:root {
    --font-family: 'DM Sans', sans-serif;
    --accent-color: #6C63FF;
    --z-canvas: 10;
    --z-ui: 100;
    --z-dropdown: 200;
    --z-modal: 1000;
    --topbar-height: 50px;
    --statusbar-height: 30px;
    --toolbar-width: 100px;
    --panel-width: 300px;
    --transition-fast: 0.15s ease;
    --transition-med: 0.25s ease;
}

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

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-app);
    color: var(--text-primary);
    overflow: hidden;
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

.main-content {
    display: flex;
    flex: 1;
    height: calc(100vh - var(--topbar-height) - var(--statusbar-height));
}

.workspace {
    flex: 1;
    position: relative;
    background-color: var(--bg-workspace);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.workspace-hint {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1;
    color: var(--text-secondary);
    opacity: 0.5;
    pointer-events: none;
}

.workspace-hint button {
    pointer-events: auto;
}

.canvas-container-wrapper {
    position: relative;
    background: transparent;
    box-shadow: 0 4px 24px rgba(0,0,0,0.3);
    transition: width var(--transition-fast), height var(--transition-fast);
}

.topbar {
    height: var(--topbar-height);
    background-color: var(--bg-panel);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 16px;
    z-index: var(--z-ui);
    -webkit-app-region: drag;
}

.topbar-left, .topbar-center, .topbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
    -webkit-app-region: no-drag;
}

.brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 16px;
    color: var(--accent-color);
    letter-spacing: -0.3px;
}

.menu {
    display: flex;
    gap: 4px;
}

.menu-item {
    position: relative;
    padding: 6px 10px;
    cursor: pointer;
    border-radius: 4px;
    transition: background-color var(--transition-fast);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    -webkit-app-region: no-drag;
}

.menu-item:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--bg-panel);
    min-width: 220px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    z-index: var(--z-dropdown);
    padding: 6px 0;
    animation: dropdownIn var(--transition-fast) ease;
}

@keyframes dropdownIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown-content a {
    color: var(--text-primary);
    padding: 8px 16px;
    text-decoration: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    transition: background-color var(--transition-fast);
    cursor: pointer;
}

.dropdown-content a:hover {
    background-color: var(--bg-hover);
    color: var(--accent-color);
}

.dropdown-content .shortcut {
    color: var(--text-secondary);
    font-size: 11px;
    font-family: inherit;
}

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

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6px;
    transition: all var(--transition-fast);
}

.icon-btn:hover:not(:disabled) {
    background-color: var(--bg-hover);
    color: var(--accent-color);
}

.icon-btn:active:not(:disabled) {
    transform: scale(0.95);
}

.icon-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.icon-btn.small {
    padding: 4px;
}

.primary-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 8px 18px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
    letter-spacing: 0.2px;
}

.primary-btn:hover {
    filter: brightness(1.12);
    box-shadow: 0 2px 12px rgba(108, 99, 255, 0.3);
}

.primary-btn:active {
    transform: scale(0.97);
}

.text-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-size: 12px;
    transition: all var(--transition-fast);
    font-weight: 500;
}

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

.text-btn.active {
    background-color: var(--bg-active);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.text-btn:active {
    transform: scale(0.97);
}

input[type="range"] {
    width: 100%;
    accent-color: var(--accent-color);
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    cursor: pointer;
}

.select-input, .num-input {
    background-color: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 6px 8px;
    border-radius: 6px;
    font-family: inherit;
    font-size: 13px;
    outline: none;
    transition: border-color var(--transition-fast);
}

.select-input:focus, .num-input:focus {
    border-color: var(--accent-color);
}

.statusbar {
    height: var(--statusbar-height);
    background-color: var(--bg-panel);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 16px;
    font-size: 12px;
    color: var(--text-secondary);
    z-index: var(--z-ui);
}

.zoom-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.zoom-controls input[type="range"] {
    width: 100px;
}

.menu-item.disabled {
    opacity: 0.4;
    pointer-events: none;
}

/* Splash screen */
.splash-screen {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--bg-app, #121212);
    transition: opacity 0.4s ease;
}
.splash-logo {
    width: 48px;
    height: 48px;
    margin-bottom: 16px;
    opacity: 0.8;
}
.splash-text {
    color: var(--text-secondary, #9e9e9e);
    font-size: 13px;
    font-family: 'DM Sans', sans-serif;
    font-weight: 500;
    letter-spacing: 0.5px;
}
.splash-loader {
    margin-top: 16px;
    width: 120px;
    height: 2px;
    background: var(--border-color, #333);
    border-radius: 1px;
    overflow: hidden;
}
.splash-loader-bar {
    width: 40%;
    height: 100%;
    background: var(--accent-color, #6C63FF);
    border-radius: 1px;
    animation: loadPulse 1s ease-in-out infinite;
}

