:root {
    --bg: #0a0a0a;
    --fg: #e0e0e0;
    --muted: #555;
    --border: #2a2a2a;
    --border-light: #1a1a1a;
    --accent: #3a3a5a;
    --error: #e44;
    --link: #58a6ff;
    --indent: 24px;
}

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

body::-webkit-scrollbar {
    display: none;
}

body {
    font-family: "Fira Code", "Cascadia Code", "Consolas", monospace;
    background: var(--bg);
    color: var(--fg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    scrollbar-width: 0;
    -ms-overflow-style: none;
    line-height: 1.6;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-4px); }
    40%, 80% { transform: translateX(4px); }
}


header {
    display: flex;
    align-items: center;
    height: 48px;
    padding: 0 var(--indent);
    border-bottom: 1px solid var(--border);
    background: #060606;
}

.logo h2 {
    font-weight: 700;
    font-size: 14px;
    color: var(--fg);
    text-decoration: none;
    margin: 0;
}

header nav a {
    color: var(--link);
    text-decoration: none;
    font-size: 12px;
    transition: color 0.12s;
    margin-left: auto;
}

header nav a:hover {
    color: var(--fg);
}


main {
    max-width: 1300px;
    margin: 30px auto;
    padding: 0 var(--indent);
    width: 100%;
    flex: 1;
}

.hero {
    padding: 40px 0 32px;
    text-align: center;
}

.hero h1 {
    font-size: 32px;
    font-weight: 700;
    color: var(--fg);
    margin: 0 auto;
}


.editor-card {
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 24px;
}


.editor-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

@media (max-width: 768px) {
    .editor-layout {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

.editor-pane {
    display: flex;
    flex-direction: column;
    min-height: 500px;
}

.pane-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-light);
}

.pane-header span {
    font-weight: 600;
    color: var(--fg);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
}

.pane-header i {
    font-size: 0.9rem;
    color: var(--muted);
}


textarea {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 12px 14px;
    color: var(--fg);
    font-size: 14px;
    line-height: 1.7;
    resize: vertical;
    outline: none;
    font-family: "Fira Code", "Cascadia Code", "Consolas", monospace;
    transition: border-color 0.12s;
    flex: 1;
}

textarea:focus {
    border-color: var(--accent);
}


.preview-area {
    flex: 1;
    background: #060606;
    border: 1px solid var(--border);
    padding: 16px;
    overflow-y: auto;
    word-wrap: break-word;
    line-height: 1.6;
    font-family: -apple-system, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.preview-area img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1em auto;
}

.preview-area h1, .preview-area h2, .preview-area h3,
.preview-area h4, .preview-area h5, .preview-area h6 {
    margin-top: 1.2em;
    margin-bottom: 0.5em;
    font-weight: 600;
    color: var(--fg);
}

.preview-area h1 { font-size: 1.8rem; border-bottom: 1px solid var(--border-light); }
.preview-area h2 { font-size: 1.5rem; border-bottom: 1px solid var(--border-light); }
.preview-area h3 { font-size: 1.3rem; }
.preview-area p { margin: 0.8em 0; }
.preview-area ul, .preview-area ol { margin: 0.8em 0 0.8em 1.8em; }
.preview-area li { margin: 0.3em 0; }
.preview-area code {
    background: #1a1a1a;
    padding: 0.2em 0.4em;
    font-family: "Fira Code", monospace;
    font-size: 0.9em;
    color: var(--fg);
    border: 1px solid var(--border);
}
.preview-area pre {
    background: #0a0a0a;
    padding: 14px;
    overflow-x: auto;
    margin: 1em 0;
    border: 1px solid var(--border);
}
.preview-area pre code {
    background: transparent;
    padding: 0;
    font-size: 0.9rem;
    border: none;
}
.preview-area blockquote {
    border-left: 4px solid var(--accent);
    margin: 1em 0;
    padding-left: 1em;
    color: var(--muted);
    background: rgba(255,255,255,0.02);
}
.preview-area table {
    border-collapse: collapse;
    width: 100%;
    margin: 1em 0;
}
.preview-area th, .preview-area td {
    border: 1px solid var(--border-light);
    padding: 8px 12px;
    text-align: left;
}
.preview-area th {
    background: #060606;
    color: var(--muted);
}
.preview-area a {
    color: var(--link);
    text-decoration: underline;
}
.preview-area hr {
    border: none;
    height: 1px;
    background: var(--border-light);
    margin: 1.5em 0;
}


.action-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-light);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--fg);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.12s;
}

.btn:hover {
    border-color: var(--fg);
    color: var(--fg);
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--fg);
}

.btn-primary:hover {
    background: #4a4a7a;
    border-color: #4a4a7a;
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--muted);
}

.btn-secondary:hover {
    border-color: var(--fg);
    color: var(--fg);
}


.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--fg);
    color: var(--bg);
    padding: 8px 20px;
    font-size: 13px;
    font-family: inherit;
    border: 1px solid var(--border);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
    z-index: 1000;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    visibility: visible;
}


footer {
    border-top: 1px solid var(--border);
    padding: 16px var(--indent);
    font-size: 11px;
    color: var(--muted);
    text-align: center;
    background: #060606;
    margin-top: 50px;
    position: sticky;
    top: 100vh;
}


.preview-area::-webkit-scrollbar {
    width: 8px;
}
.preview-area::-webkit-scrollbar-track {
    background: rgba(0,0,0,0.2);
}
.preview-area::-webkit-scrollbar-thumb {
    background: var(--accent);
}


a {
    color: var(--link);
    text-decoration: none;
}


@media (max-width: 480px) {
    .hero h1 { font-size: 24px; }
    .editor-card { padding: 16px; }
    .btn { padding: 8px 14px; font-size: 12px; }
}