:root {
    --primary-color: #007BFF;
    --dark-color: #333333;
    --light-color: #f4f4f4;
    --white-color: #ffffff;
    --text-color: #555555;
    --font-family: 'Poppins', sans-serif;
    --transition-speed: 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white-color);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

h1, h2, h3 {
    color: var(--dark-color);
    margin-bottom: 1rem;
    font-weight: 600;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.2rem; }
p { margin-bottom: 1rem; }

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-speed);
}

a:hover {
    color: #0056b3;
}

.bg-light {
    background-color: var(--light-color);
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: var(--white-color);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-family: var(--font-family);
    font-size: 1rem;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
}

.btn:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
}

.header {
    background: var(--white-color);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
}

.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark-color);
}
.nav-brand:hover {
    color: var(--dark-color);
}

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

.nav-menu li {
    margin-left: 1.5rem;
}

.nav-menu a {
    color: var(--text-color);
    font-weight: 400;
    position: relative;
    padding-bottom: 5px;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width var(--transition-speed);
}

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

.content-section {
    padding: 6rem 0;
}

.hero-section {
    background-color: var(--white-color);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 70px;
}

.hero-section .subtitle {
    font-size: 1.2rem;
    font-weight: 300;
}

.about-content {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.profile-pic {
    border-radius: 50%;
    width: 150px;
    height: 150px;
    object-fit: cover;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--white-color);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.12);
}

.hobby-card {
    text-align: center;
}

.hobby-card svg {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.contact-form {
    max-width: 600px;
    margin: 2rem auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--dark-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-family: var(--font-family);
    font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 5px rgba(0, 123, 255, 0.5);
}

.contact-alternative {
    text-align: center;
    margin-top: 2rem;
}

.form-success-message {
    text-align: center;
    margin-top: 1rem;
    color: green;
    font-weight: 600;
}

.footer {
    text-align: center;
    padding: 2rem 0;
    background: var(--dark-color);
    color: var(--light-color);
}

.hamburger {
    display: none;
    cursor: pointer;
    background: none;
    border: none;
}

.hamburger .bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--dark-color);
    transition: all var(--transition-speed);
}

@media(max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 1.8rem; }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--white-color);
        width: 100%;
        height: calc(100vh - 70px);
        text-align: center;
        transition: left var(--transition-speed);
        padding-top: 2rem;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        margin: 1.5rem 0;
    }

    .hamburger {
        display: block;
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

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

@media(max-width: 500px) {
    .container {
        padding: 0 1rem;
    }

    .hero-section {
        height: 70vh;
    }

    h1 { font-size: 2rem; }
}

.hobby-card .hobby-icon {
    width: 48px;
    height: 48px;
    object-fit: contain;
    margin-bottom: 10px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.hobby-card h3 {
    font-size: 1.2em;
    margin-top: 0;
    margin-bottom: 5px;
}