:root {
    /* Branding Core */
    --theme-primary: #124438;
    --gold-accent: #c5a059;
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    
    /* Nord Dark Environment */
    --nord-bg-sidebar: #252932;
    --nord-bg-editor: #2E3440;
    --nord-bg-active: #3B4252;
    --nord-bg-hover: #434C5E;
    --nord-text-primary: #ECEFF4;
    --nord-text-secondary: #D8DEE9;
    --nord-text-muted: #4C566A;
    --nord-h1: #EBCB8B;
    --nord-h2: #88C0D0;
    --nord-h3: #A3BE8C;
    --nord-link: #81A1C1;
    --nord-tag: #B48EAD;
    --nord-code-bg: #3B4252;
    --nord-border: #434C5E;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: var(--font-stack);
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--nord-bg-editor);
    color: var(--nord-text-primary);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ==========================================================================
   MASTER NAVIGATION RIBBON (Arisyn Standards)
   ========================================================================== */
.navbar {
    background-color: var(--theme-primary);
    border-bottom: 3px solid var(--gold-accent);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 6px 30px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.nav-brand-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: color-mix(in srgb, var(--theme-primary) 40%, #ffffff); 
    padding: 4px 20px; 
    border-radius: 40px;
    border: 2px solid var(--theme-primary);
    box-shadow: 0 4px 0 var(--theme-primary), 0 8px 12px rgba(0,0,0,0.15);
    text-decoration: none;
    transition: transform 0.1s ease, box-shadow 0.1s ease;
    flex-shrink: 0; 
}

.nav-brand-pill:active {
    transform: translateY(4px);
    box-shadow: 0 0px 0 var(--theme-primary), 0 4px 6px rgba(0,0,0,0.15);
}

.nav-divider {
    width: 5px;
    height: 35px;
    background-color: rgba(255,255,255,0.2);
    border-radius: 2px;
    flex-shrink: 0;
}

.app-name {
    color: white;
    font-weight: 600;
    font-size: 16px;
    letter-spacing: 0.5px;
}

.nav-controls {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 15px;
}

.nav-search input {
    width: 300px;
    padding: 8px 16px;
    border-radius: 6px; 
    border: 1px solid rgba(255,255,255,0.3);
    outline: none;
    font-size: 13px;
    background-color: rgba(0,0,0,0.2);
    color: #ffffff;
    transition: box-shadow 0.3s ease;
}

.nav-search input::placeholder {
    color: rgba(255,255,255,0.6);
}

.nav-search input:focus {
    box-shadow: 0 0 0 2px var(--gold-accent); 
}

.settings-btn {
    background-color: #ffffff;
    border-radius: 50%;
    padding: 8px;
    height: 36px;
    width: 36px;
    border: none;
    cursor: pointer;
    color: var(--theme-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.15);
    transition: transform 0.2s ease;
}

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

/* ==========================================================================
   APP LAYOUT & SIDEBAR
   ========================================================================== */
.app-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.sidebar {
    width: 260px;
    background-color: var(--nord-bg-sidebar);
    border-right: 1px solid var(--nord-border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-actions {
    display: flex;
    gap: 8px;
    padding: 12px;
    border-bottom: 1px solid var(--nord-border);
}

.action-btn {
    flex: 1;
    background: var(--nord-bg-hover);
    color: var(--nord-text-primary);
    border: 1px solid var(--nord-border);
    padding: 6px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
}

.action-btn:hover { background: var(--nord-bg-active); }

.file-tree {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}

.tree-item {
    padding: 6px 12px 6px 24px;
    cursor: pointer;
    font-size: 13px;
    color: var(--nord-text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
    user-select: none;
}

.tree-item:hover { background-color: var(--nord-bg-hover); }

.tree-item.active {
    background-color: var(--nord-bg-active);
    border-left: 3px solid var(--gold-accent);
    color: var(--nord-text-primary);
    padding-left: 21px; 
}

/* ==========================================================================
   EDITOR WORKSPACE
   ========================================================================== */
.editor-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--nord-bg-editor);
    min-width: 0;
}

.tab-bar {
    display: flex;
    background-color: var(--nord-bg-sidebar);
    border-bottom: 1px solid var(--nord-border);
    padding-top: 6px;
    overflow-x: auto;
}

.tab {
    background-color: var(--nord-bg-editor);
    color: var(--nord-text-secondary);
    padding: 6px 16px;
    border-top-left-radius: 6px;
    border-top-right-radius: 6px;
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    border: 1px solid var(--nord-border);
    border-bottom: none;
    margin-left: 6px;
    white-space: nowrap;
}

.tab.active {
    color: var(--nord-text-primary);
    border-top: 2px solid var(--gold-accent);
}

.close-tab {
    font-weight: bold;
    cursor: pointer;
    padding: 0 4px;
}
.close-tab:hover { color: var(--nord-h1); }

