/* ==========================================================================
   DESIGN TOKENS & VARIABLE DECLARATIONS
   ========================================================================== */
:root {
    /* Fonts */
    --font-primary: 'Poppins', sans-serif;
    --font-heading: 'Poppins', sans-serif;

    /* Transition Speeds */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

    /* Spacing Scale */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-xxl: 5rem;

    /* Theme colors - DARK THEME DEFAULT */
    --bg-primary: #090d16;          /* Solid Dark Blue-Black */
    --bg-primary-rgb: 9, 13, 22;
    --bg-secondary: #0d1220;
    --bg-card: #0f172a;             /* Solid Dark Blue card */
    --bg-card-hover: #1e293b;
    
    --border-color: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);
    
    --text-primary: #ffffff;        /* Pure White font */
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    /* Accents - Strict Dark Blue / White / Black */
    --color-primary: #3b82f6;       /* Medium Dark Blue */
    --color-primary-rgb: 59, 130, 246;
    --color-secondary: #1d4ed8;     /* Royal Dark Blue */
    --color-accent-security: #3b82f6; /* Slate Blue */
    --color-accent-web: #ffffff;      /* White accent */
    --color-accent-rnd: #94a3b8;      /* Steel Blue */
    --color-accent-mgmt: #1d4ed8;     /* Royal Blue */
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.4);
    
    --header-height: 80px;
    --border-radius-sm: 6px;
    --border-radius-md: 12px;
    --border-radius-lg: 18px;
}

/* Light Theme Variables overrides */
body.light-theme {
    --bg-primary: #ffffff;          /* Pure White Background */
    --bg-primary-rgb: 255, 255, 255;
    --bg-secondary: #f8fafc;
    --bg-card: #f8fafc;             /* Very Soft Grey Card */
    --bg-card-hover: #f1f5f9;
    
    --border-color: rgba(9, 13, 22, 0.08);
    --border-hover: rgba(9, 13, 22, 0.15);
    
    --text-primary: #090d16;        /* Solid Dark Blue-Black font */
    --text-secondary: #475569;
    --text-muted: #64748b;
    
    --color-primary: #090d16;       /* Solid Black */
    --color-primary-rgb: 9, 13, 22;
    --color-secondary: #1d4ed8;     /* Royal Dark Blue */
    --color-accent-security: #090d16;
    --color-accent-web: #1d4ed8;
    --color-accent-rnd: #475569;
    --color-accent-mgmt: #1e40af;
    
    --shadow-sm: 0 2px 8px rgba(9, 13, 22, 0.04);
    --shadow-md: 0 8px 24px rgba(9, 13, 22, 0.06);
    --shadow-lg: 0 16px 40px rgba(9, 13, 22, 0.08);
}

/* ==========================================================================
   GLOBAL RESET & STYLING
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
}

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

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

ul {
    list-style: none;
}

button, input, textarea {
    font-family: inherit;
    font-size: inherit;
    border: none;
    background: none;
    outline: none;
}

button {
    cursor: pointer;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--border-radius-sm);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ==========================================================================
   LAYOUT REUSABLE COMPONENTS
   ========================================================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.section-tag {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-secondary);
    margin-bottom: var(--space-xs);
    display: inline-block;
}

body.light-theme .section-tag {
    color: var(--color-secondary);
}

.section-title {
    font-size: 2.25rem;
    color: var(--text-primary);
    font-weight: 800;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.75rem;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    font-family: var(--font-heading);
    transition: all var(--transition-normal);
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--color-secondary);
    color: #ffffff;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border: 2px solid var(--text-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

body.light-theme .btn-primary {
    background-color: #090d16;
    color: #ffffff;
}

body.light-theme .btn-primary:hover {
    background-color: #ffffff;
    color: #090d16;
    border-color: #090d16;
}

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

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

.btn-icon {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-normal);
}

.btn-primary:hover .btn-icon {
    transform: translateX(3px);
}

.text-link {
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-block;
    margin-top: var(--space-xs);
}

body.light-theme .text-link {
    color: var(--color-secondary);
}

.text-link:hover {
    color: var(--color-secondary);
    text-decoration: underline;
}

