/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
    /* Colors - Light Theme */
    --primary-color: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1d4ed8;
    --secondary-color: #8b5cf6;
    --secondary-light: #a78bfa;
    --secondary-dark: #7c3aed;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    /* Neutrals */
    --white: #ffffff;
    --light-gray: #f8fafc;
    --gray: #94a3b8;
    --dark-gray: #64748b;
    --black: #1e293b;
    
    /* Backgrounds */
    --body-bg: #f1f5f9;
    --card-bg: #ffffff;
    --header-bg: rgba(255, 255, 255, 0.95);
    --footer-bg: #1e293b;
    
    /* Text */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --text-white: #ffffff;
    
    /* Borders & Shadows */
    --border-color: #e2e8f0;
    --border-radius: 12px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 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);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 1rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 3rem;
    
    /* Typography */
    --font-primary: 'Inter', sans-serif;
    --font-secondary: 'Poppins', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Z-index */
    --z-negative: -1;
    --z-normal: 1;
    --z-tooltip: 10;
    --z-fixed: 100;
    --z-modal: 1000;
    --z-notification: 10000;
}

/* Dark Theme */
[data-theme="dark"] {
    --primary-color: #3b82f6;
    --primary-light: #60a5fa;
    --primary-dark: #2563eb;
    --secondary-color: #a78bfa;
    --secondary-light: #c4b5fd;
    --secondary-dark: #8b5cf6;
    --accent-color: #22d3ee;
    
    --body-bg: #0f172a;
    --card-bg: #1e293b;
    --header-bg: rgba(30, 41, 59, 0.95);
    --footer-bg: #0f172a;
    
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-light: #94a3b8;
    
    --border-color: #334155;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
}

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

/* Custom Scroll Container */
.custom-scroll-container {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow-y: auto;
    overflow-x: auto;
}

/* Custom Scrollbar Styles */
.custom-scrollbar {
    position: fixed;
    top: 0;
    right: 0;
    width: 8px;
    height: 100vh;
    z-index: var(--z-fixed);
    pointer-events: none;
}

.scrollbar-track {
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 4px;
}

.scrollbar-thumb {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 4px;
    position: absolute;
    top: auto;
    left: auto;
    transition: transform var(--transition-fast);
    will-change: transform;
}

/* Scrollbar for Webkit browsers */
.custom-scroll-container::-webkit-scrollbar {
    width: auto;
    background: transparent;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-secondary);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

p {
    margin-bottom: var(--spacing-md);
}

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

a:hover {
    color: var(--primary-dark);
}

ul, ol {
    list-style: none;
}

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

/* ===================================
   Utility Classes
   =================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.grid {
    display: grid;
    gap: var(--spacing-xl);
}

.section {
    padding: var(--spacing-2xl) 0;
}

.section__header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section__title {
    position: relative;
    display: inline-block;
    margin-bottom: var(--spacing-sm);
}

.section__title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.section__subtitle {
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-family: var(--font-secondary);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    gap: 0.5rem;
    text-align: center;
}

.btn--primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    box-shadow: var(--shadow-md);
}

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

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

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

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

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

.loader {
    text-align: center;
    max-width: 400px;
}

.ecg-line {
    position: relative;
    width: 400px;
    height: 200px;
    margin: 0 auto 2rem;
}

.heartbeat {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
    color: var(--primary-color);
    animation: heartbeat 1.5s ease-in-out infinite;
}

.ecg-wave {
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    width: 100%;
    height: 100px;
}

@keyframes heartbeat {
    0%, 100% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-50%, -50%) scale(1.1); }
}

.loader-text {
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    width: 0%;
    animation: loading 2s ease-in-out infinite;
}

@keyframes loading {
    0% { width: 0%; }
    100% { width: 100%; }
}

/* ===================================
   Header & Navigation
   =================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--header-bg);
    backdrop-filter: blur(10px);
    z-index: var(--z-fixed);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

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

.nav {
    height: 4rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav__logo {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--primary-color);
    text-decoration: none;
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav__list {
    display: flex;
    gap: var(--spacing-lg);
}

.nav__link {
    font-weight: 500;
    color: var(--text-primary);
    position: relative;
    padding: 0.5rem 0;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    transition: width var(--transition-base);
}

