:root {
    --bg: #0d0f12;
    --bg2: #14171c;
    --glass: rgba(20, 23, 28, .9);
    --text: #fff;
    --text2: #7a8a9a;
    --accent: #8b5cf6;
    --accent2: #a78bfa;
    --gradient: linear-gradient(135deg, #8b5cf6, #a78bfa);
    --border: rgba(255, 255, 255, .08);
    --radius: 14px
}

[data-theme=light] {
    --bg: #f5f3ff;
    --bg2: #fff;
    --glass: rgba(255, 255, 255, .95);
    --text: #1e1b4b;
    --text2: #64748b;
    --border: rgba(0, 0, 0, .1)
}

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

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

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

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: var(--glass);
    border-bottom: 1px solid var(--border)
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem
}

.logo h1 {
    font-size: 1.3rem;
    font-weight: 400
}

.logo h1 span {
    font-weight: 700;
    color: var(--accent)
}

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

#theme-btn {
    width: 40px;
    height: 40px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    cursor: pointer
}

.download-btn {
    padding: 10px 20px;
    background: var(--gradient);
    border: none;
    border-radius: 10px;
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    transition: .2s
}

.download-btn:hover {
    transform: scale(1.05)
}

.editor-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    flex: 1;
    overflow: hidden
}

.editor-panel,
.preview-panel {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 140px)
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: var(--glass);
    border-bottom: 1px solid var(--border)
}

.panel-header h3 {
    font-size: .9rem
}

.editor-actions {
    display: flex;
    gap: 8px
}

.small-btn {
    padding: 6px 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text2);
    font-size: .8rem;
    cursor: pointer
}

.small-btn:hover {
    border-color: var(--accent);
    color: var(--text)
}

#markdown-input {
    flex: 1;
    padding: 20px;
    background: var(--bg2);
    border: none;
    color: var(--text);
    font-family: 'JetBrains Mono', monospace;
    font-size: .9rem;
    line-height: 1.7;
    resize: none
}

#markdown-input:focus {
    outline: none
}

.style-picker {
    display: flex;
    gap: 6px
}

.style-btn {
    padding: 6px 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text2);
    font-size: .75rem;
    cursor: pointer
}

.style-btn:hover {
    border-color: var(--accent)
}

.style-btn.active {
    background: var(--gradient);
    color: #fff;
    border-color: transparent
}

.preview-container {
    flex: 1;
    overflow-y: auto;
    padding: 30px;
    background: #fff
}

.markdown-preview {
    max-width: 800px;
    margin: 0 auto;
    color: #1a1a2e;
    font-size: 14px;
    line-height: 1.8
}

.markdown-preview h1 {
    font-size: 2em;
    border-bottom: 2px solid #e5e7eb;
    padding-bottom: .5em;
    margin: 1em 0 .5em
}

.markdown-preview h2 {
    font-size: 1.5em;
    border-bottom: 1px solid #e5e7eb;
    padding-bottom: .3em;
    margin: 1em 0 .5em
}

.markdown-preview h3 {
    font-size: 1.25em;
    margin: 1em 0 .5em
}

.markdown-preview p {
    margin: 1em 0
}

.markdown-preview ul,
.markdown-preview ol {
    margin: 1em 0;
    padding-left: 2em
}

.markdown-preview li {
    margin: .5em 0
}

.markdown-preview code {
    background: #f3f4f6;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: .9em
}

.markdown-preview pre {
    background: #1e1e2e;
    color: #e5e7eb;
    padding: 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1em 0
}

.markdown-preview pre code {
    background: none;
    padding: 0;
    color: inherit
}

.markdown-preview blockquote {
    border-left: 4px solid var(--accent);
    padding-left: 16px;
    margin: 1em 0;
    color: #6b7280;
    font-style: italic
}

.markdown-preview a {
    color: var(--accent)
}

.markdown-preview hr {
    border: none;
    border-top: 2px solid #e5e7eb;
    margin: 2em 0
}

.markdown-preview table {
    width: 100%;
    border-collapse: collapse;
    margin: 1em 0
}

.markdown-preview th,
.markdown-preview td {
    border: 1px solid #e5e7eb;
    padding: 10px;
    text-align: left
}

.markdown-preview th {
    background: #f9fafb
}

.preview-container.academic .markdown-preview {
    font-family: Georgia, serif;
    font-size: 12pt
}

.preview-container.academic h1 {
    text-align: center;
    border: none
}

.preview-container.minimal .markdown-preview {
    font-size: 16px
}

.preview-container.minimal h1,
.preview-container.minimal h2 {
    border: none
}

.settings-bar {
    display: flex;
    justify-content: center;
    gap: 24px;
    padding: 16px;
    margin: 0;
    border-radius: 0;
    border-top: 1px solid var(--border)
}

.setting {
    display: flex;
    align-items: center;
    gap: 10px
}

.setting label {
    font-size: .85rem;
    color: var(--text2)
}

.setting select {
    padding: 8px 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    cursor: pointer
}

.fab {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background: var(--gradient);
    border: none;
    border-radius: 50%;
    font-size: 1.3rem;
    cursor: pointer;
    box-shadow: 0 8px 20px rgba(139, 92, 246, .3);
    z-index: 10
}

.toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--bg2);
    border: 1px solid var(--accent);
    padding: 12px 20px;
    border-radius: 12px;
    opacity: 0;
    transition: .3s;
    z-index: 100
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0)
}

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

    .preview-panel {
        display: none
    }

    .settings-bar {
        flex-wrap: wrap
    }
}