/* ==========================================================================
   STICKY HEADER & NAVIGATION
   ========================================================================== */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    display: flex;
    align-items: center;
    z-index: 1000;
    transition: all var(--transition-normal);
    border-bottom: 1px solid transparent;
}

.main-header.scrolled {
    height: 70px;
    background-color: var(--bg-primary);
    border-bottom-color: var(--border-color);
    box-shadow: var(--shadow-sm);
}

.header-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.logo-accent {
    color: var(--color-secondary);
}

body.light-theme .logo-accent {
    color: #090d16;
}

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

.nav-list {
    display: flex;
    gap: var(--space-lg);
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 0.5rem 0;
}

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

body.light-theme .nav-link::after {
    background-color: #090d16;
}

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

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

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

/* Language selector */
.lang-selector {
    display: flex;
    gap: 2px;
    margin-right: 0.25rem;
    border-right: 1px solid var(--border-color);
    padding-right: 0.5rem;
}

.lang-btn {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.lang-btn:hover {
    color: var(--text-primary);
    background-color: var(--border-color);
}

.lang-btn.active {
    color: var(--text-primary);
    background-color: var(--border-color);
    font-weight: 800;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    color: var(--text-primary);
    border-color: var(--text-primary);
    background-color: var(--border-color);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
}

body.dark-theme .moon-icon {
    display: none;
}

body.light-theme .sun-icon {
    display: none;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.mobile-toggle .bar {
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

/* Mobile Nav Active */
.mobile-toggle.active .bar:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

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

.mobile-toggle.active .bar:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
    position: relative;
    padding-top: calc(var(--header-height) + var(--space-xxl));
    padding-bottom: var(--space-xxl);
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero-container-grid {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: var(--space-xl);
    align-items: center;
    width: 100%;
}

.hero-image-column {
    display: flex;
    justify-content: center;
    align-items: center;
    order: 2;
}

.hero-image-wrapper {
    position: relative;
    width: 384px;
    height: 460px;
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.hero-profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: 18% 5%;
    display: block;
}

.hero-image-wrapper:hover {
    border-color: var(--color-primary);
}

body.light-theme .hero-image-wrapper:hover {
    border-color: var(--color-secondary);
}



.hero-content {
    max-width: 800px;
    order: 1;
}

.badge-container {
    margin-bottom: var(--space-md);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    border-radius: var(--border-radius-sm);
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
}

body.light-theme .hero-badge {
    color: var(--color-secondary);
    background-color: var(--bg-secondary);
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 1.65rem;
    font-weight: 600;
    color: var(--text-secondary);
    line-height: 1.35;
    margin-bottom: var(--space-md);
}

body.light-theme .hero-subtitle {
    color: var(--color-secondary);
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    max-width: 700px;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.hero-socials {
    display: flex;
    gap: var(--space-sm);
}

.social-link {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.social-link:hover {
    color: var(--text-primary);
    border-color: var(--text-primary);
    background-color: var(--bg-primary);
    transform: translateY(-3px);
}

body.light-theme .social-link:hover {
    background-color: #090d16;
    color: #ffffff;
}

.social-link svg {
    width: 18px;
    height: 18px;
}

/* ==========================================================================
   STATS SECTION
   ========================================================================== */
.stats-section {
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
}

.stat-card {
    display: flex;
    flex-direction: column;
    padding: var(--space-md);
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: var(--text-secondary);
}

.stat-icon-wrapper {
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-sm);
    background-color: var(--border-color);
    color: var(--text-primary);
}

.stat-icon-wrapper svg {
    width: 20px;
    height: 20px;
}

body.light-theme .stat-icon-wrapper {
    background-color: #090d16;
    color: #ffffff;
}

.stat-number {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ==========================================================================
   EXPERIENCE TIMELINE SECTION (WITH FILTERS)
   ========================================================================== */
.experience-section {
    padding: var(--space-xxl) 0;
}

