/* ========================================
   CSS Variables & Theme Configuration
   Red & Black Professional Theme
======================================== */
:root {
    /* Colors - Red & Black Theme */
    --primary-color: #b30000;
    --primary-hover: #ff0000;
    --secondary-color: #cc0000;
    --accent-color: #ff3333;
    --glow-color: rgba(255, 0, 0, 0.5);
    
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #252525;
    --bg-card: rgba(26, 26, 26, 0.8);
    
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #999999;
    
    --border-color: #333333;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
    --neon-shadow: 0 0 20px rgba(255, 0, 0, 0.3);
    
    /* Typography */
    --font-family: 'Poppins', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 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: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Navbar height */
    --navbar-height: 70px;
}

/* Light Mode (Optional) */
[data-theme="light"] {
    --primary-color: #b30000;
    --primary-hover: #cc0000;
    --secondary-color: #cc0000;
    --accent-color: #ff3333;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e0e0e0;
    --bg-card: rgba(255, 255, 255, 0.9);
    
    --text-primary: #1a1a1a;
    --text-secondary: #333333;
    --text-muted: #666666;
    
    --border-color: #e0e0e0;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);
    --neon-shadow: 0 0 20px rgba(179, 0, 0, 0.2);
}

/* ========================================
   Loading Animation
======================================== */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

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

.loading-content {
    text-align: center;
}

.loading-logo {
    font-size: 4rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 2rem;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

.loading-bar {
    width: 200px;
    height: 4px;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.loading-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    animation: loading 2s ease-in-out infinite;
}

@keyframes loading {
    0% {
        width: 0;
        left: 0;
    }
    50% {
        width: 100%;
        left: 0;
    }
    100% {
        width: 0;
        left: 100%;
    }
}

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

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

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

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

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

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

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

/* ========================================
   Navigation
======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background-color: rgba(15, 15, 15, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    transition: all var(--transition-base);
    border-bottom: 1px solid var(--border-color);
}

[data-theme="light"] .navbar {
    background-color: rgba(255, 255, 255, 0.9);
}

.navbar.scrolled {
    border-bottom-color: var(--primary-color);
    box-shadow: 0 2px 20px var(--neon-shadow);
}

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

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 10px;
    z-index: 1001;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    transition: all var(--transition-fast);
    border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    font-size: var(--font-size-xl);
    color: var(--text-primary);
}

.logo-text {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: var(--radius-md);
    font-size: var(--font-size-lg);
}

.logo-full {
    display: none;
}

@media (min-width: 768px) {
    .logo-full {
        display: inline;
    }
}

.nav-menu {
    display: none;
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    background-color: var(--bg-primary);
    flex-direction: column;
    padding: var(--spacing-md);
    gap: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.nav-menu.active {
    display: flex;
}

.nav-link {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--text-secondary);
    padding: var(--spacing-xs) 0;
    position: relative;
    transition: color var(--transition-fast);
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: width var(--transition-fast);
}

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

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

.nav-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    position: relative;
    transition: background-color var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: all var(--transition-fast);
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    bottom: -7px;
}

.nav-toggle.active .hamburger {
    background-color: transparent;
}

.nav-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle.active .hamburger::after {
    bottom: 0;
    transform: rotate(-45deg);
}

@media (min-width: 1024px) {
    .nav-menu {
        display: flex;
        position: static;
        flex-direction: row;
        padding: 0;
        background: transparent;
        border: none;
        gap: var(--spacing-lg);
    }
    
    .nav-toggle {
        display: none;
    }
}

/* ========================================
   Hero Section
======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: var(--navbar-height);
    overflow: hidden;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(179, 0, 0, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 50%, rgba(204, 0, 0, 0.1) 0%, transparent 50%);
    animation: gradientMove 10s ease-in-out infinite;
}

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

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

.hero-text {
    order: 2;
    text-align: center;
}

.hero-greeting {
    font-size: var(--font-size-lg);
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
    animation: fadeInUp 0.6s ease;
}

.hero-name {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
    animation: fadeInUp 0.6s ease 0.1s both;
}

