:root {
    --bg-base: #000000;
    --bg-surface: #0a0a0a;
    --bg-elevated: #141414;
    --bg-hover: #1f1f1f;
    --bg-active: #2a2a2a;
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-tertiary: #6b6b6b;
    
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-muted: rgba(59, 130, 246, 0.15);
    
    --border-subtle: #1f1f1f;
    --border-default: #2a2a2a;
    
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Inter', sans-serif;
    background: var(--bg-base);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.app-header {
    background: var(--bg-surface);
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-subtle);
    height: 56px;
}

.app-header h1 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.controls {
    display: flex;
    gap: 12px;
    align-items: center;
}

.theme-select {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-default);
    padding: 8px 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 13px;
    transition: all 0.15s ease;
    min-width: 120px;
}

.theme-select:hover {
    background: var(--bg-hover);
    border-color: #3a3a3a;
}

.theme-select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-muted);
}

.btn-primary {
    background: var(--accent);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

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

.btn-primary:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--accent-muted);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-default);
    padding: 8px 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: #3a3a3a;
}

.btn-secondary:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-muted);
}

.btn-icon-left {
    font-size: 16px;
    line-height: 1;
}

/* Editor Status Bar */
.save-indicator {
    font-size: 11px;
    color: var(--text-tertiary);
    padding: 2px 8px;
    background: var(--bg-surface);
    border-radius: var(--radius-sm);
}

.save-indicator.saving {
    color: var(--accent);
}

.char-count {
    font-size: 11px;
    color: var(--text-tertiary);
    padding: 2px 8px;
    background: var(--bg-surface);
    border-radius: var(--radius-sm);
}

/* Shared Toolbar - spans both panes */
.shared-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 12px;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    gap: 12px;
}

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

.toolbar-left {
    flex: 1;
}

.toolbar-center {
    justify-content: center;
    gap: 8px;
}

.toolbar-right {
    justify-content: flex-end;
}

.toolbar-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 12px;
    min-width: 28px;
    transition: all 0.15s ease;
}

.toolbar-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-default);
}

.toolbar-btn:active {
    background: var(--bg-active);
}

.toolbar-divider {
    width: 1px;
    height: 20px;
    background: var(--border-default);
    margin: 0 4px;
}

.toolbar-select {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-default);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 11px;
    transition: all 0.15s ease;
}

.toolbar-select:hover {
    background: var(--bg-hover);
}

/* Template Select */
.template-select {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-default);
    padding: 6px 10px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 12px;
    transition: all 0.15s ease;
}

.template-select:hover {
    background: var(--bg-hover);
    border-color: var(--accent);
}

/* Find & Replace Modal */
.find-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 100px;
    z-index: 1000;
}

.find-modal-content {
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-default);
    width: 400px;
    max-width: 90%;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.find-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-subtle);
}

.find-modal-header h3 {
    font-size: 14px;
    font-weight: 600;
    margin: 0;
}

.find-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.find-close:hover {
    color: var(--text-primary);
}

.find-modal-body {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.find-input {
    background: var(--bg-surface);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    color: var(--text-primary);
    font-size: 13px;
    width: 100%;
}

.find-input:focus {
    outline: none;
    border-color: var(--accent);
}

.find-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.find-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-default);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 12px;
    transition: all 0.15s ease;
}

.find-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent);
}

/* Split Layout */
.split-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.editor-pane,
.preview-pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.editor-pane {
    border-right: 1px solid var(--border-subtle);
}

/* Mobile tabs - hidden by default */
.mobile-tabs {
    display: none;
}

.pane-header {
    background: var(--bg-surface);
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-subtle);
    font-size: 12px;
    color: var(--text-secondary);
    height: 40px;
    user-select: none;
    display: flex;
    align-items: center;
}

.pane-header span {
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.preview-container {
    flex: 1;
    overflow: auto;
    padding: 0 24px 24px 0px;
    background: var(--bg-surface);
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* CodeMirror Editor Styles - Light Theme */
.CodeMirror {
    flex: 1;
    height: auto;
    font-family: 'JetBrains Mono', 'Fira Code', 'SF Mono', Monaco, Consolas, monospace;
    font-size: 14px;
    line-height: 1.7;
    background: #fafafa !important;
    color: #1a1a1a !important;
}

.CodeMirror-gutters {
    background: #f0f0f0 !important;
    border-right: 1px solid #e0e0e0;
}

.CodeMirror-linenumber {
    color: #6b6b6b !important;
    padding: 0 12px !important;
}

