:root {
    --color-bg: #1e1f22;
    --color-surface: #2b2d31;
    --color-surface-hover: #313338;
    --color-text: #f2f3f5;
    --color-text-muted: #b5bac1;
    --color-accent: #5865f2;
    --color-accent-hover: #4752c4;
    --color-border: #3f4147;
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}

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

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.15s ease-in-out;
}

a:hover, a:focus-visible {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

a:focus-visible, button:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 4.5rem;
}

.brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.025em;
}

.nav-menu {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-menu a {
    color: var(--color-text-muted);
    font-weight: 500;
    text-decoration: none;
    padding: 0.5rem 0;
}

.nav-menu a:hover, .nav-menu a[aria-current="page"] {
    color: var(--color-text);
}

main {
    flex: 1;
}

.hero {
    padding: 6rem 0 4rem;
    text-align: center;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 4rem);
    line-height: 1.1;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 1.25rem;
}

.hero p {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-muted);
    max-width: 65ch;
    margin: 0 auto 2.5rem;
}

.action-group {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 3rem;
    padding: 0 1.5rem;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none !important;
    border: none;
    cursor: pointer;
    transition: background-color 0.15s ease-in-out, transform 0.1s ease;
    touch-action: manipulation;
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background-color: var(--color-accent);
    color: #ffffff;
}

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

.btn-secondary {
    background-color: var(--color-surface-hover);
    color: var(--color-text);
}

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

.features {
    padding: 4rem 0 6rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.75rem;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
}

.feature-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.document-wrapper {
    padding: 3rem 0 6rem;
}

.document {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.75rem;
    padding: clamp(1.5rem, 5vw, 3rem);
    max-width: 80ch;
    margin: 0 auto;
}

.document h1 {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.document time {
    display: block;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-bottom: 2.5rem;
}

.document h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 2.5rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.document h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 1.5rem 0 0.75rem;
}

.document p {
    margin-bottom: 1rem;
}

.document ul {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.document li {
    margin-bottom: 0.5rem;
}

.document strong {
    color: var(--color-text);
    font-weight: 600;
}

footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 2rem 0;
    text-align: center;
}

footer p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

@media (max-width: 48rem) {
    .header-inner {
        flex-direction: column;
        justify-content: center;
        gap: 1rem;
        padding: 1rem 0;
    }

    .nav-menu {
        width: 100%;
        justify-content: center;
    }

    .action-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}