.hero-role {
    font-size: var(--font-size-xl);
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    min-height: 2rem;
    animation: fadeInUp 0.6s ease 0.2s both;
}

.typing-text {
    display: inline;
}

.cursor {
    display: inline-block;
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.hero-description {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.6s ease 0.3s both;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.6s ease 0.4s both;
}

.hero-social {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    animation: fadeInUp 0.6s ease 0.5s both;
}

.hero-social .social-link {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    transition: all var(--transition-fast);
}

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

.hero-image {
    order: 1;
    display: flex;
    justify-content: center;
    animation: fadeInUp 0.6s ease 0.2s both;
}

.image-wrapper {
    position: relative;
    perspective: 1000px;
}

.image-3d-container {
    width: 250px;
    height: 250px;
    border-radius: var(--radius-xl);
    position: relative;
    z-index: 2;
    transform-style: preserve-3d;
    transition: transform 0.5s ease;
    box-shadow: var(--shadow-lg);
}

.profile-image-3d {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-xl);
    transition: transform 0.5s ease;
}

.image-3d-container:hover {
    transform: rotateY(10deg) rotateX(5deg);
}

.image-3d-container:hover .profile-image-3d {
    transform: scale(1.05);
}

.image-placeholder {
    width: 250px;
    height: 250px;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 100px;
    color: white;
    position: relative;
    z-index: 2;
    box-shadow: var(--shadow-lg);
}

.image-bg {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 250px;
    height: 250px;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    z-index: 1;
    opacity: 0.3;
}

.hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

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

.scroll-indicator i {
    font-size: var(--font-size-lg);
}

.hero-shapes {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: var(--radius-full);
    opacity: 0.1;
    animation: float 6s ease-in-out infinite;
}

.shape-1 {
    width: 300px;
    height: 300px;
    background: var(--primary-color);
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.shape-2 {
    width: 200px;
    height: 200px;
    background: var(--secondary-color);
    bottom: 20%;
    left: -50px;
    animation-delay: 2s;
}

.shape-3 {
    width: 150px;
    height: 150px;
    background: var(--accent-color);
    top: 40%;
    right: 10%;
    animation-delay: 4s;
}

@media (min-width: 768px) {
    .hero-name {
        font-size: var(--font-size-4xl);
    }
    
    .hero-role {
        font-size: var(--font-size-2xl);
    }
    
    .hero-description {
        font-size: var(--font-size-lg);
    }
    
    .image-3d-container,
    .image-placeholder,
    .image-bg {
        width: 300px;
        height: 300px;
    }
}

@media (min-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .hero-text {
        order: 1;
        text-align: left;
    }
    
    .hero-image {
        order: 2;
    }
    
    .hero-name {
        font-size: var(--font-size-5xl);
    }
    
    .hero-description {
        margin-left: 0;
        margin-right: 0;
    }
    
    .hero-buttons {
        justify-content: flex-start;
    }
    
    .hero-social {
        justify-content: flex-start;
    }
    
    .image-3d-container,
    .image-placeholder,
    .image-bg {
        width: 350px;
        height: 350px;
    }
}

/* ========================================
   Buttons
======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: 0 4px 15px var(--glow-color);
    border: 2px solid var(--primary-color);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px var(--primary-color), 0 0 60px var(--glow-color);
    background: linear-gradient(135deg, var(--primary-hover), var(--secondary-color));
}

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

.btn-secondary:hover {
    border-color: var(--primary-hover);
    color: var(--primary-hover);
    box-shadow: 0 0 20px var(--glow-color);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: var(--font-size-sm);
}

.project-buttons {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.project-buttons .btn {
    flex: 1;
    justify-content: center;
}

/* ========================================
   Section Styles
======================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

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

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

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

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

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

.about-image {
    display: flex;
    justify-content: center;
}

.about-image-wrapper {
    position: relative;
    perspective: 1000px;
}

.about-3d-container {
    width: 280px;
    height: 280px;
    border-radius: var(--radius-xl);
    position: relative;
    z-index: 2;
    transform-style: preserve-3d;
    transition: transform 0.5s ease;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.about-image-3d {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-xl);
    transition: transform 0.5s ease;
}

