/* ==========================================
   Global Variables & Reset
   ========================================== */
:root {
    /* Light Theme Colors */
    --primary-color: #2563eb;
    --secondary-color: #3b82f6;
    --accent-color: #8b5cf6;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 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: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-secondary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --section-padding: 100px 0;
    --container-padding: 0 20px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* Dark Theme Colors */
[data-theme="dark"] {
    --primary-color: #3b82f6;
    --secondary-color: #60a5fa;
    --accent-color: #a78bfa;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --border-color: #374151;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

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

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

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

/* ==========================================
   Loading Screen
   ========================================== */
#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

#loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader {
    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); }
}

/* ==========================================
   Utility Components
   ========================================== */
.theme-toggle,
.lang-toggle,
.back-to-top {
    position: fixed;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    z-index: 1000;
}

.theme-toggle:hover,
.lang-toggle:hover,
.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.theme-toggle {
    bottom: 30px;
    right: 30px;
}

.lang-toggle {
    bottom: 90px;
    right: 30px;
    font-weight: 600;
    font-size: 14px;
}

.back-to-top {
    bottom: 150px;
    right: 30px;
    opacity: 0;
    visibility: hidden;
}

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

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

.narrow-container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--container-padding);
}

/* ==========================================
   Buttons
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    cursor: pointer;
    font-family: var(--font-primary);
}

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

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

/* ==========================================
   Navigation
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--bg-primary);
    box-shadow: var(--shadow);
    z-index: 999;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    padding: 10px 0;
    box-shadow: var(--shadow-lg);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-primary);
}

.nav-logo {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.nav-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    position: relative;
    transition: color var(--transition-fast);
    padding: 8px 0;
}

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

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

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

/* ==========================================
   Hero Section
   ========================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 20px 60px;
    position: relative;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero-content {
    max-width: 1200px;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text {
    z-index: 2;
}

.hero-greeting {
    font-size: 18px;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 10px;
}

.hero-name {
    font-family: var(--font-primary);
    font-size: 64px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 10px;
    line-height: 1.2;
}

.hero-title {
    font-size: 32px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    min-height: 50px;
    font-weight: 600;
}

.typing-text {
    color: var(--primary-color);
}

.cursor {
    animation: blink 0.7s infinite;
}

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

.hero-description {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 30px;
    line-height: 1.8;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.hero-social {
    display: flex;
    gap: 20px;
}

.hero-social a {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-size: 20px;
    transition: all var(--transition-normal);
}

.hero-social a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-3px);
}

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
}

.image-container {
    position: relative;
    width: 400px;
    height: 400px;
}

.image-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.image-border {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 100%;
    height: 100%;
    border: 3px solid var(--primary-color);
    border-radius: var(--radius-xl);
    z-index: -1;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
}

.hero-scroll a {
    color: var(--text-secondary);
    font-size: 24px;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* ==========================================
   Section Styling
   ========================================== */
.section {
    padding: var(--section-padding);
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-label {
    display: inline-block;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 10px;
}

.section-title {
    font-family: var(--font-primary);
    font-size: 48px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 20px;
}

/* ==========================================
   About Section
   ========================================== */
.about-section {
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
}

.about-text h3 {
    font-size: 28px;
    color: var(--text-primary);
    margin-bottom: 20px;
    font-weight: 700;
}

.about-text p {
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-info {
    margin-top: 30px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
    font-size: 16px;
    color: var(--text-secondary);
}

.info-item i {
    color: var(--primary-color);
    font-size: 20px;
    width: 30px;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.stat-card {
    background: var(--bg-primary);
    padding: 30px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow);
    transition: all var(--transition-normal);
}

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

.stat-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 15px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon i {
    font-size: 28px;
    color: white;
}

.stat-card h4 {
    font-size: 36px;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-card p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ==========================================
   Experience Section (Timeline)
   ========================================== */
.experience-section {
    background: var(--bg-primary);
}

/* Experience/Education Tabs */
.experience-tabs {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 40px 0;
}

.experience-tab-btn {
    padding: 15px 40px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 10px;
}

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

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

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: tabFadeIn 0.5s ease-in;
}

@keyframes tabFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 50px;
}

.timeline-dot {
    position: absolute;
    left: -46px;
    top: 0;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--primary-color);
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 0 4px var(--bg-secondary);
}

.timeline-content {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: all var(--transition-normal);
}

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

.timeline-date {
    display: inline-block;
    font-size: 14px;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 10px;
}

.timeline-content h3 {
    font-size: 22px;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-weight: 700;
}

.timeline-content h4 {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-weight: 500;
}

