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

:root {
    --bg-dark: #000000;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #a1a1a6;
    --text-tertiary: #6e6e73;
    --accent: #DF9535;
    --text-accent: #ffffff;
    --border: rgba(255, 255, 255, 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-dark);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background: rgba(255, 255, 255, 0.2);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Site nav */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(0, 0, 0, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.site-nav-inner {
    max-width: 680px;
    margin: 0 auto;
    padding: 0.5rem 0.75rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.site-nav-brand {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: -0.01em;
    white-space: nowrap;
    min-width: 0;
}

.site-nav-brand:hover {
    color: var(--accent);
}

.site-nav-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    margin: 0;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    flex-shrink: 0;
}

.site-nav-toggle:hover {
    border-color: rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.05);
}

.site-nav-toggle:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.site-nav-toggle-bars {
    display: block;
    width: 1.125rem;
    height: 2px;
    background: currentColor;
    position: relative;
    transition: background 0.2s ease;
}

.site-nav-toggle-bars::before,
.site-nav-toggle-bars::after {
    content: "";
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: currentColor;
    transition: transform 0.2s ease, top 0.2s ease;
}

.site-nav-toggle-bars::before { top: -6px; }
.site-nav-toggle-bars::after { top: 6px; }

.site-nav.is-open .site-nav-toggle-bars {
    background: transparent;
}

.site-nav.is-open .site-nav-toggle-bars::before {
    top: 0;
    transform: rotate(45deg);
}

.site-nav.is-open .site-nav-toggle-bars::after {
    top: 0;
    transform: rotate(-45deg);
}

.site-nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem 1.25rem;
    flex-wrap: wrap;
    list-style: none;
}

.site-nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.2s ease;
    padding: 0.25rem 0;
    border-bottom: 2px solid transparent;
}

.site-nav-links a:hover {
    color: var(--text-primary);
}

.site-nav-links a.active {
    color: var(--text-primary);
    border-bottom-color: var(--accent);
}

@media (max-width: 639px) {
    .site-nav-toggle {
        display: inline-flex;
    }

    .site-nav-links {
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        width: 100%;
        flex-basis: 100%;
        padding: 0.25rem 0 0.5rem;
        border-top: 1px solid var(--border);
        margin-top: 0.25rem;
    }

    .site-nav.is-open .site-nav-links {
        display: flex;
    }

    .site-nav-links li {
        width: 100%;
    }

    .site-nav-links a {
        display: block;
        padding: 0.875rem 0.25rem;
        font-size: 1rem;
        border-bottom: 1px solid var(--border);
    }

    .site-nav-links li:last-child a {
        border-bottom: none;
    }

    .site-nav-links a.active {
        border-bottom-color: var(--border);
        color: var(--accent);
    }

    .site-nav-links li:last-child a.active {
        border-bottom: none;
    }
}

.container {
    max-width: 680px;
    margin: 0 auto;
    padding: 1.25rem 0.75rem;
    flex: 1;
    width: 100%;
    animation: fadeIn 1s ease-out;
}

.page-footer {
    text-align: center;
    margin-top: 2rem;
    padding: 1.5rem 1rem 2rem;
}

.page-footer a {
    color: var(--text-tertiary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.3s ease;
}

.page-footer a:hover {
    color: var(--text-secondary);
}

.page-footer .sep {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    margin: 0 0.35rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    background: var(--accent);
    color: var(--text-accent);
    border: transparent;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.btn:hover {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.section-heading {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
    text-align: center;
}

.body-text {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.body-text + .body-text {
    margin-top: 1rem;
}

@media (min-width: 640px) {
    .site-nav-inner {
        padding: 0.875rem 2rem;
    }

    .container {
        padding: 2rem;
    }

    .section-heading {
        font-size: 1.75rem;
    }
}