* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Vazir', system-ui, sans-serif;
        }

        body {
            min-height: 100vh;
            background: linear-gradient(145deg, #0b1120 0%, #1a2744 100%);
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .app-container {
            background: rgba(255, 255, 255, 0.08);
            backdrop-filter: blur(12px);
            border-radius: 40px;
            padding: 25px 30px 30px 30px;
            box-shadow: 0 30px 60px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(255, 255, 255, 0.04);
            max-width: 1100px;
            width: 100%;
            transition: all 0.3s;
        }

        .header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            flex-wrap: wrap;
            gap: 10px;
        }

        .header h1 {
            font-size: 26px;
            font-weight: 700;
            background: linear-gradient(to right, #f7e05e, #f9b042);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: 1px;
        }

        .header h1 i {
            -webkit-text-fill-color: initial;
            color: #f9b042;
            margin-left: 8px;
        }

        .header .status-badge {
            background: rgba(255, 255, 255, 0.12);
            padding: 6px 18px;
            border-radius: 60px;
            color: #ccd9f0;
            font-size: 14px;
            border: 1px solid rgba(255, 255, 255, 0.06);
            backdrop-filter: blur(4px);
        }

        .toolbar-top {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            background: rgba(255, 255, 255, 0.06);
            padding: 12px 18px;
            border-radius: 60px;
            margin-bottom: 18px;
            border: 1px solid rgba(255, 255, 255, 0.05);
            justify-content: center;
        }

        .tool-btn {
            background: transparent;
            border: none;
            color: #b0c7e7;
            font-size: 20px;
            padding: 8px 14px;
            border-radius: 40px;
            cursor: pointer;
            transition: all 0.25s ease;
            display: flex;
            align-items: center;
            gap: 6px;
            font-weight: 500;
            font-size: 15px;
        }

        .tool-btn i {
            font-size: 18px;
        }

        .tool-btn:hover {
            background: rgba(255, 255, 255, 0.10);
            color: #fff;
            transform: translateY(-2px);
        }

        .tool-btn.active {
            background: linear-gradient(145deg, #f7e05e, #f9b042);
            color: #1a1f2e;
            box-shadow: 0 8px 20px rgba(249, 176, 66, 0.35);
        }

        .tool-btn.active i {
            color: #1a1f2e;
        }

        .separator {
            width: 1px;
            background: rgba(255, 255, 255, 0.15);
            margin: 0 6px;
        }

        .toolbar-bottom {
            display: flex;
            flex-wrap: wrap;
            gap: 20px 30px;
            align-items: center;
            justify-content: center;
            background: rgba(255, 255, 255, 0.05);
            padding: 12px 24px;
            border-radius: 60px;
            margin-bottom: 20px;
            border: 1px solid rgba(255, 255, 255, 0.04);
        }

        .control-group {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }

        .control-group label {
            color: #b0c7e7;
            font-size: 14px;
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .control-group label i {
            font-size: 16px;
        }

        .color-picker-wrapper {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .color-picker-wrapper input[type="color"] {
            width: 38px;
            height: 38px;
            border: 2px solid rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            background: none;
            cursor: pointer;
            padding: 2px;
            transition: 0.2s;
        }

        .color-picker-wrapper input[type="color"]:hover {
            transform: scale(1.05);
            border-color: #f9b042;
        }

        .color-picker-wrapper .color-label {
            color: #ccd9f0;
            font-size: 12px;
        }

        input[type="range"] {
            width: 100px;
            accent-color: #f9b042;
            background: transparent;
            cursor: pointer;
        }

        .range-value {
            color: #f0f4ff;
            font-weight: 600;
            min-width: 28px;
            text-align: center;
            font-size: 15px;
        }

        .action-btn {
            background: rgba(255, 255, 255, 0.07);
            border: none;
            color: #b0c7e7;
            padding: 8px 16px;
            border-radius: 40px;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            border: 1px solid rgba(255, 255, 255, 0.04);
        }

        .action-btn:hover {
            background: rgba(255, 255, 255, 0.14);
            color: #fff;
            transform: scale(1.03);
        }

        .action-btn.danger {
            color: #f78b8b;
        }

        .action-btn.danger:hover {
            background: rgba(247, 139, 139, 0.18);
        }

        .action-btn.success {
            color: #8bcb8b;
        }

        .action-btn.success:hover {
            background: rgba(139, 203, 139, 0.18);
        }

        .action-btn.undo-redo {
            color: #8bb3f0;
        }

        .action-btn.undo-redo:hover {
            background: rgba(139, 179, 240, 0.15);
        }

        .canvas-wrapper {
            position: relative;
            border-radius: 24px;
            overflow: hidden;
            box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.5), 0 10px 30px rgba(0, 0, 0, 0.4);
            border: 2px solid rgba(255, 255, 255, 0.06);
            background: #1a1f2e;
            touch-action: none;
        }

        #canvas {
            display: block;
            width: 100%;
            height: auto;
            background: #ffffff;
            cursor: crosshair;
            touch-action: none;
        }

        .footer {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 16px;
            color: #7a8aaa;
            font-size: 13px;
            flex-wrap: wrap;
            gap: 8px;
        }

        .footer .hint i {
            margin-left: 6px;
        }

        .footer .size-indicator {
            background: rgba(255, 255, 255, 0.06);
            padding: 4px 16px;
            border-radius: 40px;
            font-size: 13px;
        }

        @media (max-width: 720px) {
            .app-container {
                padding: 15px;
            }

            .toolbar-top {
                gap: 4px;
                padding: 10px 12px;
            }

            .tool-btn {
                font-size: 13px;
                padding: 6px 10px;
            }

            .tool-btn i {
                font-size: 15px;
            }

            .toolbar-bottom {
                gap: 12px;
                padding: 10px 16px;
            }

            input[type="range"] {
                width: 70px;
            }

            .header h1 {
                font-size: 20px;
            }
        }

        @media (max-width: 480px) {
            .tool-btn span {
                display: none;
            }

        }