.timeline-filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-top: var(--space-md);
}

.filter-btn {
    padding: 0.5rem 1.25rem;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.filter-btn:hover {
    color: var(--text-primary);
    border-color: var(--text-primary);
}

.filter-btn.active {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
    color: #ffffff;
}

body.light-theme .filter-btn.active {
    background-color: #090d16;
    border-color: #090d16;
    color: #ffffff;
}

.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding-left: 2rem;
    margin-top: var(--space-xl);
}

.timeline::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 7px;
    width: 2px;
    background-color: var(--border-color);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--space-xl);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.timeline-item.hidden {
    display: none;
}

.timeline-item.fade-out {
    opacity: 0;
    transform: translateY(10px);
}

.timeline-item.fade-in {
    opacity: 1;
    transform: translateY(0);
    animation: timelineItemReveal 0.4s ease forwards;
}

@keyframes timelineItemReveal {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.timeline-dot {
    position: absolute;
    left: -2rem;
    top: 8px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--bg-primary);
    border: 3px solid var(--color-primary);
    z-index: 1;
    transition: transform var(--transition-fast);
}

.timeline-item:hover .timeline-dot {
    transform: scale(1.3);
}

body.light-theme .timeline-dot {
    border-color: #090d16;
    background-color: #ffffff;
}

.timeline-date {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-xs);
}

body.light-theme .timeline-date {
    color: var(--color-secondary);
}

.timeline-content {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: var(--space-md) var(--space-lg);
    transition: all var(--transition-normal);
}

.timeline-item:hover .timeline-content {
    border-color: var(--text-secondary);
}

.timeline-content-header {
    margin-bottom: var(--space-sm);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.job-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
}

.company-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
}

body.light-theme .company-name {
    color: var(--text-muted);
}

.job-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--space-md);
}

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

.tag-chip {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius-sm);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

body.light-theme .tag-chip {
    color: var(--text-primary);
}

/* ==========================================================================
   SKILLS SECTION
   ========================================================================== */
.skills-section {
    padding: var(--space-xxl) 0;
    background-color: var(--bg-secondary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.skill-category-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: var(--space-lg);
    transition: all var(--transition-normal);
}

.skill-category-card:hover {
    border-color: var(--text-secondary);
}

.category-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.category-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--border-color);
    color: var(--text-primary);
}

.category-icon svg {
    width: 18px;
    height: 18px;
}

body.light-theme .category-icon {
    background-color: #090d16;
    color: #ffffff;
}

.category-header h3 {
    font-size: 1.15rem;
    font-weight: 700;
}

.skill-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.skill-list li {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.skill-list li span {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.skill-bar {
    width: 100%;
    height: 5px;
    background-color: var(--border-color);
    border-radius: 9999px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background-color: var(--color-primary);
}

body.light-theme .skill-progress {
    background-color: var(--color-secondary);
}

.additional-skills {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.additional-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: var(--space-lg);
}

.additional-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.languages-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
}

.lang-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.65rem 0.85rem;
    border-radius: var(--border-radius-sm);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
}

.lang-name {
    font-weight: 700;
    font-size: 0.85rem;
}

.lang-level {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.chips-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.method-chip {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.5rem 0.85rem;
    border-radius: var(--border-radius-sm);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.method-chip:hover {
    border-color: var(--text-primary);
}

/* ==========================================================================
   EDUCATION & CERTIFICATIONS SECTION
   ========================================================================== */
.education-section {
    padding: var(--space-xxl) 0;
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.education-card {
    display: flex;
    gap: var(--space-md);
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: var(--space-lg);
    transition: all var(--transition-normal);
}

.education-card:hover {
    border-color: var(--text-secondary);
}

.edu-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--border-color);
    color: var(--text-primary);
    flex-shrink: 0;
}

.edu-icon svg {
    width: 20px;
    height: 20px;
}

body.light-theme .edu-icon {
    background-color: #090d16;
    color: #ffffff;
}