.about-3d-container:hover {
    transform: rotateY(10deg) rotateX(5deg);
}

.about-3d-container:hover .about-image-3d {
    transform: scale(1.05);
}

.about-placeholder {
    width: 280px;
    height: 280px;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, var(--bg-tertiary), var(--border-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 100px;
    color: var(--primary-color);
    position: relative;
    z-index: 2;
}

.about-text h3 {
    font-size: var(--font-size-2xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

.about-info {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
}

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

.info-label {
    font-weight: 600;
    color: var(--text-primary);
    min-width: 100px;
}

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

.info-value.available {
    color: #10b981;
    font-weight: 600;
}

@media (min-width: 768px) {
    .about-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .about-3d-container,
    .about-placeholder {
        width: 350px;
        height: 350px;
    }
    
    .about-info {
        grid-template-columns: 1fr 1fr;
    }
}

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

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

.skill-card {
    background-color: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: 0 2px 10px var(--shadow-color);
    transition: all var(--transition-fast);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--card-color, var(--primary-color)), var(--card-accent, var(--secondary-color)));
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0 30px var(--card-glow, var(--neon-shadow));
    border-color: var(--card-color, var(--primary-color));
    background-color: rgba(26, 26, 26, 0.95);
}

.skill-card:hover::before {
    opacity: 1;
}

/* Skill Card Color Variations */
.skill-card[data-skill="HTML"] {
    --card-color: #e34c26;
    --card-accent: #f06529;
    --card-glow: rgba(227, 76, 38, 0.3);
}

.skill-card[data-skill="CSS"] {
    --card-color: #264de4;
    --card-accent: #2965f1;
    --card-glow: rgba(38, 77, 228, 0.3);
}

.skill-card[data-skill="JavaScript"] {
    --card-color: #f7df1e;
    --card-accent: #f0db4f;
    --card-glow: rgba(247, 223, 30, 0.3);
}

.skill-card[data-skill="PHP"] {
    --card-color: #777bb4;
    --card-accent: #8892bf;
    --card-glow: rgba(119, 123, 180, 0.3);
}

.skill-card[data-skill="MySQL"] {
    --card-color: #4479a1;
    --card-accent: #5c8dbc;
    --card-glow: rgba(68, 121, 161, 0.3);
}

.skill-card[data-skill="Database Management"] {
    --card-color: #4caf50;
    --card-accent: #66bb6a;
    --card-glow: rgba(76, 175, 80, 0.3);
}

.skill-card[data-skill="UI/UX Design"] {
    --card-color: #ff6b6b;
    --card-accent: #ff8787;
    --card-glow: rgba(255, 107, 107, 0.3);
}

.skill-card[data-skill="Troubleshooting"] {
    --card-color: #9c27b0;
    --card-accent: #ba68c8;
    --card-glow: rgba(156, 39, 176, 0.3);
}

.skill-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    color: white;
    margin-bottom: var(--spacing-sm);
}

.skill-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.skill-progress {
    height: 8px;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

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

.skill-percent {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--primary-color);
}

.skills-other h3 {
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    justify-content: center;
}

.skill-tag {
    padding: 0.5rem 1rem;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
}

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

@media (min-width: 768px) {
    .skills-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1024px) {
    .skills-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ========================================
   Experience Section
======================================== */
.experience {
    background-color: var(--bg-secondary);
}

.experience-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.experience-timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
}

.timeline-item {
    position: relative;
    padding-left: 60px;
    padding-bottom: var(--spacing-xl);
}

.timeline-marker {
    position: absolute;
    left: 11px;
    top: 0;
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: 3px solid var(--bg-secondary);
    box-shadow: 0 0 0 3px var(--primary-color);
}

.timeline-content {
    background-color: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 10px var(--shadow-color);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.timeline-content:hover {
    box-shadow: var(--neon-shadow);
    border-color: var(--primary-color);
}