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

.nav__actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Language Selector */
.language-selector {
    position: relative;
}

.lang-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-toggle:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.lang-code {
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    left: auto;
    right: auto;
    margin-top: 0.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
    z-index: var(--z-tooltip);
}

.language-selector:hover .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.75rem 1rem;
    background: transparent;
    border: none;
    color: var(--text-primary);
    text-align: left;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.lang-option:hover {
    background: var(--body-bg);
}

.lang-flag {
    font-size: 1.25rem;
}

.lang-name {
    flex: 1;
    font-size: var(--font-size-sm);
}

/* Theme Toggle */
.theme-toggle {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}
main {
    padding-top: var(--header-height);
}
/* Mobile Menu */
.nav__toggle,
.nav__close {
    display: none;
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    cursor: pointer;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 86vh;
    display: flex;
    align-items: center;
    padding-top: 4rem;
    position: relative;
    overflow: hidden;
}

.hero__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero__content {
    animation: fadeInUp 1s ease;
}

.hero__greeting {
    display: inline-block;
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.hero__name {
    font-size: var(--font-size-5xl);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--spacing-sm);
}

.hero__subtitle {
    font-size: var(--font-size-3xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.hero__description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.hero__buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero__image {
    position: relative;
    animation: fadeInRight 1s ease;
}

.image-container {
    position: relative;
    width: 100%;
    max-width: 50%;
    margin: 0 auto;
}

.main-image {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    transform: perspective(1000px) rotateY(-5deg);
    transition: transform var(--transition-base);
}

.main-image:hover {
    transform: perspective(1000px) rotateY(0deg);
}

.scan-animation {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    pointer-events: none;
}

.scan-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
    animation: scan 3s linear infinite;
}

@keyframes scan {
    0% { top: 0; }
    100% { top: 100%; }
}

.floating-elements {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
}

.float-element {
    position: absolute;
    width: 60px;
    height: 60px;
    background: var(--card-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    animation: float 3s ease-in-out infinite;
}

.float-element:nth-child(1) {
    top: 10%;
    left: -20px;
    animation-delay: 0s;
}

.float-element:nth-child(2) {
    top: 50%;
    right: -20px;
    animation-delay: 1s;
}

.float-element:nth-child(3) {
    bottom: 20%;
    left: -20px;
    animation-delay: 2s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(10deg); }
}

.hero__scroll {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    animation: bounce 2s infinite;
}

.mouse {
    width: 30px;
    height: 50px;
    border: 2px solid var(--text-secondary);
    border-radius: 15px;
    position: relative;
}

.wheel {
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--text-secondary);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% { transform: translateX(-50%) translateY(0); opacity: 1; }
    100% { transform: translateX(-50%) translateY(20px); opacity: 0; }
}

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

/* ===================================
   About Section
   =================================== */
.about__container {
    grid-template-columns: 1fr 1fr;
}

.about__description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

.about__stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.stat__card {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
}

.stat__card:hover {
    transform: translateY(-5px);
}

.stat__number {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.stat__title {
    color: var(--text-secondary);
    font-weight: 500;
}

.about__highlights {
    display: grid;
    gap: var(--spacing-lg);
}

.highlight__card {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
}

.highlight__card:hover {
    transform: translateX(5px);
}

.highlight__icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--white);
}

.highlight__content h3 {
    margin-bottom: var(--spacing-xs);
}

.highlight__content p {
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* ===================================
   Experience Section
   =================================== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline__line {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
}

.timeline__item {
    position: relative;
    margin-bottom: var(--spacing-2xl);
    width: auto;
}

.timeline__item:nth-child(odd) {
    left: 0;
    padding-right: calc(50% + 2rem);
}

.timeline__item:nth-child(even) {
    left: auto;
    padding-left: calc(50% + 2rem);
}

.timeline__item::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--card-bg);
    border: 4px solid var(--primary-color);
    border-radius: 50%;
    top: 0;
}

.timeline__item:nth-child(odd)::before {
    right: 390px;
}

.timeline__item:nth-child(even)::before {
    left: 390px;
}

.timeline__content {
    padding: var(--spacing-lg);
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
}

