/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Material You Color Palette */
    --primary: #6750A4;
    --on-primary: #FFFFFF;
    --primary-container: #EADDFF;
    --on-primary-container: #21005D;
    --secondary: #625B71;
    --on-secondary: #FFFFFF;
    --secondary-container: #E8DEF8;
    --on-secondary-container: #1D192B;
    --tertiary: #7D5260;
    --on-tertiary: #FFFFFF;
    --tertiary-container: #FFD8E4;
    --on-tertiary-container: #31111D;
    --error: #BA1A1A;
    --on-error: #FFFFFF;
    --error-container: #FFDAD6;
    --on-error-container: #410002;
    --background: #FFFBFE;
    --on-background: #1C1B1F;
    --surface: #FFFBFE;
    --on-surface: #1C1B1F;
    --surface-variant: #E7E0EC;
    --on-surface-variant: #49454F;
    --outline: #79747E;
    --outline-variant: #CAC4D0;
    --shadow: #000000;
    --scrim: #000000;
    --inverse-surface: #313033;
    --inverse-on-surface: #F4EFF4;
    --inverse-primary: #D0BCFF;
    --surface-dim: #DED8E1;
    --surface-bright: #FFFBFE;
    --surface-container-lowest: #FFFFFF;
    --surface-container-low: #F7F2FA;
    --surface-container: #F3EDF7;
    --surface-container-high: #ECE6F0;
    --surface-container-highest: #E6E0E9;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* 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;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

*::selection {
    background: var(--primary-container);
    color: var(--on-primary-container);
}

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

body {
    font-family: var(--font-family);
    background: var(--background);
    color: var(--on-background);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 251, 254, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--outline-variant);
    z-index: 1000;
    transition: var(--transition-normal);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) 0;
}

.nav-brand .brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

.nav-brand .brand:hover {
    color: var(--on-primary-container);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-2xl);
}

.nav-link {
    color: var(--on-surface);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition-fast);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--on-surface);
    transition: var(--transition-fast);
}

/* Main Content */
.main {
    margin-top: 80px;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-3xl) 0;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary), var(--tertiary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--on-surface-variant);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
    border: none;
    cursor: pointer;
    font-family: inherit;
}

.btn-primary {
    background: var(--primary);
    color: var(--on-primary);
    box-shadow: 0 4px 12px rgba(103, 80, 164, 0.3);
}

.btn-primary:hover {
    background: var(--on-primary-container);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(103, 80, 164, 0.4);
}

.btn-secondary {
    background: var(--surface-container);
    color: var(--on-surface);
    border: 2px solid var(--outline-variant);
}

.btn-secondary:hover {
    background: var(--surface-container-high);
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* Section Styles */
section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--on-surface);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--on-surface-variant);
    max-width: 600px;
    margin: 0 auto;
}

/* About Section */
.about {
    background: var(--surface-container-low);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text p {
    font-size: 1.125rem;
    color: var(--on-surface);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.skills-overview {
    margin-top: var(--spacing-2xl);
}

.skills-overview h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--on-surface);
}

.skills-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.skill-tag {
    background: var(--primary-container);
    color: var(--on-primary-container);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-xl);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-2xl);
}

.project-card {
    background: var(--surface);
    border: 1px solid var(--outline-variant);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border-color: var(--primary);
}

.project-image {
    height: 200px;
    background: var(--surface-container);
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--outline-variant);
}

.project-image i {
    font-size: 4rem;
    color: var(--primary);
}

.project-content {
    padding: var(--spacing-2xl);
}

.project-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--on-surface);
}

.project-description {
    color: var(--on-surface-variant);
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.tech-tag {
    background: var(--secondary-container);
    color: var(--on-secondary-container);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-size: 0.75rem;
    font-weight: 500;
}

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

.project-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
}

.project-link:hover {
    color: var(--on-primary-container);
}

/* Contact Section */
.contact {
    background: var(--surface-container-low);
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background: var(--surface);
    border: 1px solid var(--outline-variant);
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
}

.contact-item:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.contact-item i {
    font-size: 2rem;
    color: var(--primary);
}

.contact-item h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--on-surface);
}

.contact-item a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
}

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

/* Footer */
.footer {
    background: var(--surface-container);
    border-top: 1px solid var(--outline-variant);
    padding: var(--spacing-2xl) 0;
}

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

.footer-content p {
    color: var(--on-surface-variant);
}

.footer-links {
    display: flex;
    gap: var(--spacing-xl);
}

.footer-links a {
    color: var(--on-surface-variant);
    text-decoration: none;
    transition: var(--transition-fast);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--surface);
        flex-direction: column;
        padding: var(--spacing-2xl);
        border-top: 1px solid var(--outline-variant);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-normal);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }

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

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }

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

    .contact-info {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

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

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

    .project-content {
        padding: var(--spacing-xl);
    }

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