/* Notion-inspired dark theme */

:root {
    --bg: #191919;
    --bg-elevated: #1e1e1e;
    --bg-surface: #202020;
    --bg-hover: rgba(255, 255, 255, 0.06);
    --border: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.14);
    --shadow-deep: 0 22px 60px rgba(0, 0, 0, 0.45);

    --text-primary: rgba(255, 255, 255, 0.92);
    --text-secondary: rgba(255, 255, 255, 0.68);
    --text-muted: rgba(255, 255, 255, 0.44);
    --text-heading: rgba(255, 255, 255, 0.96);

    --accent: #4da3f0;
    --accent-hover: #3a8fdc;
    --accent-muted: rgba(77, 163, 240, 0.16);
    --accent-border: rgba(77, 163, 240, 0.3);
    --focus-ring: rgba(90, 172, 245, 0.28);

    --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

    --font-size-base: 16px;
    --font-size-sm: 14px;
    --font-size-xs: 12px;
    --line-height: 1.55;

    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    --sidebar-width: 280px;
    --content-width: 820px;
    --transition: 160ms ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 100%;
    background: var(--bg);
    scrollbar-gutter: stable;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    background: var(--bg);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

a {
    color: inherit;
}

button,
input,
textarea,
select {
    font: inherit;
}

::selection {
    background: rgba(77, 163, 240, 0.28);
    color: var(--text-heading);
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    height: 64px;
    display: flex;
    align-items: center;
    background: rgba(25, 25, 25, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.topbar-inner {
    width: 100%;
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 var(--space-4);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

.topbar-title {
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.01em;
    text-decoration: none;
    color: var(--text-heading);
}

.topbar-title:hover {
    color: var(--accent);
}

.topbar-nav {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.topbar-nav-link {
    display: inline-flex;
    align-items: center;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-decoration: none;
    color: var(--text-secondary);
    transition: background var(--transition), color var(--transition);
}

.topbar-nav-link:hover {
    color: var(--text-heading);
    background: var(--bg-hover);
}

.topbar-nav-link.active {
    color: var(--text-heading);
    background: var(--accent-muted);
}

.lang-toggle {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    padding: 2px;
    border-radius: 999px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
}

.lang-btn {
    border: 0;
    background: transparent;
    color: var(--text-muted);
    border-radius: 999px;
    padding: 6px 10px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
}

.lang-btn:hover {
    color: var(--text-heading);
    background: rgba(255, 255, 255, 0.05);
}

.lang-btn.active {
    background: rgba(255, 255, 255, 0.09);
    color: var(--text-heading);
}

.container {
    display: flex;
    min-height: calc(100vh - 64px);
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
}

.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    position: sticky;
    top: 64px;
    height: calc(100vh - 64px);
    padding: var(--space-6) var(--space-4);
    border-right: 1px solid var(--border);
    background: rgba(25, 25, 25, 0.4);
}

.sidebar-content {
    height: 100%;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.content {
    flex: 1;
    min-width: 0;
    padding: var(--space-8) 28px 56px;
    display: flex;
    justify-content: center;
}

#markdown-viewer {
    width: 100%;
    max-width: var(--content-width);
    font-size: var(--font-size-base);
    transition: opacity 0.15s ease;
}

#markdown-viewer.loading {
    opacity: 0.2;
    pointer-events: none;
}

#markdown-viewer.loading-shell {
    opacity: 1;
    pointer-events: none;
}

.plugin-selector {
    margin-bottom: var(--space-4);
}

.plugin-dropdown {
    position: relative;
}

.plugin-dropdown-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    padding: 9px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--bg-elevated);
    color: var(--text-heading);
    cursor: pointer;
    text-align: left;
    transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
}

.plugin-dropdown-btn:hover {
    background: var(--bg-surface);
    border-color: var(--border-strong);
}

.plugin-dropdown-btn[aria-expanded="true"] {
    border-color: var(--accent-border);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.plugin-dropdown-arrow {
    flex-shrink: 0;
    color: var(--text-muted);
    transition: transform var(--transition), color var(--transition);
}

.plugin-dropdown-btn[aria-expanded="true"] .plugin-dropdown-arrow {
    transform: rotate(180deg);
    color: var(--text-heading);
}

.plugin-dropdown-menu {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    right: 0;
    list-style: none;
    margin: 0;
    padding: 6px;
    border-radius: var(--radius-md);
    background: #222222;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-deep);
    z-index: 20;
    transform-origin: top center;
    transform: translateY(-4px) scale(0.98);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
}

