/* CSS Variables for theming */
:root {
    --bg-color: #ffffff;
    --text-color: #000000;
    --accent-color: #666666;
    --border-color: #e0e0e0;
    --hover-color: #f8f9fa;
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 32px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] {
    --bg-color: #0a0a0a;
    --text-color: #f0f0f0;
    --accent-color: #999999;
    --border-color: #2a2a2a;
    --hover-color: #1a1a1a;
    --shadow-light: 0 1px 3px rgba(255, 255, 255, 0.1);
    --shadow-medium: 0 4px 12px rgba(255, 255, 255, 0.15);
    --shadow-heavy: 0 8px 32px rgba(255, 255, 255, 0.2);
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    overflow-x: hidden;
    position: relative;
}

/* Starfield background */
.stars {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.star {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--accent-color);
    border-radius: 50%;
    animation: twinkle 3s ease-in-out infinite;
}

.star:nth-child(odd) {
    animation-delay: 1s;
}

.star:nth-child(3n) {
    animation-delay: 2s;
}

.star:nth-child(4n) {
    animation-delay: 0.5s;
}

.star:nth-child(5n) {
    animation-delay: 1.5s;
}

@keyframes twinkle {
    0%, 100% { 
        opacity: 0.3;
        transform: scale(1);
    }
    50% { 
        opacity: 1;
        transform: scale(1.2);
    }
}

/* Typography */
h1, h2, h3 {
    font-weight: 300;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

h1 {
    font-size: 3.5rem;
    font-weight: 100;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    position: relative;
    font-weight: 200;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 1px;
    background: var(--text-color);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

h2.animate::after {
    transform: scaleX(1);
}

h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    font-weight: 400;
}

p {
    margin-bottom: 1.5rem;
    font-size: 1rem;
    line-height: 1.8;
}

/* Layout */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 3rem;
}

/* Header */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-color);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 1.5rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 100;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    overflow: hidden;
}

.theme-toggle::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    transition: left 0.5s;
}

.theme-toggle:hover::before {
    left: 100%;
}

.theme-toggle:hover {
    border-color: var(--text-color);
    transform: translateY(-1px);
}

.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
    position: absolute;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

[data-theme="dark"] .theme-toggle .sun-icon {
    transform: translateY(-30px) rotate(180deg);
    opacity: 0;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
}

.theme-toggle .sun-icon {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
}

.theme-toggle .moon-icon {
    transform: translateY(30px) rotate(-180deg);
    opacity: 0;
}

/* Main content */
main {
    margin-top: 100px;
}

section {
    padding: 8rem 0;
    position: relative;
    overflow: hidden;
}

section::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
    transition: left 1s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

section.animate::before {
    left: 100%;
}

/* Hero section */
.hero {
    text-align: center;
    padding: 12rem 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(0,0,0,0.02) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(0,0,0,0.02) 0%, transparent 50%);
    position: relative;
}

[data-theme="dark"] .hero {
    background: 
        radial-gradient(circle at 20% 50%, rgba(255,255,255,0.02) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(255,255,255,0.02) 0%, transparent 50%);
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.hero-image {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border-color);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease-out 0.1s forwards;
    transition: all 0.3s ease;
}

.hero-image:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 100;
    letter-spacing: 0.05em;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease-out 0.3s forwards;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--accent-color);
    margin-bottom: 0;
    font-weight: 300;
    letter-spacing: 0.1em;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease-out 0.6s forwards;
}

/* Work grid */
.work-grid {
    display: grid;
    gap: 2rem;
    margin-top: 3rem;
}

.work-item {
    padding: 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    background: var(--bg-color);
    position: relative;
    overflow: hidden;
}

.work-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--text-color);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.work-item:hover::before {
    transform: scaleX(1);
}

.work-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    border-color: var(--text-color);
}

.work-item h3 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 1rem;
    font-weight: 300;
}

.work-item p {
    color: var(--accent-color);
    margin-bottom: 0;
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Lists */
ul {
    list-style: none;
    padding-left: 0;
}

li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    transition: all 0.3s ease;
}

li:last-child {
    border-bottom: none;
}

li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-size: 0.8rem;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateX(-10px);
}

li:hover::before {
    opacity: 1;
    transform: translateX(0);
}

li:hover {
    padding-left: 1.5rem;
    color: var(--text-color);
}

/* Links */
a {
    color: var(--text-color);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
    position: relative;
}

a::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--text-color);
    transition: width 0.3s ease;
}

a:hover::after {
    width: 100%;
}

/* Footer */
footer {
    background: var(--bg-color);
    text-align: center;
    padding: 3rem 0;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--accent-color);
}

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

@keyframes slideInFromLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .nav-content {
        padding: 1.5rem;
    }
    
    .hero-image {
        width: 120px;
        height: 120px;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    section {
        padding: 5rem 0;
    }
    
    .hero {
        padding: 8rem 0;
    }
    
    .work-item {
        padding: 2rem;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Scroll animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fade-in.animate {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.slide-in-left.animate {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.slide-in-right.animate {
    opacity: 1;
    transform: translateX(0);
}