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

:root {
    /* Color Palette */
    --color-bg: #fafafa;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #666666;
    --color-text-muted: #999999;
    --color-border: #e5e5e5;
    --color-card-bg: #ffffff;
    --color-accent: #000000;
    --color-accent-hover: #000000;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.75rem;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Layout */
    --container-width: 1200px;
    --border-radius: 12px;
    --transition-speed: 0.3s;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* =============================================
   Navigation
   ============================================= */
.navbar {
    padding: var(--spacing-sm) 0;
    background-color: rgba(250, 250, 250, 0.8);
    backdrop-filter: blur(10px);
}

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

.nav-logo {
    font-size: var(--font-size-2xl);
    cursor: pointer;
    transition: transform var(--transition-speed) ease;
}

.nav-logo:hover {
    transform: scale(1.1) rotate(10deg);
}

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

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: color var(--transition-speed) ease;
    position: relative;
}

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

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

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

/* =============================================
   Hero Section
   ============================================= */
.hero {
    padding: var(--spacing-2xl) 0 var(--spacing-md) 0;
    min-height: 70vh;
    display: flex;
    align-items: center;
}

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

.hero-text {
    animation: fadeInUp 0.8s ease-out;
    text-align: right;
}

.hero-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.hero-description {
    font-size: var(--font-size-lg);
    line-height: 1.7;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin-bottom: var(--spacing-md);
}

.hero-availability {
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-muted);
    max-width: 600px;
    margin-bottom: var(--spacing-lg);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: all var(--transition-speed) ease;
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

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

.btn-secondary:hover {
    background-color: var(--color-bg);
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeInRight 0.8s ease-out;
}

.image-placeholder {
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: var(--border-radius);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    background-size: cover;
    background-position: center;
}

.image-placeholder:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.15);
}

/* =============================================
   About Me Section
   ============================================= */
.about {
    padding: 0 0 var(--spacing-3xl) 0;
    /* background-color: #ffffff; */
}

.about-content {
    animation: fadeInUp 0.8s ease-out;
}

.about-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
    text-align: center;
}

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

.about-text:last-child {
    margin-bottom: 0;
}

.inline-link {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-speed) ease;
}

.inline-link:hover {
    border-bottom-color: var(--color-accent);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    flex-wrap: wrap;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-speed) ease;
}

.social-link:hover {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(245, 158, 11, 0.3);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

/* =============================================
   Tech Stack Section
   ============================================= */
.tech-stack {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: all var(--transition-speed) ease;
    cursor: default;
}

.tech-item:hover {
    transform: translateY(-4px);
    border-color: var(--color-accent);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.tech-logo {
    width: 60px;
    height: 60px;
    display: block;
    object-fit: contain;
    color: var(--color-text-primary);
    transition: all var(--transition-speed) ease;
}

.tech-item:hover .tech-logo {
    transform: scale(1.1);
}

.tech-label {
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    text-align: center;
}

/* =============================================
   Projects Section
   ============================================= */
.projects {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    animation: fadeInUp 0.8s ease-out;
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

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

.projects-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* =============================================
   Project Cards
   ============================================= */
.project-title-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.project-logo {
    width: 60px;
    height: 60px;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    flex-shrink: 0;
    transition: all var(--transition-speed) ease;
}

.project-card:hover .project-logo {
    border-color: var(--color-accent);
    transform: scale(1.05);
}

.project-card {
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    transition: all var(--transition-speed) ease;
    animation: fadeInUp 0.8s ease-out;
    animation-fill-mode: both;
}

.project-card:nth-child(1) {
    animation-delay: 0.1s;
}

.project-card:nth-child(2) {
    animation-delay: 0.2s;
}

.project-card:nth-child(3) {
    animation-delay: 0.3s;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
    border-color: var(--color-accent);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.project-info {
    flex: 1;
}

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

.project-category {
    display: inline-block;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-weight: 500;
}

.project-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--color-accent);
    color: white;
    border-radius: 50%;
    text-decoration: none;
    transition: all var(--transition-speed) ease;
    flex-shrink: 0;
}

.project-link:hover {
    background-color: var(--color-accent-hover);
    transform: rotate(45deg) scale(1.1);
}

.project-description {
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

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

.project-meta strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

.project-note {
    font-size: var(--font-size-sm);
    line-height: 1.6;
    color: var(--color-text-muted);
    font-style: italic;
    margin-top: var(--spacing-md);
    margin-bottom: 0;
}

/* =============================================
   Contact Section
   ============================================= */
.contact {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg);
}

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

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

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

.footer-text {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
}

.footer-text:last-child {
    margin-bottom: 0;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* =============================================
   Responsive Design
   ============================================= */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 2rem;
        --font-size-2xl: 1.5rem;
        --spacing-3xl: 3rem;
    }

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

    .nav-links {
        gap: var(--spacing-md);
    }

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

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

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

    .hero-description {
        margin: 0 auto;
    }

    .hero-availability {
        margin: 0 auto var(--spacing-lg) auto;
    }

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

    .image-placeholder {
        max-width: 300px;
    }

    .tech-grid {
        grid-template-columns: repeat(3, 1fr);
    }

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

@media (max-width: 480px) {
    :root {
        --font-size-3xl: 1.75rem;
        --spacing-lg: 1rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .navbar {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }

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

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