.timeline__date {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.timeline__title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-xs);
}

.timeline__company {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.timeline__description {
    color: var(--text-secondary);
}

/* ===================================
   Skills Section
   =================================== */
.skills__container {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
}

.skill__category {
    margin-bottom: var(--spacing-xl);
}

.skill__category-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.skill__list {
    display: grid;
    gap: var(--spacing-md);
}

.skill__item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.skill__name {
    display: flex;
    justify-content: space-between;
    font-weight: 500;
}

.skill__bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.skill__progress {
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    width: 0;
    border-radius: 4px;
    transition: width 1.5s ease;
}

.skill__cards {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.skill__card {
    perspective: 1000px;
    height: 250px;
    cursor: pointer;
}

.skill__card-front,
.skill__card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    transition: transform 0.8s;
}

.skill__card-front {
    background: var(--card-bg);
    box-shadow: var(--shadow-md);
}

.skill__card-back {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    transform: rotateY(180deg);
}

.skill__card.flipped .skill__card-front {
    transform: rotateY(180deg);
}

.skill__card.flipped .skill__card-back {
    transform: rotateY(360deg);
}

.skill__card-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.skill__card h3 {
    margin-bottom: var(--spacing-sm);
}

.skill__card p {
    color: var(--text-secondary);
    margin-bottom: 0;
}

.skill__card-back p {
    color: var(--white);
    opacity: 0.9;
}

/* ===================================
   Projects Section
   =================================== */
.projects__container {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.project__card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
}

.project__card:hover {
    transform: translateY(-10px);
}

.project__image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.project__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project__card:hover .project__image img {
    transform: scale(1.1);
}

.project__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.9), rgba(139, 92, 246, 0.9));
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.project__card:hover .project__overlay {
    opacity: 1;
}

.project__tags {
    display: flex;
    gap: 0.5rem;
}

.project__tag {
    padding: 0.25rem 0.75rem;
    background: var(--white);
    color: var(--primary-color);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.project__content {
    padding: var(--spacing-lg);
}

.project__title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

.project__description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.project__technologies {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--spacing-lg);
}

.project__technologies span {
    padding: 0.25rem 0.75rem;
    background: var(--body-bg);
    color: var(--text-secondary);
    border-radius: 20px;
    font-size: var(--font-size-sm);
}

.project__link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.project__link::after {
    content: '→';
    transition: transform var(--transition-fast);
}

.project__link:hover::after {
    transform: translateX(5px);
}

.certifications {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
}

.certifications__title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.certifications__list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.certification__item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--body-bg);
    border-radius: var(--border-radius);
    transition: transform var(--transition-fast);
}

.certification__item:hover {
    transform: translateX(5px);
}

.certification__item i {
    color: var(--primary-color);
    font-size: 1.25rem;
}

/* ===================================
   Education Section
   =================================== */
.education__timeline {
    max-width: 800px;
    margin: 0 auto;
}

.education__item {
    display: flex;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    position: relative;
}

.education__item::before {
    content: '';
    position: absolute;
    left: 148px;
    top: 20px;
    bottom: 0;
    width: 4px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.education__item:last-child::before {
    height: 50%;
}

.education__year {
    height: 58px;
    padding: var(--spacing-sm);
    background: var(--primary-color);
    color: var(--white);
    border-radius: var(--border-radius);
    text-align: center;
    font-weight: 600;
    position: relative;
    z-index: 1;
}

.education__content {
    flex: 1;
    padding: var(--spacing-lg);
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    position: relative;
}

.education__content::before {
    content: '';
    position: absolute;
    left: -49px;
    top: 20px;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 10px 20px 10px 0;
    border-color: transparent #3362ec transparent transparent;
}

.education__degree {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-xs);
}

.education__institution {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.education__description {
    color: var(--text-secondary);
}

/* ===================================
   Contact Section
   =================================== */
.contact__container {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
}

.contact__info {
    display: grid;
    gap: var(--spacing-lg);
}

.contact__card {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
}

.contact__card:hover {
    transform: translateY(-5px);
}

.contact__card-icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--white);
}