/* AI status bar */
.ai-status-bar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 99999;
    background: var(--bg-panel);
    border-top: 1px solid var(--border-color);
    padding: 8px 16px;
    font-size: 13px;
    color: var(--text-color);
}
.ai-progress-track {
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    margin-top: 4px;
    overflow: hidden;
}
.ai-progress-bar {
    height: 100%;
    width: 0%;
    background: var(--accent-color);
    transition: width .3s;
}

/* About modal layout */
.about-content {
    text-align: center;
}
.about-icon {
    font-size: 48px;
    margin-bottom: 12px;
}
.about-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 6px;
}
.about-subtitle {
    color: var(--text-secondary);
    font-size: 13px;
    margin-bottom: 4px;
}
.about-version {
    color: var(--text-secondary);
    font-size: 12px;
    margin-bottom: 24px;
}
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 20px;
    text-align: left;
}
.about-card {
    background: var(--bg-app);
    border-radius: 8px;
    padding: 14px;
}
.about-card-icon {
    font-size: 20px;
    margin-bottom: 6px;
}
.about-card-title {
    font-weight: 600;
    font-size: 13px;
    margin-bottom: 4px;
}
.about-card-desc {
    font-size: 12px;
    color: var(--text-secondary);
}
.about-footer {
    font-size: 11px;
    color: var(--text-secondary);
}

/* Modal footer */
.modal-footer-center {
    justify-content: center;
}

@keyframes loadPulse {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(350%); }
}

/* Modal sizing */
.modal.shortcuts-modal {
    width: 560px;
    max-height: 80vh;
    overflow-y: auto;
}
.modal.about-modal {
    width: 440px;
}

/* Zoom label */
.zoom-label {
    min-width: 40px;
}

/* Export quality group */
.export-quality-group {
    display: none;
}
.export-watermark-controls {
    display: none;
}

/* Toast notifications */
.toast-container {
    position: fixed;
    top: 60px;
    right: 16px;
    z-index: 100000;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}
.toast {
    pointer-events: auto;
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    cursor: pointer;
    transition: all 0.3s ease;
    transform: translateX(120%);
    opacity: 0;
    max-width: 360px;
    border: 1px solid rgba(255,255,255,0.08);
}
.toast-visible {
    transform: translateX(0);
    opacity: 1;
}
.toast-hiding {
    transform: translateX(120%);
    opacity: 0;
}
.toast-info {
    background: #1e1e2e;
    color: #e0e0e0;
    border-left: 3px solid var(--accent-color);
}
.toast-error {
    background: #2d1b1b;
    color: #fca5a5;
    border-left: 3px solid #ef4444;
}
.toast-warning {
    background: #2d2815;
    color: #fcd34d;
    border-left: 3px solid #f59e0b;
}
.toast-success {
    background: #1b2d1b;
    color: #86efac;
    border-left: 3px solid #22c55e;
}

/* Demo badge */
.demo-badge {
    font-size: 9px;
    font-weight: 800;
    letter-spacing: 1.5px;
    padding: 2px 6px;
    border-radius: 3px;
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    color: #fff;
    text-transform: uppercase;
    margin-left: 2px;
}

/* Buy Full Version button */
.buy-btn {
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    border: none;
    color: #fff;
    padding: 6px 14px;
    border-radius: 6px;
    font-weight: 700;
    font-size: 12px;
    cursor: pointer;
    font-family: inherit;
    letter-spacing: 0.3px;
    transition: all var(--transition-fast);
    white-space: nowrap;
}
.buy-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 3px 16px rgba(239, 68, 68, 0.45);
}
.buy-btn:active {
    transform: scale(0.96);
}

/* Purchase prompt modal */
.purchase-content {
    text-align: center;
}
.purchase-icon {
    font-size: 48px;
    margin-bottom: 12px;
}
.purchase-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 8px;
}
.purchase-desc {
    color: var(--text-secondary);
    font-size: 13px;
    margin-bottom: 16px;
    line-height: 1.5;
}
.purchase-features {
    list-style: none;
    text-align: left;
    max-width: 340px;
    margin: 0 auto 12px;
}
.purchase-features li {
    padding: 6px 0;
    font-size: 13px;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
}
.purchase-features li:last-child {
    border-bottom: none;
}
.purchase-cta {
    background: linear-gradient(135deg, #f59e0b, #ef4444) !important;
    font-size: 14px !important;
    padding: 10px 24px !important;
}
.purchase-cta:hover {
    box-shadow: 0 4px 20px rgba(239, 68, 68, 0.5) !important;
}
.modal.purchase-modal {
    width: 420px;
}

/* Demo export notice */
.demo-export-notice {
    font-size: 11px;
    color: var(--text-secondary);
    padding: 6px 10px;
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 6px;
    margin-bottom: 12px;
    text-align: center;
}
.demo-export-notice a {
    color: #ef4444;
    font-weight: 600;
    text-decoration: underline;
    cursor: pointer;
}
.demo-export-notice a:hover {
    color: #f59e0b;
}