form {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.15);
}

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

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--secondary-color);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    text-align: center;
    padding: 2rem 0;
}

.footer-social {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.footer-social a {
    width: 45px;
    height: 45px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: var(--transition);
    font-size: 1.2rem;
}

.footer-social a:hover {
    background: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.3);
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.8;
}

.footer-bottom p {
    margin: 0;
    font-size: 0.9rem;
}

/* ============================================
   BACK TO TOP BUTTON
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    z-index: 1000;
}

.back-to-top.show {
    display: flex;
}

.back-to-top:hover {
    background: #c0392b;
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(231, 76, 60, 0.6);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   DARK MODE
   ============================================ */
body.dark-mode {
    background: #121212;
    color: #f5f5f5;
}

body.dark-mode .header {
    background: rgba(20, 20, 20, 0.95);
    border-bottom-color: #333;
}

body.dark-mode .logo {
    color: #f5f5f5;
}

body.dark-mode .nav-link {
    color: #ddd;
}

body.dark-mode .nav-link:hover,
body.dark-mode .nav-link.active {
    color: #ff9800;
}

body.dark-mode .section {
    background: #1e1e1e;
}

body.dark-mode .about,
body.dark-mode .projects {
    background: #1e1e1e;
}

body.dark-mode .skills,
body.dark-mode .education {
    background: #121212;
}

body.dark-mode .skill-category,
body.dark-mode .project-card,
body.dark-mode .timeline-content,
body.dark-mode .certification-card {
    background: #2a2a2a;
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.05);
}

body.dark-mode .filter-btn {
    background: #2a2a2a;
    border-color: #444;
    color: #ddd;
}

body.dark-mode .filter-btn.active {
    background: #ff9800;
    border-color: #ff9800;
    color: #121212;
}

body.dark-mode ::-webkit-scrollbar-track {
    background: #2a2a2a;
}

body.dark-mode ::-webkit-scrollbar-thumb {
    background: #ff9800;
}

body.dark-mode ::-webkit-scrollbar-thumb:hover {
    background: #e68a00;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 968px) {
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--bg-white);
        flex-direction: column;
        padding: 2rem;
        transition: var(--transition);
        box-shadow: var(--shadow);
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.4rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .skills-grid,
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .about-cta {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
}

/* ============================================
   CUSTOM SCROLLBAR
   ============================================ */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #c0392b;
}