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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --text-dark: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-color);
    background: rgba(37, 99, 235, 0.1);
}

.btn-login {
    background: var(--primary-color) !important;
    color: white !important;
}

.user-menu {
    display: none;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    background: rgba(37, 99, 235, 0.1);
    transition: all 0.3s ease;
}

.user-menu:hover {
    background: rgba(37, 99, 235, 0.15);
    transform: translateY(-2px);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.user-avatar-img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 5px;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 2px;
}

.page-header {
    padding: 8rem 2rem 3rem;
    text-align: center;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.page-header h1 {
    font-size: 2.5rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.about-content {
    padding: 3rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.about-placeholder {
    border: 3px dashed var(--border-color);
    border-radius: 16px;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-light);
}

.placeholder-box {
    text-align: center;
    color: var(--text-secondary);
}

.placeholder-box span {
    font-size: 1.5rem;
    font-weight: 600;
    display: block;
    margin-bottom: 0.5rem;
}

.footer {
    background: var(--text-dark);
    color: white;
    padding: 2rem;
    text-align: center;
    margin-top: 3rem;
}

.footer-content p {
    margin-bottom: 0.5rem;
}

.footer-content a {
    color: #93c5fd;
    text-decoration: none;
}

.footer-content a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 2rem;
        gap: 1rem;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .page-header {
        padding: 6rem 1.5rem 2rem;
    }

    .page-header h1 {
        font-size: 2rem;
    }
}