:root {
    --bg-base: #0f1115;
    --bg-surface: #181a1f;
    --bg-surface-hover: #22252b;
    --border-color: #2b2f36;
    --text-main: #f0f2f5;
    --text-muted: #9aa0a6;
    --primary: #4ade80;
    --primary-hover: #22c55e;
    --danger: #ef4444;
    --accent: #60a5fa;

    --font-heading: 'Inter', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'Fira Code', monospace;
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-base);
    color: var(--text-main);
    line-height: 1.5;
    overflow: hidden;
}

/* Typography */
h1, h2, h3, h4 { font-family: var(--font-heading); font-weight: 600; }
a { color: var(--accent); text-decoration: none; }

/* Utilities */
.hidden { display: none !important; }
.full-width { width: 100%; }

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    outline: none;
    font-family: var(--font-heading);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn.primary {
    background-color: var(--primary);
    color: #000;
    box-shadow: 0 4px 14px 0 rgba(74, 222, 128, 0.3);
}

.btn.primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn.publish {
    background-color: transparent;
    border-color: var(--primary);
    color: var(--primary);
    padding: 0.75rem;
}

.btn.publish:hover:not(:disabled) {
    background-color: var(--primary);
    color: #000;
}

.btn.ghost {
    background-color: transparent;
    border-color: var(--border-color);
    color: var(--text-main);
}

.btn.ghost:hover {
    background-color: var(--bg-surface-hover);
}

.btn.danger {
    background-color: transparent;
    border-color: var(--danger);
    color: var(--danger);
    padding: 0.75rem;
}

.btn.danger:hover:not(:disabled) {
    background-color: var(--danger);
    color: #fff;
}

.delete-icon-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    opacity: 0;
    flex-shrink: 0;
    width: 24px;
    height: 24px;
}

.file-item:hover .delete-icon-btn {
    opacity: 1;
}

.delete-icon-btn:hover {
    color: var(--danger);
    background-color: rgba(239, 68, 68, 0.1);
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 420px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    text-align: center;
    animation: scaleIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes scaleIn {
    0% { transform: scale(0.95); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.modal-content h2 {
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
}

.modal-content p {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

.modal-content code {
    background: var(--bg-base);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: var(--font-mono);
    color: var(--primary);
}

.modal-content input {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-size: 1rem;
    font-family: var(--font-mono);
    margin-bottom: 1rem;
    transition: border-color 0.2s ease;
}

.modal-content input:focus {
    border-color: var(--primary);
    outline: none;
}

.modal-content button {
    width: 100%;
    padding: 0.875rem;
}

/* App Layout */
#app-container {
    display: grid;
    grid-template-columns: 280px 1fr 300px;
    height: 100vh;
}

/* Common Sidebar Styles */
.sidebar, .metadata-panel {
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.metadata-panel {
    border-right: none;
    border-left: 1px solid var(--border-color);
}

/* Left Sidebar */
.sidebar-header {
    padding: 1.5rem 1.25rem 1rem;
}

.sidebar-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.folder-select-wrapper {
    position: relative;
    margin-bottom: 1rem;
}

.folder-select-wrapper::after {
    content: '';
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid var(--text-muted);
    pointer-events: none;
}

select#folder-selector {
    width: 100%;
    padding: 0.625rem 2rem 0.625rem 0.75rem;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-family: var(--font-heading);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    transition: all 0.2s ease;
}

select#folder-selector:hover {
    border-color: var(--text-muted);
    background-color: var(--bg-surface-hover);
}

select#folder-selector:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.15);
}

select#folder-selector option {
    background-color: var(--bg-surface);
    color: var(--text-main);
    padding: 0.5rem;
}

.sidebar-actions {
    padding: 0 1.25rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.file-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem 0;
}

.file-item {
    padding: 0.75rem 1.25rem;
    cursor: pointer;
    border-left: 3px solid transparent;
    transition: all 0.2s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.file-item:hover {
    background-color: var(--bg-surface-hover);
}

.file-item.active {
    background-color: var(--bg-surface-hover);
    border-left-color: var(--primary);
}

