:root {
    --bg-color: #050505;
    --pane-bg: #0f0f12;
    --header-bg: rgba(10, 10, 12, 0.8);
    --border-color: #1f1f23;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --error-color: #ef4444;
    --success-color: #10b981;
    --glass-blur: 12px;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
header {
    height: 60px;
    background: var(--header-bg);
    backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 100;
}

.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon { color: var(--accent-color); width: 24px; height: 24px; }
.logo h1 { font-size: 18px; font-weight: 800; letter-spacing: -0.5px; }
.logo h1 span { color: var(--accent-color); }

.actions { display: flex; gap: 10px; }

.primary-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 13px;
}

.primary-btn:hover { background-color: var(--accent-hover); transform: translateY(-1px); }

.secondary-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 8px;
    border-radius: 8px;
    cursor: pointer;
}

/* Main Content */
main {
    flex: 1;
    display: flex;
    overflow: hidden;
    padding: 12px;
    gap: 12px;
}

.editor-pane, .preview-pane {
    flex: 1;
    background: var(--pane-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.pane-header {
    height: 40px;
    padding: 0 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255,255,255,0.02);
    border-bottom: 1px solid var(--border-color);
}

.pane-title { font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: 1px; color: var(--text-dim); }

#monaco-editor { flex: 1; height: 100%; }

/* Preview Content */
.preview-content { flex: 1; position: relative; background: #000; display: flex; flex-direction: column; }
#pdf-viewer { width: 100%; height: 100%; border: none; background: white; }

#empty-state {
    flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; color: var(--text-secondary); gap: 12px;
}
.empty-icon { width: 40px; height: 40px; opacity: 0.2; }

/* Status Bar */
footer { height: 28px; background: #0a0a0c; border-top: 1px solid var(--border-color); padding: 0 16px; }
.status-bar { height: 100%; display: flex; align-items: center; justify-content: space-between; font-size: 10px; font-weight: 600; color: var(--text-secondary); }
.ready { color: var(--success-color); }

.status-dot { width: 8px; height: 8px; border-radius: 50%; background: #333; }
.status-dot.success { background: var(--success-color); box-shadow: 0 0 8px var(--success-color); }
.status-dot.error { background: var(--error-color); box-shadow: 0 0 8px var(--error-color); }

/* Loader & Error */
#loader { position: absolute; inset: 0; background: rgba(0,0,0,0.8); display: flex; flex-direction: column; align-items: center; justify-content: center; z-index: 10; gap: 12px; }
.spinner { width: 30px; height: 30px; border: 3px solid rgba(59, 130, 246, 0.2); border-top-color: var(--accent-color); border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

#error-console { position: absolute; bottom: 0; left: 0; right: 0; background: #1a0a0a; border-top: 2px solid var(--error-color); padding: 16px; max-height: 40%; overflow-y: auto; z-index: 20; }
.error-header { display: flex; align-items: center; gap: 8px; color: var(--error-color); font-weight: 700; font-size: 12px; margin-bottom: 8px; }
#error-log { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: #fecaca; white-space: pre-wrap; }

.hidden { display: none !important; }
.icon-btn { background: transparent; border: none; color: var(--text-secondary); cursor: pointer; padding: 4px; border-radius: 4px; display: flex; align-items: center; }
.icon-btn:hover { color: var(--accent-color); background: rgba(255,255,255,0.05); }