/* ===================================
   DESIGN SYSTEM & CSS VARIABLES
   =================================== */
:root {
    /* Color Palette */
    --color-bg-primary: #0a0e27;
    --color-bg-secondary: #151932;
    --color-bg-tertiary: #1e2340;

    --color-accent-primary: #6366f1;
    --color-accent-secondary: #8b5cf6;
    --color-accent-tertiary: #ec4899;

    --color-text-primary: #f8fafc;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #94a3b8;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
    --gradient-secondary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --gradient-mesh: radial-gradient(at 40% 20%, hsla(250, 70%, 60%, 0.3) 0px, transparent 50%),
        radial-gradient(at 80% 0%, hsla(280, 70%, 60%, 0.3) 0px, transparent 50%),
        radial-gradient(at 0% 50%, hsla(330, 70%, 60%, 0.2) 0px, transparent 50%);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --spacing-2xl: 8rem;

    /* Typography */
    --font-size-xs: 0.875rem;
    --font-size-sm: 1rem;
    --font-size-md: 1.125rem;
    --font-size-lg: 1.5rem;
    --font-size-xl: 2rem;
    --font-size-2xl: 3rem;
    --font-size-3xl: 4rem;
    --font-size-4xl: 5rem;

    /* Effects */
    --blur-sm: 8px;
    --blur-md: 16px;
    --blur-lg: 24px;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    --header-height: 40px;
    /* height of fixed header for scroll offset */
}

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

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    overflow-x: hidden;
    position: relative;
}

/* Animated mesh gradient background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-mesh);
    z-index: -1;
    animation: meshMove 20s ease-in-out infinite;
}

@keyframes meshMove {

    0%,
    100% {
        opacity: 0.5;
        transform: scale(1);
    }

    50% {
        opacity: 0.8;
        transform: scale(1.1);
    }
}

/* ===================================
   SCROLL PROGRESS INDICATOR
   =================================== */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 4px;
    background: var(--gradient-primary);
    z-index: 10000;
    transform-origin: left;
    animation: progressGlow 2s ease-in-out infinite;
}

@keyframes progressGlow {

    0%,
    100% {
        box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
    }

    50% {
        box-shadow: 0 0 20px rgba(99, 102, 241, 0.8);
    }
}

/* ===================================
   HEADER & NAVIGATION
   =================================== */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 2000;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(10, 14, 39, 0.2);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transform: translateY(0);
    animation: slideDown 0.8s cubic-bezier(0.16, 1, 0.3, 1) backwards;
    transition: transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.header-hidden {
    transform: translateY(-100%);
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
    }

    to {
        transform: translateY(0);
    }
}

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

.logo {
    font-size: var(--font-size-lg);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: var(--transition-base);
}

.logo a {
    text-decoration: none;
    color: inherit;
    background: inherit;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo:hover {
    transform: scale(1.05);
    filter: brightness(1.2);
}

nav ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-md);
}

nav ul li a {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: var(--font-size-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 8px;
    transition: var(--transition-base);
    position: relative;
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-base);
    transform: translateX(-50%);
}

nav ul li a:hover {
    color: var(--color-text-primary);
}

nav ul li a:hover::after {
    width: 80%;
}

/* ===================================
   MAIN CONTAINER
   =================================== */
main {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-md);
    padding-top: calc(var(--spacing-2xl) + 80px);
}

section {
    margin-bottom: 5rem;
    opacity: 0;
    transition: opacity 0.8s ease;
}

section.visible {
    opacity: 1;
}

/* ===================================
   INTRO SECTION
   =================================== */
#intro {
    min-height: calc(100vh - 160px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
}

#intro h1 {
    font-size: clamp(2.5rem, 8vw, var(--font-size-4xl));
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    display: inline-block;
    animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {

    0%,
    100% {
        filter: hue-rotate(0deg);
    }

    50% {
        filter: hue-rotate(20deg);
    }
}

.tagline {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    font-weight: 400;
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
}

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

.cta-primary,
.cta-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 1rem 2.5rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: var(--font-size-md);
    text-decoration: none;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.cta-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md), 0 0 20px rgba(99, 102, 241, 0.3);
}

.cta-primary:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(99, 102, 241, 0.5);
}

.cta-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 2px solid rgba(99, 102, 241, 0.5);
}

.cta-secondary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition-base);
    z-index: -1;
}

.cta-secondary:hover::before {
    opacity: 1;
}

.cta-secondary:hover {
    border-color: transparent;
    transform: translateY(-4px);
}

#intro p {
    font-size: var(--font-size-md);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.profile-image {
    margin-top: var(--spacing-lg);
    position: relative;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-20px);
    }
}

.profile-image::before {
    content: '';
    position: absolute;
    top: -20px;
    left: -20px;
    right: -20px;
    bottom: -20px;
    background: var(--gradient-primary);
    border-radius: 50%;
    opacity: 0.3;
    filter: blur(40px);
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 0.3;
        transform: scale(1);
    }

    50% {
        opacity: 0.5;
        transform: scale(1.05);
    }
}

.profile-image img {
    width: 400px;
    height: 400px;
    border-radius: 50%;
    object-fit: cover;
    object-position: center;
    border: 4px solid rgba(99, 102, 241, 0.3);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    position: relative;
    z-index: 1;
    transition: var(--transition-slow);
}

