/* ============================================
   CSS CUSTOM PROPERTIES (Variables)
============================================ */
:root {
    /* Colors - Light Theme */
    --color-primary: #6C63FF;
    --color-primary-dark: #5A52D5;
    --color-primary-light: #8B85FF;
    --color-primary-rgb: 108, 99, 255;
    
    --color-bg: #FFFFFF;
    --color-bg-secondary: #F8F9FA;
    --color-bg-tertiary: #F0F2F5;
    
    --color-text: #1A1A2E;
    --color-text-secondary: #4A4A68;
    --color-text-muted: #6C6C8A;
    
    --color-border: #E1E4E8;
    --color-border-light: #F0F2F5;
    
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    
    --color-white: #FFFFFF;
    --color-black: #000000;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'Fira Code', 'Courier New', monospace;
    
    --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: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-primary: 0 10px 40px -10px rgba(var(--color-primary-rgb), 0.5);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* Z-Index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-tooltip: 600;
    
    /* Layout */
    --container-max: 1200px;
    --header-height: 80px;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-bg: #0F0F1A;
    --color-bg-secondary: #1A1A2E;
    --color-bg-tertiary: #25253D;
    
    --color-text: #FFFFFF;
    --color-text-secondary: #B8B8D0;
    --color-text-muted: #8888A0;
    
    --color-border: #2D2D45;
    --color-border-light: #25253D;
    
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.no-scroll {
    overflow: hidden;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul, ol {
    list-style: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* ============================================
   UTILITY CLASSES
============================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-4xl) 0;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ============================================
   PRELOADER
============================================ */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

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

.loader {
    position: relative;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loader::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loader-text {
    font-family: var(--font-mono);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

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

/* ============================================
   HEADER & NAVIGATION
============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: transparent;
    z-index: var(--z-fixed);
    transition: all var(--transition-base);
}

.header.scrolled {
    background-color: var(--color-bg);
    box-shadow: var(--shadow-md);
    height: 70px;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 2px;
}

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

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

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

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    position: relative;
    padding: var(--spacing-sm) 0;
    transition: color var(--transition-fast);
}

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

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

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

.nav-buttons {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.theme-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background-color: var(--color-bg-secondary);
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.nav-toggle,
.nav-close {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    color: var(--color-text);
    cursor: pointer;
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 400px;
        height: 100vh;
        background-color: var(--color-bg);
        flex-direction: column;
        justify-content: center;
        padding: var(--spacing-2xl);
        box-shadow: var(--shadow-2xl);
        transition: right var(--transition-base);
        z-index: var(--z-modal);
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .nav-link {
        font-size: var(--font-size-lg);
    }

    .nav-close {
        display: flex;
        position: absolute;
        top: var(--spacing-lg);
        right: var(--spacing-lg);
    }

    .nav-toggle {
        display: flex;
    }
}

/* ============================================
   BUTTONS
============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 15px 50px -10px rgba(var(--color-primary-rgb), 0.6);
}

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

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background-color: rgba(var(--color-primary-rgb), 0.05);
}

.btn i {
    font-size: var(--font-size-base);
    transition: transform var(--transition-fast);
}

.btn:hover i {
    transform: translateX(4px);
}

/* ============================================
   HERO SECTION
============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: var(--header-height);
}

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

.hero-gradient {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(var(--color-primary-rgb), 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(var(--color-primary-rgb), 0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(var(--color-primary-rgb), 0.05) 0%, transparent 70%);
}

.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 6px;
    height: 6px;
    background-color: var(--color-primary);
    border-radius: 50%;
    opacity: 0.3;
    animation: float 15s infinite ease-in-out;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) translateX(0);
    }
    25% {
        transform: translateY(-30px) translateX(20px);
    }
    50% {
        transform: translateY(-15px) translateX(-10px);
    }
    75% {
        transform: translateY(-40px) translateX(15px);
    }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-data {
    max-width: 600px;
}

.hero-greeting {
    display: inline-block;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, var(--font-size-6xl));
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-lg);
}

.hero-title-accent {
    display: block;
    color: var(--color-primary);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-2xl);
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

