:root {
    --bg-color: #ffffff;
    --text-color: #1a2a3a;
    --line-color: #3b82f6;
    --card-bg: #f0f7ff;
    --accent-color: #0284c7;
    --border-style: 2px solid var(--line-color);
}
body.dark-mode {
    --bg-color: #0b132b;
    --text-color: #e0f2fe;
    --line-color: #38bdf8;
    --card-bg: #1c2541;
    --accent-color: #00b4d8;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}
body {
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 8%;
    border-bottom: var(--border-style);
    position: sticky;
    top: 0;
    background-color: var(--bg-color);
    z-index: 100;
}
.logo {
    font-size: 1.5rem;
    font-weight: bold;
    letter-spacing: 1px;
}
.logo span {
    color: var(--accent-color);
}
.nav-links {
    display: flex;
    list-style: none;
    gap: 20px;
}
.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
}
.nav-links a:hover {
    color: var(--accent-color);
}
.btn-toggle {
    background: transparent;
    border: var(--border-style);
    color: var(--text-color);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
}
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4rem 8%;
    gap: 2rem;
    border-bottom: var(--border-style);
}
.hero-content {
    max-width: 500px;
}
.hero-content h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}
.cta-btn {
    display: inline-block;
    margin-top: 1.5rem;
    padding: 10px 24px;
    background-color: var(--accent-color);
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
    font-weight: bold;
}
.hero-image img {
    width: 320px;
    height: 320px;
    object-fit: cover;
    border-radius: 50%;
    border: var(--border-style);
    background-color: #e2e8f0;
}
.section {
    padding: 4rem 8%;
    border-bottom: var(--border-style);
}
.section-title {
    text-align: center;
    margin-bottom: 2.5rem;
    font-size: 2rem;
    border-bottom: 3px solid var(--accent-color);
    display: inline-block;
    left: 50%;
    position: relative;
    transform: translateX(-50%);
}
.about-container {
    display: flex;
    gap: 20px;
}
.about-card {
    flex: 1;
    background-color: var(--card-bg);
    padding: 1.5rem;
    border: var(--border-style);
    border-radius: 8px;
}
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}
.project-card {
    background-color: var(--card-bg);
    border: var(--border-style);
    border-radius: 8px;
    overflow: hidden;
}
.project-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    background-color: #cbd5e1;
}
.project-info {
    padding: 1rem;
}
.contact-form {
    max-width: 500px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.contact-form input, 
.contact-form textarea {
    width: 100%;
    padding: 12px;
    border: var(--border-style);
    border-radius: 6px;
    background-color: var(--card-bg);
    color: var(--text-color);
}
.submit-btn {
    padding: 12px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
}
footer {
    text-align: center;
    padding: 1.5rem;
    font-size: 0.9rem;
}