.edu-details {
    flex-grow: 1;
}

.edu-date {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-xs);
    display: inline-block;
}

body.light-theme .edu-date {
    color: var(--color-secondary);
}

.education-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.edu-specialty {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.edu-school {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Certifications Box styling */
.certifications-box {
    margin-top: var(--space-xl);
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: var(--space-lg) var(--space-xl);
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.certifications-box h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    color: var(--text-primary);
}

.certs-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.certs-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: 0.4rem 0;
}

.cert-check {
    width: 16px;
    height: 16px;
    color: var(--color-primary);
    margin-top: 4px;
    flex-shrink: 0;
}

body.light-theme .cert-check {
    color: var(--color-secondary);
}

.certs-list li div {
    display: flex;
    flex-direction: column;
}

.certs-list li strong {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
}

.certs-list li span {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */
.contact-section {
    padding: var(--space-xxl) 0;
    background-color: var(--bg-secondary);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-xl);
    align-items: start;
}

.contact-info-panel h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.contact-info-panel > p {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.contact-details-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.contact-icon-box {
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--color-primary);
    flex-shrink: 0;
}

body.light-theme .contact-icon-box {
    background-color: #ffffff;
    color: #090d16;
}

.contact-icon-box svg {
    width: 18px;
    height: 18px;
}

.contact-item h4 {
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    font-weight: 700;
}

.contact-item a, .contact-item span {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

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

body.light-theme .contact-item a:hover {
    color: var(--color-secondary);
}

.contact-form-panel {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: var(--space-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: var(--space-md);
    position: relative;
}

.form-group label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

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

body.light-theme .form-group input:focus, body.light-theme .form-group textarea:focus {
    border-color: #090d16;
}

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

.error-msg {
    font-size: 0.75rem;
    color: #ef4444;
    font-weight: 600;
    display: none;
    margin-top: 2px;
}

.form-group.invalid .error-msg {
    display: block;
}

.btn-submit {
    width: 100%;
    cursor: pointer;
}

.form-status {
    margin-top: var(--space-sm);
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    display: none;
    text-align: center;
}

.form-status.success {
    display: block;
    background-color: rgba(16, 185, 129, 0.1);
    color: #10b981;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.form-status.error {
    display: block;
    background-color: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* ==========================================================================
   FOOTER SECTION
   ========================================================================== */
.main-footer {
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-primary);
}

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

.footer-content p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

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

body.light-theme .footer-content a:hover {
    color: var(--color-secondary);
}

.footer-links {
    display: flex;
    gap: var(--space-md);
}

.footer-links a {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

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

/* ==========================================================================
   BACK TO TOP PROGRESS BUTTON
   ========================================================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-normal);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: var(--color-primary);
    color: #ffffff;
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

body.light-theme .back-to-top:hover {
    background-color: #090d16;
    color: #ffffff;
    border-color: #090d16;
}

.progress-ring {
    position: absolute;
    top: 0;
    left: 0;
    transform: rotate(-90deg);
}

.progress-ring-circle {
    transition: stroke-dashoffset 0.1s linear;
    stroke-dasharray: 138.23; /* 2 * PI * r (22) = 138.23 */
    stroke-dashoffset: 138.23;
    color: var(--color-primary);
}

body.light-theme .progress-ring-circle {
    color: #090d16;
}

.back-to-top:hover .progress-ring-circle {
    color: #ffffff;
}

.arrow-icon {
    width: 18px;
    height: 18px;
    z-index: 2;
    transition: transform var(--transition-fast);
}

.back-to-top:hover .arrow-icon {
    transform: translateY(-2px);
}

.mobile-menu-footer {
    display: none;
}

/* ==========================================================================
   RESPONSIVE DESIGN BREAKPOINTS
   ========================================================================== */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .additional-skills {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }
    
    .section-title {
        font-size: 1.85rem;
    }

    .hero-container-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
        text-align: left;
    }

    .hero-image-column {
        order: 1;
        justify-content: flex-start;
    }

    .hero-image-wrapper {
        width: 100%;
        max-width: 100%;
        height: 380px;
    }

