:root {
    --bg: #fafaf9;
    --fg: #27272a;
    --accent: #dc67e6;
    --accent-light: #f3e7f9;
    --accent-dark: #9d2fb8;
    --muted: #71717a;
    --surface: #f4f4f5;
    --border: #e7d0f0;
    --primary-red: #7f1d1d;
    --primary-green: #059669;
    --primary-blue: #0ea5e9;
    --primary-gold: #f59e0b;
    --font-family: "Charter", "Georgia", serif;
}

body.dark-mode {
    --bg: #0d0d0d;
    --fg: #e0ddd5;
    --accent: #dc67e6;
    --accent-light: #2d1838;
    --accent-dark: #ff8cff;
    --muted: #a89968;
    --surface: #1a1917;
    --border: #5d2570;
}

body.font-sans {
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", sans-serif;
}

body.font-mono {
    --font-family: "JetBrains Mono", "Fira Code", "Courier New", monospace;
}

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

body {
    font-family: var(--font-family);
    background: var(--bg);
    color: var(--fg);
    line-height: 1.7;
    min-height: 100vh;
    transition: background-color 0.15s, color 0.15s;
}

/* loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.3s, visibility 0.3s;
}

.loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--accent-light);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* nav lateral */
.layout {
    display: flex;
    min-height: 100vh;
}

nav {
    width: 280px;
    min-width: 280px;
    border-right: 2px solid var(--accent);
    padding: 2rem 1.5rem;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

nav h1 {
    font-size: 1.1rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.3rem;
}

nav .subtitle {
    font-size: 0.8rem;
    color: var(--muted);
    margin-bottom: 2rem;
}

nav ul {
    list-style: none;
}

nav li {
    margin-bottom: 0.4rem;
}

nav a {
    color: var(--fg);
    text-decoration: none;
    font-size: 0.9rem;
    display: block;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    transition: all 0.15s;
    border-left: 2px solid transparent;
    padding-left: 0.4rem;
}

nav a:hover {
    background: var(--accent-light);
    color: var(--accent);
    border-left-color: var(--accent);
}

nav a.active {
    background: var(--accent-light);
    color: var(--accent);
    font-weight: 600;
    border-left-color: var(--accent);
}

nav .loading {
    color: var(--muted);
    font-size: 0.85rem;
    font-style: italic;
}

.theme-toggle {
    margin-top: 1rem;
    display: flex;
    gap: 0.5rem;
}

.theme-toggle button {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--fg);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.15s;
}

.theme-toggle button:hover {
    border-color: var(--accent);
}

.theme-toggle button.active {
    background: var(--accent);
    color: #fff;
    font-weight: 600;
}

.font-selector {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.font-selector label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted);
    margin-bottom: 0.3rem;
}

.font-selector-buttons {
    display: flex;
    gap: 0.3rem;
}

.font-selector-buttons button {
    flex: 1;
    padding: 0.4rem;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--fg);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.75rem;
    transition: all 0.15s;
}

.font-selector-buttons button:hover {
    border-color: var(--accent);
}

.font-selector-buttons button.active {
    background: var(--accent);
    color: #fff;
    font-weight: 600;
}

.social-links {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px solid var(--accent);
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.45rem 0.6rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--surface);
    color: var(--muted);
    font-size: 0.8rem;
    text-decoration: none;
    transition: all 0.15s;
}

.social-link svg {
    width: 1rem;
    height: 1rem;
    flex-shrink: 0;
}

.social-link:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.font-serif {
    font-family: "Charter", "Georgia", serif;
}

.font-sans {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.font-mono {
    font-family: "JetBrains Mono", "Fira Code", monospace;
}

/* conteudo */
main {
    flex: 1;
    max-width: 52rem;
    padding: 3rem 3rem 6rem;
}

.index-view {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.index-view img {
    max-width: 100%;
    width: 100%;
    margin-bottom: 2rem;
    border-radius: 12px;
}

.index-view h2 {
    font-size: 1.6rem;
    color: var(--accent);
    margin-bottom: 1rem;
}

.index-view p {
    color: var(--muted);
    margin-bottom: 2rem;
}

/* markdown renderizado */
.md h1 {
    font-size: 1.8rem;
    color: var(--accent);
    margin: 2rem 0 1rem;
}
.md h2 {
    font-size: 1.4rem;
    color: var(--accent);
    margin: 2.5rem 0 0.8rem;
    border-bottom: 2px solid var(--accent);
    padding-bottom: 0.4rem;
}
.md h3 {
    font-size: 1.15rem;
    color: var(--accent-dark);
    margin: 1.8rem 0 0.6rem;
    border-left: 2px solid var(--accent);
    padding-left: 0.8rem;
}
.md p {
    margin-bottom: 1rem;
    text-align: justify;
}
.md blockquote {
    border-left: 4px solid var(--accent);
    padding: 0.5rem 1.2rem;
    margin: 1.2rem 0;
    background: var(--accent-light);
    color: var(--fg);
    font-style: italic;
    border-radius: 0 4px 4px 0;
}
.md blockquote p {
    margin-bottom: 0.4rem;
}
.md ul,
.md ol {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}
.md li {
    margin-bottom: 0.3rem;
}
.md strong {
    color: var(--accent);
    font-weight: 700;
}
.md em {
    font-style: italic;
}
.md a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 2px;
    transition: all 0.15s;
}
.md a:hover {
    color: var(--accent-dark);
    background: var(--accent-light);
    text-decoration: none;
}
.md code {
    font-family: "JetBrains Mono", "Fira Code", monospace;
    font-size: 0.85em;
    background: var(--surface);
    padding: 0.15em 0.4em;
    border-radius: 3px;
}
.md pre {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1rem 1.2rem;
    overflow-x: auto;
    margin: 1.2rem 0;
}
.md pre code {
    background: none;
    padding: 0;
}
.md table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.2rem 0;
    font-size: 0.9rem;
}
.md th,
.md td {
    border: 1px solid var(--border);
    padding: 0.5rem 0.8rem;
    text-align: left;
}
.md th {
    background: var(--accent-light);
    color: var(--accent);
    font-weight: 600;
}
.md hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2rem 0;
}
.md img {
    max-width: 100%;
    border-radius: 6px;
}

/* separador do ensaio */
.md p:has(> br):empty,
.md p:only-child {
}

/* mobile */
@media (max-width: 768px) {
    .layout {
        flex-direction: column;
    }
    nav {
        width: 100%;
        min-width: unset;
        position: static;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding: 1.5rem 1rem;
    }
    main {
        padding: 2rem 1.2rem 4rem;
    }
}

/* mermaid diagrams */
.mermaid-diagram {
    margin: 2rem 0;
    padding: 1.2rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.mermaid-description {
    font-size: 0.9rem;
    color: var(--muted);
    margin-bottom: 1rem;
    text-align: center;
    font-style: italic;
    max-width: 100%;
}

.mermaid-diagram .mermaid {
    max-width: 100%;
    overflow-x: auto;
}

/* mermaid dark mode adjustments */
body.dark-mode .mermaid-diagram .mermaid svg {
    filter: brightness(0.9);
}