.file-name {
    font-size: 0.875rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
    min-width: 0;
}

.badge {
    font-size: 0.65rem;
    text-transform: uppercase;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-weight: 600;
}

.badge.draft {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
}

.badge.published {
    background: rgba(74, 222, 128, 0.15);
    color: var(--primary);
}

.sidebar-footer {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
}

/* Center Editor Area */
.editor-area {
    display: flex;
    flex-direction: column;
    background-color: var(--bg-base);
}

.editor-header {
    height: 60px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
}

.filename-badge {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-muted);
}

.editor-workspace {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.editor-pane {
    flex: 1;
    height: 100%;
    overflow: auto;
}

.cm-editor {
    height: 100%;
    font-size: 15px;
    font-family: var(--font-mono) !important;
}

/* Override CM outlines */
.cm-focused { outline: none !important; }
.cm-scroller { padding: 1rem 0; font-family: var(--font-mono) !important; }

.preview-pane {
    flex: 1;
    height: 100%;
    overflow-y: auto;
    background-color: var(--bg-base);
    border-left: 1px solid var(--border-color);
    padding: 2rem;
}

.prose {
    max-width: 65ch;
    margin: 0 auto;
}
.prose h1, .prose h2, .prose h3 { margin-top: 1.5em; margin-bottom: 0.5em; }
.prose p { margin-bottom: 1em; line-height: 1.7; color: #d1d5db; }
.prose a { color: var(--primary); }
.prose code { background-color: var(--bg-surface-hover); padding: 0.2em 0.4em; border-radius: 4px; font-family: var(--font-mono); font-size: 0.85em; }
.prose pre { padding: 1em; background-color: var(--bg-surface); border-radius: var(--radius-md); overflow-x: auto; border: 1px solid var(--border-color); margin-bottom: 1em; }
.prose pre code { background: none; padding: 0; }
.prose blockquote { border-left: 4px solid var(--accent); padding-left: 1em; color: var(--text-muted); font-style: italic; margin-bottom: 1em; }
.prose img { max-width: 100%; border-radius: var(--radius-sm); }
.prose ul, .prose ol { padding-left: 1.5em; margin-bottom: 1em; color: #d1d5db;}

/* Right Metadata Panel */
.panel-header {
    padding: 1.5rem 1.25rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.panel-header h3 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.panel-content {
    padding: 1.25rem;
    flex: 1;
    overflow-y: auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label:not(.toggle-label) {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
}

.form-group input[type="text"],
.form-group input[type="datetime-local"] {
    width: 100%;
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.6rem;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.form-group input[type="text"]:focus,
.form-group input[type="datetime-local"]:focus {
    outline: none;
    border-color: var(--primary);
}

/* Custom Toggle Switch */
.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.toggle-switch input { display: none; }

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-muted);
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: rgba(74, 222, 128, 0.2);
    border-color: var(--primary);
}

input:checked + .slider:before {
    transform: translateX(20px);
    background-color: var(--primary);
}

.toggle-label {
    font-size: 0.875rem;
    font-weight: 500;
}

.panel-footer {
    padding: 1.25rem;
    border-top: 1px solid var(--border-color);
}

.status-message {
    font-size: 0.75rem;
    margin-bottom: 0.75rem;
    text-align: center;
    min-height: 18px;
}
.status-message.success { color: var(--primary); }
.status-message.error { color: var(--danger); }
.status-message.working { color: var(--accent); }

/* Zen Mode */
body.zen-mode .sidebar,
body.zen-mode .metadata-panel {
    display: none;
}

body.zen-mode #app-container {
    grid-template-columns: 1fr;
}

body.zen-mode .editor-area {
    width: 100vw;
}

body.zen-mode #zen-mode-btn {
    background-color: var(--primary);
    color: #000;
}

/* Hide preview split in zen mode */
body.zen-mode .toastui-editor-md-splitter {
    display: none;
}

body.zen-mode .toastui-editor-preview {
    display: none;
}

body.zen-mode .toastui-editor-md-main-container {
    flex: 1;
}