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

:root {
    --primary-color: #333;
    --secondary-color: #f39c12;
    --text-color: #333;
    --bg-color: #f9f9f9;
    --header-bg: #222;
    --header-text: #fff;
    --project-bg: white;
    --shadow-color: rgba(0,0,0,0.1);
    --transition-speed: 0.3s;
}

@media (prefers-color-scheme: dark) {
    :root {
        --text-color: #f1f1f1;
        --bg-color: #121212;
        --header-bg: #1f1f1f;
        --project-bg: #1e1e1e;
        --shadow-color: rgba(0,0,0,0.3);
    }
}

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color var(--transition-speed) ease,
                color var(--transition-speed) ease;
    overflow-x: hidden;
}

/* Header styles */
header {
    background: var(--header-bg);
    color: var(--header-text);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px var(--shadow-color);
    transition: background-color var(--transition-speed) ease,
                box-shadow var(--transition-speed) ease;
    animation: slideDown 0.5s ease-out;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 90%;
    max-width: 1200px;
    margin: auto;
}

nav h1 {
    font-size: 1.5rem;
    font-weight: 600;
    animation: fadeIn 1s ease-out;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

nav ul li {
    animation: fadeIn 1s ease-out;
    animation-fill-mode: both;
}

nav ul li:nth-child(1) { animation-delay: 0.2s; }
nav ul li:nth-child(2) { animation-delay: 0.4s; }
nav ul li:nth-child(3) { animation-delay: 0.6s; }
nav ul li:nth-child(4) { animation-delay: 0.8s; }

nav ul li a {
    text-decoration: none;
    color: var(--header-text);
    font-weight: 500;
    transition: all var(--transition-speed) ease;
    padding: 0.5rem 0;
    position: relative;
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary-color);
    transition: width var(--transition-speed) ease;
}

nav ul li a:hover::after {
    width: 100%;
}

section {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: auto;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease-out forwards;
}

#home {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
}

#home h2 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: 1rem;
    line-height: 1.2;
    animation: slideInLeft 1s ease-out;
}

#home p {
    font-size: clamp(1rem, 2vw, 1.25rem);
    margin-bottom: 2rem;
    max-width: 600px;
    animation: slideInRight 1s ease-out;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: all var(--transition-speed) ease;
    font-weight: 500;
    animation: fadeIn 1s ease-out 0.5s both;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

/* Projects section */
.projects {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.project {
    background: var(--project-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px var(--shadow-color);
    transition: all var(--transition-speed) ease;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease-out forwards;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.project h3 {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.project p {
    color: var(--text-color);
    line-height: 1.6;
    flex-grow: 1;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0;
}

.tech-tag {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    transition: all var(--transition-speed) ease;
}

.tech-tag:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
}

.project-links {
    display: flex;
    gap: 1rem;
    margin-top: auto;
}

.btn.secondary {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn.secondary:hover {
    background: var(--primary-color);
    color: white;
}

.project:nth-child(1) { animation-delay: 0.2s; }
.project:nth-child(2) { animation-delay: 0.4s; }
.project:nth-child(3) { animation-delay: 0.6s; }
.project:nth-child(4) { animation-delay: 0.8s; }

.project:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 15px var(--shadow-color);
}

/* Social links */
.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    color: var(--text-color);
    text-decoration: none;
    transition: all var(--transition-speed) ease;
    padding: 0.5rem;
    border-radius: 5px;
    animation: fadeIn 1s ease-out;
}

.social-links a:hover {
    color: var(--secondary-color);
    transform: translateY(-3px);
}

/* Dark mode styles */
.dark-mode {
    --text-color: #f1f1f1;
    --bg-color: #121212;
    --header-bg: #1f1f1f;
    --project-bg: #1e1e1e;
    --shadow-color: rgba(0,0,0,0.3);
}

.dark-mode .btn.secondary {
    border-color: var(--secondary-color);
    color: var(--secondary-color);
}

.dark-mode .btn.secondary:hover {
    background: var(--secondary-color);
    color: var(--bg-color);
}

/* Responsive Design */
@media (max-width: 1024px) {
    section {
        padding: 3rem 1.5rem;
    }
    
    .projects {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    nav {
        padding: 0.5rem 0;
    }

    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--header-bg);
        padding: 1rem;
        text-align: center;
        box-shadow: 0 4px 6px var(--shadow-color);
    }

    nav ul.show {
        display: flex;
        animation: slideDown 0.3s ease-out;
    }

    .hamburger {
        display: block;
        background: none;
        border: none;
        color: var(--header-text);
        font-size: 1.5rem;
        cursor: pointer;
        padding: 0.5rem;
        transition: transform var(--transition-speed) ease;
    }

    .hamburger:hover {
        transform: rotate(90deg);
    }

    #home {
        text-align: center;
        align-items: center;
    }

    #home p {
        margin: 0 auto 2rem;
    }

    .project-links {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 480px) {
    section {
        padding: 2rem 1rem;
    }

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

    .project {
        padding: 1rem;
    }

    .tech-stack {
        justify-content: center;
    }
}

/* Animation Keyframes */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}