.plugin-dropdown-menu.open {
    transform: translateY(0) scale(1);
    opacity: 1;
    pointer-events: auto;
}

.plugin-dropdown-menu li {
    margin: 0;
}

.plugin-dropdown-menu li a,
.plugin-dropdown-menu li button {
    display: block;
    width: 100%;
    padding: 8px 10px;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    text-align: left;
    text-decoration: none;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
}

.plugin-dropdown-menu li button:hover,
.plugin-dropdown-menu li a:hover {
    color: var(--text-heading);
    background: rgba(255, 255, 255, 0.06);
}

.plugin-dropdown-menu li.active button {
    color: var(--text-heading);
    background: var(--accent-muted);
}

.skeleton-line,
.skeleton-block {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.06);
}

.skeleton-line::after,
.skeleton-block::after {
    content: "";
    position: absolute;
    inset: 0;
    transform: translateX(-100%);
    background: linear-gradient(90deg,
            transparent 0%,
            rgba(255, 255, 255, 0.08) 45%,
            rgba(255, 255, 255, 0.16) 50%,
            rgba(255, 255, 255, 0.08) 55%,
            transparent 100%);
    animation: skeleton-shimmer 1.35s ease-in-out infinite;
}

.skeleton-line {
    height: 14px;
    margin-bottom: 10px;
}

.skeleton-line.short {
    width: 58%;
}

.skeleton-line.medium {
    width: 72%;
}

.skeleton-line.title {
    width: 46%;
    height: 34px;
    margin-bottom: 24px;
}

.skeleton-line.skeleton-pill {
    height: 34px;
    border-radius: 10px;
    margin-bottom: 6px;
}

.skeleton-block {
    height: 220px;
    margin: 28px 0 18px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.045);
}

.doc-skeleton {
    width: 100%;
    max-width: var(--content-width);
}

@keyframes skeleton-shimmer {
    100% {
        transform: translateX(100%);
    }
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

nav .nav-label {
    display: block;
    padding: 12px 10px 6px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
}

nav li a {
    display: block;
    padding: 8px 10px;
    border-radius: 6px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: background var(--transition), color var(--transition);
}

nav li a:hover {
    color: var(--text-heading);
    background: rgba(255, 255, 255, 0.06);
}

nav li.active a {
    color: var(--text-heading);
    background: var(--accent-muted);
}

#markdown-viewer h1,
#markdown-viewer h2,
#markdown-viewer h3,
#markdown-viewer h4,
#markdown-viewer h5,
#markdown-viewer h6 {
    color: var(--text-heading);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.03em;
    margin: 2.2em 0 0.55em;
}

#markdown-viewer h1 {
    font-size: clamp(2rem, 4vw, 3.25rem);
    margin-top: 0;
}

#markdown-viewer h2 {
    font-size: clamp(1.5rem, 2.4vw, 2rem);
}

#markdown-viewer h3 {
    font-size: 1.35rem;
}

#markdown-viewer h4 {
    font-size: 1.1rem;
}

#markdown-viewer p {
    margin: 0 0 1rem;
    color: var(--text-primary);
}

#markdown-viewer em {
    color: var(--text-muted);
    font-style: normal;
}

#markdown-viewer a {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-color: rgba(77, 163, 240, 0.35);
    text-underline-offset: 0.12em;
    transition: color var(--transition), text-decoration-color var(--transition);
}

#markdown-viewer a:hover {
    color: var(--accent-hover);
    text-decoration-color: var(--accent-hover);
}

#markdown-viewer ul,
#markdown-viewer ol {
    margin: 0 0 1rem;
    padding-left: 1.4rem;
}

#markdown-viewer li {
    margin-bottom: 0.45rem;
}

pre {
    margin: 0 0 1rem;
    padding: 16px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: #141414;
    overflow-x: auto;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.02);
}

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-heading);
    padding: 0.15em 0.38em;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

pre code {
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

blockquote {
    margin: 1.5rem 0;
    padding: 16px;
    border-left: 3px solid var(--accent);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    background: rgba(77, 163, 240, 0.08);
    color: var(--text-secondary);
}

#markdown-viewer blockquote p {
    margin: 0;
}

hr {
    border: 0;
    height: 1px;
    margin: 2rem 0;
    background: var(--border);
}

#markdown-viewer img {
    display: inline-block;
    max-width: 100%;
    margin: 0.25rem 0.25rem 0 0;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-strong);
    background: rgba(255, 255, 255, 0.03);
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.03),
        0 10px 24px rgba(0, 0, 0, 0.22);
}