    .hero-content {
        order: 2;
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        max-width: 100%;
    }
    
    .hero-title {
        font-size: 2.75rem;
    }
    
    .hero-subtitle {
        font-size: 1.35rem;
    }
    
    .hero-description {
        font-size: 1rem;
        margin-left: 0;
        margin-right: 0;
    }

    .hero-cta {
        justify-content: flex-start;
    }

    .hero-socials {
        justify-content: flex-start;
    }

    /* Mobile Menu Toggle */
    .mobile-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--bg-primary);
        padding: var(--space-xl) var(--space-md) var(--space-lg);
        display: flex;
        flex-direction: column;
        align-items: center;
        transform: translateX(100%);
        transition: transform var(--transition-normal);
        border-top: 1px solid var(--border-color);
        z-index: 999;
        overflow-y: auto;
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-list {
        flex-direction: column;
        align-items: center;
        gap: var(--space-lg);
        margin-bottom: var(--space-lg);
    }

    .mobile-menu-footer {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: var(--space-md);
        margin-top: auto;
        width: 100%;
        border-top: 1px solid var(--border-color);
        padding-top: var(--space-md);
    }

    .mobile-contact-details {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 0.25rem;
    }

    .mobile-contact-link {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        font-size: 16px;
        color: var(--text-secondary);
        font-weight: 600;
    }

    .mobile-contact-link svg {
        width: 16px;
        height: 16px;
        color: var(--color-secondary);
    }

    body.light-theme .mobile-contact-link svg {
        color: #090d16;
    }

    .mobile-menu-socials {
        display: flex;
        gap: var(--space-xs);
    }

    .mobile-menu-socials .social-link {
        width: 36px;
        height: 36px;
        border-radius: var(--border-radius-sm);
    }

    .mobile-menu-socials .social-link svg {
        width: 16px;
        height: 16px;
    }
    
    .nav-link {
        font-size: 1.25rem;
    }
    
    /* Timeline Mobile adjustments */
    .timeline::after {
        left: 0;
    }
    .timeline-dot {
        left: -2.35rem;
    }
    .timeline {
        padding-left: 2.5rem;
    }
    
    .timeline-content-header {
        flex-direction: column;
    }
    
    /* Education Grid */
    .education-grid {
        grid-template-columns: 1fr;
    }
    
    /* Contact Grid */
    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .certifications-box {
        padding: var(--space-md) var(--space-lg);
    }
}

@media (max-width: 480px) {
    html, body {
        overflow-x: hidden;
    }

    .header-container {
        padding: 0 var(--space-md);
    }

    .logo {
        font-size: 1.25rem;
    }

    .lang-selector {
        gap: 0;
        padding-right: 0.25rem;
        margin-right: 0.15rem;
    }

    .lang-btn {
        font-size: 0.68rem;
        padding: 0.15rem 0.3rem;
    }

    .theme-toggle {
        width: 32px;
        height: 32px;
    }

    .theme-toggle svg {
        width: 14px;
        height: 14px;
    }

    .hero-image-wrapper {
        width: 100%;
        max-width: 100%;
        height: 340px;
    }

    .hero-title {
        font-size: 2rem;
        word-break: break-word;
    }

    .hero-description {
        font-size: 0.95rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .languages-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline {
        padding-left: 1.5rem;
    }

    .timeline::after {
        left: 7px;
    }

    .timeline-dot {
        left: -1.45rem;
        width: 12px;
        height: 12px;
        top: 8px;
    }

    .timeline-content {
        padding: 1rem;
    }

    .skill-category-card {
        padding: 1.25rem 1rem;
    }

    .additional-card {
        padding: 1rem;
    }

    .certifications-box {
        padding: 1rem;
    }

    .education-card {
        padding: 1rem;
    }

    .contact-form-panel {
        padding: 1.25rem 1rem;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: left;
        align-items: flex-start;
    }
    
    .footer-links {
        justify-content: flex-start;
        flex-wrap: wrap;
    }
}