.stat-number::after {
    content: '+';
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* Hero Image */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-img-wrapper {
    position: relative;
    width: 400px;
    height: 400px;
}

.hero-img-bg {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: 50%;
    opacity: 0.1;
    animation: pulse 4s ease-in-out infinite;
}

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

.hero-img-placeholder {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, var(--color-bg-secondary), var(--color-bg-tertiary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 80px;
    color: var(--color-primary);
    box-shadow: var(--shadow-xl);
}

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

.floating-element {
    position: absolute;
    width: 50px;
    height: 50px;
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    box-shadow: var(--shadow-lg);
    animation: floatElement 6s ease-in-out infinite;
}

.floating-element.el-1 {
    top: 10%;
    left: 0;
    color: #61DAFB;
    animation-delay: 0s;
}

.floating-element.el-2 {
    top: 60%;
    left: -10%;
    color: #68A063;
    animation-delay: 1.5s;
}

.floating-element.el-3 {
    top: 20%;
    right: 0;
    color: #F7DF1E;
    animation-delay: 3s;
}

.floating-element.el-4 {
    bottom: 10%;
    right: 10%;
    color: #E34F26;
    animation-delay: 4.5s;
}

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

/* Hero Scroll Indicator */
.hero-scroll {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
}

.scroll-down {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

.scroll-down:hover {
    color: var(--color-primary);
}

.scroll-icon {
    animation: bounce 2s infinite;
}

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

/* Hero Social */
.hero-social {
    position: absolute;
    left: var(--spacing-xl);
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.hero-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.hero-social a:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    transform: translateX(5px);
}

/* Hero Responsive */
@media (max-width: 992px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-data {
        max-width: 100%;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-image {
        display: none;
    }

    .hero-social {
        display: none;
    }
}

@media (max-width: 576px) {
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
}

/* ============================================
   SECTION HEADERS
============================================ */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-3xl);
}

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

.section-title {
    font-size: clamp(2rem, 4vw, var(--font-size-4xl));
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.section-line {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    margin: 0 auto var(--spacing-lg);
    border-radius: var(--radius-full);
}

.section-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

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

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    margin-bottom: var(--spacing-3xl);
}

.about-image {
    position: relative;
}

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

.about-img-placeholder {
    width: 100%;
    aspect-ratio: 4/5;
    background: linear-gradient(135deg, var(--color-bg), var(--color-bg-tertiary));
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 100px;
    color: var(--color-primary);
    box-shadow: var(--shadow-xl);
}

.about-img-border {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 100%;
    height: 100%;
    border: 3px solid var(--color-primary);
    border-radius: var(--radius-2xl);
    z-index: -1;
}

.about-experience-badge {
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    box-shadow: var(--shadow-lg);
}

.experience-number {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    line-height: 1;
}

.experience-text {
    font-size: var(--font-size-xs);
    text-align: center;
    padding: 0 var(--spacing-sm);
}

.about-data {
    max-width: 600px;
}

.about-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
}

.about-description {
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-md);
}

.about-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background-color: var(--color-bg);
    border-radius: var(--radius-xl);
}

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

.info-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.info-value {
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
}

.info-value.available {
    color: var(--color-success);
}

.about-buttons {
    display: flex;
    gap: var(--spacing-md);
}

/* Skills Section */
.skills-section {
    margin-top: var(--spacing-3xl);
}

.skills-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

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

.skill-category {
    background-color: var(--color-bg);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.category-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
}

.category-title i {
    color: var(--color-primary);
}

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

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

.skill-info {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-sm);
}

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

.skill-percent {
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
}

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

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--radius-full);
    width: 0;
    transition: width 1.5s ease-out;
}

/* Tech Stack */
.tech-stack {
    margin-top: var(--spacing-2xl);
    text-align: center;
}

.tech-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-lg);
}

.tech-icons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.tech-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-2xl);
    color: var(--color-text-secondary);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
    position: relative;
    cursor: pointer;
}

.tech-icon:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    color: var(--color-primary);
}

.tech-icon::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-text);
    color: var(--color-bg);
    font-size: var(--font-size-xs);
    border-radius: var(--radius-sm);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

