:root {
    --bg-color: #050510;
    --accent-color: #6366f1;
    --accent-glow: rgba(99, 102, 241, 0.45);
    --accent-hover: #4f46e5;
    --emerald: #10b981;
    --emerald-glow: rgba(16, 185, 129, 0.4);
    --rose: #f43f5e;
    --amber: #f59e0b;
    --glass-bg: rgba(255, 255, 255, 0.035);
    --glass-card: rgba(255, 255, 255, 0.045);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-border-focus: rgba(99, 102, 241, 0.6);
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Outfit', sans-serif;
    --font-code: 'Fira Code', monospace;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.5;
    position: relative;
}

/* Background Blobs */
.background-blobs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    filter: blur(85px);
    pointer-events: none;
}

.blob {
    position: absolute;
    border-radius: 50%;
    opacity: 0.45;
    animation: move 20s infinite alternate ease-in-out;
}

.blob-1 {
    width: 450px;
    height: 450px;
    background: #4f46e5;
    top: -100px;
    left: -100px;
}

.blob-2 {
    width: 500px;
    height: 500px;
    background: #7c3aed;
    bottom: -150px;
    right: -120px;
    animation-delay: -5s;
}

.blob-3 {
    width: 350px;
    height: 350px;
    background: #db2777;
    top: 45%;
    left: 50%;
    animation-delay: -10s;
}

@keyframes move {
    from { transform: translate(0, 0); }
    to { transform: translate(70px, 80px); }
}

/* App Layout */
.app-layout {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem 2rem 3rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    min-height: 100vh;
}

/* Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding-bottom: 0.5rem;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.5rem 0.9rem;
    border-radius: 12px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    transition: all 0.2s ease;
}

.back-link svg {
    width: 16px;
    height: 16px;
    transition: transform 0.2s ease;
}

.back-link:hover {
    color: var(--text-primary);
    border-color: var(--accent-color);
    background: rgba(99, 102, 241, 0.12);
}

.back-link:hover svg {
    transform: translateX(-3px);
}

.brand-title {
    text-align: center;
}

.logo {
    font-family: var(--font-display);
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--accent-color);
    text-shadow: 0 0 20px var(--accent-glow);
}

.logo-sub {
    display: block;
    font-size: 0.82rem;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
    margin-top: -2px;
}

.header-spacer {
    width: 135px;
}

@media (max-width: 600px) {
    .header-spacer {
        display: none;
    }
}

/* Glass Panels */
.glass-panel {
    background: var(--glass-card);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    box-shadow: 0 10px 32px rgba(0, 0, 0, 0.35);
}

/* Main Content */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Toolbar */
.toolbar {
    padding: 0.75rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.85rem;
}

.toolbar-section {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.btn-group {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.toolbar-divider {
    width: 1px;
    height: 22px;
    background: var(--glass-border);
    margin: 0 0.25rem;
}

.tool-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 0.45rem 0.75rem;
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
}

.tool-btn svg {
    width: 14px;
    height: 14px;
}

.tool-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.25);
    transform: translateY(-1px);
}

.tool-btn.primary {
    background: var(--accent-color);
    border-color: var(--accent-color);
    box-shadow: 0 2px 12px var(--accent-glow);
}

.tool-btn.primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 18px var(--accent-glow);
}

.styled-select {
    padding: 0.45rem 0.85rem;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.82rem;
    font-weight: 500;
    outline: none;
    cursor: pointer;
}

.styled-select option {
    background: #0d0e1f;
    color: #ffffff;
}

/* Split Stage */
.split-stage {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    min-height: 600px;
}

.stage-pane {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: 620px;
}

.pane-header {
    padding: 0.75rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(0, 0, 0, 0.2);
}

.pane-title {
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-secondary);
}

.pane-badge {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--accent-color);
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    padding: 0.15rem 0.55rem;
    border-radius: 999px;
}

.mini-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 0.25rem 0.55rem;
    border-radius: 6px;
    font-size: 0.75rem;
    cursor: pointer;
}

.mini-btn.danger:hover {
    color: var(--rose);
    border-color: var(--rose);
}

/* Markdown Input Textarea */
#markdown-input {
    flex: 1;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.25);
    border: none;
    padding: 1.5rem;
    color: var(--text-primary);
    font-family: var(--font-code);
    font-size: 0.95rem;
    line-height: 1.7;
    resize: none;
    outline: none;
    tab-size: 2;
}

