:root {
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --border-color: #ccc;
    --bg-color: #f8f9fa;
    --header-bg: #ffffff;
    --pane-bg: #ffffff;
    --text-color: #333;
}

* {
    box-sizing: border-box;
}

body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    display: flex;
    flex-direction: column;
}

/* Global Header */
#global-header {
    background-color: var(--header-bg);
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.header-field {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 200px;
}

.header-field label {
    font-size: 0.8rem;
    font-weight: bold;
    margin-bottom: 0.2rem;
    color: #666;
}

.header-field input {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

/* Toolbar */
#toolbar {
    background-color: #eee;
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#toolbar button {
    padding: 0.4rem 0.8rem;
    cursor: pointer;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: 4px;
}

#toolbar button:hover {
    background: #f0f0f0;
}

#toolbar .primary-btn {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-hover);
    margin-left: auto;
}

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

/* App Container (Split Pane) */
#app-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

#left-pane {
    flex: 2;
    background-color: var(--pane-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 1rem;
}

#editor {
    flex: 1;
    outline: none;
    overflow-y: auto;
    font-size: 1rem;
    line-height: 1.5;
}

#editor:empty:before {
    content: attr(placeholder);
    color: #aaa;
}

#right-pane {
    flex: 1;
    min-width: 300px;
    background-color: var(--bg-color);
    padding: 1rem;
    overflow-y: auto;
}

#right-pane h3 {
    margin-top: 0;
    font-size: 1.1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

/* Smart Link in Editor */
.smart-link {
    color: var(--primary-color);
    text-decoration: underline;
    cursor: pointer;
    background: rgba(0, 123, 255, 0.1);
    padding: 0 2px;
    border-radius: 2px;
}

/* Config Cards */
.config-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.config-card h4 {
    margin: 0 0 0.8rem 0;
    font-size: 0.9rem;
    color: #555;
}

.card-field {
    margin-bottom: 0.8rem;
}

.card-field label {
    display: block;
    font-size: 0.75rem;
    margin-bottom: 0.2rem;
    color: #777;
}

.card-field input, .card-field textarea {
    width: 100%;
    padding: 0.4rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.9rem;
}

.card-field textarea {
    height: 80px;
    resize: vertical;
}

/* Toast */
#toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: #333;
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 30px;
    z-index: 1000;
    transition: opacity 0.3s;
}

.hidden {
    display: none;
    opacity: 0;
}