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

body {
    font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, "Helvetica Neue", Arial, sans-serif;
    background: #f5f7fb;
    color: #1f2937;
    overflow: auto;
}

:root {
    --text-default: #1f2937;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --hover-bg: #eef2f7;
    --panel-bg: #ffffff;
    --radius-lg: 12px;
    --shadow-soft: 0 8px 16px rgba(15, 23, 42, 0.05);
}

.app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.menu-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 8px 16px;
    background: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 20;
    min-height: 44px;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.06);
    flex-wrap: wrap;
}

[hidden] {
    display: none !important;
}

.menu-entry {
    position: relative;
    display: inline-flex;
}

.menu-button {
    background: none;
    border: none;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-default);
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 6px;
    position: relative;
    transition: background-color 160ms ease, color 160ms ease, box-shadow 160ms ease;
}

.menu-button:hover,
.menu-button[aria-expanded="true"] {
    background: var(--hover-bg);
}

.menu-button::after {
    content: '';
    position: absolute;
    left: 10px;
    right: 10px;
    bottom: 4px;
    height: 2px;
    background: #c7d2fe;
    opacity: 0;
    transform: translateY(2px) scaleX(0.7);
    transition: opacity 160ms ease, transform 180ms ease;
    border-radius: 999px;
    will-change: transform, opacity;
}

.menu-button:hover::after {
    opacity: 1;
    transform: translateY(0) scaleX(1);
}

.menu-button[aria-expanded="true"] {
    background: #e0e7ff;
}

.menu-button:focus-visible {
    outline: 2px solid #4f46e5;
    outline-offset: 2px;
}

.menu-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 10px 12px;
    box-shadow: 0 16px 32px rgba(15, 23, 42, 0.14);
    font-size: 0.9rem;
    color: var(--text-muted);
    min-width: 180px;
    display: grid;
    gap: 4px;
    z-index: 30;
    opacity: 0;
    transform: translateY(-6px);
    transition: opacity 160ms ease, transform 160ms ease;
}

.menu-dropdown:not([hidden]) {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    .menu-dropdown {
        transition: none;
    }
}

.menu-item {
    text-align: left;
    background: none;
    border: none;
    padding: 8px 10px;
    border-radius: 6px;
    font-size: 0.9rem;
    color: #374151;
    cursor: pointer;
    min-height: 34px;
    transition: background-color 140ms ease, color 140ms ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.menu-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    color: #64748b;
}

.menu-item:hover,
.menu-item:focus {
    background: var(--hover-bg);
    outline: none;
}

.menu-item:focus-visible {
    outline: 2px solid #4f46e5;
    outline-offset: 2px;
}

.menu-item:active {
    background: #e0e7ff;
}

.menu-item.is-active {
    background: #e0e7ff;
    color: #1d4ed8;
}

.menu-group {
    border-top: 1px solid var(--border-color);
    margin-top: 6px;
    padding-top: 6px;
    display: grid;
    gap: 4px;
}

.menu-group-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: #9ca3af;
    padding: 2px 6px;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    background: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.04);
}

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

.header h1 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-default);
}

.file-name {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.unsaved-indicator {
    font-size: 0.85rem;
    color: #b45309;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.separator {
    width: 1px;
    height: 24px;
    background: var(--border-color);
    margin: 0 8px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: #374151;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease, box-shadow 160ms ease, transform 120ms ease;
}

.btn:hover:not(:disabled) {
    background: var(--hover-bg);
    border-color: #cbd5e1;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn:focus-visible {
    outline: 2px solid #4f46e5;
    outline-offset: 2px;
}

.btn-primary {
    background: #2563eb;
    border-color: #2563eb;
    color: white;
    box-shadow: 0 6px 14px rgba(37, 99, 235, 0.18);
}

.btn-primary:hover:not(:disabled) {
    background: #1d4ed8;
    box-shadow: 0 8px 18px rgba(37, 99, 235, 0.22);
}

.btn-primary:active:not(:disabled) {
    background: #1e40af;
    box-shadow: 0 4px 10px rgba(30, 64, 175, 0.22);
    transform: translateY(1px);
}

.btn-secondary {
    background: #f3f4f6;
}

.btn-small {
    padding: 6px 10px;
    font-size: 0.82rem;
}

/* Main Layout */
.main {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Toolbar */
.toolbar {
    width: 52px;
    background: #f8fafc;
    border-right: 1px solid var(--border-color);
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.tool-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.tool-group:last-child {
    border-bottom: none;
}

.tool-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 10px;
    color: #94a3b8;
    cursor: pointer;
    transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease, box-shadow 160ms ease;
}

.tool-btn:hover {
    background: var(--hover-bg);
    color: #1f2937;
}

.tool-btn.active {
    background: #e0e7ff;
    color: #1d4ed8;
    border-color: #c7d2fe;
    box-shadow: 0 6px 12px rgba(37, 99, 235, 0.16);
}

.tool-btn:focus-visible {
    outline: 2px solid #4f46e5;
    outline-offset: 2px;
}

.tool-btn svg {
    width: 20px;
    height: 20px;
}

.tool-colors {
    flex-direction: row;
    justify-content: center;
    gap: 4px;
}