.profile-image img:hover {
    transform: scale(1.05);
    border-color: rgba(99, 102, 241, 0.6);
}

/* ===================================
   ABOUT SECTION
   =================================== */
#about {
    text-align: center;
}

#about h2 {
    font-size: clamp(2rem, 5vw, var(--font-size-3xl));
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

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

.about-text strong {
    color: var(--color-text-primary);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.stat-card {
    background: rgba(30, 35, 64, 0.5);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: var(--spacing-md);
    transition: var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: var(--shadow-md), 0 0 20px rgba(99, 102, 241, 0.2);
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

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

/* ===================================
   SKILLS SECTION
   =================================== */
#skills h2 {
    font-size: clamp(2rem, 5vw, var(--font-size-3xl));
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    text-align: center;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-md);
}

.skill-category {
    background: rgba(30, 35, 64, 0.5);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: var(--spacing-md);
    transition: var(--transition-base);
    text-align: center;
}

.skill-category:hover {
    transform: translateY(-8px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(99, 102, 241, 0.2);
}

.skill-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    filter: grayscale(0.3);
    transition: var(--transition-base);
}

.skill-category:hover .skill-icon {
    filter: grayscale(0);
    transform: scale(1.1);
}

.skill-category h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.skill-tags {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.skill-tags li {
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    color: var(--color-text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: var(--font-size-sm);
    transition: var(--transition-base);
    cursor: default;
}

.skill-tags li:hover {
    background: rgba(99, 102, 241, 0.2);
    border-color: rgba(99, 102, 241, 0.4);
    color: var(--color-text-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.1);
}

.skill-bar {
    display: block;
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    margin-top: var(--spacing-xs);
    overflow: hidden;
}

.skill-fill {
    display: block;
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 10px;
    transition: width 1s ease;
    animation: skillGlow 2s ease-in-out infinite;
}

@keyframes skillGlow {

    0%,
    100% {
        box-shadow: 0 0 5px rgba(99, 102, 241, 0.5);
    }

    50% {
        box-shadow: 0 0 10px rgba(99, 102, 241, 0.8);
    }
}

/* ===================================
   GITHUB SECTION
   =================================== */
#github {
    text-align: center;
}

#github h2 {
    font-size: clamp(2rem, 5vw, var(--font-size-3xl));
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.github-container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-md);
    background: rgba(30, 35, 64, 0.3);
    backdrop-filter: blur(var(--blur-sm));
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.github-chart {
    width: 100%;
    max-width: 800px;
    border-radius: 8px;
    margin-bottom: var(--spacing-sm);
}

.github-link {
    margin-top: var(--spacing-xs);
}

.github-link a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-md);
    transition: var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.github-link a:hover {
    color: var(--color-text-primary);
    transform: translateY(-2px);
}

.github-link i {
    font-size: 1.5rem;
}

/* ===================================
   PROJECTS SECTION
   =================================== */
#projects h2 {
    font-size: clamp(2rem, 5vw, var(--font-size-3xl));
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    text-align: center;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.project {
    background: rgba(30, 35, 64, 0.5);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: var(--spacing-md);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.project::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition-base);
}

.project:hover::before {
    transform: scaleX(1);
}

.project:hover {
    transform: translateY(-8px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(99, 102, 241, 0.2);
}

.project h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

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

.view-project {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--gradient-primary);
    color: white;
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: var(--font-size-sm);
    transition: var(--transition-base);
    border: none;
    cursor: pointer;
    font-family: inherit;
    box-shadow: var(--shadow-md);
}

.view-project:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(99, 102, 241, 0.4);
}

.view-project:active {
    transform: translateY(0);
}

/* ===================================
   CONTACT SECTION
   =================================== */
#contact {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

#contact h2 {
    font-size: clamp(2rem, 5vw, var(--font-size-3xl));
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.contact-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: rgba(99, 102, 241, 0.1);
    backdrop-filter: blur(var(--blur-sm));
    border: 2px solid rgba(99, 102, 241, 0.3);
    color: var(--color-text-primary);
    text-decoration: none;
    padding: 1rem 2rem;
    border-radius: 16px;
    font-weight: 600;
    font-size: var(--font-size-sm);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.contact-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition-base);
    z-index: -1;
}

.contact-button:hover::before {
    opacity: 1;
}

.contact-button:hover {
    border-color: transparent;
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(99, 102, 241, 0.3);
}

.contact-button i {
    font-size: 1.2rem;
}

/* ===================================
   FOOTER
   =================================== */
footer {
    text-align: center;
    padding: var(--spacing-md);
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
        --spacing-2xl: 5rem;
    }

    header {
        padding: var(--spacing-sm);
    }

    nav {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    nav ul {
        gap: var(--spacing-sm);
    }

    main {
        padding: var(--spacing-lg) var(--spacing-sm);
        padding-top: calc(var(--spacing-lg) + 120px);
    }

    .profile-image img {
        width: 280px;
        height: 280px;
    }

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

    .contact-buttons {
        flex-direction: column;
        align-items: stretch;
    }

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

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

@media (max-width: 480px) {
    .profile-image img {
        width: 220px;
        height: 220px;
    }

    nav ul {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-xs);
    }
}

/* ===================================
   UTILITY CLASSES
   =================================== */
.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glass {
    background: rgba(30, 35, 64, 0.5);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid rgba(255, 255, 255, 0.1);
}