.contact__card-content h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
}

.contact__card-content a,
.contact__card-content p {
    color: var(--text-secondary);
    margin-bottom: 0;
}

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

.contact__social {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.social__link {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--card-bg);
    border-radius: 50%;
    color: var(--text-primary);
    font-size: 1.25rem;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.social__link:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    transform: translateY(-5px);
}

.contact__form {
    background: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
}

.form__group {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.form__group input,
.form__group textarea {
    width: 100%;
    padding: 1rem;
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background: var(--body-bg);
    border: 2px solid #dbd2ff;
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    resize: vertical;
}

.form__group input:focus,
.form__group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form__group label {
    position: absolute;
    top: 1rem;
    left: 1rem;
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    pointer-events: none;
    transition: all var(--transition-fast);
}

.form__group input:focus + label,
.form__group input:not(:placeholder-shown) + label,
.form__group textarea:focus + label,
.form__group textarea:not(:placeholder-shown) + label {
    top: -0.5rem;
    left: 0.75rem;
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    background: var(--card-bg);
    padding: 0 0.5rem;
}

/* ===================================
   Footer
   =================================== */
.footer {
    height: 50px;
    background: var(--footer-bg);
    color: var(--text-white);
    padding: var(--spacing-xl) 0;
}

.footer__content {
    text-align: center;
}

.footer__logo {
    display: inline-block;
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.footer__copyright {
    color: var(--text-light);
}

/* ===================================
   Back to Top Button
   =================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: var(--z-fixed);
}

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

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

/* ===================================
   Custom Cursor
   =================================== */
.cursor {
    width: 10px;
    height: 10px;
    background: var(--primary-color);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: var(--z-notification);
    transition: transform 0.1s ease;
    mix-blend-mode: difference;
}

.cursor-follower {
    width: 40px;
    height: 40px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: var(--z-notification);
    transition: all 0.3s ease;
    opacity: 0.5;
    mix-blend-mode: difference;
}

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

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

.animate {
    animation: fadeInUp 0.8s ease forwards;
}

/* ===================================
   Notification System
   =================================== */
.notification {
    position: fixed;
    top: 100px;
    right: 20px;
    background: var(--success-color);
    color: var(--white);
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
    z-index: var(--z-notification);
    animation: slideInRight 0.3s ease;
}

.notification--error {
    background: var(--danger-color);
}

.notification--warning {
    background: var(--warning-color);
}

@keyframes slideInRight {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOutRight {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(400px);
        opacity: 0;
    }
}

/* ===================================
   Responsive Design
   =================================== */

/* Large Devices (Laptops/Desktops) */
@media (max-width: 1200px) {
    .container {
        max-width: 960px;
    }
    
    .hero__name {
        font-size: var(--font-size-4xl);
    }
    
    .hero__subtitle {
        font-size: var(--font-size-2xl);
    }
}

/* Medium Devices (Tablets) */
@media (max-width: 968px) {
    .container {
        max-width: 720px;
    }
    
    /* Grid Adjustments */
    .hero__container,
    .about__container,
    .contact__container,
    .skills__container {
        grid-template-columns: 1fr;
    }
    
    .about__stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .projects__container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .certifications__list {
        grid-template-columns: 1fr;
    }
    
    /* Timeline Adjustments */
    .timeline__line {
        left: 30px;
    }
    
    .timeline__item,
    .timeline__item:nth-child(odd),
    .timeline__item:nth-child(even) {
        width: 100%;
        left: 0;
        padding: 0 0 0 60px;
    }
    
    .timeline__item::before {
        left: 20px;
    }
    
    .timeline__item:nth-child(odd)::before,
    .timeline__item:nth-child(even)::before {
        left: 12px;
    }
    
    /* Education Timeline */
    .education__item {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .education__item::before {
        left: 50px;
    }
    
    .education__year {
        width: auto;
        align-self: flex-start;
    }
    
    /* Navigation */
    .nav__menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 400px;
        height: 100vh;
        background: var(--card-bg);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-2xl);
        transition: right var(--transition-base);
        box-shadow: var(--shadow-xl);
        z-index: var(--z-modal);
    }
    