.tool-colors input[type="color"] {
    width: 24px;
    height: 24px;
    border: 2px solid #cbd5e1;
    border-radius: 4px;
    cursor: pointer;
    padding: 0;
}

.tool-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-align: center;
}

.slider {
    width: 100%;
    -webkit-appearance: none;
    height: 4px;
    background: #e5e7eb;
    border-radius: 2px;
    outline: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    background: #2563eb;
    border-radius: 50%;
    cursor: pointer;
}

.site-footer {
    padding: 20px 16px 28px;
    background: var(--panel-bg);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: flex-start;
    justify-content: space-between;
}

.footer-left {
    flex: 1 1 220px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-links {
    flex: 1 1 180px;
    display: flex;
    gap: 16px;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
}

.footer-links a,
.footer-links button {
    color: #2563eb;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    font-family: inherit;
}

.footer-links a:hover,
.footer-links button:hover {
    color: #1d4ed8;
}

.footer-contact {
    flex: 1 1 220px;
    text-align: right;
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.5;
}

.footer-about {
    max-width: 1200px;
    margin: 12px auto 0;
    padding: 16px 20px;
    background: #f8fafc;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    color: #4b5563;
    font-size: 0.9rem;
}

.footer-about p + p {
    margin-top: 8px;
}

@media (max-width: 720px) {
    .footer-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-links {
        justify-content: flex-start;
    }

    .footer-contact {
        text-align: left;
    }
}

/* Canvas Container */
.canvas-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f9fafb;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin: 16px;
    box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.04);
    overflow: auto;
    position: relative;
}

.upload-prompt {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 40px;
    border: 2px dashed #cbd5e1;
    border-radius: 16px;
    background: #f8fafc;
    cursor: pointer;
    transition: all 0.3s;
}

.upload-prompt[hidden] {
    display: none !important;
}

.upload-prompt:hover {
    border-color: #2563eb;
    background: #eef2ff;
}

.upload-prompt.dragover {
    border-color: #2563eb;
    background: #e0e7ff;
    box-shadow: 0 12px 24px rgba(37, 99, 235, 0.12);
}

.upload-prompt .upload-icon {
    color: #94a3b8;
}

.upload-prompt:hover .upload-icon {
    color: #2563eb;
}

.upload-prompt p {
    color: var(--text-muted);
}

.upload-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-default);
}

.upload-subtitle {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.canvas-wrapper {
    position: relative;
    display: inline-block;
}

.canvas-wrapper canvas {
    display: block;
}

#overlayCanvas {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
}

/* Properties Panel */
.properties-panel {
    width: 240px;
    background: #f8fafc;
    border-left: 1px solid var(--border-color);
    padding: 16px;
    overflow-y: auto;
    display: grid;
    gap: 16px;
}

.panel-section {
    padding: 14px;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
}

.panel-section h3 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.prop-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    margin-bottom: 6px;
}

.prop-row span:first-child {
    color: var(--text-muted);
}

.adjustment {
    margin-bottom: 12px;
}

.adjustment label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 6px;
    font-weight: 500;
}

.adjustment-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.adjustment input[type="range"] {
    width: 100%;
}

.adj-value {
    display: inline-block;
    min-width: 36px;
    text-align: right;
    font-size: 0.8rem;
    color: #2563eb;
}

.adjustment input[type="checkbox"] {
    margin-right: 8px;
}

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

#zoomLevel {
    flex: 1;
    text-align: center;
    font-size: 0.9rem;
}

.panel-actions {
    display: flex;
    gap: 8px;
    margin-top: 10px;
}

input[type="range"] {
    accent-color: #2563eb;
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.45);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal[hidden] {
    display: none;
}

.modal-content {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 24px;
    min-width: 300px;
    max-width: 90%;
}

.modal-content h3 {
    margin-bottom: 16px;
    color: #111827;
}

.modal-content p {
    margin-bottom: 16px;
    color: #6b7280;
    font-size: 0.9rem;
}

.help-content {
    max-width: 520px;
}

.help-list {
    margin: 12px 0 16px;
    padding-left: 18px;
    color: #4b5563;
    font-size: 0.95rem;
    line-height: 1.6;
}

.help-list li + li {
    margin-top: 8px;
}

.help-note {
    color: #6b7280;
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.form-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

.form-row label {
    min-width: 80px;
    color: #6b7280;
    font-size: 0.9rem;
}

.form-row input[type="number"],
.form-row input[type="text"],
.form-row select {
    flex: 1;
    padding: 8px;
    background: #f8fafc;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    color: #111827;
    font-size: 0.9rem;
}

.form-row input:focus,
.form-row select:focus {
    outline: none;
    border-color: #2563eb;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 20px;
}

/* Cursor styles */
.canvas-wrapper.tool-pen { cursor: crosshair; }
.canvas-wrapper.tool-eraser { cursor: cell; }
.canvas-wrapper.tool-pan { cursor: grab; }
.canvas-wrapper.tool-pan:active { cursor: grabbing; }
.canvas-wrapper.tool-crop { cursor: crosshair; }
.canvas-wrapper.tool-text { cursor: text; }
.canvas-wrapper.tool-rect,
.canvas-wrapper.tool-circle,
.canvas-wrapper.tool-line,
.canvas-wrapper.tool-arrow { cursor: crosshair; }