/* ===========================================
   Base Styles - 앱 레이아웃 및 공통 스타일
   =========================================== */

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

:root {
    --app-bg: #f5f5f5;
    --app-text: #333;
    --header-bg: #2c3e50;
    --header-text: #fff;
    --pane-bg: #fff;
    --border-color: #ddd;
    --btn-primary: #3498db;
    --btn-primary-hover: #2980b9;
    --btn-secondary: #95a5a6;
    --btn-secondary-hover: #7f8c8d;
    --input-bg: #fff;
    --input-border: #ccc;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans KR', sans-serif;
    background: var(--app-bg);
    color: var(--app-text);
    min-height: 100vh;
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.app-header {
    text-align: center;
    margin-bottom: 20px;
    padding: 20px;
    background: var(--header-bg);
    color: var(--header-text);
    border-radius: 8px;
}

.app-header h1 {
    font-size: 1.8rem;
    margin-bottom: 8px;
}

.subtitle {
    opacity: 0.8;
    font-size: 0.95rem;
}

/* Controls */
.controls {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 20px;
    padding: 15px;
    background: var(--pane-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.control-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.control-group label {
    font-weight: 500;
}

.control-group select {
    padding: 8px 12px;
    border: 1px solid var(--input-border);
    border-radius: 4px;
    background: var(--input-bg);
    font-size: 0.95rem;
    cursor: pointer;
}

.inline-option label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    user-select: none;
    padding: 6px 10px;
    background: #e8f4fd;
    border-radius: 4px;
    border: 1px solid #b8daff;
    font-size: 0.9rem;
}

.inline-option input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--btn-primary);
}

/* Buttons */
.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background 0.2s, transform 0.1s;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: var(--btn-primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--btn-primary-hover);
}

.btn-secondary {
    background: var(--btn-secondary);
    color: #fff;
}

.btn-secondary:hover {
    background: var(--btn-secondary-hover);
}

.btn-small {
    padding: 5px 10px;
    font-size: 0.85rem;
}

/* Config Panel */
.config-panel {
    margin-bottom: 20px;
    padding: 20px;
    background: var(--pane-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.config-panel.hidden {
    display: none;
}

.config-panel h3 {
    margin-bottom: 8px;
    color: var(--header-bg);
}

.config-desc {
    margin-bottom: 15px;
    color: #666;
    font-size: 0.9rem;
}

.config-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 12px;
    margin-bottom: 15px;
}

.config-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background: #f9f9f9;
    border-radius: 4px;
    border: 1px solid #eee;
}

.config-item label {
    min-width: 120px;
    font-weight: 500;
    font-size: 0.9rem;
}

.config-item input {
    flex: 1;
    padding: 6px 10px;
    border: 1px solid var(--input-border);
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.85rem;
}

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

/* Editor Container */
.editor-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    min-height: 500px;
}

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

.editor-pane,
.preview-pane {
    display: flex;
    flex-direction: column;
    background: var(--pane-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.pane-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    background: #f8f9fa;
    border-bottom: 1px solid var(--border-color);
}

.pane-header h2 {
    font-size: 1rem;
    font-weight: 600;
}

.view-toggle {
    display: flex;
    gap: 5px;
}

.view-toggle .btn.active {
    background: var(--btn-primary);
    color: #fff;
}

/* Markdown Input */
#markdown-input {
    flex: 1;
    padding: 15px;
    border: none;
    resize: none;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.6;
    background: var(--input-bg);
}

#markdown-input:focus {
    outline: none;
}

/* Preview Content */
.preview-content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

.source-content {
    flex: 1;
    margin: 0;
    padding: 15px;
    overflow: auto;
    background: #282c34;
    color: #abb2bf;
    font-size: 0.85rem;
    line-height: 1.5;
}

.source-content.hidden {
    display: none;
}

.source-content code {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    white-space: pre-wrap;
    word-break: break-all;
}

/* Footer */
.app-footer {
    margin-top: 20px;
    padding: 15px;
    text-align: center;
    color: #666;
    font-size: 0.85rem;
}

.app-footer .copyright {
    margin-top: 8px;
    font-size: 0.8rem;
    color: #999;
}

/* Utility */
.hidden {
    display: none !important;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 12px 20px;
    background: #2c3e50;
    color: #fff;
    border-radius: 4px;
    font-size: 0.9rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s, transform 0.3s;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}