.timeline-header {
    margin-bottom: var(--spacing-md);
}

.timeline-header h3 {
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.timeline-company {
    display: block;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.timeline-date {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.timeline-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.timeline-achievements h4 {
    font-size: var(--font-size-base);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.timeline-achievements ul {
    list-style: none;
}

.timeline-achievements li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.timeline-achievements li i {
    color: var(--primary-color);
    margin-top: 4px;
}

@media (min-width: 768px) {
    .experience-timeline::before {
        left: 50%;
        transform: translateX(-50%);
    }
    
    .timeline-item {
        padding-left: 0;
        width: 50%;
    }
    
    .timeline-item:nth-child(odd) {
        padding-right: 40px;
        margin-left: 0;
    }
    
    .timeline-item:nth-child(even) {
        padding-left: 40px;
        margin-left: 50%;
    }
    
    .timeline-marker {
        left: auto;
        right: -10px;
    }
    
    .timeline-item:nth-child(even) .timeline-marker {
        right: auto;
        left: -10px;
    }
}

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

.projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.project-card {
    background-color: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 2px 10px var(--shadow-color);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
    position: relative;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--card-color, var(--primary-color)), var(--card-accent, var(--secondary-color)));
    opacity: 0;
    transition: opacity var(--transition-fast);
    z-index: 10;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 0 30px var(--card-glow, var(--neon-shadow));
    border-color: var(--card-color, var(--primary-color));
}

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

/* Project Card Color Variations */
.project-card:nth-child(1) {
    --card-color: #e34c26;
    --card-accent: #f06529;
    --card-glow: rgba(227, 76, 38, 0.3);
}

.project-card:nth-child(2) {
    --card-color: #264de4;
    --card-accent: #2965f1;
    --card-glow: rgba(38, 77, 228, 0.3);
}

.project-card:nth-child(3) {
    --card-color: #9c27b0;
    --card-accent: #ba68c8;
    --card-glow: rgba(156, 39, 176, 0.3);
}

.project-image {
    position: relative;
    overflow: hidden;
}

.project-placeholder {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 60px;
    color: white;
    transition: transform var(--transition-base);
}

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

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(37, 99, 235, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

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

.project-link {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background-color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: var(--font-size-lg);
    transform: scale(0);
    transition: transform var(--transition-fast);
}

.project-card:hover .project-link {
    transform: scale(1);
}

.project-info {
    padding: var(--spacing-md);
}

.project-category {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-xs);
}

.project-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.project-description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--spacing-md);
}

.tech-tag {
    padding: 0.25rem 0.75rem;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.project-features {
    list-style: none;
}

.project-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

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

@media (min-width: 768px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ========================================
   Certifications Section
======================================== */
.certifications {
    background-color: var(--bg-secondary);
}

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

.cert-card {
    background-color: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: 0 2px 10px var(--shadow-color);
    transition: all var(--transition-fast);
    border: 1px solid var(--border-color);
    text-align: center;
}

.cert-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--neon-shadow);
    border-color: var(--primary-color);
    background-color: rgba(26, 26, 26, 0.95);
}

.cert-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    color: white;
    margin: 0 auto var(--spacing-sm);
}

.cert-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
}

.cert-issuer {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.cert-year {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

@media (min-width: 768px) {
    .certifications-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

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

.edu-item {
    display: flex;
    gap: var(--spacing-md);
    background-color: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 10px var(--shadow-color);
    border: 1px solid var(--border-color);
    max-width: 800px;
    margin: 0 auto;
}

.edu-icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    color: white;
}

.edu-content h3 {
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.edu-school {
    display: block;
    font-size: var(--font-size-lg);
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.edu-location {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
}

.edu-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.edu-courses {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.course-tag {
    padding: 0.5rem 1rem;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

@media (max-width: 768px) {
    .edu-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .edu-courses {
        justify-content: center;
    }
}

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

.contact-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info h3 {
    font-size: var(--font-size-2xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.contact-info > p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.contact-details {
    margin-bottom: var(--spacing-lg);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

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

.contact-text {
    display: flex;
    flex-direction: column;
}

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

.contact-value {
    font-weight: 600;
    color: var(--text-primary);
}

.contact-social h4 {
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

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

.social-links .social-link {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    transition: all var(--transition-fast);
}

