:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --border-color: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #79b8ff;
    --radius: 6px;
    --transition: 0.15s ease;
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
    font-size: 0.875rem;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
}

/* Sidebar toggle button */
.sidebar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    padding: 0;
    margin: 0;
    border: none;
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    transition: background-color var(--transition);
}

.sidebar-toggle:hover {
    background-color: var(--bg-tertiary);
}

.sidebar-toggle-icon {
    display: block;
    width: 1.25rem;
    height: 2px;
    background-color: currentColor;
    box-shadow: 0 -6px 0 currentColor, 0 6px 0 currentColor;
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 200;
    width: 100%;
    max-width: 14rem;
    padding: 0.5rem 0;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    transform: translateX(0);
    transition: transform var(--transition);
}

body.sidebar-collapsed .sidebar {
    transform: translateX(-100%);
}

.sidebar-sticky {
    position: -webkit-sticky;
    position: sticky;
    top: 48px;
    height: calc(100vh - 48px);
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
    overflow-x: hidden;
    overflow-y: auto;
}

.sidebar-search {
    padding: 0.25rem 0.75rem 0.5rem;
    margin-top: 10px;
}

.sidebar-search-input {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.8125rem;
    padding: 0.375rem 0.625rem;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.sidebar-search-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.sidebar-search-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.2);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.sidebar-search-input::-webkit-search-cancel-button {
    -webkit-appearance: none;
    appearance: none;
}

.sidebar-no-match {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    font-style: italic;
}

.sidebar-no-match span {
    color: var(--text-primary);
    font-style: normal;
}

.sidebar .nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    margin: 0 0.5rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius);
    transition: color var(--transition), background-color var(--transition);
}

.sidebar .nav-link:hover {
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
}

.sidebar .nav-link.active {
    color: var(--accent);
    background-color: rgba(88, 166, 255, 0.1);
    border-left: 3px solid var(--accent);
    margin-left: calc(0.5rem - 3px);
    padding-left: calc(1rem - 3px);
}

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

.sidebar .nav-link.active:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.sidebar .nav-link .feather {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    opacity: 0.8;
}

.sidebar .nav-link.active .feather {
    opacity: 1;
}

.sidebar-heading {
    padding: 0.75rem 1rem 0.25rem;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.sidebar-heading a {
    color: var(--text-secondary);
    transition: color var(--transition);
}

.sidebar-heading a:hover {
    color: var(--accent);
}

/* Main content */
main {
    min-height: calc(100vh - 48px);
    padding: 1.5rem;
    background-color: var(--bg-primary);
}

main .border-bottom {
    border-color: var(--border-color) !important;
}

/* Desktop: clear sidebar, center main in remaining space */
@media (min-width: 768px) {
    .container-fluid .row {
        padding-left: 14rem;
        /* Offset fixed sidebar */
        transition: padding-left var(--transition);
    }

    body.sidebar-collapsed .container-fluid .row {
        padding-left: 0;
    }


    main {
        margin-left: auto;
        margin-right: auto;
        max-width: 72rem;
        transition: margin var(--transition);
    }
}

/* Mobile: sidebar overlays when open, no offset when collapsed */
@media (max-width: 767px) {
    .container-fluid .row {
        padding-left: 0;
    }

    .sidebar {
        box-shadow: 4px 0 1rem rgba(0, 0, 0, 0.3);
    }

    body.sidebar-collapsed .sidebar {
        pointer-events: none;
        /* Allow clicks through when hidden */
    }
}

/* Navbar */
.navbar {
    background-color: var(--bg-secondary) !important;
    border-bottom: 1px solid var(--border-color);
}

.navbar-brand {
    padding: 0.75rem 1rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary) !important;
    text-decoration: none;
    border-left: 1px solid var(--border-color);
}

.navbar-brand:hover {
    color: var(--text-primary) !important;
    opacity: 0.9;
}

/* Footer */
footer {
    padding: 1rem 1.5rem;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

footer a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition);
}

footer a:hover {
    color: var(--accent-hover);
}

/* Desktop: footer clears the fixed sidebar, like main content does. */
/* Must come after the base footer rule so it wins the cascade. */
@media (min-width: 768px) {
    footer {
        padding-left: calc(14rem + 1.5rem);
        transition: padding-left var(--transition);
    }

    body.sidebar-collapsed footer {
        padding-left: 1.5rem;
    }
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.github-link {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    color: var(--text-secondary);
    transition: color var(--transition);
}

.github-link:hover {
    color: var(--text-primary);
}

.github-icon {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

/* Tool page */
.tool-slug {
    font-family: ui-monospace, SFMono-Regular, "Cascadia Code", Consolas, monospace;
    font-size: 0.8125rem;
}

.tool-result {
    margin: 0;
    padding: 0.75rem 1rem;
    font-family: ui-monospace, SFMono-Regular, "Cascadia Code", Consolas, monospace;
    font-size: 0.8125rem;
    line-height: 1.5;
    max-height: 22rem;
    overflow: auto;
    white-space: pre-wrap;
    word-break: break-word;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    min-height: 4.5rem;
}

.tool-result:empty::before {
    content: "Run a transform to see the output here.";
    color: var(--text-secondary);
    opacity: 0.6;
}

.tool-result-error {
    border-color: #f85149;
    color: #ffa19b;
}

.tool-textarea {
    font-family: ui-monospace, SFMono-Regular, "Cascadia Code", Consolas, monospace;
}

.form-text {
    margin-top: 0.375rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
}

.btn-copy {
    min-width: 5rem;
}

.btn-outline-secondary {
    --bs-btn-color: var(--text-secondary);
    --bs-btn-border-color: var(--border-color);
    --bs-btn-hover-bg: var(--bg-tertiary);
    --bs-btn-hover-color: var(--text-primary);
    --bs-btn-hover-border-color: var(--border-color);
}

.btn-primary {
    --bs-btn-bg: var(--accent);
    --bs-btn-border-color: var(--accent);
    --bs-btn-hover-bg: var(--accent-hover);
    --bs-btn-hover-border-color: var(--accent-hover);
    --bs-btn-active-bg: var(--accent);
}

/* Home page */
.home-hero {
    padding: 4rem 1.5rem 2rem;
    text-align: center;
}

.home-hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.home-hero p {
    color: var(--text-secondary);
    max-width: 38rem;
    margin: 0 auto;
}

.home-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(11rem, 1fr));
    gap: 0.75rem;
    padding: 0 1.5rem 3rem;
    max-width: 72rem;
    margin: 0 auto;
}

.tool-tile {
    display: block;
    padding: 0.875rem 1rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: border-color var(--transition), background-color var(--transition),
    transform var(--transition);
}

.tool-tile small {
    display: block;
    margin-top: 0.125rem;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 0.6875rem;
    color: var(--text-secondary);
}

.tool-tile:hover {
    border-color: var(--accent);
    background-color: var(--bg-tertiary);
    transform: translateY(-2px);
}

/* 404 page */
.page-404 {
    min-height: calc(100vh - 3rem);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    text-align: center;
    padding: 2rem;
}

.page-404 .display-4 {
    margin: 0;
    font-size: 5rem;
    font-weight: 700;
}

.page-404 p {
    color: var(--text-secondary);
    margin: 0;
    max-width: 28rem;
}

.btn-link-home {
    color: var(--accent);
    text-decoration: none;
}

.btn-link-home:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* Utilities */
.border-bottom {
    border-bottom: 1px solid var(--border-color);
}