:root {
    --bg-color: #ffffff;
    --text-color: #1a1a1a;
    --primary-color: #00b900;
    --primary-dark: #008f00;
    --focus-color: #0056b3;
    --card-bg: #f8f9fa;
    --border-color: #e0e0e0;
    --contact-color: #0056b3;
    --contact-dark: #004494;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #121212;
        --text-color: #f1f1f1;
        --primary-color: #00d600;
        --primary-dark: #00b900;
        --card-bg: #1e1e1e;
        --border-color: #333333;
        --contact-color: #339af0;
        --contact-dark: #1c7ed6;
    }
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    font-size: 1rem;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--focus-color);
    color: white;
    padding: 8px 16px;
    z-index: 100;
    font-weight: bold;
    text-decoration: none;
    transition: top 0.2s ease-in-out;
}

.skip-link:focus {
    top: 0;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

header {
    background-color: var(--primary-color);
    color: #ffffff;
    padding: 1.5rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

h1 {
    margin: 0;
    font-size: 1.5rem;
}

h2 {
    color: var(--primary-dark);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-top: 0;
}

select {
    padding: 0.5rem;
    font-size: 1rem;
    border-radius: 4px;
    border: 1px solid #ffffff;
    background-color: var(--bg-color);
    color: var(--text-color);
}

main {
    padding: 2rem 0;
}

main:focus {
    outline: none;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.feature-list {
    padding-left: 1.5rem;
}

.feature-list li {
    margin-bottom: 0.75rem;
}

.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1rem;
}

.button {
    display: inline-block;
    background-color: var(--primary-color);
    color: #ffffff !important;
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-weight: bold;
    transition: background-color 0.2s, color 0.2s;
}

.button:hover {
    background-color: var(--primary-dark);
}

.button-secondary {
    background-color: #555555;
}
.button-secondary:hover {
    background-color: #333333;
}

.button-outline {
    background-color: transparent;
    border: 2px solid var(--text-color);
    color: var(--text-color) !important;
}
.button-outline:hover {
    background-color: var(--text-color);
    color: var(--bg-color) !important;
}

.button-line {
    background-color: #06c755;
    color: #ffffff !important;
}
.button-line:hover {
    background-color: #05a044;
}

.button-contact {
    background-color: var(--contact-color);
    color: #ffffff !important;
}
.button-contact:hover {
    background-color: var(--contact-dark);
}

*:focus-visible {
    outline: 3px solid var(--focus-color);
    outline-offset: 3px;
}

footer {
    text-align: center;
    padding: 2rem 0;
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
}