:root {
    color-scheme: light dark;
    --bg: #ffffff;
    --text: #000000;
    --border: #e5e5e5;
    --border-strong: #000000;
    --code-bg: #f9f9f9;
    --accent: #3b82f6;
    --success: #10b981;
    --transition-base: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

[data-theme="dark"] {
    --bg: #000000;
    --text: #ffffff;
    --border: #262626;
    --border-strong: #ffffff;
    --code-bg: #111111;
}

* {
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

html,
body {
    margin: 0;
    padding: 0;
    font-family:
        ui-sans-serif,
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    scroll-behavior: smooth;
}

main {
    width: min(1100px, 92vw);
    margin: 0 auto;
}

.layout {
    display: grid;
    grid-template-columns: minmax(220px, 260px) 1fr;
    gap: 80px;
    padding-top: 64px;
    align-items: start;
}

/* Sidebar / Rail */
.rail {
    position: sticky;
    top: 64px;
    align-self: start;
    display: grid;
    gap: 32px;
}

.brandmark {
    text-decoration: none;
    color: inherit;
    display: grid;
    gap: 12px;
}

.mark {
    width: 28px;
    height: 28px;
    border: 1.5px solid var(--text);
    background: transparent;
    display: inline-block;
    position: relative;
    transition: transform var(--transition-bounce);
    cursor: pointer;
}

.brandmark:visited {
    color: inherit;
}

.brandmark:hover {
    text-decoration: none;
}

.brandmark:hover .mark {
    transform: rotate(90deg);
}

.mark::after {
    content: "";
    position: absolute;
    width: 10px;
    height: 10px;
    border: 1.5px solid var(--text);
    background: var(--bg);
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.word {
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: -0.01em;
    text-decoration: none;
    color: inherit;
}

.kicker {
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 10px;
    opacity: 0.5;
    text-decoration: none;
    color: inherit;
}

/* Theme Switcher */
.theme-switch {
    display: flex;
    gap: 2px;
    padding: 2px;
    border: 1px solid var(--border);
    width: fit-content;
    border-radius: 6px;
}

.theme-option {
    border: none;
    background: transparent;
    color: var(--text);
    padding: 6px 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.4;
    border-radius: 4px;
    transition: all var(--transition-base);
}

.theme-option svg {
    width: 16px;
    height: 16px;
    stroke-width: 1.5px;
}

.theme-option:hover {
    opacity: 0.8;
    background: var(--code-bg);
}

.theme-option.is-active {
    opacity: 1;
    background: var(--text);
    color: var(--bg);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Navigation */
.rail-nav {
    display: grid;
    gap: 4px;
    position: relative;
    padding-left: 16px;
}

.rail-nav a {
    font-size: 14px;
    color: var(--text);
    text-decoration: none;
    padding: 6px 0;
    opacity: 0.5;
    transition: all var(--transition-base);
    position: relative;
}

.rail-nav a:hover {
    opacity: 0.85;
}


.rail-nav a.is-active {
    opacity: 1;
    font-weight: 600;
}

.rail-links {
    display: grid;
    gap: 12px;
    margin-top: 12px;
    border-top: 1px solid var(--border);
    padding-top: 24px;
}

.rail-links a {
    font-size: 13px;
    color: var(--text);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    opacity: 0.6;
    transition: opacity var(--transition-base);
}

.rail-links a:hover {
    opacity: 1;
}

.rail-links svg {
    width: 16px;
    height: 16px;
}

/* Page / Sections */
.page {
    position: relative;
    padding-bottom: 0;
}

.panel-section {
    display: none;
    opacity: 0;
    transform: translateY(12px);
    transition:
        opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.panel-section.is-active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.nav-indicator {
    position: absolute;
    left: 0;
    top: 0;
    width: 4px;
    height: 4px;
    background: var(--text);
    border-radius: 999px;
    opacity: 0;
    transform: translateY(0) scale(0.85);
    transition: transform 0.55s cubic-bezier(0.16, 1, 0.3, 1), opacity var(--transition-base);
    will-change: transform;
    pointer-events: none;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    line-height: 1.1;
    margin: 0 0 24px;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.lede {
    font-size: 1.15rem;
    color: var(--text);
    opacity: 0.7;
    max-width: 640px;
    margin-bottom: 40px;
}

h2 {
    font-size: 1.75rem;
    margin: 0 0 24px;
    letter-spacing: -0.02em;
}

h3 {
    font-size: 1rem;
    margin: 0 0 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.8;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 40px;
    margin: 48px 0;
}