/* Markdown Rendered Preview */
.markdown-preview {
    flex: 1;
    padding: 1.75rem;
    overflow-y: auto;
    font-family: var(--font-main);
    color: #e2e8f0;
    line-height: 1.75;
}

/* GFM Elements Styling */
.markdown-preview h1,
.markdown-preview h2,
.markdown-preview h3,
.markdown-preview h4 {
    color: #ffffff;
    font-family: var(--font-display);
    font-weight: 700;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.markdown-preview h1 {
    font-size: 2rem;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 0.4rem;
}

.markdown-preview h2 {
    font-size: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 0.3rem;
}

.markdown-preview h3 { font-size: 1.25rem; }

.markdown-preview p {
    margin-bottom: 1rem;
}

.markdown-preview a {
    color: #818cf8;
    text-decoration: underline;
}

.markdown-preview blockquote {
    border-left: 4px solid var(--accent-color);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--text-secondary);
    font-style: italic;
    background: rgba(99, 102, 241, 0.05);
    border-radius: 0 8px 8px 0;
    padding: 0.75rem 1rem;
}

.markdown-preview code {
    background: rgba(255, 255, 255, 0.08);
    color: #f43f5e;
    font-family: var(--font-code);
    padding: 0.2rem 0.4rem;
    border-radius: 6px;
    font-size: 0.88em;
}

.markdown-preview pre {
    background: #0d0f1f;
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.25rem;
    overflow-x: auto;
    margin: 1.25rem 0;
}

.markdown-preview pre code {
    background: none;
    color: #e2e8f0;
    padding: 0;
    font-size: 0.9em;
}

.markdown-preview table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.25rem 0;
}

.markdown-preview th,
.markdown-preview td {
    border: 1px solid var(--glass-border);
    padding: 0.65rem 1rem;
    text-align: left;
}

.markdown-preview th {
    background: rgba(255, 255, 255, 0.05);
    font-weight: 600;
}

.markdown-preview tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}

.markdown-preview ul,
.markdown-preview ol {
    margin: 0.75rem 0 1rem 1.5rem;
}

.markdown-preview li {
    margin-bottom: 0.35rem;
}

.markdown-preview input[type="checkbox"] {
    margin-right: 0.5rem;
}

.markdown-preview hr {
    border: none;
    border-top: 1px solid var(--glass-border);
    margin: 2rem 0;
}

/* Stats Bar */
.stats-bar {
    padding: 0.65rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.stat-pill {
    font-variant-numeric: tabular-nums;
}

/* AdSense Section */
.adsense-container {
    margin-top: 1rem;
    width: 100%;
    display: flex;
    justify-content: center;
}

.ad-placeholder {
    width: 100%;
    min-height: 90px;
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.ad-label {
    position: absolute;
    top: 6px;
    left: 14px;
    font-size: 0.62rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    opacity: 0.55;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(15, 23, 42, 0.95);
    border: 1px solid var(--glass-border-focus);
    color: #ffffff;
    padding: 0.75rem 1.5rem;
    border-radius: 999px;
    font-size: 0.88rem;
    font-weight: 500;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    z-index: 10000;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.hidden {
    display: none !important;
}

/* Print PDF Stylesheet */
@media print {
    body {
        background: #ffffff !important;
        color: #000000 !important;
    }
    .background-blobs,
    .app-header,
    .toolbar,
    .adsense-container,
    .pane-header,
    #markdown-input,
    .stats-bar,
    .stage-pane:first-child {
        display: none !important;
    }
    .split-stage {
        display: block !important;
    }
    .stage-pane {
        border: none !important;
        background: none !important;
        box-shadow: none !important;
        height: auto !important;
    }
    .markdown-preview {
        color: #000000 !important;
        padding: 0 !important;
    }
    .markdown-preview h1,
    .markdown-preview h2,
    .markdown-preview h3 {
        color: #000000 !important;
        border-color: #cccccc !important;
    }
    .markdown-preview blockquote {
        border-color: #6366f1 !important;
        color: #333333 !important;
        background: #f8fafc !important;
    }
    .markdown-preview pre {
        background: #f1f5f9 !important;
        border: 1px solid #e2e8f0 !important;
    }
    .markdown-preview pre code {
        color: #0f172a !important;
    }
    .markdown-preview table th,
    .markdown-preview table td {
        border-color: #cbd5e1 !important;
    }
}

/* Responsive */
@media (max-width: 900px) {
    .split-stage {
        grid-template-columns: 1fr;
    }
    .stage-pane {
        height: 480px;
    }
    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    .toolbar-section {
        justify-content: center;
    }
}