.CodeMirror-cursor {
    border-left: 2px solid #3b82f6 !important;
}

.CodeMirror-selected {
    background: #bfdbfe !important;
}

.CodeMirror-focused .CodeMirror-selected {
    background: #93c5fd !important;
}

.CodeMirror-activeline-background {
    background: #f0f0f0 !important;
}

.cm-s-default .cm-header {
    color: #dc2626;
    font-weight: 600;
}

.cm-s-default .cm-variable-2 {
    color: #1a1a1a;
}

.cm-s-default .cm-string {
    color: #15803d;
}

.cm-s-default .cm-comment {
    color: #6b7280;
    font-style: italic;
}

.cm-s-default .cm-link {
    color: #2563eb;
}

.cm-s-default .cm-quote {
    color: #7c3aed;
}

.cm-s-default .cm-keyword {
    color: #dc2626;
}

.cm-s-default .cm-atom {
    color: #7c3aed;
}

.cm-s-default .cm-number {
    color: #d97706;
}

.cm-s-default .cm-def {
    color: #059669;
}

.cm-s-default .cm-tag {
    color: #dc2626;
}

.cm-s-default .cm-attribute {
    color: #059669;
}

.cm-s-default .cm-builtin {
    color: #0891b2;
}

.cm-s-default .cm-variable {
    color: #1a1a1a;
}

.cm-s-default .cm-property {
    color: #2563eb;
}

.cm-s-default .cm-operator {
    color: #dc2626;
}

.cm-s-default .cm-em {
    color: #7c3aed;
}

.cm-s-default .cm-strong {
    color: #ea580c;
    font-weight: 600;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-surface);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-active);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #3a3a3a;
}

@media print {
    /* Hide all UI elements */
    .app-header,
    .editor-pane,
    .pane-header,
    .shared-toolbar,
    .mobile-tabs,
    .controls,
    .btn-primary,
    .btn-secondary,
    .theme-select {
        display: none !important;
    }
    
    /* Reset body and html for printing */
    html, body {
        height: auto !important;
        overflow: visible !important;
        background: white !important;
    }
    
    /* Show only the preview */
    .split-container {
        display: block !important;
    }
    
    .preview-pane {
        display: block !important;
    }
    
    .preview-container {
        padding: 0 !important;
        margin: 0 !important;
        background: white !important;
        overflow: visible !important;
        display: block !important;
    }
}

/* Responsive Styles */

/* Tablet (768px - 1024px) */
@media screen and (max-width: 1024px) {
    .app-header {
        padding: 10px 16px;
    }
    
    .app-header h1 {
        font-size: 14px;
    }
    
    .controls {
        gap: 8px;
    }
    
    .theme-select {
        min-width: 100px;
        padding: 6px 10px;
        font-size: 12px;
    }
    
    .btn-primary {
        padding: 6px 12px;
        font-size: 12px;
    }
    
    .pane-header {
        padding: 8px 12px;
    }
}

/* Mobile (below 768px) - Stack layout with tabs */
@media screen and (max-width: 767px) {
    .app-header {
        flex-wrap: wrap;
        height: auto;
        padding: 10px 12px;
        gap: 8px;
    }
    
    .app-header h1 {
        font-size: 14px;
        width: 100%;
    }
    
    .controls {
        width: 100%;
        justify-content: space-between;
    }
    
    .theme-select,
    .template-select {
        flex: 1;
        min-width: auto;
        padding: 6px 8px;
        font-size: 11px;
    }
    
    .btn-primary,
    .btn-secondary {
        padding: 6px 10px;
        font-size: 11px;
    }
    
    .btn-secondary {
        display: none;
    }
    
    .btn-icon-left {
        display: none;
    }
    
    /* Mobile tab navigation */
    .mobile-tabs {
        display: flex;
        background: var(--bg-surface);
        border-bottom: 1px solid var(--border-subtle);
    }
    
    .mobile-tab {
        flex: 1;
        padding: 12px;
        background: transparent;
        border: none;
        color: var(--text-secondary);
        font-size: 13px;
        font-weight: 500;
        cursor: pointer;
        border-bottom: 2px solid transparent;
        transition: all 0.15s ease;
    }
    
    .mobile-tab.active {
        color: var(--text-primary);
        border-bottom-color: var(--accent);
    }
    
    .mobile-tab:hover {
        background: var(--bg-hover);
    }
    
    /* Stack panes vertically */
    .split-container {
        flex-direction: column;
    }
    
    .editor-pane,
    .preview-pane {
        display: none;
    }
    
    .editor-pane.active,
    .preview-pane.active {
        display: flex;
    }
    
    .editor-pane {
        border-right: none;
        border-bottom: 1px solid var(--border-subtle);
    }
    
    /* Hide shared toolbar on mobile */
    .shared-toolbar {
        display: none;
    }
    
    .preview-container {
        padding: 12px;
    }
    
    /* Scale down A4 pages on mobile */
    .a4-page {
        transform: scale(0.5);
        transform-origin: top center;
        margin-bottom: 20px;
    }
    
    .pane-header {
        padding: 8px 12px;
    }
}