#markdown-viewer img.profile-img {
    width: 300px;
    float: left;
    margin: 0 40px 20px 0;
}

#markdown-viewer .image-card {
    margin: 0 0 0.55rem;
    width: fit-content;
    max-width: 100%;
    text-align: center;
}

#markdown-viewer .image-card > img.image-card-image {
    display: block;
    max-width: 100%;
    margin: 0 auto;
    border-color: rgba(255, 255, 255, 0.12);
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.04),
        0 12px 28px rgba(0, 0, 0, 0.24);
}

#markdown-viewer .image-card-caption {
    margin-top: 0.45rem;
    padding: 0 4px;
    font-size: var(--font-size-xs);
    line-height: 1.45;
    color: var(--text-muted);
}

#markdown-viewer .image-card-caption em {
    color: inherit;
    font-style: normal;
}

#markdown-viewer .image-card-caption strong {
    color: var(--text-secondary);
}

#markdown-viewer img[alt*="w-100"] {
    width: 100px !important;
}

#markdown-viewer img[alt*="w-150"] {
    width: 150px !important;
}

#markdown-viewer img[alt*="w-200"] {
    width: 200px !important;
}

#markdown-viewer img[alt*="w-300"] {
    width: 300px !important;
}

#markdown-viewer img[alt*="w-400"] {
    width: 400px !important;
}

#markdown-viewer img[alt*="w-500"] {
    width: 500px !important;
}

#markdown-viewer img[alt*="w-600"] {
    width: 600px !important;
}

#markdown-viewer img[alt*="w-800"] {
    width: 800px !important;
}

#markdown-viewer img[alt*="w-1000"] {
    width: 1000px !important;
}

#markdown-viewer img[alt*="w-1200"] {
    width: 1200px !important;
}

#markdown-viewer img[alt*="w-full"] {
    width: 100% !important;
}

#markdown-viewer img[alt*="w-icon"] {
    width: 48px !important;
    height: 48px !important;
    border: 0;
    border-radius: 0;
    margin: 0;
    vertical-align: -16%;
}

#markdown-viewer table {
    width: 100%;
    margin: 0 0 1rem;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

#markdown-viewer th,
#markdown-viewer td {
    padding: 12px 14px;
    text-align: left;
    vertical-align: top;
    word-break: keep-all;
    overflow-wrap: break-word;
    border-bottom: 1px solid var(--border);
}

#markdown-viewer th {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-heading);
    font-weight: 600;
}

#markdown-viewer tr:last-child td {
    border-bottom: 0;
}

#markdown-viewer button {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    margin: 4px 8px 4px 0;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    color: var(--text-primary);
    cursor: pointer;
    text-decoration: none;
    transition: background var(--transition), border-color var(--transition), color var(--transition);
}

#markdown-viewer button:hover {
    background: var(--bg-surface);
    border-color: var(--accent-border);
    color: var(--text-heading);
}

#markdown-viewer a button,
#markdown-viewer a:hover button {
    color: inherit;
    text-decoration: none;
}

.warning-box {
    display: inline-block;
    margin: 0.5rem 0;
    padding: 8px 12px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(240, 112, 32, 0.35);
    background: rgba(240, 112, 32, 0.12);
    color: #ffb07a;
    font-weight: 600;
    font-size: var(--font-size-sm);
}

#markdown-viewer iframe#kofiframe {
    display: block;
    margin: var(--space-6) 0;
    width: 100%;
    max-width: 500px;
    border: none;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: #fff;
    box-shadow: var(--shadow-deep);
}

@media (max-width: 1024px) {
    .container {
        flex-direction: column;
    }

    .sidebar {
        position: relative;
        top: auto;
        width: 100%;
        height: auto;
        border-right: 0;
        border-bottom: 1px solid var(--border);
    }

    .content {
        padding: 28px 22px 44px;
    }
}

@media (max-width: 720px) {
    .topbar {
        height: auto;
        padding: 10px 0;
    }

    .topbar-inner {
        flex-wrap: wrap;
    }

    .topbar-nav {
        order: 3;
        width: 100%;
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 2px;
    }

    .lang-toggle {
        margin-left: auto;
    }

    .sidebar {
        padding: 18px 16px;
    }

    .content {
        padding: 24px 16px 40px;
    }

    #markdown-viewer h1 {
        font-size: 1.9rem;
    }

    #markdown-viewer img.profile-img {
        float: none;
        display: block;
        margin: 0 auto 24px;
        width: 100%;
        max-width: 300px;
    }
}