.feature-item {
    display: grid;
    gap: 12px;
}

.feature-item h4 {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
}

.feature-item p {
    margin: 0;
    font-size: 14px;
    opacity: 0.6;
    line-height: 1.5;
}

/* Components */
.cta {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
    margin: 24px 0 40px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 18px;
    min-height: 44px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text);
    transition: transform var(--transition-base), background var(--transition-base), border-color var(--transition-base), opacity var(--transition-base);
}

.btn.primary {
    background: var(--text);
    color: var(--bg);
    border-color: var(--text);
}

.btn:hover {
    transform: translateY(-1px);
}

.btn.primary:hover {
    opacity: 0.95;
}

.btn.external {
    padding-right: 18px;
}

.btn.external:hover {
    background: var(--code-bg);
    border-color: var(--text);
}

.quick {
    display: grid;
    gap: 16px;
}

.quick .cmd {
    padding: 16px 20px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--code-bg);
    transition: border-color var(--transition-base);
}

.quick .cmd:hover {
    border-color: var(--text);
}

.quick span {
    display: block;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 8px;
    opacity: 0.5;
}

.quick code {
    font-size: 0.95rem;
}

pre {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px 20px;
    margin: 16px 0;
    overflow-x: auto;
    position: relative;
}

code {
    font-family:
        "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
        monospace;
    font-size: 0.9rem;
}

.grid {
    display: grid;
    gap: 32px;
    margin: 32px 0;
}

.section-footer {
    margin-top: 28px;
    padding-top: 16px;
    padding-bottom: 18px;
    border-top: 1px dashed var(--border);
}

.edit-link {
    font-size: 12px;
    color: var(--text);
    text-decoration: none;
    opacity: 0.4;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: opacity var(--transition-base);
}

.edit-link:hover {
    opacity: 1;
}

/* External Link Animation */
.external {
    position: relative;
    padding-right: 16px;
}

.external::after {
    content: "";
    display: inline-block;
    width: 11px;
    height: 11px;
    margin-left: 4px;
    background-color: currentColor;
    mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><line x1="7" y1="17" x2="17" y2="7"></line><polyline points="7 7 17 7 17 17"></polyline></svg>')
        no-repeat center / contain;
    -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><line x1="7" y1="17" x2="17" y2="7"></line><polyline points="7 7 17 7 17 17"></polyline></svg>')
        no-repeat center / contain;
    opacity: 0;
    transform: translate(-3px, 3px);
    transition: all var(--transition-base);
}

.external:hover::after {
    opacity: 1;
    transform: translate(0, 0);
}

/* Copy Button */
.copy-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    width: 32px;
    height: 32px;
    padding: 7px;
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition-base);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

pre:hover .copy-btn {
    opacity: 1;
}

.quick .cmd:hover .copy-btn {
    opacity: 1;
}

.copy-btn:hover {
    border-color: var(--text);
    background: var(--text);
    color: var(--bg);
}

.copy-btn svg {
    width: 100%;
    height: 100%;
}

.copy-btn.copied {
    color: var(--success);
    border-color: var(--success);
}

/* Mobile */
@media (max-width: 900px) {
    .layout {
        grid-template-columns: 1fr;
        gap: 48px;
        padding-top: 32px;
    }

    .rail {
        position: static;
        border-bottom: 1px solid var(--border);
        padding-bottom: 32px;
    }

    .rail-nav {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
}


.brandmark, .brandmark * {
    text-decoration: none !important;
    color: inherit !important;
}

.quick .cmd { position: relative; }