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

:root {
    /* Color Palette - Dark & White */
    --color-bg-dark: #0a0a0a;
    --color-bg-darker: #050505;
    --color-bg-card: #121212;
    --color-bg-card-hover: #1a1a1a;
    --color-text-primary: #ffffff;
    --color-text-secondary: #a0a0a0;
    --color-text-muted: #707070;
    --color-accent: #e5e5e5;
    --color-border: #2a2a2a;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s ease;
    --transition-slow: 0.6s ease;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
}

html {
    scroll-behavior: smooth;
}

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

/* ===========================
   NAVIGATION
   =========================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-medium);
}

.nav.scrolled {
    background-color: rgba(10, 10, 10, 0.95);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-text-primary);
    transition: width var(--transition-medium);
}

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

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

/* ===========================
   HERO SECTION
   =========================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.02) 0%, transparent 50%),
        var(--color-bg-darker);
    z-index: 0;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 100px 100px;
    opacity: 0.5;
    animation: grid-move 20s linear infinite;
}

@keyframes grid-move {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(100px, 100px);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 2rem;
}

.hero-text {
    max-width: 900px;
    margin: 0 auto;
}

.hero-greeting {
    display: block;
    font-size: 1.2rem;
    font-weight: var(--font-weight-regular);
    color: var(--color-text-secondary);
    margin-bottom: 0.5rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.hero-name {
    display: block;
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #ffffff 0%, #a0a0a0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: var(--font-weight-light);
    color: var(--color-text-primary);
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin-bottom: 3rem;
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 1rem 2.5rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-medium);
    display: inline-block;
}

.btn-primary {
    background-color: var(--color-text-primary);
    color: var(--color-bg-dark);
}

.btn-primary:hover {
    background-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.1);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-text-primary);
    transform: translateY(-2px);
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-indicator span {
    display: block;
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, transparent, var(--color-text-primary), transparent);
    animation: scroll-pulse 2s ease-in-out infinite;
}

@keyframes scroll-pulse {
    0%, 100% {
        opacity: 0.3;
        transform: scaleY(0.8);
    }
    50% {
        opacity: 1;
        transform: scaleY(1);
    }
}

/* ===========================
   SECTIONS
   =========================== */
.section {
    padding: var(--spacing-xl) 2rem;
    position: relative;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: var(--font-weight-bold);
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
    text-align: center;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: 4rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

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

.about-content {
    max-width: 800px;
    margin: 3rem auto 0;
}

.about-text p {
    font-size: 1.1rem;
    line-height: 1.9;
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
}

.about-text strong {
    color: var(--color-text-primary);
    font-weight: var(--font-weight-semibold);
}

/* ===========================
   SKILLS SECTION
   =========================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.skill-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 2.5rem;
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-text-primary), transparent);
    opacity: 0;
    transition: opacity var(--transition-medium);
}

.skill-card:hover {
    background-color: var(--color-bg-card-hover);
    transform: translateY(-5px);
    border-color: var(--color-text-secondary);
}

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

.skill-icon {
    width: 50px;
    height: 50px;
    margin-bottom: 1.5rem;
    color: var(--color-text-primary);
}

.skill-icon svg {
    width: 100%;
    height: 100%;
}

.skill-card h3 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: 1rem;
    color: var(--color-text-primary);
}

.skill-card p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
}

/* ===========================
   HOBBIES SECTION
   =========================== */
.hobbies {
    background-color: var(--color-bg-card);
}

.hobbies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.hobby-card {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    aspect-ratio: 4/3;
    cursor: pointer;
}

.hobby-image {
    position: relative;
    width: 100%;
    height: 100%;
}

.hobby-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.hobby-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, transparent 0%, rgba(0,0,0,0.8) 100%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 2rem;
    transition: background var(--transition-medium);
}

.hobby-card:hover .hobby-image img {
    transform: scale(1.05);
}

.hobby-card:hover .hobby-overlay {
    background: linear-gradient(to bottom, transparent 0%, rgba(0,0,0,0.9) 100%);
}

.hobby-overlay h3 {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: 0.5rem;
}

.hobby-overlay p {
    font-size: 1rem;
    color: var(--color-text-secondary);
}

/* ===========================
   CONTACT SECTION
   =========================== */
.contact-content {
    max-width: 600px;
    margin: 3rem auto 0;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem 2rem;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-text-primary);
    transition: all var(--transition-medium);
}

.contact-link svg {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.contact-link span {
    font-size: 1.1rem;
    font-weight: var(--font-weight-medium);
}

.contact-link:hover {
    background-color: var(--color-bg-card-hover);
    border-color: var(--color-text-primary);
    transform: translateX(10px);
}

/* ===========================
   FOOTER
   =========================== */
.footer {
    padding: 3rem 2rem;
    background-color: var(--color-bg-darker);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* ===========================
   ANIMATIONS
   =========================== */
.fade-in {
    animation: fadeIn 1s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

[data-aos] {
    opacity: 0;
    transition: opacity 0.8s ease, transform 0.8s ease;
}

[data-aos].aos-animate {
    opacity: 1;
}

[data-aos="fade-up"] {
    transform: translateY(50px);
}

[data-aos="fade-up"].aos-animate {
    transform: translateY(0);
}

/* ===========================
   RESPONSIVE DESIGN
   =========================== */
@media (max-width: 768px) {
    .nav-menu {
        gap: 1.5rem;
    }
    
    .nav-link {
        font-size: 0.85rem;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .section {
        padding: var(--spacing-lg) 1.5rem;
    }
    
    .skills-grid,
    .hobbies-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 1rem 1.5rem;
    }
    
    .nav-menu {
        display: none;
    }
    
    .hero-greeting {
        font-size: 0.9rem;
    }
    
    .skill-card,
    .contact-link {
        padding: 1.5rem;
    }
}