    .nav__menu.show-menu {
        right: 0;
    }
    
    .nav__list {
        flex-direction: column;
        width: 100%;
    }
    
    .nav__actions {
        width: 100%;
        justify-content: center;
    }
    
    .nav__toggle,
    .nav__close {
        display: block;
    }
    
    .nav__close {
        position: absolute;
        top: var(--spacing-md);
        right: var(--spacing-md);
    }
    
    /* Hide custom cursor on mobile */
    .cursor,
    .cursor-follower {
        display: none;
    }
    
    /* Custom Scrollbar */
    .custom-scrollbar {
        display: none;
    }
    
    .custom-scroll-container {
        overflow-y: scroll;
    }
    
    .custom-scroll-container::-webkit-scrollbar {
        width: 8px;
        background: var(--border-color);
    }
    
    .custom-scroll-container::-webkit-scrollbar-thumb {
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        border-radius: 4px;
    }
}

/* Small Devices (Phones) */
@media (max-width: 576px) {
    :root {
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
        --font-size-2xl: 1.25rem;
        --font-size-xl: 1.125rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .hero {
        min-height: auto;
        padding-top: 6rem;
    }
    
    .hero__buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
    }
    
    .about__stats {
        grid-template-columns: 1fr;
    }
    
    .projects__container {
        grid-template-columns: 1fr;
    }
    
    .skill__cards {
        grid-template-columns: 1fr;
    }
    
    .ecg-line {
        width: 300px;
    }
    
    .hero__image .image-container {
        max-width: 300px;
    }
    
    .float-element {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    .highlight__card,
    .contact__card {
        flex-direction: column;
        text-align: center;
    }
    
    .highlight__icon {
        margin: 0 auto;
    }
    
    .contact__social {
        justify-content: center;
    }
    
    /* Timeline adjustments for mobile */
    .timeline__item {
        padding-left: 40px;
    }
    
    .timeline__line {
        left: 20px;
    }
    
    .timeline__item::before {
        left: 12px;
        width: 16px;
        height: 16px;
    }
    
    /* Language dropdown */
    .lang-dropdown {
        position: auto;
        top: auto;
        bottom: 0;
        left: auto;
        right: auto;
        margin: 0;
        border-radius: var(--border-radius) var(--border-radius) 0 0;
        transform: translateY(100%);
        max-height: 60vh;
        overflow-y: auto;
    }
    
    .language-selector:hover .lang-dropdown {
        transform: translateY(0);
    }
    
    .lang-option {
        padding: 1rem;
    }
    
    /* Back to top button */
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}

/* Extra Small Devices */
@media (max-width: 380px) {
    .hero__name {
        font-size: 1.75rem;
    }
    
    .hero__subtitle {
        font-size: 1.25rem;
    }
    
    .section__title {
        font-size: 1.5rem;
    }
    
    .stat__number {
        font-size: 2rem;
    }
    
    .project__technologies {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Orientation Specific */
@media (max-height: 600px) and (orientation: landscape) {
    .hero {
        min-height: auto;
        padding: 6rem 0 3rem;
    }
    
    .hero__container {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-lg);
    }
    
    .hero__content {
        padding-top: 0;
    }
    
    .hero__greeting {
        font-size: var(--font-size-base);
    }
    
    .hero__name {
        font-size: var(--font-size-2xl);
    }
    
    .hero__subtitle {
        font-size: var(--font-size-xl);
    }
    
    .hero__description {
        font-size: var(--font-size-base);
        margin-bottom: var(--spacing-md);
    }
    
    .hero__buttons {
        gap: var(--spacing-sm);
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: var(--font-size-sm);
    }
    
    .image-container {
        max-width: 300px;
    }
}

/* High DPI Screens */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    body {
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
}

/* Print Styles */
@media print {
    .loading-screen,
    .nav__toggle,
    .nav__close,
    .theme-toggle,
    .language-selector,
    .hero__scroll,
    .back-to-top,
    .cursor,
    .cursor-follower,
    .custom-scrollbar {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .container {
        max-width: 100%;
        padding: 0;
    }
    
    .section {
        padding: 1rem 0;
        page-break-inside: avoid;
    }
    
    a {
        color: black;
        text-decoration: underline;
    }
    
    .btn {
        display: none;
    }
    
    .project__card:hover,
    .skill__card:hover,
    .contact__card:hover {
        transform: none;
        box-shadow: none;
    }
}