.timeline-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 10px;
}

.timeline-content ul {
    list-style: none;
    padding: 0;
}

.timeline-content ul li {
    color: var(--text-secondary);
    padding-left: 25px;
    position: relative;
    margin-bottom: 12px;
    line-height: 1.6;
}

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

/* ==========================================
   Education Section
   ========================================== */
.education-section {
    background: var(--bg-secondary);
}

/* Education Cards */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.education-card {
    background: var(--bg-secondary);
    padding: 35px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: all var(--transition-normal);
    border-top: 4px solid var(--primary-color);
}

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

.education-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.education-icon i {
    font-size: 28px;
    color: white;
}

.education-logo {
    width: 120px;
    height: 100px;
    margin: 0 auto 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 15px;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
    transition: all var(--transition-normal);
}

.education-logo:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px) scale(1.05);
    box-shadow: var(--shadow-lg);
}

.education-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

[data-theme="dark"] .education-logo {
    background: var(--bg-tertiary);
}

[data-theme="dark"] .education-logo img {
    filter: brightness(0.9);
}

.education-card h3 {
    font-size: 20px;
    color: var(--text-primary);
    margin-bottom: 10px;
    font-weight: 700;
}

.education-card h4 {
    font-size: 16px;
    color: var(--primary-color);
    margin-bottom: 10px;
    font-weight: 600;
}

.education-date {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 15px;
}

.education-card ul {
    list-style: none;
    padding: 0;
    margin-top: 15px;
}

.education-card ul li {
    color: var(--text-secondary);
    padding-left: 20px;
    position: relative;
    margin-bottom: 8px;
    font-size: 14px;
}

.education-card ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

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

.skills-filter {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.skill-filter-btn {
    padding: 10px 24px;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 14px;
}

.skill-filter-btn:hover,
.skill-filter-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 25px;
}

.skill-card {
    background: var(--bg-primary);
    padding: 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    text-align: center;
    transition: all var(--transition-normal);
}

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

.skill-icon {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.skill-card h3 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 15px;
    font-weight: 600;
}

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

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 10px;
    width: 0;
    transition: width 1s ease;
}

.skill-percentage {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 600;
}

/* Languages */
.languages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.language-card {
    background: var(--bg-primary);
    padding: 25px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: all var(--transition-normal);
}

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

.language-card h3 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 15px;
    font-weight: 600;
}

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

.language-level {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 10px;
}

.language-card span {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 600;
}

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

.project-filters {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.project-filter-btn {
    padding: 10px 24px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 14px;
}

.project-filter-btn:hover,
.project-filter-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

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

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

.project-image {
    position: relative;
    width: 100%;
    height: 250px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(37, 99, 235, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

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

.project-link {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 20px;
    transition: transform var(--transition-normal);
}

.project-link:hover {
    transform: scale(1.2);
}

.project-content {
    padding: 25px;
}

.project-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

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

.project-content h3 {
    font-size: 20px;
    color: var(--text-primary);
    margin-bottom: 12px;
    font-weight: 700;
    line-height: 1.4;
}

.project-content p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

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

/* ==========================================
   Certificates Section
   ========================================== */
.certificates-section {
    background: var(--bg-secondary);
}

.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.certificate-card {
    background: var(--bg-primary);
    padding: 35px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    text-align: center;
    transition: all var(--transition-normal);
    border-top: 4px solid var(--primary-color);
}

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

.certificate-badge {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.certificate-badge i {
    font-size: 32px;
    color: white;
}

.certificate-logo {
    width: 100px;
    height: 80px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 15px;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
    transition: all var(--transition-normal);
}

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

.certificate-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    filter: var(--logo-filter);
}

.certificate-logo.award-logo {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border: none;
}

.certificate-logo.award-logo i {
    font-size: 40px;
    color: white;
}

[data-theme="dark"] .certificate-logo img {
    filter: brightness(0) invert(1);
}

[data-theme="dark"] .certificate-logo.award-logo img {
    filter: none;
}

.certificate-card h3 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 10px;
    font-weight: 700;
    line-height: 1.4;
}

.certificate-issuer {
    font-size: 15px;
    color: var(--primary-color);
    margin-bottom: 5px;
    font-weight: 600;
}

.certificate-date {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 15px;
}

.certificate-verify {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.certificate-verify:hover {
    color: var(--secondary-color);
}

/* ==========================================
   Professional Development Section
   ========================================== */
.professional-dev-section {
    background: var(--bg-secondary);
}

.dev-category {
    margin-bottom: 60px;
}

.dev-category:last-child {
    margin-bottom: 0;
}

.dev-category-title {
    font-size: 28px;
    color: var(--text-primary);
    margin-bottom: 30px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 15px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--primary-color);
}

