:root {
    --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --text-main: #1f2937;
    --text-secondary: #4b5563;
    --font-sans: 'Inter', 'Noto Sans SC', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg-gradient);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    padding: 1rem;
    gap: 1rem;
}

/* Header & Toolbar */
.glass-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 1.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--glass-shadow);
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toolbar {
    display: flex;
    gap: 0.8rem;
}

.tool-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 8px;
    font-family: var(--font-sans);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    background: rgba(255, 255, 255, 0.5);
    color: var(--text-secondary);
}

.tool-btn:hover {
    background: rgba(255, 255, 255, 0.8);
    transform: translateY(-1px);
}

.tool-btn.primary {
    background: var(--primary-color);
    color: white;
}

.tool-btn.primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

/* Main Workspace */
.editor-workspace {
    display: flex;
    flex: 1;
    gap: 1rem;
    min-height: 0; /* Important for nested flex scrolling */
}

.pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--glass-shadow);
    overflow: hidden;
}

.pane-header {
    padding: 0.8rem 1.2rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.3);
}

/* Editor */
#markdown-input {
    flex: 1;
    width: 100%;
    padding: 1.5rem;
    border: none;
    resize: none;
    background: transparent;
    font-family: var(--font-mono);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-main);
    outline: none;
}

/* Preview */
#markdown-preview {
    flex: 1;
    padding: 2rem; /* Increased padding for better export look */
    overflow-y: auto;
    background: white; /* White bg for accurate preview/export */
}

/* Markdown Styles (Simplified GitHub-like) */
.markdown-body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: #24292e;
}

.markdown-body h1, .markdown-body h2, .markdown-body h3 {
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
    line-height: 1.25;
}

.markdown-body h1 { font-size: 2em; border-bottom: 1px solid #eaecef; padding-bottom: 0.3em; }
.markdown-body h2 { font-size: 1.5em; border-bottom: 1px solid #eaecef; padding-bottom: 0.3em; }
.markdown-body p { margin-bottom: 1rem; }
.markdown-body code {
    background-color: rgba(27, 31, 35, 0.05);
    border-radius: 3px;
    font-family: var(--font-mono);
    padding: 0.2em 0.4em;
    font-size: 85%;
}
.markdown-body pre {
    background-color: #f6f8fa;
    border-radius: 6px;
    padding: 16px;
    overflow: auto;
    margin-bottom: 1rem;
}
.markdown-body pre code {
    background: transparent;
    padding: 0;
}
.markdown-body blockquote {
    padding: 0 1em;
    color: #6a737d;
    border-left: 0.25em solid #dfe2e5;
    margin-bottom: 1rem;
}
.markdown-body img {
    max-width: 100%;
    box-sizing: content-box;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.markdown-body ul, .markdown-body ol {
    padding-left: 2em;
    margin-bottom: 1rem;
}
.markdown-body a {
    color: var(--primary-color);
    text-decoration: none;
}
.markdown-body a:hover {
    text-decoration: underline;
}
.markdown-body table {
    border-collapse: collapse;
    width: 100%;
    margin-bottom: 1rem;
}
.markdown-body table th, .markdown-body table td {
    border: 1px solid #dfe2e5;
    padding: 6px 13px;
}
.markdown-body table tr:nth-child(2n) {
    background-color: #f6f8fa;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.2);
}