.tech-icon:hover::after {
    opacity: 1;
    visibility: visible;
}

/* About Responsive */
@media (max-width: 992px) {
    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .about-data {
        max-width: 100%;
    }

    .about-buttons {
        justify-content: center;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .about-info {
        grid-template-columns: 1fr;
    }

    .about-buttons {
        flex-direction: column;
    }
}

/* ============================================
   SERVICES SECTION
============================================ */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.service-card {
    background-color: var(--color-bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

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

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

.service-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(var(--color-primary-rgb), 0.1), rgba(var(--color-primary-rgb), 0.05));
    border-radius: var(--radius-lg);
    font-size: var(--font-size-2xl);
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    transition: all var(--transition-base);
}

.service-card:hover .service-icon {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--color-white);
}

.service-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.service-description {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-lg);
}

.service-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

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

.service-features li i {
    color: var(--color-success);
    font-size: var(--font-size-xs);
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    transition: gap var(--transition-fast);
}

.service-link:hover {
    gap: var(--spacing-md);
}

/* Services Responsive */
@media (max-width: 992px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .services-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   PORTFOLIO SECTION
============================================ */
.portfolio {
    background-color: var(--color-bg-secondary);
}

.portfolio-filter {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    background-color: var(--color-bg);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

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

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

.portfolio-item {
    background-color: var(--color-bg);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

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

.portfolio-img {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/10;
}

.portfolio-img-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-bg-tertiary), var(--color-bg-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 60px;
    color: var(--color-primary);
}

.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(var(--color-primary-rgb), 0.9), rgba(var(--color-primary-rgb), 0.7));
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.portfolio-actions {
    display: flex;
    gap: var(--spacing-md);
}

.portfolio-action {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-white);
    border-radius: 50%;
    color: var(--color-primary);
    font-size: var(--font-size-lg);
    transform: translateY(20px);
    opacity: 0;
    transition: all var(--transition-base);
}

.portfolio-item:hover .portfolio-action {
    transform: translateY(0);
    opacity: 1;
}

.portfolio-item:hover .portfolio-action:nth-child(1) {
    transition-delay: 0.1s;
}

.portfolio-item:hover .portfolio-action:nth-child(2) {
    transition-delay: 0.2s;
}

.portfolio-item:hover .portfolio-action:nth-child(3) {
    transition-delay: 0.3s;
}

.portfolio-action:hover {
    background-color: var(--color-text);
    color: var(--color-white);
}

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

.portfolio-category {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
}

.portfolio-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.portfolio-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-md);
}

.portfolio-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tech-tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-primary);
    background-color: rgba(var(--color-primary-rgb), 0.1);
    border-radius: var(--radius-sm);
}

.portfolio-cta {
    text-align: center;
    margin-top: var(--spacing-2xl);
}

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

/* Portfolio Responsive */
@media (max-width: 992px) {
    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   TESTIMONIALS SECTION
============================================ */
.testimonials-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.testimonials-slider {
    display: flex;
    overflow: hidden;
    position: relative;
}

.testimonial-card {
    min-width: 100%;
    padding: var(--spacing-2xl);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-2xl);
    text-align: center;
    transition: transform var(--transition-base);
}

.testimonial-rating {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.testimonial-rating i {
    color: #FFC107;
    font-size: var(--font-size-lg);
}

.testimonial-quote {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    font-style: italic;
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.testimonial-quote::before {
    content: '"';
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 80px;
    color: var(--color-primary);
    opacity: 0.2;
    font-family: Georgia, serif;
    line-height: 1;
}

.testimonial-author {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.author-avatar {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-size: var(--font-size-xl);
}

.author-info {
    text-align: left;
}

.author-name {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
}

.author-role {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.testimonials-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.nav-btn {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-secondary);
    border-radius: 50%;
    color: var(--color-text);
    font-size: var(--font-size-lg);
    transition: all var(--transition-fast);
}

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

.testimonials-dots {
    display: flex;
    gap: var(--spacing-sm);
}

.dot {
    width: 12px;
    height: 12px;
    background-color: var(--color-border);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.dot.active {
    background-color: var(--color-primary);
    transform: scale(1.2);
}

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

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-3xl);
}

.contact-info-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.contact-info-text {
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-xl);
}