.editor-header {
    padding: 10px 16px;
    border-bottom: 1px solid var(--nord-border);
}

.breadcrumb {
    font-size: 11px;
    color: var(--nord-text-muted);
    margin-bottom: 8px;
}

.formatting-toolbar {
    display: flex;
    gap: 4px;
    align-items: center;
}

.formatting-toolbar button {
    background: transparent;
    border: 1px solid transparent;
    color: var(--nord-text-secondary);
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
}

.formatting-toolbar button:hover {
    background: var(--nord-bg-hover);
    color: var(--nord-text-primary);
}

.toolbar-divider {
    width: 1px;
    height: 16px;
    background-color: var(--nord-border);
    margin: 0 4px;
}

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

.editor-workspace.split-view .raw-editor,
.editor-workspace.split-view .preview-pane {
    width: 50%;
}

.editor-workspace.edit-only .raw-editor { width: 100%; border-right: none; }
.editor-workspace.edit-only .preview-pane { display: none; }

.raw-editor {
    background-color: var(--nord-bg-editor);
    color: var(--nord-text-primary);
    border: none;
    border-right: 1px solid var(--nord-border);
    padding: 24px;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.6;
    resize: none;
    outline: none;
    height: 100%;
}

.preview-pane {
    padding: 24px;
    overflow-y: auto;
    height: 100%;
    color: var(--nord-text-secondary);
    line-height: 1.6;
}

/* Markdown Rendering Overrides */
.preview-pane h1 { color: var(--nord-h1); margin-bottom: 16px; font-weight: normal; border-bottom: 1px solid var(--nord-border); padding-bottom: 8px;}
.preview-pane h2 { color: var(--nord-h2); margin-top: 24px; margin-bottom: 12px; font-weight: normal; }
.preview-pane h3 { color: var(--nord-h3); margin-top: 20px; margin-bottom: 10px; font-weight: normal; }
.preview-pane a { color: var(--nord-link); text-decoration: none; }
.preview-pane code { background: var(--nord-code-bg); padding: 2px 6px; border-radius: 4px; font-family: monospace; font-size: 0.9em; }
.preview-pane pre { background: var(--nord-code-bg); padding: 16px; border-radius: 8px; overflow-x: auto; }
.preview-pane blockquote { border-left: 4px solid var(--nord-border); margin: 0; padding-left: 16px; color: var(--nord-text-muted); }

/* Status Bar */
.status-bar {
    height: 28px;
    background-color: var(--nord-bg-sidebar);
    border-top: 1px solid var(--nord-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 16px;
    font-size: 11px;
    color: var(--nord-text-muted);
}

.status-left, .status-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 4px;
}
.dot.green { background-color: var(--nord-h3); }
.dot.amber { background-color: var(--nord-h1); }

/* ==========================================================================
   SETTINGS MODAL OVERLAY
   ========================================================================== */
.overlay-hidden { display: none; }
#settingsOverlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.6); z-index: 2000;
}

.settings-modal {
    background: var(--nord-bg-editor);
    width: 80%; max-width: 900px; height: 80%;
    margin: 5% auto; border-radius: 12px;
    display: flex; overflow: hidden;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
    border: 1px solid var(--nord-border);
}

.settings-sidebar {
    width: 250px;
    background: var(--nord-bg-sidebar);
    border-right: 1px solid var(--nord-border);
    padding: 20px;
}

.settings-sidebar h2 { font-size: 20px; margin-bottom: 20px; color: var(--nord-text-primary); }

.settings-tab {
    padding: 12px 15px; border-radius: 8px; font-weight: 500;
    color: var(--nord-text-secondary); cursor: pointer;
    margin-bottom: 5px; transition: all 0.2s;
}

.settings-tab.active, .settings-tab:hover {
    background: var(--nord-bg-active); color: var(--nord-text-primary);
}

.settings-content {
    flex-grow: 1; padding: 40px; position: relative;
}

.close-btn {
    position: absolute; top: 20px; right: 20px;
    background: none; border: none; font-size: 28px;
    color: var(--nord-text-muted); cursor: pointer;
}
.close-btn:hover { color: var(--nord-text-primary); }

.settings-panel { display: none; }
.settings-panel.active { display: block; }
.settings-panel h3 { color: var(--nord-text-primary); margin-bottom: 8px; }
.settings-desc { color: var(--nord-text-muted); font-size: 13px; margin-bottom: 24px; }

.color-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 15px; max-width: 600px; }
.color-swatch { height: 50px; border: none; border-radius: 8px; cursor: pointer; transition: transform 0.1s; }
.color-swatch:hover { transform: scale(1.05); }

.btn-primary {
    background-color: var(--theme-primary); color: #ffffff;
    padding: 10px 20px; border: none; border-radius: 6px;
    font-weight: 600; cursor: pointer; transition: opacity 0.2s;
}
.btn-primary:hover { opacity: 0.9; }

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