:root {
    --bg: #0b0e14;
    --panel: #0f141c;
    --muted: #a0a7b4;
    --text: #e6e8eb;
    --border: #1b2230;
    --accent: #4ea1ff;
    --accent-weak: #264a79;
    --gap: 1rem;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial;
    line-height: 1.45;
}

header {
    padding: 0.9rem var(--gap);
    border-bottom: 1px solid var(--border);
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 0.75rem 1rem;

    position: sticky;
    top: 0;
    z-index: 1000;
    /* keep above other content */
    background: var(--bg);
    /* ensure it doesn’t become transparent when scrolling */
}

.title {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.2rem 0.6rem;
    border: 1px solid var(--border);
    background: var(--panel);
    color: var(--muted);
    border-radius: 999px;
    font-size: 0.8rem;
    text-decoration: none;
}

.badge:hover {
    box-shadow: 0 0 0 3px rgba(78, 161, 255, 0.12) inset;
    border-color: var(--accent);
}

.badge.loading {
    pointer-events: none;
    /* non-clickable, but looks normal */
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--accent-weak);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

#status {
    color: var(--muted);
    font-size: 0.9rem;
    justify-self: end;
}

.layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--gap);
    padding: var(--gap);
}

.pane {
    min-height: calc(100vh - 92px);
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--panel);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.pane-header {
    margin: 0;
    padding: 0.7rem 0.9rem;
    border-bottom: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.95rem;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.pane-header label {
    font-weight: normal;
    font-size: 0.85rem;
    color: var(--muted);
}

textarea {
    width: 100%;
    height: 100%;
    border: 0;
    padding: 0.9rem;
    resize: none;
    outline: none;
    color: var(--text);
    background: transparent;
    font: 14px/1.5 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    tab-size: 2;
}

#preview {
    padding: 0.9rem 1rem 2rem;
}

#preview h1,
#preview h2,
#preview h3 {
    margin: 1.2rem 0 0.5rem;
}

#preview a {
    color: var(--accent);
}

#preview pre {
    padding: 1rem 0.8rem;
    word-break: break-word;
}

#preview code {
    font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

#preview blockquote {
    margin: 1rem 0;
    padding-left: 1rem;
    border-left: 4px solid var(--accent-weak);
    color: #c2c7d0;
}

@media (max-width: 900px) {
    .layout {
        grid-template-columns: 1fr;
    }
}

/* Editor scrollbar — match code block styling */
#editor {
    /* Firefox */
    scrollbar-width: thin;
    scrollbar-color: var(--accent-weak) transparent;
}

/* Chrome/Edge/Safari */
#editor::-webkit-scrollbar {
    width: 8px;
    /* vertical */
    height: 8px;
    /* if horizontal shows up */
}

#editor::-webkit-scrollbar-track {
    background: transparent;
}

#editor::-webkit-scrollbar-thumb {
    background: var(--accent-weak);
    /* #264a79 */
    border-radius: 999px;
    border: 2px solid transparent;
    /* pill effect */
    background-clip: padding-box;
}

#editor:hover::-webkit-scrollbar-thumb {
    background: var(--accent);
    /* #4ea1ff on hover */
}

#editor::-webkit-scrollbar-corner {
    background: transparent;
}

/* No arrows/buttons */
#editor::-webkit-scrollbar-button {
    width: 0;
    height: 0;
    display: none;
}

/* Global page scrollbar styling */
html, body {
    scrollbar-width: thin; /* Firefox */
    scrollbar-color: var(--accent-weak) transparent;
}

/* Chrome/Edge/Safari */
html::-webkit-scrollbar,
body::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

html::-webkit-scrollbar-track,
body::-webkit-scrollbar-track {
    background: transparent;
}

html::-webkit-scrollbar-thumb,
body::-webkit-scrollbar-thumb {
    background: var(--accent-weak);
    border-radius: 999px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

html::-webkit-scrollbar-thumb:hover,
body::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

html::-webkit-scrollbar-corner,
body::-webkit-scrollbar-corner {
    background: transparent;
}

html::-webkit-scrollbar-button,
body::-webkit-scrollbar-button {
    width: 0;
    height: 0;
    display: none;
}