.contact-cards {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.contact-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.contact-card:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-md);
}

.contact-card-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--radius-md);
    color: var(--color-white);
    font-size: var(--font-size-lg);
}

.contact-card-content h4 {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.contact-card-content a,
.contact-card-content p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

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

.contact-social h4 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
    transition: all var(--transition-fast);
}

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

/* Contact Form */
.contact-form-wrapper {
    background-color: var(--color-bg);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-group.full-width {
    grid-column: span 2;
}

.form-label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
}

.input-wrapper {
    position: relative;
}

.input-wrapper i {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.textarea-wrapper i {
    top: var(--spacing-md);
    transform: none;
}

.form-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) var(--spacing-3xl);
    font-size: var(--font-size-sm);
    color: var(--color-text);
    background-color: var(--color-bg-secondary);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

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

.form-input::placeholder {
    color: var(--color-text-muted);
}

.form-textarea {
    resize: vertical;
    min-height: 150px;
}

.form-select {
    cursor: pointer;
    appearance: none;
}

.error-message {
    font-size: var(--font-size-xs);
    color: var(--color-error);
    min-height: 18px;
}

.btn-submit {
    width: 100%;
    padding: var(--spacing-lg);
}

.btn-loader {
    display: none;
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.btn-submit.loading .btn-loader {
    display: block;
}

.btn-submit.loading span:not(.btn-loader),
.btn-submit.loading i {
    display: none;
}

/* Form Success */
.form-success {
    display: none;
    text-align: center;
    padding: var(--spacing-3xl);
}

.form-success.show {
    display: block;
}

.form-success + .contact-form {
    display: none;
}

.success-icon {
    font-size: 80px;
    color: var(--color-success);
    margin-bottom: var(--spacing-lg);
}

.form-success h3 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.form-success p {
    color: var(--color-text-secondary);
}

/* Contact Responsive */
@media (max-width: 992px) {
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .contact-form {
        grid-template-columns: 1fr;
    }

    .form-group.full-width {
        grid-column: span 1;
    }

    .contact-form-wrapper {
        padding: var(--spacing-lg);
    }
}

/* ============================================
   FOOTER
============================================ */
.footer {
    background-color: var(--color-text);
    color: var(--color-white);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

[data-theme="dark"] .footer {
    background-color: #0A0A12;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    font-family: var(--font-mono);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
    display: inline-flex;
    margin-bottom: var(--spacing-md);
}

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

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-lg);
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--color-white);
    transition: all var(--transition-fast);
}

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

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

.footer-column h4 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-lg);
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

.footer-column a:hover {
    color: var(--color-primary);
    padding-left: 5px;
}

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

.footer-contact i {
    color: var(--color-primary);
    font-size: var(--font-size-sm);
}

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

.footer-bottom p {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.5);
}

.footer-bottom i {
    color: var(--color-error);
}

/* Footer Responsive */
@media (max-width: 992px) {
    .footer-content {
        grid-template-columns: 1fr;
    }

    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .footer-links {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* ============================================
   BACK TO TOP BUTTON
============================================ */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-radius: var(--radius-full);
    color: var(--color-white);
    font-size: var(--font-size-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: var(--z-fixed);
}

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

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

/* ============================================
   ANIMATIONS
============================================ */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger animations */
.animate-on-scroll:nth-child(1) { transition-delay: 0.1s; }
.animate-on-scroll:nth-child(2) { transition-delay: 0.2s; }
.animate-on-scroll:nth-child(3) { transition-delay: 0.3s; }
.animate-on-scroll:nth-child(4) { transition-delay: 0.4s; }
.animate-on-scroll:nth-child(5) { transition-delay: 0.5s; }
.animate-on-scroll:nth-child(6) { transition-delay: 0.6s; }

/* ============================================
   MOBILE OVERLAY
============================================ */
.mobile-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: calc(var(--z-modal) - 1);
}

.mobile-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ============================================
   SELECTION STYLES
============================================ */
::selection {
    background-color: var(--color-primary);
    color: var(--color-white);
}

/* ============================================
   SCROLLBAR STYLES
============================================ */
::-webkit-scrollbar {
    width: 10px;
}

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-dark);
}