.dev-category-title i {
    color: var(--primary-color);
    font-size: 32px;
}

.dev-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.dev-card {
    background: var(--bg-primary);
    padding: 30px;
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-color);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.dev-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
}

.dev-card:hover::before {
    transform: scaleX(1);
}

.dev-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.dev-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: white;
    font-size: 28px;
}

.dev-card h4 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 15px;
    font-weight: 600;
    line-height: 1.4;
    min-height: 50px;
}

.dev-issuer {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 10px;
    font-weight: 500;
}

.dev-date {
    color: var(--text-tertiary);
    font-size: 13px;
    margin-bottom: 10px;
}

.dev-verify {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    margin-top: 10px;
    transition: all var(--transition-fast);
}

.dev-verify:hover {
    color: var(--accent-color);
    transform: translateX(5px);
}

.dev-verify i {
    font-size: 12px;
    margin-left: 5px;
}

/* Dark Theme Adjustments */
[data-theme="dark"] .professional-dev-section {
    background: var(--bg-primary);
}

[data-theme="dark"] .dev-card {
    background: var(--bg-tertiary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .dev-grid {
        grid-template-columns: 1fr;
    }

    .dev-category-title {
        font-size: 24px;
    }

    .dev-card h4 {
        font-size: 16px;
        min-height: auto;
    }
}

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

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

.contact-info h3 {
    font-size: 32px;
    color: var(--text-primary);
    margin-bottom: 20px;
    font-weight: 700;
}

.contact-info > p {
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.contact-details {
    margin-bottom: 40px;
}

.contact-item {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
}

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

.contact-icon i {
    font-size: 20px;
    color: white;
}

.contact-item h4 {
    font-size: 16px;
    color: var(--text-primary);
    margin-bottom: 5px;
    font-weight: 600;
}

.contact-item p,
.contact-item a {
    font-size: 15px;
    color: var(--text-secondary);
    text-decoration: none;
}

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

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

.contact-social a {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-size: 20px;
    transition: all var(--transition-normal);
}

.contact-social a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-3px);
}

/* Contact Form */
.contact-form {
    background: var(--bg-secondary);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

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

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 15px;
    font-family: var(--font-secondary);
    transition: all var(--transition-normal);
}

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

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

.contact-form .btn {
    width: 100%;
    justify-content: center;
    margin-top: 10px;
}

/* ==========================================
   Footer
   ========================================== */
.footer {
    background: var(--bg-secondary);
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 30px;
}

.footer-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.footer-logo {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.footer-info p {
    font-size: 14px;
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: 30px;
}

.footer-links a {
    font-size: 14px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-counter p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 1024px) {
    .hero-name {
        font-size: 52px;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .image-container {
        width: 350px;
        height: 350px;
    }
    
    .about-content {
        grid-template-columns: 1.5fr 1fr;
    }
    
    .contact-content {
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--bg-primary);
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
        gap: 0;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        padding: 15px 0;
        width: 100%;
        border-bottom: 1px solid var(--border-color);
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-text {
        order: 2;
    }
    
    .hero-image {
        order: 1;
    }
    
    .hero-name {
        font-size: 42px;
    }
    
    .hero-title {
        font-size: 24px;
    }
    
    .hero-description {
        max-width: 100%;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-social {
        justify-content: center;
    }
    
    .image-container {
        width: 300px;
        height: 300px;
    }
    
    .section-title {
        font-size: 36px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .timeline {
        padding-left: 30px;
    }
    
    .timeline-dot {
        left: -36px;
    }
    
    .experience-tabs {
        flex-direction: column;
        gap: 10px;
    }
    
    .experience-tab-btn {
        width: 100%;
        justify-content: center;
    }
    
    .skills-grid,
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-name {
        font-size: 36px;
    }
    
    .hero-title {
        font-size: 20px;
    }
    
    .image-container {
        width: 250px;
        height: 250px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 14px;
    }
    
    .theme-toggle,
    .lang-toggle,
    .back-to-top {
        width: 45px;
        height: 45px;
        font-size: 16px;
    }
    
    .theme-toggle {
        bottom: 20px;
        right: 20px;
    }
    
    .lang-toggle {
        bottom: 75px;
        right: 20px;
    }
    
    .back-to-top {
        bottom: 130px;
        right: 20px;
    }
}

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

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

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

/* Print Styles */
@media print {
    .navbar,
    .theme-toggle,
    .lang-toggle,
    .back-to-top,
    .hero-scroll,
    .contact-form {
        display: none !important;
    }
}