/* Certifications Slider */
.certifications-slider {
    width: 100%;
    overflow: hidden;
    padding: 3rem 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
    border-radius: 20px;
    position: relative;
}

.certifications-slider::before,
.certifications-slider::after {
    content: '';
    position: absolute;
    top: 0;
    width: 100px;
    height: 100%;
    z-index: 2;
    pointer-events: none;
}

.certifications-slider::before {
    left: 0;
    background: linear-gradient(to right, var(--bg-color) 0%, transparent 100%);
}

.certifications-slider::after {
    right: 0;
    background: linear-gradient(to left, var(--bg-color) 0%, transparent 100%);
}

.certifications-track {
    display: flex;
    gap: 3rem;
    animation: scrolll 50s linear infinite;
    white-space: nowrap;
}

.certifications-track:hover {
    animation-play-state: paused;
}

.certification-logo {
    flex-shrink: 0;
    width: 150px;
    height: 80px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.certification-logo:hover {
    transform: translateY(-10px) scale(1.1);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    border-color: var(--primary-color);
}

.certification-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    filter: grayscale(100%);
    opacity: 0.7;
    transition: all 0.3s ease;
}

.certification-logo:hover img {
    filter: grayscale(0%) brightness(1) invert(0);
    opacity: 1;
}

@keyframes scrolll {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(calc(-150px * 12 - 3rem * 12));
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .certification-logo {
        width: 120px;
        height: 60px;
        padding: 0.75rem;
    }
    
    .certifications-track {
        gap: 2rem;
        animation-duration: 35s;
    }
    
    @keyframes scrolll {
        0% {
            transform: translateX(0);
        }
        100% {
            transform: translateX(calc(-120px * 12 - 2rem * 12));
        }
    }
    
    .certifications-slider::before,
    .certifications-slider::after {
        width: 50px;
    }
}

@media (max-width: 480px) {
    .certification-logo {
        width: 100px;
        height: 50px;
        padding: 0.5rem;
    }
    
    .certifications-track {
        gap: 1.5rem;
        animation-duration: 30s;
    }
    
    @keyframes scrolll {
        0% {
            transform: translateX(0);
        }
        100% {
            transform: translateX(calc(-100px * 12 - 1.5rem * 12));
        }
    }
    
    .certifications-slider {
        padding: 2rem 0;
    }
}

/* Dark/Light Mode Support */
[data-theme="light"] .certification-logo {
    background: rgba(0, 0, 0, 0.03);
    border-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .certification-logo:hover {
    background: rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .certification-logo img {
    filter: grayscale(100%) brightness(1) invert(0);
    opacity: 0.6;
}

[data-theme="light"] .certification-logo:hover img {
    filter: grayscale(0%) brightness(1) invert(0);
    opacity: 1;
}

[data-theme="light"] .certifications-slider::before {
    background: linear-gradient(to right, #ffffff 0%, transparent 100%);
}

[data-theme="light"] .certifications-slider::after {
    background: linear-gradient(to left, #ffffff 0%, transparent 100%);
}

/* در بخش دوم CSS (بعد از متغیرها) اضافه کنید: */

/* غیرفعال کردن انتخاب متن */
body {
    -webkit-user-select: none; /* Safari */
    -moz-user-select: none;    /* Firefox */
    -ms-user-select: none;     /* Internet Explorer/Edge */
    user-select: none;         /* Non-prefixed version, currently supported by Chrome, Opera and Firefox */
}

/* استثنا برای قسمت‌هایی که باید قابل کپی باشند */
.allow-copy {
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
}

/* مخفی کردن تصاویر هنگام کشیدن */
img {
    pointer-events: none;
}

/* نوتیفیکیشن */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 20px;
    border-radius: 8px;
    background: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 9999;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    animation: slideIn 0.3s ease;
    max-width: 300px;
}

.notification.warning {
    background: #ff9800;
}

.notification.success {
    background: #4caf50;
}

.notification i {
    font-size: 1.2rem;
}

.notification-close {
    background: transparent;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    margin-left: auto;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}