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

.contact-form-wrapper {
    background-color: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 10px var(--shadow-color);
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--font-size-base);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color var(--transition-fast);
}

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

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

@media (min-width: 768px) {
    .contact-content {
        grid-template-columns: 1fr 1fr;
    }
}

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

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
}

.footer-tagline {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    text-align: center;
}

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

.footer-links a {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

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

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

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.footer-credit {
    margin-top: var(--spacing-xs);
}

.footer-credit i {
    color: #ef4444;
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    font-size: var(--font-size-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

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

/* Extra Small Devices (phones, 576px and down) */
@media (max-width: 575.98px) {
    .container {
        padding: 0 1rem;
    }
    
    /* Hero Section */
    .hero-content {
        gap: var(--spacing-lg);
    }
    
    .hero-name {
        font-size: var(--font-size-3xl);
    }
    
    .hero-role {
        font-size: var(--font-size-xl);
    }
    
    .hero-description {
        font-size: var(--font-size-base);
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }
    
    .hero-social {
        justify-content: center;
    }
    
    .image-3d-container,
    .about-3d-container {
        width: 200px;
        height: 200px;
    }
    
    /* Navigation */
    .nav-menu {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        background-color: var(--bg-primary);
        flex-direction: row;
        align-items: center;
        justify-content: flex-start;
        gap: var(--spacing-md);
        padding: var(--spacing-md) var(--spacing-lg);
        transform: translateY(-100%);
        transition: transform var(--transition-base);
        z-index: 999;
        overflow-x: auto;
        white-space: nowrap;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-menu.active {
        transform: translateY(0);
    }
    
    .nav-link {
        font-size: var(--font-size-sm);
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    /* About Section */
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-text {
        order: 2;
    }
    
    .about-image {
        order: 1;
    }
    
    .about-3d-container {
        margin: 0 auto;
    }
    
    .about-info {
        grid-template-columns: 1fr;
    }
    
    /* Skills Section */
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    /* Experience Section */
    .experience-timeline {
        padding-left: var(--spacing-md);
    }
    
    .timeline-item {
        padding-left: var(--spacing-lg);
    }
    
    /* Projects Section */
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-buttons {
        flex-direction: column;
    }
    
    .project-buttons .btn {
        width: 100%;
    }
    
    /* Certifications Section */
    .certifications-grid {
        grid-template-columns: 1fr;
    }
    
    /* Education Section */
    .education-timeline {
        padding-left: var(--spacing-md);
    }
    
    .edu-item {
        padding-left: var(--spacing-lg);
    }
    
    /* Contact Section */
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    /* Footer */
    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    /* Section Headers */
    .section-title {
        font-size: var(--font-size-2xl);
    }
}

/* Small Devices (landscape phones, 576px and up) */
@media (min-width: 576px) and (max-width: 767.98px) {
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .certifications-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Medium Devices (tablets, 768px and up) */
@media (min-width: 768px) and (max-width: 991.98px) {
    .hero-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .hero-text {
        order: 1;
        text-align: left;
    }
    
    .hero-image {
        order: 2;
    }
    
    .hero-buttons {
        justify-content: flex-start;
    }
    
    .hero-social {
        justify-content: flex-start;
    }
    
    .about-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .certifications-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .contact-content {
        grid-template-columns: 1fr 1fr;
    }
}

/* Large Devices (desktops, 992px and up) */
@media (min-width: 992px) and (max-width: 1199.98px) {
    .skills-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Extra Large Devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
    .skills-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .certifications-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Hide hamburger menu on desktop */
@media (min-width: 768px) {
    .hamburger {
        display: none;
    }
    
    .nav-menu {
        position: static;
        flex-direction: row;
        transform: none;
        background-color: transparent;
        gap: var(--spacing-md);
    }
}

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

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

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

/* Scroll Reveal Animation */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   Responsive Adjustments
======================================== */
@media (max-width: 768px) {
    :root {
        --spacing-2xl: 3rem;
        --spacing-xl: 2rem;
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
}